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 using System;
  10 using System.Threading;
  11 using System.Runtime.Remoting.Messaging;
  12 using System.Runtime.Remoting.Activation;
  13 using System.Runtime.Remoting.Contexts;
  14 using System.Runtime.Remoting.Proxies;
  15 using System.Reflection;
  16 using System.Runtime.CompilerServices;
  17 using System.Collections;
  18 using System.Runtime.Remoting.Channels;
  19
  20 namespace System.Runtime.Remoting.Activation
  21 {
  22         internal class ActivationServices
  23         {
  24                 static IActivator _constructionActivator = new ConstructionLevelActivator ();
  25
  26                 public static IMessage Activate (RemotingProxy proxy, ConstructionCall ctorCall)
  27                 {
  28                         IMessage response;
  29
  30                         if (Thread.CurrentContext.HasExitSinks && !ctorCall.IsContextOk)
  31                                 response = Thread.CurrentContext.GetClientContextSinkChain ().SyncProcessMessage (ctorCall);
  32                         else
  33                                 response = RemoteActivate (ctorCall);
  34
  35                         if (response is IConstructionReturnMessage)
  36                         {
  37                                 Identity identity = RemotingServices.GetMessageTargetIdentity (ctorCall);
  38                                 proxy.AttachIdentity (identity);
  39                         }
  40
  41                         return response;
  42                 }
  43
  44                 public static IMessage RemoteActivate (IConstructionCallMessage ctorCall)
  45                 {
  46                         try \r
  47                         {
  48                                 return ctorCall.Activator.Activate (ctorCall);
  49                         }
  50                         catch (Exception ex) \r
  51                         {
  52                                 return new ReturnMessage (ex, ctorCall);
  53                         }               \r
  54                 }
  55
  56                 public static object CreateProxyFromAttributes (Type type, object[] activationAttributes)
  57                 {
  58                         string activationUrl = null;
  59                         foreach (object attr in activationAttributes)
  60                         {
  61                                 if (!(attr is IContextAttribute)) throw new RemotingException ("Activation attribute does not implement the IContextAttribute interface");
  62                                 if (attr is UrlAttribute) activationUrl = ((UrlAttribute)attr).UrlValue;
  63                         }
  64
  65                         if (activationUrl != null)
  66                                 return RemotingServices.CreateClientProxy (type, activationUrl, activationAttributes);
  67
  68                         ActivatedClientTypeEntry activatedEntry = RemotingConfiguration.IsRemotelyActivatedClientType (type);
  69                         if (activatedEntry != null)
  70                                 return RemotingServices.CreateClientProxy (activatedEntry, activationAttributes);
  71
  72                         if (type.IsContextful)
  73                                 return RemotingServices.CreateClientProxyForContextBound (type, activationAttributes);
  74
  75                         return null;
  76                 }
  77
  78                 public static ConstructionCall CreateConstructionCall (Type type, string activationUrl, object[] activationAttributes)
  79                 {
  80                         ConstructionCall ctorCall = new ConstructionCall (type);
  81
  82                         if (!type.IsContextful)
  83                         {
  84                                 // Must be a remote activated object
  85                                 ctorCall.Activator = new AppDomainLevelActivator (activationUrl, _constructionActivator);
  86                                 ctorCall.IsContextOk = false;   // It'll be activated in a remote context
  87                                 return ctorCall;
  88                         }
  89
  90                         // It is a CBO. Need collect context properties and
  91                         // check if a new context is needed.
  92
  93                         IActivator activatorChain = _constructionActivator;
  94                         activatorChain = new ContextLevelActivator (activatorChain);
  95
  96                         ArrayList attributes = new ArrayList ();
  97                         if (activationAttributes != null) attributes.AddRange (activationAttributes);
  98
  99                         bool isContextOk = (activationUrl == ChannelServices.CrossContextUrl);  // Remote CBOs are always created in a new context
 100                         Context currentContext = Threading.Thread.CurrentContext;
 101
 102                         if (isContextOk)
 103                         {
 104                                 foreach (IContextAttribute attr in attributes)
 105                                 {
 106                                         if (!attr.IsContextOK (currentContext, ctorCall))
 107                                         {
 108                                                 isContextOk = false;
 109                                                 break;
 110                                         }
 111                                 }
 112                         }
 113
 114                         object[] typeAttributes = type.GetCustomAttributes (true);
 115                         foreach (object attr in typeAttributes)
 116                         {
 117                                 if (attr is IContextAttribute)
 118                                 {
 119                                         isContextOk = isContextOk && ((IContextAttribute)attr).IsContextOK (currentContext, ctorCall);
 120                                         attributes.Add (attr);
 121                                 }
 122                         }
 123
 124                         if (!isContextOk)
 125                         {
 126                                 // A new context is needed. Collect the context properties and chain
 127                                 // the context level activator.
 128
 129                                 ctorCall.SetActivationAttributes (attributes.ToArray());
 130
 131                                 foreach (IContextAttribute attr in attributes)
 132                                         attr.GetPropertiesForNewContext (ctorCall);
 133                         }
 134
 135                         if (activationUrl != ChannelServices.CrossContextUrl)
 136                                 activatorChain = new AppDomainLevelActivator (activationUrl, activatorChain);
 137
 138                         ctorCall.Activator = activatorChain;
 139                         ctorCall.IsContextOk = isContextOk;
 140
 141                         return ctorCall;
 142                 }
 143
 144                 public static IMessage CreateInstanceFromMessage (IConstructionCallMessage ctorCall)
 145                 {
 146                         object obj = AllocateUninitializedClassInstance (ctorCall.ActivationType);
 147                         ctorCall.MethodBase.Invoke (obj, ctorCall.Args);
 148
 149                         ServerIdentity identity = (ServerIdentity) RemotingServices.GetMessageTargetIdentity (ctorCall);
 150
 151                         identity.AttachServerObject ((MarshalByRefObject) obj, Threading.Thread.CurrentContext);
 152
 153                         return new ConstructionResponse (obj, null, ctorCall);
 154                 }
 155
 156                 public static object CreateProxyForType (Type type)
 157                 {
 158                         // Called by the runtime when creating an instance of a type
 159                         // that has been registered as remotely activated.
 160
 161                         // First of all check for remote activation. If the object is not remote, then
 162                         // it may be contextbound.
 163
 164                         ActivatedClientTypeEntry activatedEntry = RemotingConfiguration.IsRemotelyActivatedClientType (type);
 165                         if (activatedEntry != null)
 166                                 return RemotingServices.CreateClientProxy (activatedEntry, null);
 167
 168                         WellKnownClientTypeEntry wellknownEntry = RemotingConfiguration.IsWellKnownClientType (type);
 169                         if (wellknownEntry != null)
 170                                 return RemotingServices.CreateClientProxy (wellknownEntry);
 171
 172                         if (type.IsContextful)
 173                                 return RemotingServices.CreateClientProxyForContextBound (type, null);
 174
 175                         return null;
 176                 }
 177
 178                 // Allocates an uninitialized instance. It never creates proxies.
 179                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 180                 public static extern object AllocateUninitializedClassInstance (Type type);
 181
 182                 [MethodImplAttribute(MethodImplOptions.InternalCall)]
 183                 public extern static void EnableProxyActivation (Type type, bool enable);
 184         }
 185 }