mcs/class/referencesource/System.Workflow.Runtime/Tracking.cs

   1 using System;
   2 using System.Text;
   3 using System.Reflection;
   4 using System.ComponentModel;
   5 using System.Collections;
   6 using System.Collections.Generic;
   7 using System.Collections.Specialized;
   8 using System.Diagnostics;
   9 using System.Diagnostics.CodeAnalysis;
  10 using System.Xml;
  11 using System.Xml.XPath;
  12 using System.Xml.Schema;
  13 using System.IO;
  14 using System.Runtime.Serialization.Formatters.Binary;
  15 using System.Threading;
  16 using System.Timers;
  17 using System.Security.Permissions;
  18 using System.Security.Cryptography;
  19
  20 using System.Workflow.Runtime;
  21 using System.Workflow.ComponentModel;
  22 using System.Workflow.Runtime.Hosting;
  23 using System.Workflow.Runtime.Tracking;
  24
  25 namespace System.Workflow.Runtime
  26 {
  27     /// <summary>
  28     /// Creates TrackingListener instances
  29     /// </summary>
  30     internal class TrackingListenerFactory
  31     {
  32         private List<TrackingService> _services = null;
  33         private bool _initialized = false;
  34         private Dictionary<Guid, WeakReference> _listeners = new Dictionary<Guid, WeakReference>();
  35         private volatile object _listenerLock = new object();
  36
  37         private System.Timers.Timer _timer = null;
  38         private double _interval = 60000;
  39
  40         private TrackingProfileManager _profileManager = new TrackingProfileManager();
  41
  42         internal TrackingListenerFactory()
  43         {
  44         }
  45
  46         internal TrackingProfileManager TrackingProfileManager
  47         {
  48             get { return _profileManager; }
  49         }
  50         /// <summary>
  51         /// Must be called
  52         /// </summary>
  53         /// <param name="skedExec"></param>
  54         internal void Initialize(WorkflowRuntime runtime)
  55         {
  56             lock (this)
  57             {
  58                 _services = runtime.TrackingServices;
  59                 _profileManager.Initialize(runtime);
  60                 runtime.WorkflowExecutorInitializing += WorkflowExecutorInitializing;
  61
  62                 _timer = new System.Timers.Timer();
  63                 _timer.Interval = _interval;
  64                 _timer.AutoReset = false; // ensure that only one timer thread at a time
  65                 _timer.Elapsed += new ElapsedEventHandler(Cleanup);
  66                 _timer.Start();
  67
  68                 _initialized = true;
  69             }
  70         }
  71
  72         /// <summary>
  73         /// Clean up static state created in Initialize
  74         /// </summary>
  75         internal void Uninitialize(WorkflowRuntime runtime)
  76         {
  77             lock (this)
  78             {
  79                 _profileManager.Uninitialize();
  80                 runtime.WorkflowExecutorInitializing -= WorkflowExecutorInitializing;
  81                 _timer.Elapsed -= new ElapsedEventHandler(Cleanup);
  82                 _timer.Stop();
  83                 _services = null;
  84                 _initialized = false;
  85
  86                 _timer.Dispose();
  87                 _timer = null;
  88             }
  89         }
  90         /// <summary>
  91         /// Callback for associating tracking listeners to in memory instances.  Fires for new and loading instances.
  92         /// </summary>
  93         /// <param name="sender">WorkflowExecutor</param>
  94         /// <param name="e"></param>
  95         void WorkflowExecutorInitializing(object sender, WorkflowRuntime.WorkflowExecutorInitializingEventArgs e)
  96         {
  97             if (null == sender)
  98                 throw new ArgumentNullException("sender");
  99
 100             if (null == e)
 101                 throw new ArgumentNullException("e");
 102
 103             if (!typeof(WorkflowExecutor).IsInstanceOfType(sender))
 104                 throw new ArgumentException("sender");
 105
 106             WorkflowExecutor exec = (WorkflowExecutor)sender;
 107             //
 108             // Add an event to clean up the WeakRef entry
 109             exec.WorkflowExecutionEvent += new EventHandler<WorkflowExecutor.WorkflowExecutionEventArgs>(WorkflowExecutionEvent);
 110             TrackingCallingState trackingCallingState = exec.TrackingCallingState;
 111             TrackingListenerBroker listenerBroker = (TrackingListenerBroker)exec.RootActivity.GetValue(WorkflowExecutor.TrackingListenerBrokerProperty);
 112             if (listenerBroker != null)
 113             {
 114                 listenerBroker.ReplaceServices(exec.WorkflowRuntime.TrackingServiceReplacement);
 115             }
 116             TrackingListener listener = null;
 117             //
 118             // Check if we still have a weakref to the listener for this instance
 119             WeakReference weakref = null;
 120             if (e.Loading)
 121             {
 122                 bool found = false;
 123                 lock (_listenerLock)
 124                 {
 125                     found = _listeners.TryGetValue(exec.InstanceId, out weakref);
 126                 }
 127                 if (found)
 128                 {
 129                     try
 130                     {
 131                         //
 132                         // Instead of checking IsAlive take a ref to the Target
 133                         //  so that it isn't GC'd underneath us.
 134                         listener = weakref.Target as TrackingListener;
 135                     }
 136                     catch (InvalidOperationException)
 137                     {
 138                         //
 139                         // This seems weird but according to msdn
 140                         // accessing Target can throw ???
 141                         // Ignore because it's the same as a null target.
 142                     }
 143                 }
 144                 //
 145                 // If listener is null because we didn't find the wr in the cache
 146                 // or because the Target has been GC'd create a new listener
 147                 if (null != listener)
 148                 {
 149                     listener.Broker = listenerBroker;
 150                 }
 151                 else
 152                 {
 153                     Debug.Assert(null != listenerBroker, "TrackingListenerBroker should not be null during loading");
 154                     listener = GetTrackingListener(exec.WorkflowDefinition, exec, listenerBroker);
 155                     if (null != listener)
 156                     {
 157                         if (null != weakref)
 158                             weakref.Target = listener;
 159                         else
 160                         {
 161                             lock (_listenerLock)
 162                             {
 163                                 _listeners.Add(exec.ID, new WeakReference(listener));
 164                             }
 165                         }
 166                     }
 167                 }
 168             }
 169             else
 170             {
 171                 //
 172                 // New instance is being created
 173                 listener = GetTrackingListener(exec.WorkflowDefinition, exec);
 174
 175                 if (null != listener)
 176                 {
 177                     exec.RootActivity.SetValue(WorkflowExecutor.TrackingListenerBrokerProperty, listener.Broker);
 178                     lock (_listenerLock)
 179                     {
 180                         _listeners.Add(exec.ID, new WeakReference(listener));
 181                     }
 182                 }
 183                 else
 184                     exec.RootActivity.SetValue(WorkflowExecutor.TrackingListenerBrokerProperty, new TrackingListenerBroker());
 185             }
 186
 187             if (null != listener)
 188             {
 189                 exec.WorkflowExecutionEvent += new EventHandler<WorkflowExecutor.WorkflowExecutionEventArgs>(listener.WorkflowExecutionEvent);
 190             }
 191
 192         }
 193
 194         void WorkflowExecutionEvent(object sender, WorkflowExecutor.WorkflowExecutionEventArgs e)
 195         {
 196             switch (e.EventType)
 197             {
 198                 case WorkflowEventInternal.Aborted:
 199                 case WorkflowEventInternal.Completed:
 200                 case WorkflowEventInternal.Terminated:
 201                     //
 202                     // The instance is done - remove
 203                     // the WeakRef from our list
 204                     WorkflowExecutor exec = (WorkflowExecutor)sender;
 205                     lock (_listenerLock)
 206                     {
 207                         _listeners.Remove(exec.ID);
 208                     }
 209                     break;
 210                 default:
 211                     return;
 212             }
 213         }
 214
 215         void Cleanup(object sender, ElapsedEventArgs e)
 216         {
 217             List<Guid> _toRemove = new List<Guid>();
 218             if ((null != _listeners) || (_listeners.Count > 0))
 219             {
 220                 lock (_listenerLock)
 221                 {
 222                     foreach (KeyValuePair<Guid, WeakReference> kvp in _listeners)
 223                     {
 224                         if (null == kvp.Value.Target)
