mcs/class/corlib/System.Runtime.Remoting.Activation/ActivationServices.cs

   1 //
   2 // System.Runtime.Remoting.ActivationServices.cs
   3 //
   4 // Author: Lluis Sanchez Gual (lluis@ideary.com)
   5 //
   6 // (C) 2002, Lluis Sanchez Gual
   7 //
   8
   9 //
  10 // Copyright (C) 2004 Novell, Inc (http://www.novell.com)
  11 //
  12 // Permission is hereby granted, free of charge, to any person obtaining
  13 // a copy of this software and associated documentation files (the
  14 // "Software"), to deal in the Software without restriction, including
  15 // without limitation the rights to use, copy, modify, merge, publish,
  16 // distribute, sublicense, and/or sell copies of the Software, and to
  17 // permit persons to whom the Software is furnished to do so, subject to
  18 // the following conditions:
  19 //
  20 // The above copyright notice and this permission notice shall be
  21 // included in all copies or substantial portions of the Software.
  22 //
  23 // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  24 // EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  25 // MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  26 // NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
  27 // LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
  28 // OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
  29 // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  30 //
  31
  32 using System;
  33 using System.Threading;
  34 using System.Runtime.Remoting.Messaging;
  35 using System.Runtime.Remoting.Activation;
  36 using System.Runtime.Remoting.Contexts;
  37 using System.Runtime.Remoting.Proxies;
  38 using System.Reflection;
  39 using System.Runtime.CompilerServices;
  40 using System.Collections;
  41 using System.Runtime.Remoting.Channels;
  42
  43 namespace System.Runtime.Remoting.Activation
  44 {
  45         internal class ActivationServices
  46         {
  47                 static IActivator _constructionActivator;
  48
  49                 static IActivator ConstructionActivator {
  50                         get {
  51                                 if (_constructionActivator == null)
  52                                         _constructionActivator = new ConstructionLevelActivator ();
  53
  54                                 return _constructionActivator;
  55                         }
  56                 }
  57
  58                 public static IMessage Activate (RemotingProxy proxy, ConstructionCall ctorCall)
  59                 {
  60                         IMessage response;
  61                         ctorCall.SourceProxy = proxy;
  62
  63                         if (Thread.CurrentContext.HasExitSinks && !ctorCall.IsContextOk)
  64                                 response = Thread.CurrentContext.GetClientContextSinkChain ().SyncProcessMessage (ctorCall);
  65                         else
  66                                 response = RemoteActivate (ctorCall);
  67
  68                         if (response is IConstructionReturnMessage && ((IConstructionReturnMessage)response).Exception == null && proxy.ObjectIdentity == null)
  69                         {
  70                                 Identity identity = RemotingServices.GetMessageTargetIdentity (ctorCall);
  71                                 proxy.AttachIdentity (identity);
  72                         }
  73
  74                         return response;
  75                 }
  76
  77                 public static IMessage RemoteActivate (IConstructionCallMessage ctorCall)
  78                 {
  79                         try
  80                         {
  81                                 return ctorCall.Activator.Activate (ctorCall);
  82                         }
  83                         catch (Exception ex)
  84                         {
  85                                 return new ReturnMessage (ex, ctorCall);
  86                         }
  87                 }
  88
  89                 public static object CreateProxyFromAttributes (Type type, object[] activationAttributes)
  90                 {
  91                         string activationUrl = null;
  92                         foreach (object attr in activationAttributes)
  93                         {
  94                                 if (!(attr is IContextAttribute)) throw new RemotingException ("Activation attribute does not implement the IContextAttribute interface");
  95                                 if (attr is UrlAttribute) activationUrl = ((UrlAttribute)attr).UrlValue;
  96                         }
  97
  98                         if (activationUrl != null)
  99                                 return RemotingServices.CreateClientProxy (type, activationUrl, activationAttributes);
 100
 101                         ActivatedClientTypeEntry activatedEntry = RemotingConfiguration.IsRemotelyActivatedClientType (type);
 102                         if (activatedEntry != null)
 103                                 return RemotingServices.CreateClientProxy (activatedEntry, activationAttributes);
 104
 105                         if (type.IsContextful)
 106                                 return RemotingServices.CreateClientProxyForContextBound (type, activationAttributes);
 107
 108                         return null;
 109                 }
 110
 111                 public static ConstructionCall CreateConstructionCall (Type type, string activationUrl, object[] activationAttributes)
 112                 {
 113                         ConstructionCall ctorCall = new ConstructionCall (type);
 114
 115                         if (!type.IsContextful)
 116                         {
 117                                 // Must be a remote activated object
 118                                 ctorCall.Activator = new AppDomainLevelActivator (activationUrl, ConstructionActivator);
 119                                 ctorCall.IsContextOk = false;   // It'll be activated in a remote context
 120                                 return ctorCall;
 121                         }
 122
 123                         // It is a CBO. Need collect context properties and
 124                         // check if a new context is needed.
