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