/**
This file is part of JkernelMachines.
JkernelMachines 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 3 of the License, or
(at your option) any later version.
JkernelMachines 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 JkernelMachines. If not, see <http://www.gnu.org/licenses/>.
Copyright David Picard - 2010
*/
package fr.lip6.jkernelmachines.threading;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import fr.lip6.jkernelmachines.util.DebugPrinter;
/**
* Threading utility used by various algorithm for obtaining a pool of threads.
*
* @author picard
*
*/
public class ThreadPoolServer {
// private static ThreadPoolExecutor executor;
private static DebugPrinter debug = new DebugPrinter();
/**
* Tells the system wide ThreadPoolServer (Singleton pattern)
*
* @return system wide instance of this class.
*/
public static ThreadPoolExecutor getThreadPoolExecutor() {
ThreadPoolExecutor executor;
int nbcpu = Runtime.getRuntime().availableProcessors();
executor = new ThreadPoolExecutor(nbcpu, 2 * nbcpu, 1,
TimeUnit.SECONDS, new LinkedBlockingQueue<Runnable>());
executor.prestartAllCoreThreads();
executor.allowCoreThreadTimeOut(true);
return executor;
}
/**
* Stops the server.
*/
public static void shutdownNow(ThreadPoolExecutor executor) {
if (executor != null) {
executor.shutdown();
try {
while (!executor.isShutdown()) {
executor.awaitTermination(100, TimeUnit.MILLISECONDS);
}
} catch (InterruptedException e) {
debug.println(1, "Failed to awxait termination");
e.printStackTrace();
}
}
executor = null;
}
}