MsmqHostedTransportManager.cs source code in C# .NET

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                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / cdf / src / WCF / System.ServiceModel.Activation / System / ServiceModel / Channels / MsmqHostedTransportManager.cs / 1305376 / MsmqHostedTransportManager.cs
                        
                        
                            //---------------------------------------------------------------------------- 
// Copyright (c) Microsoft Corporation.  All rights reserved.
//---------------------------------------------------------------------------

namespace System.ServiceModel.Channels 
{
    using System.Collections.Generic; 
    using System.Runtime; 
    using System.ServiceModel;
    using System.ServiceModel.Activation; 
    using System.Threading;
    using System.Web;
    using System.Web.Hosting;
 
    class MsmqHostedTransportManager : TransportManager
    { 
        string[] hosts; 
        List bindingMonitors;
        HostedBindingFilter filter; 
        MsmqUri.IAddressTranslator addressing;
        Action messageReceivedCallback;

        public MsmqHostedTransportManager(string[] hosts, MsmqUri.IAddressTranslator addressing) 
        {
            this.hosts = hosts; 
            this.bindingMonitors = new List(); 
            this.addressing = addressing;
            this.filter = new HostedBindingFilter(HostingEnvironment.ApplicationVirtualPath, addressing); 

            foreach(string host in this.hosts)
            {
                MsmqBindingMonitor monitor = new MsmqBindingMonitor(host); 
                monitor.AddFilter(this.filter);
 
                this.bindingMonitors.Add(monitor); 
            }
 
            foreach(MsmqBindingMonitor monitor in this.bindingMonitors)
            {
                monitor.Open();
            } 
        }
 
        public Uri[] GetBaseAddresses(string virtualPath) 
        {
            // Make sure this is not called until initialization is done: 
            foreach(MsmqBindingMonitor monitor in this.bindingMonitors)
            {
                monitor.WaitForFirstRoundComplete();
            } 

            string absoluteVirtualPath = VirtualPathUtility.ToAbsolute(virtualPath, HostingEnvironment.ApplicationVirtualPath); 
 
            List baseAddresses = new List(this.hosts.Length);
            string queueName = absoluteVirtualPath.Substring(1); 

            foreach(string host in this.hosts)
            {
                bool isPrivate = this.filter.IsPrivateMatch(queueName); 

                Uri uri = this.addressing.CreateUri(host, queueName, isPrivate); 
                baseAddresses.Add(uri); 
                MsmqDiagnostics.FoundBaseAddress(uri, absoluteVirtualPath);
            } 
            return baseAddresses.ToArray();
        }

        internal override string Scheme 
        {
            get { return this.addressing.Scheme; } 
        } 

        internal override void OnClose(TimeSpan timeout) 
        {
            // Nothing to do - we never use the transport manager during normal
            // operation.
        } 

        internal override void OnOpen() 
        { 
            // Nothing to do - we only use the transport manager for WebHosted case.
        } 

        internal override void Register(TransportChannelListener channelListener)
        {
            channelListener.SetMessageReceivedCallback(new Action(OnMessageReceived)); 
        }
 
        internal void Start(Action messageReceivedCallback) 
        {
            this.messageReceivedCallback = messageReceivedCallback; 
        }

        internal override void Unregister(TransportChannelListener channelListener)
        { 
            // Nothing to do - we never use the transport manager during normal
            // operation. 
        } 

        void OnMessageReceived() 
        {
            Action callback = this.messageReceivedCallback;
            if (callback != null)
            { 
                callback();
            } 
        } 

        class HostedBindingFilter : MsmqBindingFilter 
        {
            Dictionary privateMatches = new Dictionary(StringComparer.OrdinalIgnoreCase);

            public HostedBindingFilter(string path, MsmqUri.IAddressTranslator addressing) 
              : base(path, addressing)
            { 
            } 

            public override object MatchFound(string host, string name, bool isPrivate) 
            {
                string processedVirtualPath = CreateRelativeVirtualPath(host, name, isPrivate);
                string relativeServiceFile = ServiceHostingEnvironment.NormalizeVirtualPath(processedVirtualPath);
 
                // Compute the remainder path:
                lock(this) 
                { 
                    if(isPrivate)
                    { 
                        string baseQueue = CreateBaseQueue(relativeServiceFile);
                        this.privateMatches[baseQueue] = baseQueue;
                    }
                } 

                // Start the service on a different thread so we can complete 
                // initialization 
                if(CheckServiceExists(relativeServiceFile))
                { 
                    MsmqDiagnostics.StartingService(host, name, isPrivate, processedVirtualPath);
                    ActionItem.Schedule(StartService, processedVirtualPath);
                }
 
                // no callback state here...
                return null; 
            } 

            public bool IsPrivateMatch(string processedVirtualPath) 
            {
                lock(this)
                {
                    return this.privateMatches.ContainsKey(processedVirtualPath); 
                }
            } 
 
            public override void MatchLost(string host, string name, bool isPrivate, object callbackState)
            { 
                // We don't do anything here - the service will stay alive,
                // and if the queue ever comes back, then it will begin to
                // process again.
            } 

            string CreateRelativeVirtualPath(string host, string name, bool isPrivate) 
            { 
                // the canonical prefix looks something like: "invoices/"
                // Because the queue name matched, it looks like "invoices/..." 
                // remove the common piece, and prefix with the "~/" home specifier
                return "~/" + name.Substring(CanonicalPrefix.Length);
            }
 
            string CreateBaseQueue(string serviceFile)
            { 
                // Clean up the service file... 
                if(serviceFile.StartsWith("~", StringComparison.OrdinalIgnoreCase))
                    serviceFile = serviceFile.Substring(1); 
                if(serviceFile.StartsWith("/", StringComparison.OrdinalIgnoreCase))
                    serviceFile = serviceFile.Substring(1);

                string virtualPath = HostingEnvironment.ApplicationVirtualPath; 
                if(virtualPath.EndsWith("/", StringComparison.OrdinalIgnoreCase))
                    virtualPath = virtualPath.Substring(0, virtualPath.Length-1); 
                if(virtualPath.StartsWith("/", StringComparison.OrdinalIgnoreCase)) 
                    virtualPath = virtualPath.Substring(1);
 
                return virtualPath + "/" + serviceFile;
            }

            bool CheckServiceExists(string serviceFile) 
            {
                try 
                { 
                    return (ServiceHostingEnvironment.IsConfigurationBasedService(serviceFile) ||
                        HostingEnvironmentWrapper.ServiceFileExists(serviceFile)); 
                }
                catch(ArgumentException ex)
                {
                    MsmqDiagnostics.ExpectedException(ex); 
                    return false;
                } 
            } 

            void StartService(object state) 
            {
                try
                {
                    string processedVirtualPath = (string)state; 
                    ServiceHostingEnvironment.EnsureServiceAvailable(processedVirtualPath);
                } 
                catch(ServiceActivationException e) 
                {
                    // Non-fatal exceptions from the user code are wrapped in ServiceActivationException 
                    // The best we can do is to trace them
                    MsmqDiagnostics.ExpectedException(e);
                }
                catch(EndpointNotFoundException e) 
                {
                    // This means that the server disappeared between the time we 
                    // saw the service, and the time we tried to start it. 
                    // That's okay.
                    MsmqDiagnostics.ExpectedException(e); 
                }
            }
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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MsmqHostedTransportManager.cs source code in C# .NET

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