/**
* Copyright (c) 2012, University of Konstanz, Distributed Systems Group
* 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.
* * Neither the name of the University of Konstanz nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* 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 <COPYRIGHT HOLDER> 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.
*/
//Cleversafe open-source code header - Version 1.1 - December 1, 2006
//
//Cleversafe Dispersed Storage(TM) is software for secure, private and
//reliable storage of the world's data using information dispersal.
//
//Copyright (C) 2005-2007 Cleversafe, Inc.
//
//This program is free software; you can redistribute it and/or
//modify it under the terms of the GNU General Public License
//as published by the Free Software Foundation; either version 2
//of the License, or (at your option) any later version.
//
//This program 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 for more details.
//
//You should have received a copy of the GNU General Public License
//along with this program; if not, write to the Free Software
//Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
//USA.
//
//Contact Information:
// Cleversafe, 10 W. 35th Street, 16th Floor #84,
// Chicago IL 60616
// email: licensing@cleversafe.org
//
//END-OF-HEADER
//-----------------------
//@author: John Quigley <jquigley@cleversafe.com>
//@date: January 1, 2008
//---------------------
package org.jscsi.scsi.tasks.management;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.atomic.AtomicBoolean;
import org.apache.log4j.Logger;
import org.jscsi.core.utils.NamedThreadFactory;
import org.jscsi.scsi.tasks.Task;
public class DefaultTaskManager implements TaskManager
{
private static Logger _logger = Logger.getLogger(DefaultTaskManager.class);
private ExecutorService executor;
private final AtomicBoolean running = new AtomicBoolean(false);
private TaskSet taskSet;
private Thread currentThread;
/////////////////////////////////////////////////////////////////////////////
// constructor(s)
public DefaultTaskManager(int numThreads, TaskSet taskSet)
{
executor = Executors.newFixedThreadPool(numThreads, new NamedThreadFactory("TaskExecutor"));
this.taskSet = taskSet;
}
/////////////////////////////////////////////////////////////////////////////
// TaskManager implementation
public void run()
{
this.currentThread = Thread.currentThread();
this.running.set(true);
while (this.running.get())
{
Task nextTask = null;
try
{
if (_logger.isDebugEnabled())
_logger.debug("Waiting for next task...");
nextTask = this.taskSet.take();
if (_logger.isDebugEnabled())
_logger.debug("next from taskset is task: " + nextTask.getCommand());
this.executor.submit(nextTask);
if (_logger.isDebugEnabled())
_logger.debug("submitted for execution command: " + nextTask.getCommand());
}
catch (InterruptedException e)
{
_logger.debug("Task manager thread interrupted.");
this.running.set(false);
}
catch (Exception e)
{
_logger.debug("Task manager experienced an unhandled exception, shutting down");
this.running.set(false);
}
}
_logger.info("Shutting down task manager.");
this.taskSet.clear();
executor.shutdown();
}
public void shutdown() throws InterruptedException
{
this.running.set(false);
if (this.currentThread != null)
{
this.currentThread.interrupt();
this.currentThread.join();
}
}
}