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POException in Publisher Subscriber model while working in WCF
 

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  1. POException in Publisher Subscriber model while working in WCF
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    <p>I have made a WCF publisher Subscriber service which handles 70 to 80 connections per day If a connection breaks in between ( due to internet connection failure , System shutdown etc.) the service itself will try to set up a connection itself when the connectivity resumes.</p> <p>sometime back I am noticed my service is throwing exceptions (operation Timed out)</p> <p><strong><code>This request operation sent to net.tcp://localhost:2001/sub did not receive a reply within the configured timeout (00:00:59.9799877). The time allotted to this operation may have been a portion of a longer timeout. This may be because the service is still processing the operation or because the service was unable to send a reply message. Please consider increasing the operation timeout (by casting the channel/proxy to IContextChannel and setting the OperationTimeout property) and ensure that the service is able to connect to the client</code></strong></p> <p>and then after some of these Exceptions RM destination time out exceptions are coming up which faults the line for further communication with the service</p> <p><strong>The request to create a reliable session has been refused by the RM Destination. Server 'net.tcp://localhost:2001/Sub' is too busy to process this request. Try again later. The channel could not be opened</strong>.</p> <p>During this time the the clients already subscribed are responding successfully to the pub sub requests </p> <p>No new Channels are subscribing to the service</p> <p>I am using net Tcp binding in the Service </p> <p>client code </p> <pre><code> public class Subscriber : IPublishing { static int Counter = 0; ISubscription _proxy; string _endpoint = string.Empty; public Subscriber() { _endpoint = "net.tcp://localhost:2001/sub"; MakeProxy(_endpoint, this); } void MakeProxy(string EndpoindAddress, object callbackinstance) { try { NetTcpBinding netTcpbinding = new NetTcpBinding(SecurityMode.None); EndpointAddress endpointAddress = new EndpointAddress(EndpoindAddress); InstanceContext context = new InstanceContext(callbackinstance); // Added for Reliable communication netTcpbinding.ReliableSession.Enabled = true; netTcpbinding.ReliableSession.Ordered = true; netTcpbinding.MaxBufferSize = 2147483647; netTcpbinding.MaxBufferPoolSize = 2147483647; netTcpbinding.MaxReceivedMessageSize = 2147483647; netTcpbinding.ReliableSession.InactivityTimeout = TimeSpan.MaxValue; netTcpbinding.ReceiveTimeout = TimeSpan.MaxValue; DuplexChannelFactory&lt;ISubscription&gt; channelFactory = new DuplexChannelFactory&lt;ISubscription&gt;(new InstanceContext(this), netTcpbinding, endpointAddress); _proxy = channelFactory.CreateChannel(); Counter++; } catch (Exception ex) { // } } public void Subscribe() { try { _proxy.Subscribe("500"); Counter = 0; } catch (Exception ex) { ((IContextChannel)_proxy).Abort(); } } public void Publish(Message e, String ID) { } public void _Subscribe() { try { //OnUnSubscribe(); Subscribe(); } catch (Exception ex) { } } } </code></pre> <p>Server Code </p> <pre><code>[ServiceBehavior(InstanceContextMode = InstanceContextMode.Single)] class Subscription : ISubscription { #region ISubscription Members public void Subscribe(string ID) { String s = DateTime.Now.ToString( IPublishing subscriber = OperationContext.Current.GetCallbackChannel&lt;IPublishing&gt;(); Filter.AddSubscriber(KioskID, subscriber); } public void UnSubscribe(string ID) { IPublishing subscriber = OperationContext.Current.GetCallbackChannel&lt;IPublishing&gt;(); Filter.RemoveSubscriber(KioskID, subscriber); } #endregion } class Filter { static Dictionary&lt;string, List&lt;IPublishing&gt;&gt; _subscribersList = new Dictionary&lt;string, List&lt;IPublishing&gt;&gt;(); static public Dictionary&lt;string, List&lt;IPublishing&gt;&gt; SubscribersList { get { lock (typeof(Filter)) { return _subscribersList; } } } static public List&lt;IPublishing&gt; GetSubscribers(String topicName) { lock (typeof(Filter)) { if (SubscribersList.ContainsKey(topicName)) { return SubscribersList[topicName]; } else return null; } } static public void AddSubscriber(String topicName, IPublishing subscriberCallbackReference) { DebugLog.WriteLog("C:\\DevPubSubServiceLogs", topicName + "came for Sub"); lock (typeof(Filter)) { DebugLog.WriteLog("C:\\DevPubSubServiceLogs",topicName + "inside lock"); if (SubscribersList.ContainsKey(topicName)) { // Removing any stray subscribers for same topic name // because only 1 subscriber for 1 topic name should exist SubscribersList.Remove(topicName); } List&lt;IPublishing&gt; newSubscribersList = new List&lt;IPublishing&gt;(); newSubscribersList.Add(subscriberCallbackReference); SubscribersList.Add(topicName, newSubscribersList); } DebugLog.WriteLog("C:\\DevPubSubServiceLogs", topicName + "subscribed"); } static public void RemoveSubscriber(String topicName, IPublishing subscriberCallbackReference) { lock (typeof(Filter)) { if (SubscribersList.ContainsKey(topicName)) { //if (SubscribersList[topicName].Contains(subscriberCallbackReference)) //{ // SubscribersList[topicName].Remove(subscriberCallbackReference); //} SubscribersList.Remove(topicName); } } } } </code></pre> <p>Contracts </p> <pre><code>[ServiceContract] public interface IPublishing { [OperationContract(IsOneWay = true)] void Publish(Message e, string ID); } [ServiceContract(CallbackContract = typeof(IPublishing))] public interface ISubscription { [OperationContract] void Subscribe(string topicName); [OperationContract] void UnSubscribe(string topicName); } </code></pre> <p>Please assist..</p>
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