 225                             _toRemove.Add(kvp.Key);
 226                     }
 227                     if (_toRemove.Count > 0)
 228                     {
 229                         foreach (Guid g in _toRemove)
 230                             _listeners.Remove(g);
 231                     }
 232                 }
 233             }
 234
 235             lock (this)
 236             {
 237                 if (_timer != null)
 238                 {
 239                     _timer.Start();
 240                 }
 241             }
 242         }
 243
 244         /// <summary>
 245         /// Return a tracking listener for a new instance
 246         /// </summary>
 247         /// <param name="sked">SequentialWorkflow for which the tracking listener will be associated</param>
 248         /// <param name="skedExec">ScheduleExecutor for the schedule instance</param>
 249         /// <returns>New TrackingListener instance</returns>
 250         internal TrackingListener GetTrackingListener(Activity sked, WorkflowExecutor skedExec)
 251         {
 252             if (!_initialized)
 253                 Initialize(skedExec.WorkflowRuntime);
 254
 255             return GetListener(sked, skedExec, null);
 256         }
 257
 258         /// <summary>
 259         /// Return a tracking listener for an existing instance (normally used during loading)
 260         /// </summary>
 261         /// <param name="sked">SequentialWorkflow for which the tracking listener will be associated</param>
 262         /// <param name="skedExec">ScheduleExecutor for the schedule instance</param>
 263         /// <param name="broker">TrackingListenerBroker</param>
 264         /// <returns>New TrackingListener instance</returns>
 265         internal TrackingListener GetTrackingListener(Activity sked, WorkflowExecutor skedExec, TrackingListenerBroker broker)
 266         {
 267             if (!_initialized)
 268                 Initialize(skedExec.WorkflowRuntime);
 269
 270             if (null == broker)
 271             {
 272                 WorkflowTrace.Tracking.TraceEvent(TraceEventType.Error, 0, ExecutionStringManager.NullTrackingBroker);
 273                 return null;
 274             }
 275
 276             return GetListener(sked, skedExec, broker);
 277         }
 278
 279         private TrackingListener GetListenerFromWRCache(Guid instanceId)
 280         {
 281             WeakReference wr = null;
 282             TrackingListener listener = null;
 283             lock (_listenerLock)
 284             {
 285                 if (!_listeners.TryGetValue(instanceId, out wr))
 286                     throw new InvalidOperationException(string.Format(System.Globalization.CultureInfo.InvariantCulture, ExecutionStringManager.ListenerNotInCache, instanceId));
 287
 288                 listener = wr.Target as TrackingListener;
 289
 290                 if (null == listener)
 291                     throw new ObjectDisposedException(string.Format(System.Globalization.CultureInfo.InvariantCulture, ExecutionStringManager.ListenerNotInCacheDisposed, instanceId));
 292             }
 293
 294             return listener;
 295         }
 296
 297         internal void ReloadProfiles(WorkflowExecutor exec)
 298         {
 299             // Keep control events from other threads out
 300             using (new ServiceEnvironment(exec.RootActivity))
 301             {
 302                 using (exec.ExecutorLock.Enter())
 303                 {
 304                     // check if this is a valid in-memory instance
 305                     if (!exec.IsInstanceValid)
 306                         throw new InvalidOperationException(ExecutionStringManager.WorkflowNotValid);
 307
 308                     // suspend the instance
 309                     bool localSuspend = exec.Suspend(ExecutionStringManager.TrackingProfileUpdate);
 310                     try
 311                     {
 312                         //
 313                         // Get new profiles
 314                         TrackingListener listener = GetListenerFromWRCache(exec.InstanceId);
 315                         listener.ReloadProfiles(exec, exec.InstanceId);
 316                     }
 317                     finally
 318                     {
 319                         if (localSuspend)
 320                         {
 321                             // @undone: for now this will not return till the instance is done
 322                             // Once Kumar has fixed 4335, we can enable this.
 323                             exec.Resume();
 324                         }
 325                     }
 326                 }
 327             }
 328         }
 329
 330         internal void ReloadProfiles(WorkflowExecutor exec, Guid instanceId, ref TrackingListenerBroker broker, ref List<TrackingChannelWrapper> channels)
 331         {
 332             Type workflowType = exec.WorkflowDefinition.GetType();
 333             //
 334             // Ask every tracking service if they want to reload
 335             // even if they originally returned null for a profile
 336             foreach (TrackingService service in _services)
 337             {
 338                 TrackingProfile profile = null;
 339                 TrackingChannelWrapper w = null;
 340                 //
 341                 // Check if the service wants to reload a profile
 342                 if (service.TryReloadProfile(workflowType, instanceId, out profile))
 343                 {
 344                     bool found = false;
 345                     int i;
 346                     for (i = 0; i < channels.Count; i++)
 347                     {
 348                         if (service.GetType() == channels[i].TrackingServiceType)
 349                         {
 350                             w = channels[i];
 351                             found = true;
 352                             break;
 353                         }
 354                     }
 355                     //
 356                     // If we don't have a profile, remove what we had for this service type (if anything)
 357                     if (null == profile)
 358                     {
 359                         if (found)
 360                         {
 361                             broker.RemoveService(w.TrackingServiceType);
 362                             channels.RemoveAt(i);
 363                         }
 364                         continue;
 365                     }
 366                     //
 367                     // Parse the new profile - instance only, the cache is not involved
 368                     RTTrackingProfile rtp = new RTTrackingProfile(profile, exec.WorkflowDefinition, workflowType);
 369                     rtp.IsPrivate = true;
 370
 371                     if (!found)
 372                     {
 373                         //
 374                         // This is a new profile, create new channel, channelwrapper and broker item
 375                         List<string> activityCallPath = null;
 376                         Guid callerInstanceId = Guid.Empty;
 377                         TrackingCallingState trackingCallingState = exec.TrackingCallingState;
 378                         Debug.Assert((null != trackingCallingState), "WorkflowState is null");
 379                         IList<string> path = null;
 380                         Guid context = GetContext(exec.RootActivity), callerContext = Guid.Empty, callerParentContext = Guid.Empty;
 381                         //
 382                         // Use CallerActivityPathProxy to determine if this is an invoked instance
 383                         if (trackingCallingState != null)
 384                         {
 385                             path = trackingCallingState.CallerActivityPathProxy;
 386                             if ((null != path) && (path.Count > 0))
 387                             {
 388                                 activityCallPath = new List<string>(path);
 389
 390                                 Debug.Assert(Guid.Empty != trackingCallingState.CallerWorkflowInstanceId, "Instance has an ActivityCallPath but CallerInstanceId is empty");
 391                                 callerInstanceId = trackingCallingState.CallerWorkflowInstanceId;
 392
 393                                 callerContext = trackingCallingState.CallerContextGuid;
 394                                 callerParentContext = trackingCallingState.CallerParentContextGuid;
 395                             }
 396                         }
 397
 398                         TrackingParameters tp = new TrackingParameters(instanceId, workflowType, exec.WorkflowDefinition, activityCallPath, callerInstanceId, context, callerContext, callerParentContext);
 399                         TrackingChannel channel = service.GetTrackingChannel(tp);
 400
 401                         TrackingChannelWrapper wrapper = new TrackingChannelWrapper(channel, service.GetType(), workflowType, rtp);
 402                         channels.Add(wrapper);
 403
 404                         Type t = service.GetType();
 405                         broker.AddService(t, rtp.Version);
 406                         broker.MakeProfileInstance(t);
 407                     }
 408                     else
 409                     {
 410                         //
 411                         // Don't need to call MakeProfilePrivate on the wrapper
 412                         // because we've already marked it as private and we already
 413                         // have a private copy of it.
