mcs/class/System.ServiceModel/System.ServiceModel.Dispatcher/ChannelDispatcher.cs

   1 //
   2 // ChannelDispatcher.cs
   3 //
   4 // Author:
   5 //      Atsushi Enomoto <atsushi@ximian.com>
   6 //
   7 // Copyright (C) 2005,2009 Novell, Inc.  http://www.novell.com
   8 //
   9 // Permission is hereby granted, free of charge, to any person obtaining
  10 // a copy of this software and associated documentation files (the
  11 // "Software"), to deal in the Software without restriction, including
  12 // without limitation the rights to use, copy, modify, merge, publish,
  13 // distribute, sublicense, and/or sell copies of the Software, and to
  14 // permit persons to whom the Software is furnished to do so, subject to
  15 // the following conditions:
  16 //
  17 // The above copyright notice and this permission notice shall be
  18 // included in all copies or substantial portions of the Software.
  19 //
  20 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  21 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  22 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  23 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  24 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  25 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  26 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  27 //
  28 using System;
  29 using System.Collections.Generic;
  30 using System.Collections.ObjectModel;
  31 using System.Linq;
  32 using System.Reflection;
  33 using System.ServiceModel.Channels;
  34 using System.Threading;
  35 using System.Transactions;
  36 using System.ServiceModel;
  37 using System.ServiceModel.Description;
  38
  39 namespace System.ServiceModel.Dispatcher
  40 {
  41         public class ChannelDispatcher : ChannelDispatcherBase
  42         {
  43                 class EndpointDispatcherCollection : SynchronizedCollection<EndpointDispatcher>
  44                 {
  45                         public EndpointDispatcherCollection (ChannelDispatcher owner)
  46                         {
  47                                 this.owner = owner;
  48                         }
  49
  50                         ChannelDispatcher owner;
  51
  52                         protected override void ClearItems ()
  53                         {
  54                                 foreach (var ed in this)
  55                                         ed.ChannelDispatcher = null;
  56                                 base.ClearItems ();
  57                         }
  58
  59                         protected override void InsertItem (int index, EndpointDispatcher item)
  60                         {
  61                                 item.ChannelDispatcher = owner;
  62                                 base.InsertItem (index, item);
  63                         }
  64
  65                         protected override void RemoveItem (int index)
  66                         {
  67                                 if (index < Count)
  68                                         this [index].ChannelDispatcher = null;
  69                                 base.RemoveItem (index);
  70                         }
  71
  72                         protected override void SetItem (int index, EndpointDispatcher item)
  73                         {
  74                                 item.ChannelDispatcher = owner;
  75                                 base.SetItem (index, item);
  76                         }
  77                 }
  78
  79                 ServiceHostBase host;
  80
  81                 string binding_name;
  82                 Collection<IErrorHandler> error_handlers
  83                         = new Collection<IErrorHandler> ();
  84                 IChannelListener listener;
  85                 internal IDefaultCommunicationTimeouts timeouts; // FIXME: remove internal
  86                 MessageVersion message_version;
  87                 bool receive_sync, include_exception_detail_in_faults,
  88                         manual_addressing, is_tx_receive;
  89                 int max_tx_batch_size;
  90                 SynchronizedCollection<IChannelInitializer> initializers
  91                         = new SynchronizedCollection<IChannelInitializer> ();
  92                 IsolationLevel tx_isolation_level;
  93                 TimeSpan tx_timeout;
  94                 ServiceThrottle throttle;
  95
  96                 Guid identifier = Guid.NewGuid ();
  97                 ManualResetEvent async_event = new ManualResetEvent (false);
  98
  99                 ListenerLoopManager loop_manager;
 100                 SynchronizedCollection<EndpointDispatcher> endpoints;
 101
 102                 [MonoTODO ("get binding info from config")]
 103                 public ChannelDispatcher (IChannelListener listener)
 104                         : this (listener, null)
 105                 {
 106                 }
 107
 108                 public ChannelDispatcher (
 109                         IChannelListener listener, string bindingName)
 110                         : this (listener, bindingName, null)
 111                 {
 112                 }
 113
 114                 public ChannelDispatcher (
 115                         IChannelListener listener, string bindingName,
 116                         IDefaultCommunicationTimeouts timeouts)
 117                 {
 118                         if (listener == null)
 119                                 throw new ArgumentNullException ("listener");
 120                         Init (listener, bindingName, timeouts);
 121                 }
 122
 123                 private void Init (IChannelListener listener, string bindingName,
 124                         IDefaultCommunicationTimeouts timeouts)
 125                 {
 126                         this.listener = listener;
 127                         this.binding_name = bindingName;
 128                         // IChannelListener is often a ChannelListenerBase
 129                         // which implements IDefaultCommunicationTimeouts.
