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/*******************************************************************************
* Copyright (c) 2010-2014, Miklos Foldenyi, Andras Szabolcs Nagy, Abel Hegedus, Akos Horvath, Zoltan Ujhelyi and Daniel Varro
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package org.eclipse.viatra.dse.multithreading;
import java.util.concurrent.RejectedExecutionException;
import java.util.concurrent.SynchronousQueue;
import java.util.concurrent.ThreadPoolExecutor;
import java.util.concurrent.TimeUnit;
import org.apache.log4j.Logger;
import org.eclipse.viatra.dse.api.DesignSpaceExplorer;
import org.eclipse.viatra.dse.base.ExplorerThread;
/**
*
* @author Andras Szabolcs Nagy
*
*/
public class DSEThreadPool extends ThreadPoolExecutor {
private static final long THREAD_KEEP_ALIVE_IN_SECONDS = 60;
public DSEThreadPool() {
// Based on the Executors.newCachedThreadPool()
super(0, getProcNumber(), THREAD_KEEP_ALIVE_IN_SECONDS, TimeUnit.SECONDS, new SynchronousQueue<Runnable>());
}
// helper for constructor
private static int getProcNumber() {
return Runtime.getRuntime().availableProcessors();
}
public boolean tryStartNewStrategy(ExplorerThread strategy) {
if (!canStartNewThread()) {
return false;
}
try {
submit(strategy);
} catch (RejectedExecutionException e) {
Logger.getLogger(DesignSpaceExplorer.class).info("Couldn't start new thread.", e);
return false;
}
return true;
}
public boolean canStartNewThread() {
return getMaximumPoolSize() > getActiveCount();
}
}
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