 414                         //w.MakeProfilePrivate( exec );
 415                         w.SetTrackingProfile(rtp);
 416                         broker.MakeProfileInstance(w.TrackingServiceType);
 417                     }
 418                 }
 419             }
 420         }
 421
 422         internal Guid GetContext(Activity activity)
 423         {
 424             return ((ActivityExecutionContextInfo)ContextActivityUtils.ContextActivity(activity).GetValue(Activity.ActivityExecutionContextInfoProperty)).ContextGuid;
 425         }
 426
 427         private TrackingListener GetListener(Activity sked, WorkflowExecutor skedExec, TrackingListenerBroker broker)
 428         {
 429             if ((null == sked) || (null == skedExec))
 430             {
 431                 WorkflowTrace.Tracking.TraceEvent(TraceEventType.Error, 0, ExecutionStringManager.NullParameters);
 432                 return null;
 433             }
 434
 435             if ((null == _services) || (_services.Count <= 0))
 436                 return null;
 437
 438             bool load = (null != broker);
 439
 440             List<TrackingChannelWrapper> channels = GetChannels(sked, skedExec, skedExec.InstanceId, sked.GetType(), ref broker);
 441
 442             if ((null == channels) || (0 == channels.Count))
 443                 return null;
 444
 445             return new TrackingListener(this, sked, skedExec, channels, broker, load);
 446         }
 447
 448         private List<TrackingChannelWrapper> GetChannels(Activity schedule, WorkflowExecutor exec, Guid instanceID, Type workflowType, ref TrackingListenerBroker broker)
 449         {
 450             if (null == _services)
 451                 return null;
 452
 453             bool initBroker = false;
 454             if (null == broker)
 455             {
 456                 broker = new TrackingListenerBroker();
 457                 initBroker = true;
 458             }
 459
 460             List<TrackingChannelWrapper> channels = new List<TrackingChannelWrapper>();
 461
 462             List<string> activityCallPath = null;
 463             Guid callerInstanceId = Guid.Empty;
 464             Guid context = GetContext(exec.RootActivity), callerContext = Guid.Empty, callerParentContext = Guid.Empty;
 465
 466             Debug.Assert(exec is WorkflowExecutor, "Executor is not WorkflowExecutor");
 467             TrackingCallingState trackingCallingState = exec.TrackingCallingState;
 468             TrackingListenerBroker trackingListenerBroker = (TrackingListenerBroker)exec.RootActivity.GetValue(WorkflowExecutor.TrackingListenerBrokerProperty);
 469             IList<string> path = trackingCallingState != null ? trackingCallingState.CallerActivityPathProxy : null;
 470             //
 471             // Use CallerActivityPathProxy to determine if this is an invoked instance
 472             if ((null != path) && (path.Count > 0))
 473             {
 474                 activityCallPath = new List<string>(path);
 475
 476                 Debug.Assert(Guid.Empty != trackingCallingState.CallerWorkflowInstanceId, "Instance has an ActivityCallPath but CallerInstanceId is empty");
 477                 callerInstanceId = trackingCallingState.CallerWorkflowInstanceId;
 478
 479                 callerContext = trackingCallingState.CallerContextGuid;
 480                 callerParentContext = trackingCallingState.CallerParentContextGuid;
 481             }
 482
 483             TrackingParameters parameters = new TrackingParameters(instanceID, workflowType, exec.WorkflowDefinition, activityCallPath, callerInstanceId, context, callerContext, callerParentContext);
 484
 485             for (int i = 0; i < _services.Count; i++)
 486             {
 487                 TrackingChannel channel = null;
 488                 Type serviceType = _services[i].GetType();
 489
 490                 //
 491                 // See if the service has a profile for this schedule type
 492                 // If not we don't do any tracking for the service
 493                 //
 494                 RTTrackingProfile profile = null;
 495
 496                 //
 497                 // If we've created the broker get the current version of the profile
 498                 if (initBroker)
 499                 {
 500                     profile = _profileManager.GetProfile(_services[i], schedule);
 501
 502                     if (null == profile)
 503                         continue;
 504
 505                     broker.AddService(serviceType, profile.Version);
 506                 }
 507                 else
 508                 {
 509                     //
 510                     // Only reload the services that are in the broker
 511                     // If services that weren't originally associated to an instance
 512                     // wish to join that instance they should call ReloadTrackingProfiles
 513                     if (!broker.ContainsService(serviceType))
 514                         continue;
 515
 516                     if (broker.IsProfileInstance(serviceType))
 517                     {
 518                         profile = _profileManager.GetProfile(_services[i], schedule, instanceID);
 519
 520                         if (null == profile)
 521                             throw new InvalidOperationException(ExecutionStringManager.MissingProfileForService + serviceType.ToString());
 522
 523                         profile.IsPrivate = true;
 524                     }
 525                     else
 526                     {
 527                         Version versionId;
 528                         if (broker.TryGetProfileVersionId(serviceType, out versionId))
 529                         {
 530                             profile = _profileManager.GetProfile(_services[i], schedule, versionId);
 531
 532                             if (null == profile)
 533                                 throw new InvalidOperationException(ExecutionStringManager.MissingProfileForService + serviceType.ToString() + ExecutionStringManager.MissingProfileForVersion + versionId.ToString());
 534                             //
 535                             // If the profile is marked as private clone the instance we got from the cache
 536                             // The cloned instance is marked as private during the cloning
 537                             if (broker.IsProfilePrivate(serviceType))
 538                             {
 539                                 profile = profile.Clone();
 540                                 profile.IsPrivate = true;
 541                             }
 542                         }
 543                         else
 544                             continue;
 545                     }
 546                 }
 547
 548                 //
 549                 // If profile is not null get a channel
 550                 channel = _services[i].GetTrackingChannel(parameters);
 551
 552                 if (null == channel)
 553                     throw new InvalidOperationException(ExecutionStringManager.NullChannel);
 554
 555                 channels.Add(new TrackingChannelWrapper(channel, _services[i].GetType(), workflowType, profile));
 556             }
 557
 558             return channels;
 559         }
 560     }
 561
 562     /// <summary>
 563     /// Handles subscribing to status change events and receiving event notifications.
 564     /// </summary>
 565     internal class TrackingListener
 566     {
 567         private List<TrackingChannelWrapper> _channels = null;
 568         private TrackingListenerBroker _broker = null;
 569         private TrackingListenerFactory _factory = null;
 570
 571         protected TrackingListener()
 572         {
 573         }
 574
 575         internal TrackingListener(TrackingListenerFactory factory, Activity sked, WorkflowExecutor exec, List<TrackingChannelWrapper> channels, TrackingListenerBroker broker, bool load)
 576         {
 577             if ((null == sked) || (null == broker))
 578             {
 579                 WorkflowTrace.Tracking.TraceEvent(TraceEventType.Error, 0, ExecutionStringManager.NullParameters);
 580                 return;
 581             }
 582             _factory = factory;
 583             _channels = channels;
 584             //
 585             // Keep a reference to the broker so that we can hand it out when adding subscriptions
 586             _broker = broker;
 587             //
 588             // Give the broker our reference so that it can call us back on behalf of subscriptions
 589             _broker.TrackingListener = this;
 590         }
 591
 592         internal TrackingListenerBroker Broker
 593         {
 594             get { return _broker; }
 595             set { _broker = value; }
 596         }
 597
 598         internal void ReloadProfiles(WorkflowExecutor exec, Guid instanceId)
 599         {
 600             //
 601             // Ask the factory to redo the channels and broker
 602             _factory.ReloadProfiles(exec, instanceId, ref _broker, ref _channels);
 603         }
 604
 605
 606         #region Event Handlers
 607
 608         internal void ActivityStatusChange(object sender, WorkflowExecutor.ActivityStatusChangeEventArgs e)
 609         {
 610             WorkflowTrace.Tracking.TraceInformation("TrackingListener::ActivityStatusChange - Received Activity Status Change Event for activity {0}", e.Activity.QualifiedName);
 611
 612             if (null == sender)
 613                 throw new ArgumentNullException("sender");
 614
 615             if (!typeof(WorkflowExecutor).IsInstanceOfType(sender))
 616                 throw new ArgumentException("sender");
 617
 618             if (null == e)
 619                 throw new ArgumentNullException("e");
 620
 621             WorkflowExecutor exec = (WorkflowExecutor)sender;
 622
 623             if ((null == _channels) || (_channels.Count <= 0))
 624             {
 625                 WorkflowTrace.Tracking.TraceEvent(TraceEventType.Error, 0, ExecutionStringManager.NoChannels);
 626                 return;
 627             }
 628
 629             Activity activity = e.Activity;
 630
 631             if (!SubscriptionRequired(activity, exec))
 632                 return;
 633             //
 634             // Get the shared data that is the same for each tracking channel that gets a record
 635             Guid parentContextGuid = Guid.Empty, contextGuid = Guid.Empty;
 636             GetContext(activity, exec, out contextGuid, out parentContextGuid);
 637
 638             DateTime dt = DateTime.UtcNow;
 639             int eventOrderId = _broker.GetNextEventOrderId();
 640
 641             foreach (TrackingChannelWrapper wrapper in _channels)
 642             {
 643                 //
 644                 // Create a record for each tracking channel
 645                 // Each channel gets a distinct record because extract data will almost always be different.
 646                 ActivityTrackingRecord record = new ActivityTrackingRecord(activity.GetType(), activity.QualifiedName, contextGuid, parentContextGuid, activity.ExecutionStatus, dt, eventOrderId, null);
 647
 648                 bool extracted = wrapper.GetTrackingProfile(exec).TryTrackActivityEvent(activity, activity.ExecutionStatus, exec, record);
 649                 //
 650                 // Only send the record to the channel if the profile indicates that it is interested
 651                 // This doesn't mean that the Body will always have data in it,
 652                 // it may be an empty extraction (just header info)
 653                 if (extracted)
 654                     wrapper.TrackingChannel.Send(record);
 655             }
 656         }
 657
 658         internal void UserTrackPoint(object sender, WorkflowExecutor.UserTrackPointEventArgs e)
 659         {
 660             if (!typeof(WorkflowExecutor).IsInstanceOfType(sender))
 661                 throw new ArgumentException("sender is not WorkflowExecutor");
 662
 663             WorkflowExecutor exec = (WorkflowExecutor)sender;
 664             Activity activity = e.Activity;
 665
 666             DateTime dt = DateTime.UtcNow;
 667             int eventOrderId = _broker.GetNextEventOrderId();
 668
 669             Guid parentContextGuid, contextGuid;
 670             GetContext(activity, exec, out contextGuid, out parentContextGuid);
 671
 672             foreach (TrackingChannelWrapper wrapper in _channels)
 673             {
 674                 UserTrackingRecord record = new UserTrackingRecord(activity.GetType(), activity.QualifiedName, contextGuid, parentContextGuid, dt, eventOrderId, e.Key, e.Args);
 675
 676                 if (wrapper.GetTrackingProfile(exec).TryTrackUserEvent(activity, e.Key, e.Args, exec, record))
 677                     wrapper.TrackingChannel.Send(record);
 678             }
 679         }
 680
 681         internal void WorkflowExecutionEvent(object sender, WorkflowExecutor.WorkflowExecutionEventArgs e)
 682         {
 683             if (null == sender)
 684                 throw new ArgumentNullException("sender");
 685
 686             WorkflowExecutor exec = sender as WorkflowExecutor;
 687             if (null == exec)
 688                 throw new ArgumentException(ExecutionStringManager.InvalidSenderWorkflowExecutor);
 689             //
 690             // Many events are mapped "forward" and sent to tracking services
 691             // (Persisting->Persisted, SchedulerEmpty->Idle)
 692             // This is so that a batch is always available when a tracking service gets an event.