 130                         this.timeouts = timeouts ?? listener as IDefaultCommunicationTimeouts ?? DefaultCommunicationTimeouts.Instance;
 131                         endpoints = new EndpointDispatcherCollection (this);
 132                 }
 133
 134                 internal EndpointDispatcher InitializeServiceEndpoint (Type serviceType, ServiceEndpoint se)
 135                 {
 136                         //Attach one EndpointDispacher to the ChannelDispatcher
 137                         EndpointDispatcher ed = new EndpointDispatcher (se.Address, se.Contract.Name, se.Contract.Namespace);
 138                         this.Endpoints.Add (ed);
 139                         ed.InitializeServiceEndpoint (false, serviceType, se);
 140                         return ed;
 141                 }
 142
 143                 public string BindingName {
 144                         get { return binding_name; }
 145                 }
 146
 147                 public SynchronizedCollection<IChannelInitializer> ChannelInitializers {
 148                         get { return initializers; }
 149                 }
 150
 151                 protected internal override TimeSpan DefaultCloseTimeout {
 152                         get { return timeouts.CloseTimeout; }
 153                 }
 154
 155                 protected internal override TimeSpan DefaultOpenTimeout {
 156                         get { return timeouts.OpenTimeout; }
 157                 }
 158
 159                 public Collection<IErrorHandler> ErrorHandlers {
 160                         get { return error_handlers; }
 161                 }
 162
 163                 public SynchronizedCollection<EndpointDispatcher> Endpoints {
 164                         get { return endpoints; }
 165                 }
 166
 167                 [MonoTODO]
 168                 public bool IsTransactedAccept {
 169                         get { throw new NotImplementedException (); }
 170                 }
 171
 172                 public bool IsTransactedReceive {
 173                         get { return is_tx_receive; }
 174                         set { is_tx_receive = value; }
 175                 }
 176
 177                 public bool ManualAddressing {
 178                         get { return manual_addressing; }
 179                         set { manual_addressing = value; }
 180                 }
 181
 182                 public int MaxTransactedBatchSize {
 183                         get { return max_tx_batch_size; }
 184                         set { max_tx_batch_size = value; }
 185                 }
 186
 187                 public override ServiceHostBase Host {
 188                         get { return host; }
 189                 }
 190
 191                 public override IChannelListener Listener {
 192                         get { return listener; }
 193                 }
 194
 195                 public MessageVersion MessageVersion {
 196                         get { return message_version; }
 197                         set { message_version = value; }
 198                 }
 199
 200                 public bool ReceiveSynchronously {
 201                         get { return receive_sync; }
 202                         set {
 203                                 ThrowIfDisposedOrImmutable ();
 204                                 receive_sync = value;
 205                         }
 206                 }
 207
 208                 public bool IncludeExceptionDetailInFaults {
 209                         get { return include_exception_detail_in_faults; }
 210                         set { include_exception_detail_in_faults = value; }
 211                 }
 212
 213                 public ServiceThrottle ServiceThrottle {
 214                         get { return throttle; }
 215                         set { throttle = value; }
 216                 }
 217
 218                 public IsolationLevel TransactionIsolationLevel {
 219                         get { return tx_isolation_level; }
 220                         set { tx_isolation_level = value; }
