| /* |
| * 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 System; |
| using System.Threading; |
| |
| namespace Apache.NMS.ActiveMQ.Threads |
| { |
| /// <summary> |
| /// A TaskRunner that dedicates a single thread to running a single Task. |
| /// </summary> |
| public class DedicatedTaskRunner : TaskRunner |
| { |
| private readonly Mutex mutex = new Mutex(); |
| private readonly Thread theThread = null; |
| private AsyncLocal<bool> workExecutionContextCurrentlyProcessing = new AsyncLocal<bool>(); |
| private readonly Task task = null; |
| |
| private bool terminated = false; |
| private bool pending = false; |
| private bool shutdown = false; |
| |
| public DedicatedTaskRunner(Task task) |
| : this(task, "ActiveMQ Task", ThreadPriority.Normal) |
| { |
| } |
| |
| public DedicatedTaskRunner(Task task, string taskName, ThreadPriority taskPriority) |
| { |
| if(task == null) |
| { |
| throw new NullReferenceException("Task was null"); |
| } |
| |
| this.task = task; |
| |
| this.theThread = new Thread(Run); |
| this.theThread.IsBackground = true; |
| this.theThread.Priority = taskPriority; |
| this.theThread.Name = taskName; |
| this.theThread.Start(); |
| } |
| |
| public void Shutdown(TimeSpan timeout) |
| { |
| lock(mutex) |
| { |
| this.shutdown = true; |
| this.pending = true; |
| |
| Monitor.PulseAll(this.mutex); |
| |
| // Wait till the thread stops ( no need to wait if shutdown |
| // is called from thread that is shutting down) |
| if (!workExecutionContextCurrentlyProcessing.Value && !this.terminated) |
| { |
| Monitor.Wait(this.mutex, timeout); |
| } |
| } |
| } |
| |
| public void Shutdown() |
| { |
| this.Shutdown(TimeSpan.FromMilliseconds(-1)); |
| } |
| |
| public void ShutdownWithAbort(TimeSpan timeout) |
| { |
| lock(mutex) |
| { |
| this.shutdown = true; |
| this.pending = true; |
| |
| Monitor.PulseAll(this.mutex); |
| |
| // Wait till the thread stops ( no need to wait if shutdown |
| // is called from thread that is shutting down) |
| if (!workExecutionContextCurrentlyProcessing.Value && !this.terminated) |
| { |
| Monitor.Wait(this.mutex, timeout); |
| |
| if(!this.terminated) |
| { |
| theThread.Abort(); |
| } |
| } |
| } |
| } |
| |
| public void Wakeup() |
| { |
| lock(mutex) |
| { |
| if(this.shutdown) |
| { |
| return; |
| } |
| |
| this.pending = true; |
| |
| Monitor.PulseAll(this.mutex); |
| } |
| } |
| |
| internal void Run() |
| { |
| try |
| { |
| workExecutionContextCurrentlyProcessing.Value = true; |
| while(true) |
| { |
| lock(this.mutex) |
| { |
| pending = false; |
| if(this.shutdown) |
| { |
| return; |
| } |
| } |
| |
| if(!this.task.Iterate()) |
| { |
| // wait to be notified. |
| lock(this.mutex) |
| { |
| if(this.shutdown) |
| { |
| return; |
| } |
| |
| while(!this.pending) |
| { |
| Monitor.Wait(this.mutex); |
| } |
| } |
| } |
| } |
| } |
| catch(ThreadAbortException) |
| { |
| // Prevent the ThreadAbortedException for propogating. |
| Thread.ResetAbort(); |
| } |
| catch |
| { |
| } |
| finally |
| { |
| workExecutionContextCurrentlyProcessing.Value = false; |
| // Make sure we notify any waiting threads that thread |
| // has terminated. |
| lock(this.mutex) |
| { |
| this.terminated = true; |
| Monitor.PulseAll(this.mutex); |
| } |
| } |
| } |
| } |
| } |