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source: branches/gteufl/HeuristicLab.Clients.Hive.Slave/3.3/ExecutorQueue.cs @ 12969

Last change on this file since 12969 was 12969, checked in by gkronber, 9 years ago

#2478 merged all changes from trunk to branch before trunk-reintegration

File size: 2.6 KB
Line 
1#region License Information
2/* HeuristicLab
3 * Copyright (C) 2002-2015 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
4 *
5 * This file is part of HeuristicLab.
6 *
7 * HeuristicLab is free software: you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation, either version 3 of the License, or
10 * (at your option) any later version.
11 *
12 * HeuristicLab is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
19 */
20#endregion
21
22using System;
23using System.Collections.Generic;
24using System.Threading;
25using HeuristicLab.Clients.Hive.SlaveCore.Properties;
26
27namespace HeuristicLab.Clients.Hive.SlaveCore {
28  /// <summary>
29  /// Every Executor gets an ExecutorQueue in which it can push messages.
30  /// These messages are then read and processed from outside the appdomain.
31  /// </summary>
32  public class ExecutorQueue : MarshalByRefObject {
33    private Queue<ExecutorMessage> queue = null;
34    private Semaphore semaphore = null;
35
36    public ExecutorQueue() {
37      queue = new Queue<ExecutorMessage>();
38      semaphore = new Semaphore(0, Settings.Default.QueuesMaxThreads);
39    }
40
41    /// <summary>
42    /// Returns the oldest ExecutorMessage Object from the Queue.
43    /// </summary>
44    /// <returns>the oldest ExecutorMessage Object</returns>
45    public ExecutorMessage GetMessage() {
46      semaphore.WaitOne(Settings.Default.ExecutorQueueTimeout);
47      lock (this) {
48        if (queue.Count > 0) {
49          return queue.Dequeue();
50        }
51      }
52      return null;
53    }
54
55    /// <summary>
56    /// Adds a ExecutorMessage Object to the Queue
57    /// </summary>
58    /// <param name="message">the ExecutorMessage</param>
59    public void AddMessage(ExecutorMessage message) {
60      lock (this) {
61        queue.Enqueue(message);
62        semaphore.Release();
63      }
64    }
65
66    /// <summary>
67    /// Adds a message to the Queue. The ExecutorMessage Object is built in the Method
68    /// </summary>
69    /// <param name="message">the Message</param>
70    public void AddMessage(ExecutorMessageType message) {
71      lock (this) {
72        queue.Enqueue(new ExecutorMessage(message));
73        semaphore.Release();
74      }
75    }
76  }
77}
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