Mercurial > hg > release > thermostat-1.0
view common/core/src/main/java/com/redhat/thermostat/common/ThreadPoolTimerFactory.java @ 1412:a0592d702416
Update copyright year in release branch.
reviewed-by: neugens
review-thread: http://icedtea.classpath.org/pipermail/thermostat/2014-June/009965.html
PR1821
author | Jon VanAlten <jon.vanalten@redhat.com> |
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date | Tue, 03 Jun 2014 11:55:56 -0600 |
parents | ea2a5aedd25a |
children |
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/* * Copyright 2012-2014 Red Hat, Inc. * * This file is part of Thermostat. * * Thermostat 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, or (at your * option) any later version. * * Thermostat 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 Thermostat; see the file COPYING. If not see * <http://www.gnu.org/licenses/>. * * Linking this code with other modules is making a combined work * based on this code. Thus, the terms and conditions of the GNU * General Public License cover the whole combination. * * As a special exception, the copyright holders of this code give * you permission to link this code with independent modules to * produce an executable, regardless of the license terms of these * independent modules, and to copy and distribute the resulting * executable under terms of your choice, provided that you also * meet, for each linked independent module, the terms and conditions * of the license of that module. An independent module is a module * which is not derived from or based on this code. If you modify * this code, you may extend this exception to your version of the * library, but you are not obligated to do so. If you do not wish * to do so, delete this exception statement from your version. */ package com.redhat.thermostat.common; import java.util.concurrent.Executors; import java.util.concurrent.ScheduledExecutorService; import java.util.concurrent.ScheduledFuture; import java.util.concurrent.ThreadFactory; import java.util.concurrent.TimeUnit; public class ThreadPoolTimerFactory implements TimerFactory { public ThreadPoolTimerFactory(int poolSize) { this(poolSize, Thread.currentThread().getThreadGroup()); } ThreadPoolTimerFactory(int poolSize, final ThreadGroup group) { timerThreadPool = Executors.newScheduledThreadPool(poolSize, new ThreadFactory() { @Override public Thread newThread(Runnable r) { return new Thread(group, r); } }); } private class ThreadPoolTimer implements Timer { private Runnable action; private long delay; private long period; private TimeUnit timeUnit = TimeUnit.MILLISECONDS; private SchedulingType schedulingType = SchedulingType.ONCE; private ScheduledFuture<?> timerTask; @Override public void start() { if (action != null) { startScheduling(); } } private void startScheduling() { switch (schedulingType) { case FIXED_RATE: timerTask = timerThreadPool.scheduleAtFixedRate(action, delay, period, timeUnit); break; case FIXED_DELAY: timerTask = timerThreadPool.scheduleWithFixedDelay(action, delay, period, timeUnit); break; case ONCE: default: timerTask = timerThreadPool.schedule(action, delay, timeUnit); } } @Override public void stop() { if (timerTask != null) { timerTask.cancel(false); } } @Override public void setAction(Runnable action) { this.action = new ExceptionPrintingRunnable(action); } @Override public void setInitialDelay(long delay) { this.delay = delay; } @Override public void setDelay(long period) { this.period = period; } @Override public void setSchedulingType(SchedulingType schedulingType) { if (schedulingType == null) { throw new NullPointerException(); } this.schedulingType = schedulingType; } @Override public void setTimeUnit(TimeUnit timeUnit) { this.timeUnit = timeUnit; } } /** * A decorator for another Runnable object that ensures all exceptions are * printed. Needed because scheduled executors remain silent on failures. */ private static class ExceptionPrintingRunnable implements Runnable { private final Runnable original; public ExceptionPrintingRunnable(Runnable original) { this.original = original; } @Override public void run() { try { original.run(); } catch (Exception e) { e.printStackTrace(); throw e; } } } private ScheduledExecutorService timerThreadPool; @Override public Timer createTimer() { return new ThreadPoolTimer(); } @Override public void shutdown() { timerThreadPool.shutdown(); } }