 693             // Without this tracking data could be inconsistent with the state of the instance.
 694             switch (e.EventType)
 695             {
 696                 case WorkflowEventInternal.Creating:
 697                     NotifyChannels(TrackingWorkflowEvent.Created, e, exec);
 698                     return;
 699                 case WorkflowEventInternal.Starting:
 700                     NotifyChannels(TrackingWorkflowEvent.Started, e, exec);
 701                     return;
 702                 case WorkflowEventInternal.Suspending:
 703                     NotifyChannels(TrackingWorkflowEvent.Suspended, e, exec);
 704                     return;
 705                 case WorkflowEventInternal.Resuming:
 706                     NotifyChannels(TrackingWorkflowEvent.Resumed, e, exec);
 707                     return;
 708                 case WorkflowEventInternal.Persisting:
 709                     NotifyChannels(TrackingWorkflowEvent.Persisted, e, exec);
 710                     return;
 711                 case WorkflowEventInternal.Unloading:
 712                     NotifyChannels(TrackingWorkflowEvent.Unloaded, e, exec);
 713                     return;
 714                 case WorkflowEventInternal.Loading:
 715                     NotifyChannels(TrackingWorkflowEvent.Loaded, e, exec);
 716                     return;
 717                 case WorkflowEventInternal.Completing:
 718                     NotifyChannels(TrackingWorkflowEvent.Completed, e, exec);
 719                     NotifyChannelsOfCompletionOrTermination();
 720                     return;
 721                 case WorkflowEventInternal.Aborting:
 722                     NotifyChannels(TrackingWorkflowEvent.Aborted, e, exec);
 723                     return;
 724                 case WorkflowEventInternal.Terminating:
 725                     NotifyChannels(TrackingWorkflowEvent.Terminated, e, exec);
 726                     NotifyChannelsOfCompletionOrTermination();
 727                     return;
 728                 case WorkflowEventInternal.Exception:
 729                     NotifyChannels(TrackingWorkflowEvent.Exception, e, exec);
 730                     return;
 731                 case WorkflowEventInternal.SchedulerEmpty:
 732                     NotifyChannels(TrackingWorkflowEvent.Idle, e, exec);
 733                     return;
 734                 case WorkflowEventInternal.UserTrackPoint:
 735                     UserTrackPoint(exec, (WorkflowExecutor.UserTrackPointEventArgs)e);
 736                     return;
 737                 case WorkflowEventInternal.ActivityStatusChange:
 738                     ActivityStatusChange(exec, (WorkflowExecutor.ActivityStatusChangeEventArgs)e);
 739                     return;
 740                 case WorkflowEventInternal.DynamicChangeBegin:
 741                     DynamicUpdateBegin(exec, (WorkflowExecutor.DynamicUpdateEventArgs)e);
 742                     return;
 743                 case WorkflowEventInternal.DynamicChangeRollback:
 744                     DynamicUpdateRollback(exec, (WorkflowExecutor.DynamicUpdateEventArgs)e);
 745                     return;
 746                 case WorkflowEventInternal.DynamicChangeCommit:
 747                     DynamicUpdateCommit(exec, (WorkflowExecutor.DynamicUpdateEventArgs)e);
 748                     return;
 749                 default:
 750                     return;
 751             }
 752         }
 753
 754         internal void DynamicUpdateBegin(object sender, WorkflowExecutor.DynamicUpdateEventArgs e)
 755         {
 756             if (null == sender)
 757                 throw new ArgumentNullException("sender");
 758
 759             if (!typeof(WorkflowExecutor).IsInstanceOfType(sender))
 760                 throw new ArgumentException("sender");
 761
 762             WorkflowExecutor exec = (WorkflowExecutor)sender;
 763             //
 764             // WorkflowChangeEventArgs may be null or the WorkflowChanges may be null or empty
 765             // If so there's no work to do here
 766             if (null == e.ChangeActions)
 767                 return;
 768             //
 769             // Clone the profiles to create instance specific copies (if they aren't already)
 770             MakeProfilesPrivate(exec);
 771             //
 772             // Give the profiles the changes.  At this point we are in a volatile state.
 773             // Profiles must act as if the changes will succeed but roll back any internal changes if they do not.
 774             foreach (TrackingChannelWrapper channel in _channels)
 775             {
 776                 channel.GetTrackingProfile(exec).WorkflowChangeBegin(e.ChangeActions);
 777             }
 778         }
 779
 780         internal void DynamicUpdateRollback(object sender, WorkflowExecutor.DynamicUpdateEventArgs e)
 781         {
 782             if (null == sender)
 783                 throw new ArgumentNullException("sender");
 784
 785             if (!typeof(WorkflowExecutor).IsInstanceOfType(sender))
 786                 throw new ArgumentException("sender");
 787
 788             WorkflowExecutor exec = (WorkflowExecutor)sender;
 789
 790             foreach (TrackingChannelWrapper channel in _channels)
 791             {
 792                 channel.GetTrackingProfile(exec).WorkflowChangeRollback();
 793             }
 794         }
 795
 796         internal void DynamicUpdateCommit(object sender, WorkflowExecutor.DynamicUpdateEventArgs e)
 797         {
 798             if (null == sender)
 799                 throw new ArgumentNullException("sender");
 800
 801             if (!typeof(WorkflowExecutor).IsInstanceOfType(sender))
 802                 throw new ArgumentException("sender");
 803
 804             WorkflowExecutor exec = (WorkflowExecutor)sender;
 805
 806             DateTime dt = DateTime.UtcNow;
 807             foreach (TrackingChannelWrapper channel in _channels)
 808             {
 809                 channel.GetTrackingProfile(exec).WorkflowChangeCommit();
 810             }
 811             //
 812             // Notify tracking channels of changes
 813             int eventOrderId = _broker.GetNextEventOrderId();
 814
 815             foreach (TrackingChannelWrapper wrapper in _channels)
 816             {
 817                 WorkflowTrackingRecord rec = new WorkflowTrackingRecord(TrackingWorkflowEvent.Changed, dt, eventOrderId, new TrackingWorkflowChangedEventArgs(e.ChangeActions, exec.WorkflowDefinition));
 818                 if (wrapper.GetTrackingProfile(exec).TryTrackInstanceEvent(TrackingWorkflowEvent.Changed, rec))
 819                     wrapper.TrackingChannel.Send(rec);
 820             }
 821         }
 822
 823         #endregion Event Handlers
 824
 825         #region Private Methods
 826
 827         private void NotifyChannels(TrackingWorkflowEvent evt, WorkflowExecutor.WorkflowExecutionEventArgs e, WorkflowExecutor exec)
 828         {
 829             DateTime dt = DateTime.UtcNow;
 830             int eventOrderId = _broker.GetNextEventOrderId();
 831
 832             foreach (TrackingChannelWrapper wrapper in _channels)
 833             {
 834                 EventArgs args = null;
 835                 switch (evt)
 836                 {
 837                     case TrackingWorkflowEvent.Suspended:
 838                         args = new TrackingWorkflowSuspendedEventArgs(((WorkflowExecutor.WorkflowExecutionSuspendingEventArgs)e).Error);
 839                         break;
 840                     case TrackingWorkflowEvent.Terminated:
 841                         WorkflowExecutor.WorkflowExecutionTerminatingEventArgs wtea = (WorkflowExecutor.WorkflowExecutionTerminatingEventArgs)e;
 842                         if (null != wtea.Exception)
 843                             args = new TrackingWorkflowTerminatedEventArgs(wtea.Exception);
 844                         else
 845                             args = new TrackingWorkflowTerminatedEventArgs(wtea.Error);
 846                         break;
 847                     case TrackingWorkflowEvent.Exception:
 848                         WorkflowExecutor.WorkflowExecutionExceptionEventArgs weea = (WorkflowExecutor.WorkflowExecutionExceptionEventArgs)e;
 849                         args = new TrackingWorkflowExceptionEventArgs(weea.Exception, weea.CurrentPath, weea.OriginalPath, weea.ContextGuid, weea.ParentContextGuid);
 850                         break;
 851                 }
 852                 WorkflowTrackingRecord rec = new WorkflowTrackingRecord(evt, dt, eventOrderId, args);
 853                 if (wrapper.GetTrackingProfile(exec).TryTrackInstanceEvent(evt, rec))
 854                     wrapper.TrackingChannel.Send(rec);
 855             }
 856         }
 857
 858         private void NotifyChannelsOfCompletionOrTermination()
 859         {
 860             foreach (TrackingChannelWrapper wrapper in _channels)
 861                 wrapper.TrackingChannel.InstanceCompletedOrTerminated();
 862         }
 863
 864         private void GetContext(Activity activity, WorkflowExecutor exec, out Guid contextGuid, out Guid parentContextGuid)
 865         {
 866             contextGuid = _factory.GetContext(activity);
 867
 868             if (null != activity.Parent)
 869                 parentContextGuid = _factory.GetContext(activity.Parent);
 870             else
 871                 parentContextGuid = contextGuid;