 221                 }
 222
 223                 public TimeSpan TransactionTimeout {
 224                         get { return tx_timeout; }
 225                         set { tx_timeout = value; }
 226                 }
 227
 228                 protected internal override void Attach (ServiceHostBase host)
 229                 {
 230                         this.host = host;
 231                         var bl = listener as IChannelDispatcherBoundListener;
 232                         if (bl != null)
 233                                 bl.ChannelDispatcher = this;
 234                 }
 235
 236                 public override void CloseInput ()
 237                 {
 238                         if (loop_manager != null)
 239                                 loop_manager.CloseInput ();
 240                 }
 241
 242                 protected internal override void Detach (ServiceHostBase host)
 243                 {
 244                         this.host = null;
 245                 }
 246
 247                 protected override void OnAbort ()
 248                 {
 249                         if (loop_manager != null)
 250                                 loop_manager.Stop (TimeSpan.FromTicks (1));
 251                 }
 252
 253                 Action<TimeSpan> open_delegate;
 254                 Action<TimeSpan> close_delegate;
 255
 256                 protected override IAsyncResult OnBeginClose (TimeSpan timeout,
 257                         AsyncCallback callback, object state)
 258                 {
 259                         if (close_delegate == null)
 260                                 close_delegate = new Action<TimeSpan> (OnClose);
 261                         return close_delegate.BeginInvoke (timeout, callback, state);
 262                 }
 263
 264                 protected override IAsyncResult OnBeginOpen (TimeSpan timeout,
 265                         AsyncCallback callback, object state)
 266                 {
 267                         if (open_delegate == null)
 268                                 open_delegate = new Action<TimeSpan> (OnOpen);
 269                         return open_delegate.BeginInvoke (timeout, callback, state);
 270                 }
 271
 272                 protected override void OnClose (TimeSpan timeout)
 273                 {
 274                         if (loop_manager != null)
 275                                 loop_manager.Stop (timeout);
 276                 }
 277
 278                 protected override void OnClosed ()
 279                 {
 280                         if (host != null)
 281                                 host.ChannelDispatchers.Remove (this);
 282                         base.OnClosed ();
 283                 }
 284
 285                 protected override void OnEndClose (IAsyncResult result)
 286                 {
 287                         close_delegate.EndInvoke (result);
 288                 }
 289
 290                 protected override void OnEndOpen (IAsyncResult result)
 291                 {
 292                         open_delegate.EndInvoke (result);
 293                 }
 294
 295                 protected override void OnOpen (TimeSpan timeout)
 296                 {
 297                         if (Host == null || MessageVersion == null)
 298                                 throw new InvalidOperationException ("Service host is not attached to this ChannelDispatcher.");
 299
 300                         loop_manager.Setup (timeout);
 301                 }
 302
 303                 protected override void OnOpening ()
 304                 {
 305                         base.OnOpening ();
 306                         loop_manager = new ListenerLoopManager (this);
 307                 }
 308
 309                 protected override void OnOpened ()
 310                 {
 311                         base.OnOpened ();
 312                         StartLoop ();
 313                 }
 314
 315                 void StartLoop ()
 316                 {
 317                         // FIXME: not sure if it should be filled here.
