/// <summary>
/// Initializes a new instance of the ResponseCallbackItem class.
/// </summary>
/// <param name="callback">the response callback.</param>
/// <param name="filter">the filter for the responses.</param>
/// <param name="expectResponseCount">the expected responses count that should returned through this callback.</param>
/// <param name="callbackState">the callback state object.</param>
/// <param name="needRemove">a value indicating whether need remove the fetched responses.</param>
public ResponseCallbackItem(BrokerQueueCallback callback, MessageVersion messageVersion, ResponseActionFilter filter, long expectResponseCount, object callbackState)
{
if (callback == null)
{
throw new ArgumentNullException("callback");
}
this.responsesCallbackField = callback;
this.messageVersionField = messageVersion;
this.responseFilterField = filter;
this.expectedResponsesCountField = expectResponseCount;
this.callbackStateField = callbackState;
}
public void GetRequestAsync(BrokerQueueCallback requestCallback, object state)
{
ParamCheckUtility.ThrowIfNull(requestCallback, "requestCallback");
bool isCallbackHandled = false;
if (this.requestCacheQueue.Count > 0)
{
BrokerQueueItem request = null;
if (!this.requestCacheQueue.TryDequeue(out request))
{
BrokerTracing.TraceInfo("[BrokerQueueDispatcher] .GetRequestAsync: All cached requests are dispatched.");
}
if (request != null)
{
try
{
#if DEBUG
BrokerTracing.TraceVerbose("[BrokerQueueDispatcher] .GetRequestAsync: handle request callback from cache queue. request id={0}", GetMessageId(request));
#endif
this.RegisterReemit(request);
isCallbackHandled = true;
requestCallback(request, state);
}
catch (Exception e)
{
this.requestCacheQueue.Enqueue(request);
// request callback raise exception.
BrokerTracing.TraceWarning("[BrokerQueueDispatcher] .GetRequestAsync: The request callback raise exception. Exception: {0}", e);
}
}
}
if (this.requestCacheQueue.Count <= this.watermarkerForTriggerPrefetch)
{
BrokerTracing.TraceVerbose("[BrokerQueueDispatcher] .GetRequestAsync (perf): Trigger prefetch because the count of cached items is below threshold. state={0}", (int)state);
this.TriggerPrefetch();
}
if (!isCallbackHandled)
{
this.requestCallbackQueue.Enqueue(new BrokerQueueCallbackItem(requestCallback, state));
// in case the last request come in the cache queue right before the request callback enqueue.
this.HandlePendingRequestCallback();
}
}
/// <summary> /// register a response call back to get the response message. /// </summary> /// <param name="responseCallback">the response callback, the async result should be the BrokerQueueItem</param> /// <param name="messageVersion">the message version for the response message. if failed to pull the response from the storage, will use this version to create a fault message.</param> /// <param name="filter">the filter for the responses that the response callback expected.</param> /// <param name="responseCount">the responses count this registered response callback want to get.</param> /// <param name="state">the state object for the callback</param> /// <returns>a value indicating whether the response callback is registered sucessfully.</returns> public abstract bool RegisterResponsesCallback(BrokerQueueCallback responseCallback, MessageVersion messageVersion, ResponseActionFilter filter, int responseCount, object state);
/// <summary> /// Fetch the requests one by one from the storage but not remove the original message in the storage. /// if reach the end of the storage, empty exception raised.this is async call by BrokerQueueCallback. /// the async result will return the request message /// </summary> /// <param name="requestCallback">the call back to retrieve the request message</param> /// <param name="state">the async state object</param> public abstract void GetRequestAsync(BrokerQueueCallback requestCallback, object state);
public BrokerQueueCallbackReferencedThreadHelper(BrokerQueueCallback callback, ReferenceObject refObj) : base(refObj)
{
this.brokerQueueCallback = callback;
}
/// <summary>
/// Initializes a new instance of the BrokerQueueCallbackItem class.
/// </summary>
/// <param name="brokerQueueCallback">the response/request callback.</param>
/// <param name="state">the state object for the callback.</param>
public BrokerQueueCallbackItem(BrokerQueueCallback brokerQueueCallback, object state)
{
ParamCheckUtility.ThrowIfNull(brokerQueueCallback, "brokerQueueCallback");
this.brokerQueueCallbackField = brokerQueueCallback;
this.callbackStateField = state;
}
public override bool RegisterResponsesCallback(BrokerQueueCallback responseCallback, MessageVersion messageVersion, ResponseActionFilter filter, int responseCount, object state)
{
throw new NotImplementedException();
}
/// <summary>
/// Fetch the requests one by one from the storage but not remove the original message in the storage.
/// if reach the end of the storage, empty exception raised.this is async call by BrokerQueueCallback.
/// the async result will return the request message
/// </summary>
/// <param name="requestCallback">the call back to retrieve the request message</param>
/// <param name="state">the async state object</param>
public override void GetRequestAsync(BrokerQueueCallback requestCallback, object state)
{
this.callbackQueue.Enqueue(new KeyValuePair <BrokerQueueCallback, object>(requestCallback, state));
}