 872
 873             Debug.Assert(contextGuid != Guid.Empty, "TrackingContext is empty");
 874             Debug.Assert(parentContextGuid != Guid.Empty, "Parent TrackingContext is empty");
 875         }
 876
 877         /// <summary>
 878         /// Clone all profiles to create private versions in order to hold subscriptions for dynamic changes
 879         /// </summary>
 880         private void MakeProfilesPrivate(WorkflowExecutor exec)
 881         {
 882             foreach (TrackingChannelWrapper channel in _channels)
 883             {
 884                 channel.MakeProfilePrivate(exec);
 885                 _broker.MakeProfilePrivate(channel.TrackingServiceType);
 886             }
 887         }
 888         /// <summary>
 889         /// Determine if subscriptions are needed
 890         /// </summary>
 891         /// <param name="activity">Activity for which to check subscription needs</param>
 892         /// <returns></returns>
 893         private bool SubscriptionRequired(Activity activity, WorkflowExecutor exec)
 894         {
 895             //
 896             // Give each channel a chance to prep itself
 897             bool needed = false;
 898
 899             foreach (TrackingChannelWrapper channel in _channels)
 900             {
 901                 if ((channel.GetTrackingProfile(exec).ActivitySubscriptionNeeded(activity)) && (!needed))
 902                     needed = true;
 903             }
 904
 905             return needed;
 906         }
 907
 908         #endregion
 909     }
 910
 911     /// <summary>
 912     /// This is a lightweight class that is serialized so that the TrackingListener doesn't have to be.
 913     /// Every subscription that the listener adds holds a reference to this class.
 914     /// When an instance is loaded the broker is given to the listener factory and the listener factory
 915     /// gives the broker the new listener.  This saves us from having to persist the listener itself which
 916     /// means that while we do need to persist a list of service types and their profile version we don't
 917     /// have to persist the channels themselves (and we can't control how heavy channels get as they are host defined).
 918     /// </summary>
 919     [Serializable]
 920     internal class TrackingListenerBroker : System.Runtime.Serialization.ISerializable
 921     {
 922         [NonSerialized]
 923         private TrackingListener _listener = null;
 924         private int _eventOrderId = 0;
 925         private Dictionary<Guid, ServiceProfileContainer> _services = new Dictionary<Guid, ServiceProfileContainer>();
 926
 927         internal TrackingListenerBroker()
 928         {
 929         }
 930
 931         internal TrackingListenerBroker(TrackingListener listener)
 932         {
 933             _listener = listener;
 934         }
 935
 936         internal TrackingListener TrackingListener
 937         {
 938             //
 939             // FxCops minbar complains because this isn't used.
 940             // The Setter is required; seems weird not to have a getter.
 941             //get { return _listener; }
 942             set { _listener = value; }
 943         }
 944
 945         internal bool ContainsService(Type trackingServiceType)
 946         {
 947             return _services.ContainsKey(HashHelper.HashServiceType(trackingServiceType));
 948         }
 949
 950         internal void AddService(Type trackingServiceType, Version profileVersionId)
 951         {
 952             _services.Add(HashHelper.HashServiceType(trackingServiceType), new ServiceProfileContainer(profileVersionId));
 953         }
 954
 955         internal void ReplaceServices(Dictionary<string, Type> replacements)
 956         {
 957             if (replacements != null && replacements.Count > 0)
 958             {
 959                 ServiceProfileContainer item;
 960                 foreach (KeyValuePair<string, Type> replacement in replacements)
 961                 {
 962                     Guid previous = HashHelper.HashServiceType(replacement.Key);
 963                     if (_services.TryGetValue(previous, out item))
 964                     {
 965                         _services.Remove(previous);
 966                         Guid current = HashHelper.HashServiceType(replacement.Value);
 967                         if (!_services.ContainsKey(current))
 968                         {
 969                             _services.Add(current, item);
 970                         }
 971                     }
 972                 }
 973             }
 974         }
 975
 976         internal void RemoveService(Type trackingServiceType)
 977         {
 978             _services.Remove(HashHelper.HashServiceType(trackingServiceType));
 979         }
 980
 981         internal bool TryGetProfileVersionId(Type trackingServiceType, out Version profileVersionId)
 982         {
 983             profileVersionId = new Version(0, 0);
 984
 985             ServiceProfileContainer service = null;
 986             if (_services.TryGetValue(HashHelper.HashServiceType(trackingServiceType), out service))
 987             {
 988                 profileVersionId = service.ProfileVersionId;
 989                 return true;
 990             }
 991             return false;
 992         }
 993
 994         internal void MakeProfilePrivate(Type trackingServiceType)
 995         {
 996             ServiceProfileContainer service = null;
 997             if (!_services.TryGetValue(HashHelper.HashServiceType(trackingServiceType), out service))
 998                 throw new ArgumentException(ExecutionStringManager.InvalidTrackingService);
 999
1000             service.IsPrivate = true;
1001         }
1002
1003         internal bool IsProfilePrivate(Type trackingServiceType)
1004         {
1005             ServiceProfileContainer service = null;
1006             if (!_services.TryGetValue(HashHelper.HashServiceType(trackingServiceType), out service))
1007                 throw new ArgumentException(ExecutionStringManager.InvalidTrackingService);
1008
1009             return service.IsPrivate;
1010         }
1011
1012         internal void MakeProfileInstance(Type trackingServiceType)
1013         {
1014             ServiceProfileContainer service = null;
1015             if (!_services.TryGetValue(HashHelper.HashServiceType(trackingServiceType), out service))
1016                 throw new ArgumentException(ExecutionStringManager.InvalidTrackingService);
1017             //
1018             // Can't be instance without being private
1019             service.IsPrivate = true;
1020             service.IsInstance = true;
1021         }
1022
1023         internal bool IsProfileInstance(Type trackingServiceType)
1024         {
1025             ServiceProfileContainer service = null;
1026             if (!_services.TryGetValue(HashHelper.HashServiceType(trackingServiceType), out service))
1027                 throw new ArgumentException(ExecutionStringManager.InvalidTrackingService);
1028
1029             return service.IsInstance;
1030         }
1031
1032         internal int GetNextEventOrderId()
1033         {
1034             checked
1035             {
1036                 return ++_eventOrderId;
1037             }
1038         }
1039
1040         [Serializable]
1041         internal class ServiceProfileContainer
1042         {
1043             Version _profileVersionId = new Version(0, 0);
1044             bool _isPrivate = false;
1045             bool _isInstance = false;
1046
1047             protected ServiceProfileContainer() { }
1048
1049             internal ServiceProfileContainer(Version profileVersionId)
1050             {
1051                 _profileVersionId = profileVersionId;
1052             }
1053
1054             internal Version ProfileVersionId
1055             {
1056                 get { return _profileVersionId; }
1057             }
1058
1059             internal bool IsPrivate
1060             {
1061                 get { return _isPrivate; }
1062                 set { _isPrivate = value; }
1063             }
1064
1065             internal bool IsInstance
1066             {
1067                 get { return _isInstance; }
1068                 set { _isInstance = value; }
1069             }
1070         }
1071
1072         #region ISerializable Members
1073
1074         [SecurityPermissionAttribute(SecurityAction.Demand, SerializationFormatter = true)]
1075         public void GetObjectData(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context)
1076         {
1077             info.AddValue("eventOrderId", this._eventOrderId);
1078             info.AddValue("services", this._services.Count == 0 ? null : this._services);
1079         }
1080         private TrackingListenerBroker(System.Runtime.Serialization.SerializationInfo info, System.Runtime.Serialization.StreamingContext context)
1081         {
1082             this._eventOrderId = info.GetInt32("eventOrderId");
1083             this._services = (Dictionary<Guid, ServiceProfileContainer>)info.GetValue("services", typeof(Dictionary<Guid, ServiceProfileContainer>));
1084             if (this._services == null)
1085                 this._services = new Dictionary<Guid, ServiceProfileContainer>();
1086         }
1087
1088         #endregion
1089     }
1090
1091     /// <summary>
1092     /// Manages profile requests, caching profiles and creating RTTrackingProfile instances.