 318                         if (ServiceThrottle == null)
 319                                 ServiceThrottle = new ServiceThrottle (this);
 320
 321                         loop_manager.Start ();
 322                 }
 323         }
 324
 325                 // isolated from ChannelDispatcher
 326                 class ListenerLoopManager
 327                 {
 328                         ChannelDispatcher owner;
 329                         AutoResetEvent throttle_wait_handle = new AutoResetEvent (false);
 330                         AutoResetEvent creator_handle = new AutoResetEvent (false);
 331                         ManualResetEvent stop_handle = new ManualResetEvent (false);
 332                         bool loop;
 333                         Thread loop_thread;
 334                         DateTime close_started;
 335                         TimeSpan close_timeout;
 336                         Func<IAsyncResult> channel_acceptor;
 337                         List<IChannel> channels = new List<IChannel> ();
 338                         AddressFilterMode address_filter_mode;
 339                         List<ISession> sessions = new List<ISession> ();
 340
 341                         public ListenerLoopManager (ChannelDispatcher owner)
 342                         {
 343                                 this.owner = owner;
 344                                 var sba = owner.Host != null ? owner.Host.Description.Behaviors.Find<ServiceBehaviorAttribute> () : null;
 345                                 if (sba != null)
 346                                         address_filter_mode = sba.AddressFilterMode;
 347                         }
 348
 349                         public void Setup (TimeSpan openTimeout)
 350                         {
 351                                 if (owner.Listener.State != CommunicationState.Created)
 352                                         throw new InvalidOperationException ("Tried to open the channel listener which is bound to ChannelDispatcher, but it is not at Created state");
 353                                 owner.Listener.Open (openTimeout);
 354
 355                                 // It is tested at Open(), but strangely it is not instantiated at this point.
 356                                 foreach (var ed in owner.Endpoints)
 357                                         if (ed.DispatchRuntime.InstanceContextProvider == null && (ed.DispatchRuntime.Type == null || ed.DispatchRuntime.Type.GetConstructor (Type.EmptyTypes) == null))
 358                                                 throw new InvalidOperationException ("There is no default constructor for the service Type in the DispatchRuntime");
 359                                 SetupChannelAcceptor ();
 360                         }
 361
 362                         public void Start ()
 363                         {
 364                                 if (loop_thread == null)
 365                                         loop_thread = new Thread (new ThreadStart (Loop));
 366                                 loop_thread.Start ();
 367                         }
 368
 369                         Func<IAsyncResult> CreateAcceptor<TChannel> (IChannelListener l) where TChannel : class, IChannel
 370                         {
 371                                 IChannelListener<TChannel> r = l as IChannelListener<TChannel>;
 372                                 if (r == null)
 373                                         return null;
 374                                 AsyncCallback callback = delegate (IAsyncResult result) {
 375                                         try {
 376                                                 ChannelAccepted (r.EndAcceptChannel (result));
 377                                         } catch (Exception ex) {
 378                                                 Logger.Error ("Exception during finishing channel acceptance.", ex);
 379                                                 creator_handle.Set ();
 380                                         }
 381                                 };
 382                                 return delegate {
 383                                         try {
 384                                                 return r.BeginAcceptChannel (callback, null);
 385                                         } catch (Exception ex) {
 386                                                 Logger.Error ("Exception during accepting channel.", ex);
 387                                                 throw;
 388                                         }
 389                                 };
 390                         }
 391
 392                         void SetupChannelAcceptor ()
 393                         {
 394                                 var l = owner.Listener;
