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Clustering and Coordination Frameworks
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/*
 * Copyright (c) 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016 David Berkman
 * 
 * This file is part of the SmallMind Code Project.
 * 
 * The SmallMind Code Project is free software, you can redistribute
 * it and/or modify it under either, at your discretion...
 * 
 * 1) The terms of GNU Affero General Public License as published by the
 * Free Software Foundation, either version 3 of the License, or (at
 * your option) any later version.
 * 
 * ...or...
 * 
 * 2) The terms of the Apache License, Version 2.0.
 * 
 * The SmallMind Code Project is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty
 * of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License or Apache License for more details.
 * 
 * You should have received a copy of the GNU Affero General Public License
 * and the Apache License along with the SmallMind Code Project. If not, see
 *  or .
 * 
 * Additional permission under the GNU Affero GPL version 3 section 7
 * ------------------------------------------------------------------
 * If you modify this Program, or any covered work, by linking or
 * combining it with other code, such other code is not for that reason
 * alone subject to any of the requirements of the GNU Affero GPL
 * version 3.
 */
package org.smallmind.phalanx.wire.mock;

import java.util.ArrayList;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicBoolean;
import org.smallmind.scribe.pen.LoggerManager;

public class MockQueue {

  private final AtomicBoolean closed = new AtomicBoolean(false);
  private final QueueWorker worker;
  private final ConcurrentLinkedQueue messageQueue = new ConcurrentLinkedQueue<>();
  private final ArrayList listenerList = new ArrayList<>();
  private int listenerIndex = 0;

  public MockQueue () {

    Thread thread = new Thread(worker = new QueueWorker());

    thread.setDaemon(true);
    thread.start();
  }

  public void addListener (MockMessageListener listener) {

    synchronized (listenerList) {
      listenerList.add(listener);
    }
  }

  public void removeListener (MockMessageListener listener) {

    synchronized (listenerList) {
      listenerList.remove(listener);
    }
  }

  public void send (MockMessage message) {

    messageQueue.add(message);
  }

  @Override
  protected void finalize () {

    worker.close();
  }

  private class QueueWorker implements Runnable {

    public void close () {

      closed.set(true);
    }

    @Override
    public void run () {

      while (!closed.get()) {

        MockMessage message;

        if ((message = messageQueue.poll()) != null) {
          synchronized (listenerList) {
            if (listenerIndex >= listenerList.size()) {
              listenerIndex = 0;
            }

            listenerList.get(listenerIndex++).handle(message);
          }
        } else {
          try {
            Thread.sleep(500);
          } catch (InterruptedException interruptedException) {
            LoggerManager.getLogger(MockQueue.class).error(interruptedException);
          }
        }
      }
    }
  }
}