/*
* Copyright (C) 2008-2015 by Holger Arndt
*
* This file is part of the Universal Java Matrix Package (UJMP).
* See the NOTICE file distributed with this work for additional
* information regarding copyright ownership and licensing.
*
* UJMP is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* UJMP 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with UJMP; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301 USA
*/
package org.ujmp.core.util.concurrent;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
public abstract class BackgroundTask {
private final Object[] objects;
private final Future<?> future;
private final ExecutorService es = Executors.newSingleThreadExecutor();
public BackgroundTask(final Object... objects) {
this.objects = objects;
future = es.submit(new BackgroundTaskCallable());
}
public abstract Object run();
public Object getResult() throws InterruptedException, ExecutionException {
Object result = future.get();
es.shutdown();
return result;
}
public final Object getObject(final int i) {
return objects[i];
}
class BackgroundTaskCallable implements Callable<Object> {
public BackgroundTaskCallable() {
}
public final Void call() throws Exception {
try {
run();
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
}
}