1093     /// </summary>
1094     internal class TrackingProfileManager
1095     {
1096         //
1097         // This is a dictionary keyed by tracking service type
1098         // that returns a dictionary that is key by schedule type
1099         // that returns a Set of profile versions for that schedule type
1100         // The set is constrained by VersionId
1101         private Dictionary<Type, Dictionary<Type, ProfileList>> _cacheLookup;
1102         //
1103         // Protects _cacheLookup
1104         private object _cacheLock = new object();
1105         //
1106         // Values assigned in Initialize
1107         private bool _init = false;
1108         private List<TrackingService> _services = null;
1109         private WorkflowRuntime _runtime = null;
1110
1111         internal TrackingProfileManager()
1112         {
1113         }
1114         /// <summary>
1115         /// Clears all entries from the cache by reinitializing the member
1116         /// </summary>
1117         public static void ClearCache()
1118         {
1119             WorkflowRuntime.ClearTrackingProfileCache();
1120         }
1121
1122         internal void ClearCacheImpl()
1123         {
1124             lock (_cacheLock)
1125             {
1126                 _cacheLookup = new Dictionary<Type, Dictionary<Type, ProfileList>>();
1127             }
1128         }
1129         /// <summary>
1130         /// Create static state
1131         /// </summary>
1132         /// <param name="runtime"></param>
1133         internal void Initialize(WorkflowRuntime runtime)
1134         {
1135             lock (_cacheLock)
1136             {
1137                 if (null == runtime)
1138                     throw new ArgumentException(ExecutionStringManager.NullEngine);
1139
1140                 _runtime = runtime;
1141                 //
1142                 // Initialize the cache
1143                 // Do this every time the runtime starts/stops to make life easier
1144                 // for IProfileNotification tracking services that might have updated
1145                 // profiles while we were stopped - we'll go get new versions since nothing is cached
1146                 // without them having to fire updated events.
1147                 _cacheLookup = new Dictionary<Type, Dictionary<Type, ProfileList>>();
1148                 if (null != runtime.TrackingServices)
1149                 {
1150                     _services = runtime.TrackingServices;
1151                     foreach (TrackingService service in _services)
1152                     {
1153                         if (service is IProfileNotification)
1154                         {
1155                             ((IProfileNotification)service).ProfileUpdated += new EventHandler<ProfileUpdatedEventArgs>(ProfileUpdated);
1156                             ((IProfileNotification)service).ProfileRemoved += new EventHandler<ProfileRemovedEventArgs>(ProfileRemoved);
1157                         }
1158                     }
1159                 }
1160                 _init = true;
1161             }
1162         }
1163         /// <summary>
1164         /// Clean up static state
1165         /// </summary>
1166         internal void Uninitialize()
1167         {
1168             lock (_cacheLock)
1169             {
1170                 if (null != _runtime)
1171                 {
1172                     foreach (TrackingService service in _services)
1173                     {
1174                         if (service is IProfileNotification)
1175                         {
1176                             ((IProfileNotification)service).ProfileUpdated -= new EventHandler<ProfileUpdatedEventArgs>(ProfileUpdated);
1177                             ((IProfileNotification)service).ProfileRemoved -= new EventHandler<ProfileRemovedEventArgs>(ProfileRemoved);
1178                         }
1179                     }
1180                 }
1181                 _runtime = null;
1182                 _services = null;
1183                 _init = false;
1184             }
1185         }
1186         /// <summary>
1187         /// Retrieves the current version of a profile from the specified service
1188         /// </summary>
1189         internal RTTrackingProfile GetProfile(TrackingService service, Activity schedule)
1190         {
1191             if (!_init)
1192                 throw new ApplicationException(ExecutionStringManager.TrackingProfileManagerNotInitialized);
1193
1194             if ((null == service) || (null == schedule))
1195             {
1196                 WorkflowTrace.Tracking.TraceEvent(TraceEventType.Error, 0, ExecutionStringManager.NullParameters);
1197                 return null;
1198             }
1199
1200             Type workflowType = schedule.GetType();
1201             RTTrackingProfile tp = null;
1202             if (service is IProfileNotification)
1203             {
1204                 //
1205                 // If we found the profile in the cache return it, it may be null, this is OK
1206                 // (no profile for this service type/schedule type combination)
1207                 if (TryGetFromCache(service.GetType(), workflowType, out tp))
1208                     return tp;
1209             }
1210             //
1211             // Either we don't have anything in the cache for this schedule/service combination
1212             // or this is a base TrackingService that doesn't notify of profile updates
1213             // Get the profile from the service
1214             TrackingProfile profile = null;
1215
1216             if (!service.TryGetProfile(workflowType, out profile))
1217             {
1218                 //
1219                 // No profile for this schedule from this service
1220                 // RemoveProfile will just mark this service/schedule as not currently having a profile in the cache
1221                 RemoveProfile(workflowType, service.GetType());
1222                 return null;
1223             }
1224             //
1225             // Check the cache to see if we already have this version
1226             // For TrackingService types this is necessary.
1227             // For IProfileNotification types this is a bit redundant
1228             // but another threadcould have inserted the profile into the cache
1229             // so check again before acquiring the writer lock
1230             if (TryGetFromCache(service.GetType(), workflowType, profile.Version, out tp))
1231                 return tp;
1232             //
1233             // No profile, create it
1234             string xaml = schedule.GetValue(Activity.WorkflowXamlMarkupProperty) as string;
1235             if (null != xaml && xaml.Length > 0)
1236             {
1237                 //
1238                 // Never add xaml only workflows to the cache
1239                 // Each one must be handled distinctly
1240                 return CreateProfile(profile, schedule, service.GetType());
1241             }
1242             else
1243             {
1244                 tp = CreateProfile(profile, workflowType, service.GetType());
1245             }
1246
1247             lock (_cacheLock)
1248             {
1249                 //
1250                 // Recheck the cache with exclusive access
1251                 RTTrackingProfile tmp = null;
1252                 if (TryGetFromCache(service.GetType(), workflowType, profile.Version, out tmp))
1253                     return tmp;
1254                 //
1255                 // Add it to the cache
1256                 if (!AddToCache(tp, service.GetType()))
1257                     throw new ApplicationException(ExecutionStringManager.ProfileCacheInsertFailure);
1258
1259                 return tp;
1260             }
1261         }
1262         /// <summary>
1263         /// Retrieves the specified version of a profile from the specified service
1264         /// </summary>
1265         internal RTTrackingProfile GetProfile(TrackingService service, Activity workflow, Version versionId)
1266         {
1267             if (null == service)
1268                 throw new ArgumentNullException("service");
1269             if (null == workflow)
1270                 throw new ArgumentNullException("workflow");
1271
1272             if (!_init)
1273                 throw new InvalidOperationException(ExecutionStringManager.TrackingProfileManagerNotInitialized);
1274
1275             Type workflowType = workflow.GetType();
1276             RTTrackingProfile tp = null;
1277             //
1278             // Looking for a specific version, see if it is in the cache
1279             if (TryGetFromCache(service.GetType(), workflowType, versionId, out tp))
1280                 return tp;
1281
1282             TrackingProfile profile = service.GetProfile(workflowType, versionId);
1283             //
1284             // No profile, create it
1285             string xaml = workflow.GetValue(Activity.WorkflowXamlMarkupProperty) as string;
1286             if (null != xaml && xaml.Length > 0)
1287             {
1288                 //
1289                 // Never add xaml only workflows to the cache
1290                 // Each one must be handled distinctly
1291                 return CreateProfile(profile, workflow, service.GetType());
1292             }
1293             else
1294             {
1295                 tp = CreateProfile(profile, workflowType, service.GetType());
1296             }
1297
1298             lock (_cacheLock)
1299             {
1300                 //
1301                 // Recheck the cache with exclusive access
1302                 RTTrackingProfile tmp = null;
1303                 if (TryGetFromCache(service.GetType(), workflowType, versionId, out tmp))
1304                     return tmp;
1305                 //
1306                 // Add it to the cache
1307                 if (!AddToCache(tp, service.GetType()))
1308                     throw new ApplicationException(ExecutionStringManager.ProfileCacheInsertFailure);
1309
1310                 return tp;
1311             }
1312         }
1313
1314         internal RTTrackingProfile GetProfile(TrackingService service, Activity workflow, Guid instanceId)
1315         {
1316             //
1317             // An instance based profile will never be in the cache
1318             TrackingProfile profile = service.GetProfile(instanceId);
1319
1320             if (null == profile)
1321                 return null;
1322
1323             return new RTTrackingProfile(profile, workflow, service.GetType());
1324         }
1325
1326         #region Private Methods
1327
1328         private RTTrackingProfile CreateProfile(TrackingProfile profile, Type workflowType, Type serviceType)
1329         {
1330             //
1331             // Can't use the activity definition that we have here, it may have been updated
1332             // Get the base definition and use it to create the profile.
