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/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / clr / src / BCL / System / Runtime / Remoting / ChannelSinkStacks.cs / 1 / ChannelSinkStacks.cs
// ==++== // // Copyright (c) Microsoft Corporation. All rights reserved. // // ==--== /*============================================================ ** ** File: ChannelSinkStacks.cs ** ** Purpose: Defines the stack interfaces. ** ** ===========================================================*/ using System; using System.Collections; using System.IO; using System.Reflection; using System.Runtime.Remoting; using System.Runtime.Remoting.Messaging; using System.Runtime.Remoting.Metadata; using System.Security.Permissions; namespace System.Runtime.Remoting.Channels { // interface for maintaining the sink stack // The formatter sink MUST provide this object. // No other sinks should have to check to see if this is null. [System.Runtime.InteropServices.ComVisible(true)] public interface IClientChannelSinkStack : IClientResponseChannelSinkStack { // Push a sink to the stack (it will be called on the way back to get // the response stream). [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void Push(IClientChannelSink sink, Object state); // Retrieve state previously pushed by sink. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] Object Pop(IClientChannelSink sink); } // IChannelSinkStack [System.Runtime.InteropServices.ComVisible(true)] public interface IClientResponseChannelSinkStack { // Call AsyncProcessResponse (on previous channel sink) [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void AsyncProcessResponse(ITransportHeaders headers, Stream stream); // Called by client formatter sink in AsyncProcessResponse once it has // deserialized the response message. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void DispatchReplyMessage(IMessage msg); // If an exception happens on the async channel sink path, the // sink should call this method with the exception. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void DispatchException(Exception e); } // interface IClientResponseChannelSinkStack [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] [System.Runtime.InteropServices.ComVisible(true)] public class ClientChannelSinkStack : IClientChannelSinkStack { private class SinkStack { public SinkStack PrevStack; public IClientChannelSink Sink; public Object State; } private SinkStack _stack = null; private IMessageSink _replySink = null; public ClientChannelSinkStack() { } // use this constructor when initiating an async call public ClientChannelSinkStack(IMessageSink replySink) { _replySink = replySink; } public void Push(IClientChannelSink sink, Object state) { SinkStack newStack = new SinkStack(); newStack.PrevStack = _stack; newStack.Sink = sink; newStack.State = state; _stack = newStack; } // Push // retrieve state previously pushed by sink public Object Pop(IClientChannelSink sink) { if (_stack == null) { throw new RemotingException( Environment.GetResourceString("Remoting_Channel_PopOnEmptySinkStack")); } // find this sink on the stack do { if (_stack.Sink == sink) break; _stack = _stack.PrevStack; } while (_stack != null); if (_stack.Sink == null) { throw new RemotingException( Environment.GetResourceString("Remoting_Channel_PopFromSinkStackWithoutPush")); } Object state = _stack.State; _stack = _stack.PrevStack; return state; } // Pop public void AsyncProcessResponse(ITransportHeaders headers, Stream stream) { // If the reply sink is null, this is a one way message, so we're not // going to process the reply path. if (_replySink != null) { if (_stack == null) { throw new RemotingException( Environment.GetResourceString( "Remoting_Channel_CantCallAPRWhenStackEmpty")); } IClientChannelSink sink = _stack.Sink; Object state = _stack.State; _stack = _stack.PrevStack; sink.AsyncProcessResponse(this, state, headers, stream); } } // AsyncProcessResponse // Client formatter sink should call this in AysncProcessResponse once // it has deserialized a message. public void DispatchReplyMessage(IMessage msg) { if (_replySink != null) _replySink.SyncProcessMessage(msg); } // DispatchReplyMessage public void DispatchException(Exception e) { DispatchReplyMessage(new ReturnMessage(e, null)); } // DispatchException } // ClientChannelSinkStack // interface for maintaining the sink stack // The transport sink MUST provide this object. // No other sinks should have to check to see if this is null. [System.Runtime.InteropServices.ComVisible(true)] public interface IServerChannelSinkStack : IServerResponseChannelSinkStack { // Push a sink to the stack (it will be called on the way back to get // the response stream). [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void Push(IServerChannelSink sink, Object state); // Retrieve state previously pushed by sink. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] Object Pop(IServerChannelSink sink); ///// IMPORTANT: If a sink did a Push(), it must do a Pop() // before calling GetResponseStream inside of ProcessMessage. // On the way back, if it is determined that a asynchronous processing is // needed, a sink should call Store() instead of Pop() [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void Store(IServerChannelSink sink, Object state); /// // Called by the server transport sink to complete the dispatch, if async // processing is being used. [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void StoreAndDispatch(IServerChannelSink sink, Object state); /// // handles callback after message has been dispatched asynchronously [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void ServerCallback(IAsyncResult ar); } // IServerChannelSinkStack [System.Runtime.InteropServices.ComVisible(true)] public interface IServerResponseChannelSinkStack { /// // Call AsyncProcessResponse (on previous channel sink) [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] void AsyncProcessResponse(IMessage