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CHAPTER 13 EXTENDING .NET REMOTING
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public IMessage SyncProcessMessage(IMessage msg) { if (msg as IMethodCallMessage != null) { LogicalCallContext lcc = (LogicalCallContext) msg.Properties["__CallContext"]; lcc.SetData("priority",Thread.CurrentThread.Priority); return _nextMsgSink.SyncProcessMessage(msg); } else { return _nextMsgSink.SyncProcessMessage(msg); } } The same has to be done for AsyncProcessMessage() as well. public IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink) { if (msg as IMethodCallMessage != null) { LogicalCallContext lcc = (LogicalCallContext) msg.Properties["__CallContext"]; lcc.SetData("priority",Thread.CurrentThread.Priority); return _nextMsgSink.AsyncProcessMessage(msg,replySink); } else { return _nextMsgSink.AsyncProcessMessage(msg,replySink); } } On the server side, you have to implement an IServerChannelSink to take the call context from the IMessage object and set Thread.CurrentThread.Priority to the contained value. public ServerProcessing ProcessMessage(IServerChannelSinkStack sinkStack, IMessage requestMsg, ITransportHeaders requestHeaders, Stream requestStream, out IMessage responseMsg, out ITransportHeaders responseHeaders, out Stream responseStream) { LogicalCallContext lcc = (LogicalCallContext) requestMsg.Properties["__CallContext"]; // storing the current priority ThreadPriority oldprio = Thread.CurrentThread.Priority;
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// check if the logical call context contains "priority" if (lcc != null && lcc.GetData("priority") != null) { // fetch the priority from the call context ThreadPriority priority = (ThreadPriority) lcc.GetData("priority"); Console.WriteLine(" -> Pre-execution priority change {0} to {1}", oldprio.ToString(),priority.ToString()); // set the priority Thread.CurrentThread.Priority = priority; }
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// push on the stack and pass the call to the next sink // the old priority will be used as "state" for the response sinkStack.Push(this,oldprio); ServerProcessing spres = _next.ProcessMessage (sinkStack, requestMsg, requestHeaders, requestStream, out responseMsg,out responseHeaders,out responseStream); // restore priority if call is not asynchronous if (spres != ServerProcessing.Async) { if (lcc != null && lcc.GetData("priority") != null) { Console.WriteLine(" -> Post-execution change back to {0}",oldprio); Thread.CurrentThread.Priority = oldprio; } } return spres; } The sink provider for the server-side sink is quite straightforward. It looks more or less the same as those for the previous IServerChannelSinks. On the client side, some minor inconveniences stem from this approach. Remember that you implemented an IMessageSink and not an IClientChannelSink in this case. Looking for an IMessageSinkProvider will not give you any results, so you ll have to implement an IClientChannelSink provider in this case as well even though the sink is in reality an IMessageSink. The problem with this can be seen when looking at the following part of the IClientChannelSinkProvider interface:
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IClientChannelSink CreateSink(IChannelSender channel, string url, object remoteChannelData); This indicates CreateSink() has to return an IClientChannelSink in any case, even if your sink only needs to implement IMessageSink. You now have to extend your IMessageSink to implement IClientChannelSink as well. You also have to use caution because IClientChannelSink defines more methods that have to be implemented. Those methods are called when the sink is used as a channel sink (that is, after the formatter) and not as a message sink. You might not want to allow your users to position the sink after the formatter (because it wouldn t work there because it s changing the IMessage object s content), so you want to throw exceptions in those methods. The complete client-side PriorityEmitterSink, which throws those exceptions when used in the wrong sequence, is shown in Listing 13-12. Listing 13-12. The Complete PriorityEmitterSink using using using using using using using System; System.Collections; System.IO; System.Runtime.Remoting; System.Runtime.Remoting.Channels; System.Runtime.Remoting.Messaging; System.Threading;
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namespace PrioritySinks { public class PriorityEmitterSink : BaseChannelObjectWithProperties, IClientChannelSink, IMessageSink { private IMessageSink _nextMsgSink; public IMessageCtrl AsyncProcessMessage(IMessage msg, IMessageSink replySink) { // only for method calls if (msg as IMethodCallMessage != null) { LogicalCallContext lcc = (LogicalCallContext) msg.Properties["__CallContext"]; lcc.SetData("priority",Thread.CurrentThread.Priority); return _nextMsgSink.AsyncProcessMessage(msg,replySink); } else { return _nextMsgSink.AsyncProcessMessage(msg,replySink); } }
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public IMessage SyncProcessMessage(IMessage msg) { // only for method calls if (msg as IMethodCallMessage != null) { LogicalCallContext lcc = (LogicalCallContext) msg.Properties["__CallContext"]; lcc.SetData("priority",Thread.CurrentThread.Priority); return _nextMsgSink.SyncProcessMessage(msg); } else { return _nextMsgSink.SyncProcessMessage(msg); } } public PriorityEmitterSink (object next) { if (next as IMessageSink != null) { _nextMsgSink = (IMessageSink) next; } }
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public IMessageSink NextSink { get { return _nextMsgSink; } } public IClientChannelSink NextChannelSink { get { throw new RemotingException("Wrong sequence."); } } public void AsyncProcessRequest(IClientChannelSinkStack sinkStack, IMessage msg, ITransportHeaders headers, Stream stream) { throw new RemotingException("Wrong sequence."); }
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