 395                                 channel_acceptor =
 396                                         CreateAcceptor<IReplyChannel> (l) ??
 397                                         CreateAcceptor<IReplySessionChannel> (l) ??
 398                                         CreateAcceptor<IInputChannel> (l) ??
 399                                         CreateAcceptor<IInputSessionChannel> (l) ??
 400                                         CreateAcceptor<IDuplexChannel> (l) ??
 401                                         CreateAcceptor<IDuplexSessionChannel> (l);
 402                                 if (channel_acceptor == null)
 403                                         throw new InvalidOperationException (String.Format ("Unrecognized channel listener type: {0}", l.GetType ()));
 404                         }
 405
 406                         public void Stop (TimeSpan timeout)
 407                         {
 408                                 if (loop_thread == null)
 409                                         return;
 410
 411                                 close_started = DateTime.Now;
 412                                 close_timeout = timeout;
 413                                 loop = false;
 414                                 creator_handle.Set ();
 415                                 throttle_wait_handle.Set (); // break primary loop
 416                                 if (stop_handle != null) {
 417                                         stop_handle.WaitOne (timeout > TimeSpan.Zero ? timeout : TimeSpan.FromTicks (1));
 418                                         stop_handle.Close ();
 419                                         stop_handle = null;
 420                                 }
 421                                 if (owner.Listener.State != CommunicationState.Closed) {
 422                                         Logger.Warning (String.Format ("Channel listener '{0}' is not closed. Aborting.", owner.Listener.GetType ()));
 423                                         owner.Listener.Abort ();
 424                                 }
 425                                 if (loop_thread != null && loop_thread.IsAlive)
 426                                         loop_thread.Abort ();
 427                                 loop_thread = null;
 428                         }
 429
 430                         void AddChannel (IChannel ch)
 431                         {
 432                                 channels.Add (ch);
 433                                 var ich = ch as ISessionChannel<IInputSession>;
 434                                 if (ich != null && ich.Session != null) {
 435                                         lock (sessions) {
 436                                                 var session = sessions.FirstOrDefault (s => s.Id == ich.Session.Id);
 437                                                 if (session == null)
 438                                                         sessions.Add (session);
 439                                         }
 440                                 }
 441                         }
 442
 443                         void RemoveChannel (IChannel ch)
 444                         {
 445                                 channels.Remove (ch); // zonbie, if exists
 446                                 var ich = ch as ISessionChannel<IInputSession>;
 447
 448                                 if (ich != null && ich.Session != null)
 449                                         sessions.Remove (ich.Session);
 450                         }
 451
 452                         public void CloseInput ()
 453                         {
 454                                 foreach (var ch in channels.ToArray ()) {
 455                                         if (ch.State == CommunicationState.Closed)
 456                                                 RemoveChannel (ch);
 457                                         else {
 458                                                 try {
 459                                                         ch.Close (close_timeout - (DateTime.Now - close_started));
 460                                                 } catch (Exception ex) {
 461                                                         // FIXME: log it.
 462                                                         Logger.Error (String.Format ("Exception on closing channel ({0})", ch.GetType ()), ex);
 463                                                         ch.Abort ();
 464                                                 }
 465                                         }
 466                                 }
 467                         }
 468
 469                         void Loop ()
 470                         {
 471                                 try {
 472                                         LoopCore ();
 473                                 } catch (Exception ex) {
 474                                         Logger.Error (String.Format ("ListenerLoopManager caught an exception inside dispatcher loop, which is likely thrown by the channel listener {0}", owner.Listener), ex);
 475                                 } finally {
 476                                         if (stop_handle != null)
 477                                                 stop_handle.Set ();
 478                                 }
 479                         }
 480
 481                         void LoopCore ()
 482                         {
 483                                 loop = true;
 484
 485                                 // FIXME: use WaitForChannel() for (*only* for) transacted channel listeners.
 486                                 // http://social.msdn.microsoft.com/Forums/en-US/wcf/thread/3faa4a5e-8602-4dbe-a181-73b3f581835e
 487
 488                                 while (loop) {
 489                                         // FIXME: take MaxConcurrentCalls into consideration appropriately.
 490                                         while (loop && channels.Count < Math.Min (owner.ServiceThrottle.MaxConcurrentSessions, owner.ServiceThrottle.MaxConcurrentCalls)) {
 491                                                 // FIXME: this should not be required, but saves multi-ChannelDispatcher case (Throttling enabled) for HTTP standalone listener...
