[6983] | 1 | #region License Information
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| 2 | /* HeuristicLab
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[16453] | 3 | * Copyright (C) 2002-2019 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
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[6983] | 4 | *
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| 5 | * This file is part of HeuristicLab.
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| 6 | *
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| 7 | * HeuristicLab is free software: you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation, either version 3 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * HeuristicLab is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 15 | * GNU General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
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| 19 | */
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| 20 | #endregion
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| 21 |
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| 22 | using System;
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| 23 | using System.Collections.Generic;
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| 24 | using System.Threading;
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| 25 | using HeuristicLab.Clients.Hive.SlaveCore.Properties;
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| 26 |
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| 27 | namespace HeuristicLab.Clients.Hive.SlaveCore {
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| 28 |
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| 29 | /// <summary>
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| 30 | /// Queue for the communication between threads and AppDomains. The Queue is threadsafe and uses a semaphore
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| 31 | /// </summary>
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| 32 | public class MessageQueue : MarshalByRefObject {
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| 33 |
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| 34 | private static MessageQueue instance = null;
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| 35 |
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| 36 | private Queue<MessageContainer> queue = null;
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| 37 | private Semaphore semaphore = null;
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| 38 |
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| 39 | /// <summary>
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| 40 | /// Returns the Instance of the MessageQueue. If the instance is null, it will be created.
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| 41 | /// This is a Implementation of the Singleton pattern
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| 42 | /// </summary>
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| 43 | /// <returns>the MessageQueue Instance</returns>
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| 44 | public static MessageQueue GetInstance() {
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| 45 | if (instance == null) {
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| 46 | instance = new MessageQueue();
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| 47 | }
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| 48 | return instance;
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| 49 | }
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| 50 |
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| 51 |
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| 52 | /// <summary>
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| 53 | /// Creates a new MessageQueue Object.
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| 54 | /// A new Queue and a Semaphore is created. The Semaphore is set to a max size of 5000.
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| 55 | /// </summary>
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| 56 | private MessageQueue() {
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| 57 | queue = new Queue<MessageContainer>();
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| 58 | semaphore = new Semaphore(0, Settings.Default.QueuesMaxThreads);
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| 59 | }
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| 60 |
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| 61 | /// <summary>
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| 62 | /// Returns the oldest MessageContainer Object from the Queue.
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| 63 | /// </summary>
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| 64 | /// <returns>the oldest MessageContainer Object</returns>
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| 65 | public MessageContainer GetMessage() {
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| 66 | semaphore.WaitOne();
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| 67 | lock (this) {
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| 68 | if (queue.Count > 0) {
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| 69 | return queue.Dequeue();
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| 70 | }
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| 71 | }
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| 72 | return null;
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| 73 | }
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| 74 |
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| 75 | /// <summary>
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| 76 | /// Adds a MessageContainer Object to the Queue
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| 77 | /// </summary>
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| 78 | /// <param name="messageContainer">the MessageContainer</param>
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| 79 | public void AddMessage(MessageContainer messageContainer) {
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| 80 | lock (this) {
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| 81 | queue.Enqueue(messageContainer);
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| 82 | semaphore.Release();
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| 83 | }
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| 84 | }
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| 85 |
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| 86 | /// <summary>
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| 87 | /// Adds a message to the Queue. The MessageContainer Object is built in the Method
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| 88 | /// </summary>
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| 89 | /// <param name="message">the Message</param>
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| 90 | public void AddMessage(MessageContainer.MessageType message) {
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| 91 | lock (this) {
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| 92 | queue.Enqueue(new MessageContainer(message));
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| 93 | semaphore.Release();
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| 94 | }
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| 95 | }
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| 96 | }
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| 97 | }
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