 125
 126                         IActivator activatorChain = ConstructionActivator;
 127                         activatorChain = new ContextLevelActivator (activatorChain);
 128
 129                         ArrayList attributes = new ArrayList ();
 130                         if (activationAttributes != null) attributes.AddRange (activationAttributes);
 131
 132                         bool isContextOk = (activationUrl == ChannelServices.CrossContextUrl);  // Remote CBOs are always created in a new context
 133                         Context currentContext = Threading.Thread.CurrentContext;
 134
 135                         if (isContextOk)
 136                         {
 137                                 foreach (IContextAttribute attr in attributes)
 138                                 {
 139                                         if (!attr.IsContextOK (currentContext, ctorCall))
 140                                         {
 141                                                 isContextOk = false;
 142                                                 break;
 143                                         }
 144                                 }
 145                         }
 146
 147                         object[] typeAttributes = type.GetCustomAttributes (true);
 148                         foreach (object attr in typeAttributes)
 149                         {
 150                                 if (attr is IContextAttribute)
 151                                 {
 152                                         isContextOk = isContextOk && ((IContextAttribute)attr).IsContextOK (currentContext, ctorCall);
 153                                         attributes.Add (attr);
 154                                 }
 155                         }
 156
 157                         if (!isContextOk)
 158                         {
 159                                 // A new context is needed. Collect the context properties and chain
 160                                 // the context level activator.
 161
 162                                 ctorCall.SetActivationAttributes (attributes.ToArray());
 163
 164                                 foreach (IContextAttribute attr in attributes)
 165                                         attr.GetPropertiesForNewContext (ctorCall);
 166                         }
 167
 168                         if (activationUrl != ChannelServices.CrossContextUrl)
 169                                 activatorChain = new AppDomainLevelActivator (activationUrl, activatorChain);
 170
 171                         ctorCall.Activator = activatorChain;
 172                         ctorCall.IsContextOk = isContextOk;
 173
 174                         return ctorCall;
 175                 }
 176
 177                 public static IMessage CreateInstanceFromMessage (IConstructionCallMessage ctorCall)
 178                 {
 179                         object obj = AllocateUninitializedClassInstance (ctorCall.ActivationType);
 180
 181                         ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (ctorCall);
 182                         identity.AttachServerObject ((MarshalByRefObject) obj, Threading.Thread.CurrentContext);
 183
 184                         ConstructionCall call = ctorCall as ConstructionCall;
 185
 186                         if (ctorCall.ActivationType.IsContextful && call != null && call.SourceProxy != null)
 187                         {
 188                                 call.SourceProxy.AttachIdentity (identity);
 189                                 MarshalByRefObject target = (MarshalByRefObject) call.SourceProxy.GetTransparentProxy ();
 190                                 RemotingServices.InternalExecuteMessage (target, ctorCall);
 191                         }
 192                         else
 193                                 ctorCall.MethodBase.Invoke (obj, ctorCall.Args);
 194
 195                         return new ConstructionResponse (obj, null, ctorCall);
 196                 }
 197
 198                 public static object CreateProxyForType (Type type)
 199                 {
 200                         // Called by the runtime when creating an instance of a type
 201                         // that has been registered as remotely activated.
 202
 203                         // First of all check for remote activation. If the object is not remote, then
 204                         // it may be contextbound.
 205
 206                         ActivatedClientTypeEntry activatedEntry = RemotingConfiguration.IsRemotelyActivatedClientType (type);
 207                         if (activatedEntry != null)
 208                                 return RemotingServices.CreateClientProxy (activatedEntry, null);
 209
 210                         WellKnownClientTypeEntry wellknownEntry = RemotingConfiguration.IsWellKnownClientType (type);
 211                         if (wellknownEntry != null)
 212                                 return RemotingServices.CreateClientProxy (wellknownEntry);
 213
 214                         if (type.IsContextful)
 215                                 return RemotingServices.CreateClientProxyForContextBound (type, null);
 216 #if !MOBILE
 217                         if (type.IsCOMObject) {
 218                                 return RemotingServices.CreateClientProxyForComInterop (type);
 219                         }
 220 #endif
 221                         return null;
 222                 }
 223
 224                 internal static void PushActivationAttributes (Type serverType, Object[] attributes)
 225                 {
 226                         // TODO:
 227                 }
 228
 229                 internal static void PopActivationAttributes (Type serverType)
 230                 {
 231                         // TODO:
 232                 }
 233
 234                 // Allocates an uninitialized instance. It never creates proxies.
 235                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 236                 public static extern object AllocateUninitializedClassInstance (Type type);
 237
 238                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 239                 public extern static void EnableProxyActivation (Type type, bool enable);
 240         }
 241 }