 492                                                 Thread.Sleep (100);
 493                                                 channel_acceptor ();
 494                                                 creator_handle.WaitOne (); // released by ChannelAccepted()
 495                                         }
 496                                         if (!loop)
 497                                                 break;
 498                                         throttle_wait_handle.WaitOne (); // released by IChannel.Close()
 499                                 }
 500                                 try {
 501                                         owner.Listener.Close ();
 502                                 } catch (Exception ex) {
 503                                         Logger.Error (String.Format ("Exception while closing IChannelListener ({0})", owner.Listener.GetType ()), ex);
 504                                 } finally {
 505                                         // make sure to close both listener and channels.
 506                                         owner.CloseInput ();
 507                                 }
 508                         }
 509
 510                         void ChannelAccepted (IChannel ch)
 511                         {
 512                         try {
 513                                 if (ch == null) // could happen when it was aborted
 514                                         return;
 515                                 if (!loop) {
 516                                         var dis = ch as IDisposable;
 517                                         if (dis != null)
 518                                                 dis.Dispose ();
 519                                         return;
 520                                 }
 521
 522                                 lock (channels)
 523                                         AddChannel (ch);
 524                                 ch.Opened += delegate {
 525                                         ch.Faulted += delegate {
 526                                                 lock (channels)
 527                                                         if (channels.Contains (ch))
 528                                                                 RemoveChannel (ch);
 529                                                 throttle_wait_handle.Set (); // release loop wait lock.
 530                                                 };
 531                                         ch.Closed += delegate {
 532                                                 lock (channels)
 533                                                         if (channels.Contains (ch))
 534                                                                 RemoveChannel (ch);
 535                                                 throttle_wait_handle.Set (); // release loop wait lock.
 536                                                 };
 537                                         };
 538                                 ch.Open ();
 539                         } finally {
 540                                 creator_handle.Set ();
 541                         }
 542
 543                                 ProcessRequestOrInput (ch);
 544                         }
 545
 546                         void ProcessRequestOrInput (IChannel ch)
 547                         {
 548                                 var reply = ch as IReplyChannel;
 549                                 var input = ch as IInputChannel;
 550
 551                                 if (reply != null) {
 552                                         if (owner.ReceiveSynchronously) {
 553                                                 RequestContext rc;
 554                                                 if (reply.TryReceiveRequest (owner.timeouts.ReceiveTimeout, out rc))
 555                                                         ProcessRequest (reply, rc);
 556                                         } else {
 557                                                 reply.BeginTryReceiveRequest (owner.timeouts.ReceiveTimeout, TryReceiveRequestDone, reply);
 558                                         }
 559                                 } else if (input != null) {
 560                                         if (owner.ReceiveSynchronously) {
 561                                                 Message msg;
 562                                                 if (input.TryReceive (owner.timeouts.ReceiveTimeout, out msg))
 563                                                         ProcessInput (input, msg);
 564                                         } else {
 565                                                 input.BeginTryReceive (owner.timeouts.ReceiveTimeout, TryReceiveDone, input);
 566                                         }
 567                                 }
 568                         }
 569
 570                         void TryReceiveRequestDone (IAsyncResult result)
 571                         {
 572                                 RequestContext rc;
 573                                 var reply = (IReplyChannel) result.AsyncState;
 574                                 if (reply.EndTryReceiveRequest (result, out rc))
 575                                         ProcessRequest (reply, rc);
 576                                 else
 577                                         reply.Close ();
 578                         }
 579
 580                         void TryReceiveDone (IAsyncResult result)
 581                         {
 582                                 Message msg;
 583                                 var input = (IInputChannel) result.AsyncState;
 584                                 if (input.EndTryReceive (result, out msg))
 585                                         ProcessInput (input, msg);
 586                                 else
 587                                         input.Close ();
 588                         }
 589
 590                         void ProcessRequest (IReplyChannel reply, RequestContext rc)
 591                         {
 592                                 try {
 593                                         var req = rc.RequestMessage;
 594                                         var ed = FindEndpointDispatcher (req);
 595                                         new InputOrReplyRequestProcessor (ed.DispatchRuntime, reply).ProcessReply (rc);
 596                                 } catch (Exception ex) {
 597                                         Message res;
 598                                         if (ProcessErrorWithHandlers (reply, ex, out res))
 599                                                 return;
 600
 601                                         rc.Reply (res);
 602
 603                                         reply.Close (owner.DefaultCloseTimeout); // close the channel
 604                                 } finally {
 605                                         if (rc != null)
 606                                                 rc.Close ();
 607                                         // unless it is closed by session/call manager, move it back to the loop to receive the next message.
