org.rifidi.edge.ale.esper.timer.Timer.java Source code

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Here is the source code for org.rifidi.edge.ale.esper.timer.Timer.java

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/*
 * 
 * Timer.java
 *  
 * Created:     July 8th, 2009
 * Project:       Rifidi Edge Server - A middleware platform for RFID applications
 *                   http://www.rifidi.org
 *                   http://rifidi.sourceforge.net
 * Copyright:   Pramari LLC and the Rifidi Project
 * License:      The software in this package is published under the terms of the GPL License
 *                   A copy of the license is included in this distribution under RifidiEdge-License.txt 
 */
/**
 * 
 */
package org.rifidi.edge.ale.esper.timer;

import java.util.Set;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import com.espertech.esper.client.EPServiceProvider;
import com.espertech.esper.client.EventSender;

/**
 * External timer for sending out start and stop events. TODO: create a global
 * timer!
 * 
 * @author Jochen Mader - jochen@pramari.com
 * 
 */
public class Timer {
    /** Logger for this class. */
    private static final Log logger = LogFactory.getLog(Timer.class);
    private ScheduledThreadPoolExecutor executor;

    /**
     * Constructor.
     * 
     * @param startTriggers
     * @param stopTriggers
     * @param esper
     */
    public Timer(Set<Trigger> startTriggers, Set<Trigger> stopTriggers, EPServiceProvider esper) {
        logger.debug("New timer created. ");
        executor = new ScheduledThreadPoolExecutor(2);
        EventSender startSender = esper.getEPRuntime().getEventSender("StartEvent");
        EventSender stopSender = esper.getEPRuntime().getEventSender("StopEvent");
        for (Trigger trigger : startTriggers) {
            trigger.setTarget(this);
            trigger.setEventSender(startSender);
            trigger.setStart(true);
        }
        for (Trigger trigger : stopTriggers) {
            trigger.setTarget(this);
            trigger.setEventSender(stopSender);
            trigger.setStart(false);
        }
        for (Trigger trigger : startTriggers) {
            logger.debug("start trigger created: " + trigger.getPeriod() + " ms");
            executor.scheduleAtFixedRate(trigger, trigger.getDelayToNextExec(), trigger.getPeriod(),
                    TimeUnit.MILLISECONDS);
        }
        for (Trigger trigger : stopTriggers) {
            logger.debug("stop trigger created: " + trigger.getPeriod() + " ms");
            executor.scheduleAtFixedRate(trigger, trigger.getDelayToNextExec(), trigger.getPeriod(),
                    TimeUnit.MILLISECONDS);
        }
    }

    /**
     * Destroy the timer.
     */
    public void destroy() {
        executor.shutdownNow();
    }
}