| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You under the Apache License, Version 2.0 |
| * (the "License"); you may not use this file except in compliance with |
| * the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| using ActiveMQ.Commands; |
| using ActiveMQ.Util; |
| using NMS; |
| using System; |
| using System.Collections; |
| using System.Threading; |
| |
| namespace ActiveMQ |
| { |
| |
| /// <summary> |
| /// Handles the multi-threaded dispatching between the transport and the consumers |
| /// </summary> |
| public class Dispatcher |
| { |
| Queue queue = new Queue(); |
| ArrayList messagesToRedeliver = new ArrayList(); |
| |
| // TODO can't use EventWaitHandle on MONO 1.0 |
| //AutoResetEvent messageReceivedEventHandle = new AutoResetEvent(false); |
| //Object semaphore = new Object(); |
| AutoResetEvent messageReceivedEventHandle; |
| readonly EventSemaphore semaphore = new EventSemaphore(); |
| |
| bool m_bAsyncDelivery = false; |
| bool m_bClosed = false; |
| |
| public void SetAsyncDelivery(AutoResetEvent eventHandle) |
| { |
| lock (semaphore) |
| { |
| messageReceivedEventHandle = eventHandle; |
| m_bAsyncDelivery = true; |
| if (queue.Count > 0) |
| { |
| PulseSemaphore(); |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Whem we start a transaction we must redeliver any rolled back messages |
| /// </summary> |
| public void RedeliverRolledBackMessages() |
| { |
| lock (semaphore) |
| { |
| Queue replacement = new Queue(queue.Count + messagesToRedeliver.Count); |
| foreach (ActiveMQMessage element in messagesToRedeliver) |
| { |
| replacement.Enqueue(element); |
| } |
| messagesToRedeliver.Clear(); |
| |
| while (queue.Count > 0) |
| { |
| ActiveMQMessage element = (ActiveMQMessage) queue.Dequeue(); |
| replacement.Enqueue(element); |
| } |
| queue = replacement; |
| if (queue.Count > 0) |
| { |
| PulseSemaphore(); |
| } |
| } |
| } |
| |
| /// <summary> |
| /// Redeliver the given message, putting it at the head of the queue |
| /// </summary> |
| public void Redeliver(ActiveMQMessage message) |
| { |
| lock (semaphore) |
| { |
| messagesToRedeliver.Add(message); |
| } |
| } |
| |
| /// <summary> |
| /// Method Enqueue |
| /// </summary> |
| public void Enqueue(ActiveMQMessage message) |
| { |
| lock (semaphore) |
| { |
| queue.Enqueue(message); |
| PulseSemaphore(); |
| } |
| } |
| |
| /// <summary> |
| /// Method DequeueNoWait |
| /// </summary> |
| public IMessage DequeueNoWait() |
| { |
| IMessage rc = null; |
| lock (semaphore) |
| { |
| if (!m_bClosed && queue.Count > 0) |
| { |
| rc = (IMessage) queue.Dequeue(); |
| } |
| } |
| return rc; |
| } |
| |
| /// <summary> |
| /// Method Dequeue |
| /// </summary> |
| public IMessage Dequeue(TimeSpan timeout) |
| { |
| IMessage rc; |
| bool bClosed = false; |
| lock (semaphore) |
| { |
| bClosed = m_bClosed; |
| rc = DequeueNoWait(); |
| } |
| |
| while (!bClosed && rc == null) |
| { |
| /* |
| if( !messageReceivedEventHandle.WaitOne((int)timeout.TotalMilliseconds, false) ) |
| { |
| break; |
| } |
| */ |
| if (messageReceivedEventHandle != null) |
| { |
| if( !messageReceivedEventHandle.WaitOne(timeout, false) ) |
| { |
| break; |
| } |
| } |
| else |
| { |
| semaphore.Wait(timeout); |
| } |
| lock (semaphore) |
| { |
| rc = DequeueNoWait(); |
| bClosed = m_bClosed; |
| } |
| } |
| return rc; |
| } |
| |
| /// <summary> |
| /// Method Dequeue |
| /// </summary> |
| public IMessage Dequeue() |
| { |
| return Dequeue(TimeSpan.MaxValue); |
| } |
| |
| internal void Close() |
| { |
| lock (semaphore) |
| { |
| m_bClosed = true; |
| if(m_bAsyncDelivery) |
| { |
| PulseSemaphore(); |
| } |
| } |
| } |
| |
| protected void PulseSemaphore() |
| { |
| if (messageReceivedEventHandle != null) |
| { |
| messageReceivedEventHandle.Set(); |
| } |
| semaphore.PulseAll(); |
| } |
| } |
| } |