1333             Activity tmpSchedule = _runtime.GetWorkflowDefinition(workflowType);
1334             return new RTTrackingProfile(profile, tmpSchedule, serviceType);
1335         }
1336         private RTTrackingProfile CreateProfile(TrackingProfile profile, Activity schedule, Type serviceType)
1337         {
1338             //
1339             // This is called for Xaml only workflows
1340             return new RTTrackingProfile(profile, schedule, serviceType);
1341         }
1342         /// <summary>
1343         /// Add a profile to the cache but do not reset the NoProfiles flag for the schedule type
1344         /// </summary>
1345         /// <param name="profile">RTTrackingProfile to add</param>
1346         /// <param name="serviceType">TrackingService type</param>
1347         /// <returns>True if the profile was successfully added; false if not</returns>
1348         private bool AddToCache(RTTrackingProfile profile, Type serviceType)
1349         {
1350             return AddToCache(profile, serviceType, false);
1351         }
1352         /// <summary>
1353         /// Adds a profile to the cache and optionally resets the NoProfiles flag for the schedule type
1354         /// </summary>
1355         /// <param name="profile">RTTrackingProfile to add</param>
1356         /// <param name="serviceType">TrackingService type</param>
1357         /// <param name="resetNoProfiles">true will reset NoProfiles (to false); false will leave NoProfiles as is</param>
1358         /// <returns>True if the profile was successfully added; false if not</returns>
1359         private bool AddToCache(RTTrackingProfile profile, Type serviceType, bool resetNoProfiles)
1360         {
1361             //
1362             // Profile may be null, serviceType may not
1363             if (null == serviceType)
1364                 return false;
1365
1366             lock (_cacheLock)
1367             {
1368                 Dictionary<Type, ProfileList> schedules = null;
1369                 //
1370                 // Get the dictionary for the service type,
1371                 // create it if it doesn't exist
1372                 if (!_cacheLookup.TryGetValue(serviceType, out schedules))
1373                 {
1374                     schedules = new Dictionary<Type, ProfileList>();
1375                     _cacheLookup.Add(serviceType, schedules);
1376                 }
1377                 //
1378                 // The the ProfileList for the schedule type,
1379                 // create it if it doesn't exist
1380                 ProfileList profiles = null;
1381                 if (!schedules.TryGetValue(profile.WorkflowType, out profiles))
1382                 {
1383                     profiles = new ProfileList();
1384                     schedules.Add(profile.WorkflowType, profiles);
1385                 }
1386                 if (resetNoProfiles)
1387                     profiles.NoProfile = false;
1388                 return profiles.Profiles.TryAdd(new CacheItem(profile));
1389             }
1390         }
1391         /// <summary>
1392         /// Gets a profile from the cache
1393         /// </summary>
1394         private bool TryGetFromCache(Type serviceType, Type workflowType, out RTTrackingProfile profile)
1395         {
1396             return TryGetFromCache(serviceType, workflowType, new Version(0, 0), out profile); // 0 is an internal signal to get the most current
1397         }
1398         /// <summary>
1399         /// Gets a profile from the cache
1400         /// </summary>
1401         private bool TryGetFromCache(Type serviceType, Type workflowType, Version versionId, out RTTrackingProfile profile)
1402         {
1403             profile = null;
1404             CacheItem item = null;
1405             lock (_cacheLock)
1406             {
1407                 Dictionary<Type, ProfileList> schedules = null;
1408
1409                 if (!_cacheLookup.TryGetValue(serviceType, out schedules))
1410                     return false;
1411
1412                 ProfileList profiles = null;
1413                 if (!schedules.TryGetValue(workflowType, out profiles))
1414                     return false;
1415
1416                 //
1417                 // 0 means get the current version
1418                 if (0 == versionId.Major)
1419                 {
1420                     //
1421                     // Currently the schedule type doesn't have a profile associated to it
1422                     if (profiles.NoProfile)
1423                         return true;
1424
1425                     if ((null == profiles.Profiles) || (0 == profiles.Profiles.Count))
1426                         return false;
1427
1428                     //
1429                     // Current version is highest versionId
1430                     // which means it is at the end of the Set
1431                     int endPos = profiles.Profiles.Count - 1;
1432
1433                     if (null == profiles.Profiles[endPos])
1434                         return false;
1435
1436                     profile = profiles.Profiles[endPos].TrackingProfile;
1437                     return true;
1438                 }
1439                 else
1440                 {
1441                     if ((null == profiles.Profiles) || (0 == profiles.Profiles.Count))
1442                         return false;
1443
1444                     if (profiles.Profiles.TryGetValue(new CacheItem(workflowType, versionId), out item))
1445                     {
1446                         profile = item.TrackingProfile;
1447                         return true;
1448                     }
1449                     else
1450                         return false;
1451                 }
1452             }
1453         }
1454
1455         #endregion
1456
1457         #region Event Handlers
1458         /// <summary>
1459         /// Listens on ProfileUpdated events from IProfileNotification services
1460         /// </summary>
1461         /// <param name="sender">Type of the tracking service sending the update</param>
1462         /// <param name="e">ProfileUpdatedEventArgs containing the new profile and the schedule type</param>
1463         private void ProfileUpdated(object sender, ProfileUpdatedEventArgs e)
1464         {
1465             if (null == sender)
1466                 throw new ArgumentNullException("sender");
1467
1468             Type t = sender.GetType();
1469
1470             if (null == e.WorkflowType)
1471                 throw new ArgumentNullException("e");
1472
1473             if (null == e.TrackingProfile)
1474             {
1475                 RemoveProfile(e.WorkflowType, t);
1476                 return;
1477             }
1478
1479             RTTrackingProfile profile = CreateProfile(e.TrackingProfile, e.WorkflowType, t);
1480             //
1481             // If AddToCache fails this version is already in the cache and we don't care
1482             AddToCache(profile, t, true);
1483         }
1484
1485         private void ProfileRemoved(object sender, ProfileRemovedEventArgs e)
1486         {
1487             if (null == sender)
1488                 throw new ArgumentNullException("sender");
1489
1490             if (null == e.WorkflowType)
1491                 throw new ArgumentNullException("e");
1492
1493             RemoveProfile(e.WorkflowType, sender.GetType());
1494         }
1495
1496         private void RemoveProfile(Type workflowType, Type serviceType)
1497         {
1498             lock (_cacheLock)
1499             {
1500                 Dictionary<Type, ProfileList> schedules = null;
1501
1502                 if (!_cacheLookup.TryGetValue(serviceType, out schedules))
1503                 {
1504                     schedules = new Dictionary<Type, ProfileList>();
1505                     _cacheLookup.Add(serviceType, schedules);
1506                 }
1507                 ProfileList profiles = null;
1508                 if (!schedules.TryGetValue(workflowType, out profiles))
1509                 {
1510                     profiles = new ProfileList();
1511                     schedules.Add(workflowType, profiles);
1512                 }
1513                 //
1514                 // Finally indicate that there isn't a profile for this schedule type
1515                 // Calling UpdateProfile for this type will result in resetting this field
1516                 // regardless of whether the version of the profile passed is in the cache or not
1517                 profiles.NoProfile = true;
1518             }
1519         }
1520         #endregion
1521
1522         #region Private Classes
1523         private class ProfileList
1524         {
1525             internal bool NoProfile = false;
1526             internal Set<CacheItem> Profiles = new Set<CacheItem>(5);
1527         }
1528
1529         private class CacheItem : IComparable
1530         {
1531             internal RTTrackingProfile TrackingProfile = null;
1532             internal DateTime LastAccess = DateTime.UtcNow;
1533             //
1534             // VersionId and ScheduleType are stored separately from the profile so that they
1535             // can be used to identify the profile if it has been pushed from the cache.
