| /* |
| * 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; |
| using System.Collections.Generic; |
| using Apache.NMS.Stomp.Commands; |
| |
| namespace Apache.NMS.Stomp.Util |
| { |
| public class MessageDispatchChannel |
| { |
| private readonly Mutex mutex = new Mutex(); |
| private readonly ManualResetEvent waiter = new ManualResetEvent(false); |
| private bool closed; |
| private bool running; |
| private readonly LinkedList<MessageDispatch> channel = new LinkedList<MessageDispatch>(); |
| |
| #region Properties |
| |
| public object SyncRoot |
| { |
| get{ return this.mutex; } |
| } |
| |
| public bool Closed |
| { |
| get |
| { |
| lock(this.mutex) |
| { |
| return this.closed; |
| } |
| } |
| |
| set |
| { |
| lock(this.mutex) |
| { |
| this.closed = value; |
| } |
| } |
| } |
| |
| public bool Running |
| { |
| get |
| { |
| lock(this.mutex) |
| { |
| return this.running; |
| } |
| } |
| |
| set |
| { |
| lock(this.mutex) |
| { |
| this.running = value; |
| } |
| } |
| } |
| |
| public bool Empty |
| { |
| get |
| { |
| lock(mutex) |
| { |
| return channel.Count == 0; |
| } |
| } |
| } |
| |
| public long Count |
| { |
| get |
| { |
| lock(mutex) |
| { |
| return channel.Count; |
| } |
| } |
| } |
| |
| #endregion |
| |
| public void Start() |
| { |
| lock(this.mutex) |
| { |
| if(!Closed) |
| { |
| this.running = true; |
| this.waiter.Set(); |
| this.waiter.Reset(); |
| } |
| } |
| } |
| |
| public void Stop() |
| { |
| lock(mutex) |
| { |
| this.running = false; |
| this.waiter.Set(); |
| this.waiter.Reset(); |
| } |
| } |
| |
| public void Close() |
| { |
| lock(mutex) |
| { |
| if(!Closed) |
| { |
| this.running = false; |
| this.closed = true; |
| } |
| |
| this.waiter.Set(); |
| } |
| } |
| |
| public void Enqueue(MessageDispatch dispatch) |
| { |
| lock(this.mutex) |
| { |
| this.channel.AddLast(dispatch); |
| this.waiter.Set(); |
| this.waiter.Reset(); |
| } |
| } |
| |
| public void EnqueueFirst(MessageDispatch dispatch) |
| { |
| lock(this.mutex) |
| { |
| this.channel.AddFirst(dispatch); |
| this.waiter.Set(); |
| this.waiter.Reset(); |
| } |
| } |
| |
| public MessageDispatch Dequeue(TimeSpan timeout) |
| { |
| MessageDispatch result = null; |
| |
| this.mutex.WaitOne(); |
| |
| // Wait until the channel is ready to deliver messages. |
| if( timeout != TimeSpan.Zero && !Closed && ( Empty || !Running ) ) |
| { |
| this.mutex.ReleaseMutex(); |
| this.waiter.WaitOne((int)timeout.TotalMilliseconds, false); |
| this.mutex.WaitOne(); |
| } |
| |
| if( !Closed && Running && !Empty ) |
| { |
| result = DequeueNoWait(); |
| } |
| |
| this.mutex.ReleaseMutex(); |
| |
| return result; |
| } |
| |
| public MessageDispatch DequeueNoWait() |
| { |
| MessageDispatch result = null; |
| |
| lock(this.mutex) |
| { |
| if( Closed || !Running || Empty ) |
| { |
| return null; |
| } |
| |
| result = channel.First.Value; |
| this.channel.RemoveFirst(); |
| } |
| |
| return result; |
| } |
| |
| public MessageDispatch Peek() |
| { |
| lock(this.mutex) |
| { |
| if( Closed || !Running || Empty ) |
| { |
| return null; |
| } |
| |
| return channel.First.Value; |
| } |
| } |
| |
| public void Clear() |
| { |
| lock(mutex) |
| { |
| this.channel.Clear(); |
| } |
| } |
| |
| public MessageDispatch[] RemoveAll() |
| { |
| MessageDispatch[] result; |
| |
| lock(mutex) |
| { |
| result = new MessageDispatch[this.Count]; |
| channel.CopyTo(result, 0); |
| channel.Clear(); |
| } |
| |
| return result; |
| } |
| } |
| } |