content: /*
   * Copyright (c) 2017, Andreas Fagschlunger. All rights reserved.
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   *   - Redistributions of source code must retain the above copyright
   *     notice, this list of conditions and the following disclaimer.
   *
   *   - Redistributions in binary form must reproduce the above copyright
   *     notice, this list of conditions and the following disclaimer in the
   *     documentation and/or other materials provided with the distribution.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
   * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
   * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
   * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package at.o2xfs.xfs.service.cmd;
  
  import java.util.List;
  import java.util.concurrent.CopyOnWriteArrayList;
  
  import at.o2xfs.log.Logger;
  import at.o2xfs.log.LoggerFactory;
  
  public abstract class AbstractAsyncCommand<E extends IAsyncCommandListener>
  		implements IAsyncCommand<E> {
  
  	private final static Logger LOG = LoggerFactory
  			.getLogger(AbstractAsyncCommand.class);
  
  	protected List<E> commandListeners = null;
  
  	public AbstractAsyncCommand() {
  		commandListeners = new CopyOnWriteArrayList<E>();
  	}
  
  	public final void execute() {
  		final Runnable runnable = new Runnable() {
  
  			@Override
  			public void run() {
  				doExecute();
  			}
  		};
  		new Thread(runnable, getClass().getSimpleName()).start();
  	}
  
  	abstract protected void doExecute();
  
  	public abstract void cancel();
  
  	protected void notifyCommandCancelled() {
  		final String method = "notifyCommandCancelled()";
  		if (LOG.isDebugEnabled()) {
  			LOG.debug(method, "");
  		}
  		for (final E listener : commandListeners) {
  			listener.commandCancelled();
  		}
  	}
  
  	protected void notifyCommandFailed(final Exception e) {
  		for (final E listener : commandListeners) {
  			listener.commandFailed(e);
  		}
  	}
  
  	protected void notifyCommandSuccessful() {
  		for (final E l : commandListeners) {
  			l.commandSuccessful();
  		}
  	}
  
  	public void addCommandListener(final E e) {
  		if (LOG.isDebugEnabled()) {
  			final String method = "addCommandListener(E)";
  			LOG.debug(method, "e=" + e);
  		}
  		commandListeners.add(e);
  	}
  
  	public void removeCommandListener(final E e) {
  		if (LOG.isDebugEnabled()) {
  			final String method = "removeCommandListener(E)";
  			LOG.debug(method, "e=" + e);
  		}
  		commandListeners.remove(e);
  	}
  }