org.rifidi.emulator.reader.llrp.keepalive.KeepAliveController.java Source code

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Here is the source code for org.rifidi.emulator.reader.llrp.keepalive.KeepAliveController.java

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/*
 *  KeepAliveController.java
 *
 *  Created:   Oct 3, 2007
 *  Project:   RiFidi Emulator - A Software Simulation Tool for RFID Devices
 *              http://www.rifidi.org
 *              http://rifidi.sourceforge.net
 *  Copyright:   Pramari LLC and the Rifidi Project
 *  License:   Lesser GNU Public License (LGPL)
 *              http://www.opensource.org/licenses/lgpl-license.html
 *  Author:   kyle
 */
package org.rifidi.emulator.reader.llrp.keepalive;

import java.util.ArrayList;
import java.util.Observable;
import java.util.Observer;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.rifidi.emulator.reader.llrp.report.LLRPReportController;
import org.rifidi.emulator.reader.llrp.report.LLRPReportControllerFactory;
import org.rifidi.emulator.reader.llrp.trigger.PeriodicTrigger;
import org.rifidi.emulator.reader.llrp.trigger.TriggerObservable;

/**
 * This class is a controller for sending out KeepAlive events.
 * 
 * @author kyle
 * 
 */
public class KeepAliveController implements Observer {

    private TriggerObservable triggerObservable;

    private PeriodicTrigger trigger;

    private LLRPReportController reportController;

    private String readerName;

    /**
     * The logger for this class.
     */
    private static Log logger = LogFactory.getLog(KeepAliveController.class);

    public KeepAliveController(String readerName) {
        triggerObservable = new TriggerObservable(false);
        triggerObservable.addObserver(this);
        this.readerName = readerName;

    }

    public void startKeepAlives(int period) {
        trigger = new PeriodicTrigger(period, period);
        trigger.setTriggerObservable(this.triggerObservable);
        trigger.startTimer();
    }

    public void stopKeepAlives() {
        if (trigger != null) {
            trigger.stopTimer();
            trigger = null;
        }
    }

    private void sendKeepAlive() {
        if (reportController == null) {
            reportController = LLRPReportControllerFactory.getInstance().getReportController(readerName);
        }
        reportController.sendKeepAlive();
        triggerObservable.fireStopTrigger(this.getClass());
    }

    /*
     * (non-Javadoc)
     * 
     * @see java.util.Observer#update(java.util.Observable, java.lang.Object)
     */
    public void update(Observable arg0, Object arg1) {
        ArrayList<Object> extraInfo;
        boolean state;
        Class callingClass;

        try {
            extraInfo = (ArrayList<Object>) arg1;
            state = (Boolean) extraInfo.get(0);
            callingClass = (Class) extraInfo.get(1);

            if (state == true) {
                if (callingClass.equals(PeriodicTrigger.class)) {
                    logger.debug("Keepalive Trigger " + "fired by Periodic Trigger");
                }

                sendKeepAlive();
            } else {
                logger.debug("keepalive observable state reset");
            }

        } catch (Exception e) {
            logger.debug("There was an error when trying to update "
                    + "KeepAlive.  Check to make sure the TriggerObservable's "
                    + "extra informaiton was formed correctly");

        }

    }

    public void suspend() {
        logger.debug("Keep alives are suspended");
        if (trigger != null) {
            trigger.suspend();
        }
    }

    public void resume() {
        logger.debug("Keep alives are suspended");
        if (trigger != null) {
            trigger.resume();
        }
    }
}