 608                                         if (loop && reply.State != CommunicationState.Closed)
 609                                                 ProcessRequestOrInput (reply);
 610                                 }
 611                         }
 612
 613                         bool ProcessErrorWithHandlers (IChannel ch, Exception ex, out Message res)
 614                         {
 615                                 res = null;
 616
 617                                 foreach (var eh in owner.ErrorHandlers)
 618                                         if (eh.HandleError (ex))
 619                                                 return true; // error is handled appropriately.
 620
 621                                 Logger.Error ("An error occured, to be handled", ex);
 622
 623                                 foreach (var eh in owner.ErrorHandlers)
 624                                         eh.ProvideFault (ex, owner.MessageVersion, ref res);
 625                                 if (res == null) {
 626                                         var conv = ch.GetProperty<FaultConverter> () ?? FaultConverter.GetDefaultFaultConverter (owner.MessageVersion);
 627                                         if (!conv.TryCreateFaultMessage (ex, out res))
 628                                                 res = Message.CreateMessage (owner.MessageVersion, new FaultCode ("Receiver"), ex.Message, owner.MessageVersion.Addressing.FaultNamespace);
 629                                 }
 630
 631                                 return false;
 632                         }
 633
 634                         void ProcessInput (IInputChannel input, Message message)
 635                         {
 636                                 try {
 637                                         EndpointDispatcher candidate = null;
 638                                         candidate = FindEndpointDispatcher (message);
 639                                         new InputOrReplyRequestProcessor (candidate.DispatchRuntime, input).ProcessInput (message);
 640                                 }
 641                                 catch (Exception ex) {
 642                                         Message dummy;
 643                                         ProcessErrorWithHandlers (input, ex, out dummy);
 644                                 } finally {
 645                                         // unless it is closed by session/call manager, move it back to the loop to receive the next message.
 646                                         if (loop && input.State != CommunicationState.Closed)
 647                                                 ProcessRequestOrInput (input);
 648                                 }
 649                         }
 650
 651                         EndpointDispatcher FindEndpointDispatcher (Message message) {
 652                                 EndpointDispatcher candidate = null;
 653                                 bool hasEndpointMatch = false;
 654                                 foreach (var endpoint in owner.Endpoints) {
 655                                         if (endpoint.AddressFilter.Match (message)) {
 656                                                 hasEndpointMatch = true;
 657                                                 if (!endpoint.ContractFilter.Match (message))
 658                                                         continue;
 659                                                 var newdis = endpoint;
 660                                                 if (candidate == null || candidate.FilterPriority < newdis.FilterPriority)
 661                                                         candidate = newdis;
 662                                                 else if (candidate.FilterPriority == newdis.FilterPriority)
 663                                                         throw new MultipleFilterMatchesException ();
 664                                         }
 665                                 }
 666                                 if (candidate == null && !hasEndpointMatch) {
 667                                         if (owner.Host != null)
 668                                                 owner.Host.OnUnknownMessageReceived (message);
 669                                         // we have to return a fault to the client anyways...
 670                                         throw new EndpointNotFoundException ();
 671                                 }
 672                                 else if (candidate == null)
 673                                         // FIXME: It is not a good place to check, but anyways detach this error from EndpointNotFoundException.
 674                                         throw new ActionNotSupportedException (String.Format ("Action '{0}' did not match any operations in the target contract", message.Headers.Action));
 675
 676                                 return candidate;
 677                         }
 678                 }
 679 }