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 = new ConstructionLevelActivator ();
  48
  49                 public static IMessage Activate (RemotingProxy proxy, ConstructionCall ctorCall)
  50                 {
  51                         IMessage response;
  52                         ctorCall.SourceProxy = proxy;
  53
  54                         if (Thread.CurrentContext.HasExitSinks && !ctorCall.IsContextOk)
  55                                 response = Thread.CurrentContext.GetClientContextSinkChain ().SyncProcessMessage (ctorCall);
  56                         else
  57                                 response = RemoteActivate (ctorCall);
  58
  59                         if (response is IConstructionReturnMessage && ((IConstructionReturnMessage)response).Exception == null && proxy.ObjectIdentity == null)
  60                         {
  61                                 Identity identity = RemotingServices.GetMessageTargetIdentity (ctorCall);
  62                                 proxy.AttachIdentity (identity);
  63                         }
  64
  65                         return response;
  66                 }
  67
  68                 public static IMessage RemoteActivate (IConstructionCallMessage ctorCall)
  69                 {
  70                         try
  71                         {
  72                                 return ctorCall.Activator.Activate (ctorCall);
  73                         }
  74                         catch (Exception ex)
  75                         {
  76                                 return new ReturnMessage (ex, ctorCall);
  77                         }
  78                 }
  79
  80                 public static object CreateProxyFromAttributes (Type type, object[] activationAttributes)
  81                 {
  82                         string activationUrl = null;
  83                         foreach (object attr in activationAttributes)
  84                         {
  85                                 if (!(attr is IContextAttribute)) throw new RemotingException ("Activation attribute does not implement the IContextAttribute interface");
  86                                 if (attr is UrlAttribute) activationUrl = ((UrlAttribute)attr).UrlValue;
  87                         }
  88
  89                         if (activationUrl != null)
  90                                 return RemotingServices.CreateClientProxy (type, activationUrl, activationAttributes);
  91
  92                         ActivatedClientTypeEntry activatedEntry = RemotingConfiguration.IsRemotelyActivatedClientType (type);
  93                         if (activatedEntry != null)
  94                                 return RemotingServices.CreateClientProxy (activatedEntry, activationAttributes);
  95
  96                         if (type.IsContextful)
  97                                 return RemotingServices.CreateClientProxyForContextBound (type, activationAttributes);
  98
  99                         return null;
 100                 }
 101
 102                 public static ConstructionCall CreateConstructionCall (Type type, string activationUrl, object[] activationAttributes)
 103                 {
 104                         ConstructionCall ctorCall = new ConstructionCall (type);
 105
 106                         if (!type.IsContextful)
 107                         {
 108                                 // Must be a remote activated object
 109                                 ctorCall.Activator = new AppDomainLevelActivator (activationUrl, _constructionActivator);
 110                                 ctorCall.IsContextOk = false;   // It'll be activated in a remote context
 111                                 return ctorCall;
 112                         }
 113
 114                         // It is a CBO. Need collect context properties and
 115                         // check if a new context is needed.
 116
 117                         IActivator activatorChain = _constructionActivator;
 118                         activatorChain = new ContextLevelActivator (activatorChain);
 119
 120                         ArrayList attributes = new ArrayList ();
 121                         if (activationAttributes != null) attributes.AddRange (activationAttributes);
 122
 123                         bool isContextOk = (activationUrl == ChannelServices.CrossContextUrl);  // Remote CBOs are always created in a new context
 124                         Context currentContext = Threading.Thread.CurrentContext;
 125
 126                         if (isContextOk)
 127                         {
 128                                 foreach (IContextAttribute attr in attributes)
 129                                 {
 130                                         if (!attr.IsContextOK (currentContext, ctorCall))
 131                                         {
 132                                                 isContextOk = false;
 133                                                 break;
 134                                         }
 135                                 }
 136                         }
 137
 138                         object[] typeAttributes = type.GetCustomAttributes (true);
 139                         foreach (object attr in typeAttributes)
 140                         {
 141                                 if (attr is IContextAttribute)
 142                                 {
 143                                         isContextOk = isContextOk && ((IContextAttribute)attr).IsContextOK (currentContext, ctorCall);
 144                                         attributes.Add (attr);
 145                                 }
 146                         }
 147
 148                         if (!isContextOk)
 149                         {
 150                                 // A new context is needed. Collect the context properties and chain
 151                                 // the context level activator.
 152
 153                                 ctorCall.SetActivationAttributes (attributes.ToArray());
 154
 155                                 foreach (IContextAttribute attr in attributes)
 156                                         attr.GetPropertiesForNewContext (ctorCall);
 157                         }
 158
 159                         if (activationUrl != ChannelServices.CrossContextUrl)
 160                                 activatorChain = new AppDomainLevelActivator (activationUrl, activatorChain);
 161
 162                         ctorCall.Activator = activatorChain;
 163                         ctorCall.IsContextOk = isContextOk;
 164
 165                         return ctorCall;
 166                 }
 167
 168                 public static IMessage CreateInstanceFromMessage (IConstructionCallMessage ctorCall)
 169                 {
 170                         object obj = AllocateUninitializedClassInstance (ctorCall.ActivationType);
 171
 172                         ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (ctorCall);
 173                         identity.AttachServerObject ((MarshalByRefObject) obj, Threading.Thread.CurrentContext);
 174
 175                         ConstructionCall call = ctorCall as ConstructionCall;
 176                         if (ctorCall.ActivationType.IsContextful && call != null && call.SourceProxy != null)
 177                         {
 178                                 call.SourceProxy.AttachIdentity (identity);
 179                                 MarshalByRefObject target = (MarshalByRefObject) call.SourceProxy.GetTransparentProxy ();
 180                                 RemotingServices.InternalExecuteMessage (target, ctorCall);
 181                         }
 182                         else
 183                                 ctorCall.MethodBase.Invoke (obj, ctorCall.Args);
 184
 185                         return new ConstructionResponse (obj, null, ctorCall);
 186                 }
 187
 188                 public static object CreateProxyForType (Type type)
 189                 {
 190                         // Called by the runtime when creating an instance of a type
 191                         // that has been registered as remotely activated.
 192
 193                         // First of all check for remote activation. If the object is not remote, then
 194                         // it may be contextbound.
 195
 196                         ActivatedClientTypeEntry activatedEntry = RemotingConfiguration.IsRemotelyActivatedClientType (type);
 197                         if (activatedEntry != null)
 198                                 return RemotingServices.CreateClientProxy (activatedEntry, null);
 199
 200                         WellKnownClientTypeEntry wellknownEntry = RemotingConfiguration.IsWellKnownClientType (type);
 201                         if (wellknownEntry != null)
 202                                 return RemotingServices.CreateClientProxy (wellknownEntry);
 203
 204                         if (type.IsContextful)
 205                                 return RemotingServices.CreateClientProxyForContextBound (type, null);
 206
 207                         return null;
 208                 }
 209
 210                 // Allocates an uninitialized instance. It never creates proxies.
 211                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 212                 public static extern object AllocateUninitializedClassInstance (Type type);
 213
 214                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 215                 public extern static void EnableProxyActivation (Type type, bool enable);
 216         }
 217 }