| /* |
| * 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.Collections.Generic; |
| using System.Threading; |
| |
| namespace Apache.NMS.ActiveMQ.Threads |
| { |
| /// <summary> |
| /// A TaskRunner that dedicates a single thread to running a single Task. |
| /// </summary> |
| public class CompositeTaskRunner : TaskRunner |
| { |
| private readonly Mutex mutex = new Mutex(); |
| private readonly Thread theThread = null; |
| private readonly LinkedList<CompositeTask> tasks = new LinkedList<CompositeTask>(); |
| |
| private bool terminated = false; |
| private bool pending = false; |
| private bool shutdown = false; |
| |
| private string name = "CompositeTaskRunner"; |
| |
| public CompositeTaskRunner() |
| { |
| this.theThread = new Thread(Run) {IsBackground = true}; |
| this.theThread.Start(); |
| } |
| |
| public CompositeTaskRunner(string name) |
| { |
| this.name = name; |
| this.theThread = new Thread(Run) {IsBackground = true}; |
| this.theThread.Start(); |
| } |
| |
| public void AddTask(CompositeTask task) |
| { |
| lock(mutex) |
| { |
| this.tasks.AddLast(task); |
| this.Wakeup(); |
| } |
| } |
| |
| public void RemoveTask(CompositeTask task) |
| { |
| lock(mutex) |
| { |
| this.tasks.Remove(task); |
| this.Wakeup(); |
| } |
| } |
| |
| 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(Thread.CurrentThread != this.theThread && !this.terminated) |
| { |
| Monitor.Wait(this.mutex, timeout); |
| } |
| } |
| |
| Tracer.Debug(name + ": Task Runner Shut Down"); |
| } |
| |
| 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(Thread.CurrentThread != this.theThread && !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 |
| { |
| while(true) |
| { |
| lock(this.mutex) |
| { |
| pending = false; |
| |
| if(this.shutdown) |
| { |
| return; |
| } |
| } |
| |
| if(!this.Iterate()) |
| { |
| // wait to be notified. |
| lock(this.mutex) |
| { |
| if(this.shutdown) |
| { |
| return; |
| } |
| |
| while(!this.pending) |
| { |
| Monitor.Wait(this.mutex); |
| } |
| } |
| } |
| } |
| } |
| catch(ThreadAbortException) |
| { |
| Thread.ResetAbort(); |
| } |
| catch |
| { |
| } |
| finally |
| { |
| // Make sure we notify any waiting threads that thread |
| // has terminated. |
| lock(this.mutex) |
| { |
| this.terminated = true; |
| Monitor.PulseAll(this.mutex); |
| } |
| } |
| } |
| |
| private bool Iterate() |
| { |
| Task pendingTask = null; |
| |
| lock (mutex) |
| { |
| foreach (CompositeTask task in this.tasks) |
| { |
| if (task.IsPending) |
| { |
| pendingTask = task; |
| break; |
| } |
| } |
| } |
| |
| if (pendingTask != null) |
| { |
| pendingTask.Iterate(); |
| // Always return true here so that we can check the next |
| // task in the list to see if its done. |
| return true; |
| } |
| |
| return false; |
| } |
| } |
| } |