/**
Copyright (C) SYSTAP, LLC DBA Blazegraph 2006-2016. All rights reserved.
Contact:
SYSTAP, LLC DBA Blazegraph
2501 Calvert ST NW #106
Washington, DC 20008
licenses@blazegraph.com
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; version 2 of the License.
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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.bigdata.rdf.graph.impl;
import java.util.concurrent.Executors;
import java.util.concurrent.ThreadFactory;
/**
* A thread factory that configures the thread as a daemon thread.
*
* @author <a href="mailto:thompsonbry@users.sourceforge.net">Bryan Thompson</a>
* @version $Id: DaemonThreadFactory.java 5824 2011-12-29 20:52:02Z thompsonbry $
*/
/*
* Note: This is a clone of the same-named class in the bigdata module. The
* clone exists to have it under the Apache 2 license requiring the creation of
* a bigdata-commons module.
*/
class DaemonThreadFactory implements ThreadFactory {
final private ThreadFactory delegate;
final private String basename; // MAY be null.
private int counter = 0; // used iff basename was given.
private static ThreadFactory _default = new DaemonThreadFactory();
/**
* Returns an instance based on {@link Executors#defaultThreadFactory()}
* that configures the thread for daemon mode.
*/
final public static ThreadFactory defaultThreadFactory() {
return _default;
}
/**
* Uses {@link Executors#defaultThreadFactory()} as the delegate.
*/
public DaemonThreadFactory() {
this( Executors.defaultThreadFactory(), null/*basename*/ );
}
public DaemonThreadFactory(String basename) {
this(Executors.defaultThreadFactory(), basename);
}
/**
* Uses the specified delegate {@link ThreadFactory}.
*
* @param delegate
* The delegate thread factory that is responsible for creating
* the threads.
* @param basename
* Optional prefix that will be used to assign names to the
* generated threads.
*/
public DaemonThreadFactory(final ThreadFactory delegate,
final String basename) {
if (delegate == null)
throw new IllegalArgumentException();
this.delegate = delegate;
this.basename = basename;
}
public Thread newThread(final Runnable r) {
final Thread t = delegate.newThread( r );
if (basename != null) {
counter++;
t.setName(basename + counter);
}
t.setDaemon(true);
// System.err.println("new thread: "+t.getName()+", id="+t.getId());
return t;
}
}