msg, ITransportHeaders headers, Stream stream); // Call GetResponseStream (on previous channel sink) [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] Stream GetResponseStream(IMessage msg, ITransportHeaders headers); } // interface IServerResponseChannelSinkStack [SecurityPermissionAttribute(SecurityAction.LinkDemand, Flags=SecurityPermissionFlag.Infrastructure)] [System.Runtime.InteropServices.ComVisible(true)] public class ServerChannelSinkStack : IServerChannelSinkStack { private class SinkStack { public SinkStack PrevStack; public IServerChannelSink Sink; public Object State; } private SinkStack _stack = null; private SinkStack _rememberedStack = null; // async callback support private IMessage _asyncMsg = null; private MethodInfo _asyncEnd = null; private Object _serverObject = null; private IMethodCallMessage _msg = null; public void Push(IServerChannelSink sink, Object state) { SinkStack newStack = new SinkStack(); newStack.PrevStack = _stack; newStack.Sink = sink; newStack.State = state; _stack = newStack; } // Push public Object Pop(IServerChannelSink sink) { if (_stack == null) { throw new RemotingException( Environment.GetResourceString("Remoting_Channel_PopOnEmptySinkStack")); } // find this sink on the stack do { if (_stack.Sink == sink) break; _stack = _stack.PrevStack; } while (_stack != null); if (_stack.Sink == null) { throw new RemotingException( Environment.GetResourceString("Remoting_Channel_PopFromSinkStackWithoutPush")); } Object state = _stack.State; _stack = _stack.PrevStack; return state; } // Pop public void Store(IServerChannelSink sink, Object state) { if (_stack == null) { throw new RemotingException( Environment.GetResourceString( "Remoting_Channel_StoreOnEmptySinkStack")); } // find this sink on the stack do { if (_stack.Sink == sink) break; _stack = _stack.PrevStack; } while (_stack != null); if (_stack.Sink == null) { throw new RemotingException( Environment.GetResourceString("Remoting_Channel_StoreOnSinkStackWithoutPush")); } SinkStack remStack = new SinkStack(); remStack.PrevStack = _rememberedStack; remStack.Sink = sink; remStack.State = state; _rememberedStack = remStack; Pop(sink); } // Store public void StoreAndDispatch(IServerChannelSink sink, Object state) { Store(sink, state); FlipRememberedStack(); CrossContextChannel.DoAsyncDispatch(_asyncMsg, null); } // Store // Reverses remebered stack so that return message may be dispatched. private void FlipRememberedStack() { if (_stack != null) throw new RemotingException( Environment.GetResourceString( "Remoting_Channel_CantCallFRSWhenStackEmtpy")); while (_rememberedStack != null) { SinkStack newStack = new SinkStack(); newStack.PrevStack = _stack; newStack.Sink = _rememberedStack.Sink; newStack.State = _rememberedStack.State; _stack = newStack; _rememberedStack = _rememberedStack.PrevStack; } } // FlipRememberedStack public void AsyncProcessResponse(IMessage msg, ITransportHeaders headers, Stream stream) { if (_stack == null) { throw new RemotingException( Environment.GetResourceString( "Remoting_Channel_CantCallAPRWhenStackEmpty")); } IServerChannelSink sink = _stack.Sink; Object state = _stack.State; _stack = _stack.PrevStack; sink.AsyncProcessResponse(this, state, msg, headers, stream); } // AsyncProcessResponse public Stream GetResponseStream(IMessage msg, ITransportHeaders headers) { if (_stack == null) { throw new RemotingException( Environment.GetResourceString( "Remoting_Channel_CantCallGetResponseStreamWhenStackEmpty")); } // save state IServerChannelSink savedSink = _stack.Sink; Object savedState = _stack.State; _stack = _stack.PrevStack; Stream stream = savedSink.GetResponseStream(this, savedState, msg, headers); // restore state Push(savedSink, savedState); return stream; } // GetResponseStream // Store server that is going to be called back internal Object ServerObject { set { _serverObject = value; } } public void ServerCallback(IAsyncResult ar) { if (_asyncEnd != null) { RemotingMethodCachedData asyncEndCache = (RemotingMethodCachedData) InternalRemotingServices.GetReflectionCachedData(_asyncEnd); MethodInfo syncMI = (MethodInfo)_msg.MethodBase; RemotingMethodCachedData syncCache = (RemotingMethodCachedData) InternalRemotingServices.GetReflectionCachedData(syncMI); ParameterInfo[] paramList = asyncEndCache.Parameters; // construct list to pass into End Object[] parameters = new Object[paramList.Length]; parameters[paramList.Length - 1] = ar; // last parameter is the async result Object[] syncMsgArgs = _msg.Args; // copy out and ref parameters to the parameters list AsyncMessageHelper.GetOutArgs(syncCache.Parameters, syncMsgArgs, parameters); Object[] outArgs; StackBuilderSink s = new StackBuilderSink(_serverObject); Object returnValue = s.PrivateProcessMessage(_asyncEnd.MethodHandle, System.Runtime.Remoting.Messaging.Message.CoerceArgs(_asyncEnd, parameters, paramList), _serverObject, 0, false, out outArgs); // The outArgs list is associated with the EndXXX method. We need to make sure // it is sized properly for the out args of the XXX method. if (outArgs != null) outArgs = ArgMapper.ExpandAsyncEndArgsToSyncArgs(syncCache, outArgs); s.CopyNonByrefOutArgsFromOriginalArgs(syncCache, syncMsgArgs, ref outArgs); IMessage retMessage = new ReturnMessage( returnValue, outArgs, _msg.ArgCount, CallContext.GetLogicalCallContext(), _msg); AsyncProcessResponse(retMessage, null, null); } } // ServerCallback } // ServerChannelSinkStack // helper class for transforming sync message parameter lists into its // async counterparts internal static class AsyncMessageHelper { internal static void GetOutArgs(ParameterInfo[] syncParams, Object[] syncArgs, Object[] endArgs) { int outCount = 0; for (int co = 0; co < syncParams.Length; co++) { if (syncParams[co].IsOut || syncParams[co].ParameterType.IsByRef) { endArgs[outCount++] = syncArgs[co]; } } } // GetOutArgs } // AsyncMessageHelper } // namespace System.Runtime.Remoting.Channels
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