1536             internal Version VersionId = new Version(0, 0);
1537             internal Type ScheduleType = null;
1538
1539             internal CacheItem()
1540             {
1541             }
1542
1543             internal CacheItem(RTTrackingProfile profile)
1544             {
1545                 if (null == profile)
1546                     throw new ArgumentNullException("profile");
1547
1548                 ScheduleType = profile.WorkflowType;
1549
1550                 this.TrackingProfile = profile;
1551                 VersionId = profile.Version;
1552             }
1553
1554             internal CacheItem(Type workflowType, Version versionId)
1555             {
1556                 VersionId = versionId;
1557                 ScheduleType = workflowType;
1558             }
1559
1560             #region IComparable Members
1561
1562             public int CompareTo(object obj)
1563             {
1564                 if (!(obj is CacheItem))
1565                     throw new ArgumentException(ExecutionStringManager.InvalidCacheItem);
1566
1567                 CacheItem item = (CacheItem)obj;
1568                 if ((VersionId == item.VersionId) && (ScheduleType == item.ScheduleType))
1569                     return 0;
1570                 else
1571                     return (VersionId > item.VersionId) ? 1 : -1;
1572             }
1573
1574             #endregion
1575         }
1576         #endregion
1577
1578     }
1579     /// <summary>
1580     /// Represents a wrapper around a channel and its artifacts, such as its tracking service type and profile
1581     /// </summary>
1582     internal class TrackingChannelWrapper
1583     {
1584         private Type _serviceType = null, _scheduleType = null;
1585         private TrackingChannel _channel = null;
1586         [NonSerialized]
1587         private RTTrackingProfile _profile = null;
1588         private Version _profileVersionId;
1589
1590         private TrackingChannelWrapper() { }
1591
1592         public TrackingChannelWrapper(TrackingChannel channel, Type serviceType, Type workflowType, RTTrackingProfile profile)
1593         {
1594             _serviceType = serviceType;
1595             _scheduleType = workflowType;
1596             _channel = channel;
1597             _profile = profile;
1598             _profileVersionId = profile.Version;
1599         }
1600
1601         internal Type TrackingServiceType
1602         {
1603             get { return _serviceType; }
1604         }
1605
1606         internal TrackingChannel TrackingChannel
1607         {
1608             get { return _channel; }
1609         }
1610         /// <summary>
1611         /// Get the tracking profile for the channel
1612         /// </summary>
1613         /// <param name="exec">BaseExecutor</param>
1614         /// <returns>RTTrackingProfile</returns>
1615         internal RTTrackingProfile GetTrackingProfile(WorkflowExecutor skedExec)
1616         {
1617             if (null != _profile)
1618                 return _profile;
1619             else
1620                 throw new InvalidOperationException(String.Format(System.Globalization.CultureInfo.CurrentCulture, ExecutionStringManager.NullProfileForChannel, this._scheduleType.AssemblyQualifiedName));
1621         }
1622
1623         internal void SetTrackingProfile(RTTrackingProfile profile)
1624         {
1625             _profile = profile;
1626         }
1627
1628         /// <summary>
1629         /// Clone the tracking profile stored in the cache and
1630         /// </summary>
1631         /// <param name="exec"></param>
1632         internal void MakeProfilePrivate(WorkflowExecutor exec)
1633         {
1634             if (null != _profile)
1635             {
1636                 //
1637                 // If the profile is not already a private copy make it so
1638                 if (!_profile.IsPrivate)
1639                 {
1640                     _profile = _profile.Clone();
1641                     _profile.IsPrivate = true;
1642                 }
1643             }
1644             else
1645             {
1646                 //
1647                 // We're not holding a reference to a profile
1648                 // so get it from the cache and clone it into a private copy
1649                 RTTrackingProfile tmp = GetTrackingProfile(exec);
1650                 _profile = tmp.Clone();
1651                 _profile.IsPrivate = true;
1652             }
1653         }
1654     }
1655     internal class Set<T> : IEnumerable<T> where T : IComparable
1656     {
1657         List<T> list = null;
1658
1659         public Set()
1660         {
1661             list = new List<T>();
1662         }
1663
1664         public Set(int capacity)
1665         {
1666             list = new List<T>(capacity);
1667         }
1668
1669         public int Count
1670         {
1671             get { return list.Count; }
1672         }
1673
1674         public void Add(T item)
1675         {
1676             int pos = -1;
1677             if (!Search(item, out pos))
1678                 list.Insert(pos, item);
1679             else
1680                 throw new ArgumentException(ExecutionStringManager.ItemAlreadyExist);
1681         }
1682
1683         public bool TryAdd(T item)
1684         {
1685             int pos = -1;
1686             if (!Search(item, out pos))
1687             {
1688                 list.Insert(pos, item);
1689                 return true;
1690             }
1691             else
1692                 return false;
1693         }
1694
1695         public bool Contains(T item)
1696         {
1697             int pos = -1;
1698             return Search(item, out pos);
1699         }
1700
1701         public IEnumerator<T> GetEnumerator()
1702         {
1703             return list.GetEnumerator();
1704         }
1705
1706         System.Collections.IEnumerator IEnumerable.GetEnumerator()
1707         {
1708             return list.GetEnumerator();
1709         }
1710
1711         public bool TryGetValue(T item, out T value)
1712         {
1713             int pos = -1;
1714             if (Search(item, out pos))
1715             {
1716                 value = list[pos];
1717                 return true;
1718             }
1719             else
1720             {
1721                 value = default(T);
1722                 return false;
1723             }
1724         }
1725
1726         public T this[int index]
1727         {
1728             get { return list[index]; }
1729         }
1730
1731         private bool Search(T item, out int insertPos)
1732         {
1733             insertPos = -1;
1734
1735             int pos = 0,
1736                 high = list.Count,
1737                 low = -1,
1738                 diff = 0;
1739
1740             while (high - low > 1)
1741             {
1742                 pos = (high + low) / 2;
1743
1744                 diff = list[pos].CompareTo(item);
1745
1746                 if (0 == diff)
1747                 {
1748                     insertPos = pos;
1749                     return true;
1750                 }
1751                 else if (diff > 0)
1752                     high = pos;
1753                 else
1754                     low = pos;
1755             }
1756
1757             if (low == -1)
1758             {
1759                 insertPos = 0;
1760                 return false;
1761             }
1762
1763             if (0 != diff)
1764             {
1765                 insertPos = (diff < 0) ? pos + 1 : pos;
1766                 return false;
1767             }
1768
1769             return true;
1770         }
1771     }
1772
1773     /// <summary>
1774     /// Persisted tracking State pertaining to workflow invoking for an individual schedule.  There could be multiple called schedules under
1775     /// an instance.
1776     /// </summary>
1777     [Serializable]
1778     internal class TrackingCallingState
1779     {
1780         #region data members
1781         private IList<string> callerActivityPathProxy;
1782         private Guid callerInstanceId;
1783         private Guid callerContextGuid;
1784         private Guid callerParentContextGuid;
1785
1786         #endregion data members
1787
1788         #region Property accessors
1789
1790         /// <summary>
1791         /// Activity proxy of the caller/execer activity, if any
1792         /// //@@Undone for Ashishmi: Hold on to ActivityPath Proxy  in one of your class impl
1793         /// </summary>
1794         /// <value></value>
1795         internal IList<string> CallerActivityPathProxy
1796         {
1797             get { return callerActivityPathProxy; }
1798             set { callerActivityPathProxy = value; }
1799         }
1800
1801         /// <summary>
1802         /// Instance ID of the caller/exec'er schedule, if any
1803         /// </summary>
1804         /// <value></value>
1805         public Guid CallerWorkflowInstanceId
1806         {
1807             get { return callerInstanceId; }
1808             set { callerInstanceId = value; }
1809         }
1810         /// <summary>
1811         /// Context of the caller's invoke activity
1812         /// </summary>
1813         /// <value>int</value>
1814         public Guid CallerContextGuid
1815         {
1816             get { return callerContextGuid; }
1817             set { callerContextGuid = value; }
1818         }
1819         /// <summary>
1820         /// ParentContext of the caller's invoke activity
1821         /// </summary>
1822         /// <value>int</value>
1823         public Guid CallerParentContextGuid
1824         {
1825             get { return callerParentContextGuid; }
1826             set { callerParentContextGuid = value; }
1827         }
1828
1829         #endregion Property accessors
1830
1831     }
1832
1833     internal static class HashHelper
1834     {
1835         internal static Guid HashServiceType(Type serviceType)
1836         {
1837             return HashServiceType(serviceType.AssemblyQualifiedName);
1838         }
1839
1840         [SuppressMessage("Microsoft.Cryptographic.Standard", "CA5350:MD5CannotBeUsed",
1841             Justification = "Design has been approved.  We are not using MD5 for any security or cryptography purposes but rather as a hash.")]
1842         internal static Guid HashServiceType(String serviceFullTypeName)
1843         {
1844             byte[] data;
1845             byte[] result;
1846
1847             UnicodeEncoding ue = new UnicodeEncoding();
1848             data = ue.GetBytes(serviceFullTypeName);
1849
1850             if (AppSettings.FIPSRequired)
1851             {
1852                 result = MD5PInvokeHelper.CalculateHash(data);
1853             }
1854             else
1855             {
1856                 MD5 md5 = new MD5CryptoServiceProvider();
1857                 result = md5.ComputeHash(data);
1858             }
1859
1860             return new Guid(result);
1861         }
1862     }
1863 }