asynctimer.java

High performance DB query

/*
 * @(#)$Id: AsyncTimer.java,v 1.7 2005/07/09 20:11:14 huebsch Exp $
 *
 * Copyright (c) 2001-2004 Regents of the University of California.
 * All rights reserved.
 *
 * This file is distributed under the terms in the attached BERKELEY-LICENSE
 * file. If you do not find these files, copies can be found by writing to:
 * Computer Science Division, Database Group, Universite of California,
 * 617 Soda Hall #1776, Berkeley, CA 94720-1776. Attention: Berkeley License
 *
 * Copyright (c) 2003-2004 Intel Corporation. All rights reserved.
 *
 * This file is distributed under the terms in the attached INTEL-LICENSE file.
 * If you do not find these files, copies can be found by writing to:
 * Intel Research Berkeley, 2150 Shattuck Avenue, Suite 1300,
 * Berkeley, CA, 94704.  Attention:  Intel License Inquiry.
 */


package runtime.services.timer;

import java.text.DateFormat;
import java.util.Date;
import org.apache.log4j.Logger;
import runtime.schedulers.ASyncCore;
import runtime.schedulers.ASyncCore.TimerCB;
import services.Output;
import services.timer.Timer;
import services.timer.TimerClient;
import util.logging.StructuredLogMessage;

/**
 * Class AsyncTimer
 *
 */
public class AsyncTimer implements Timer, TimerCB {

    private static Logger logger = Logger.getLogger(AsyncTimer.class);
    private ASyncCore timerCore;
    private long timeOffset;
    private Object syncObject;

    /**
     * Constructor AsyncTimer
     *
     * @param timerCore
     * @param beginTime
     * @param ignoreBeginTime
     * @param syncObject
     */
    public AsyncTimer(ASyncCore timerCore, String beginTime,
                      boolean ignoreBeginTime, Object syncObject) {
        this.timerCore = timerCore;

        if (ignoreBeginTime) {
            this.timeOffset = System.currentTimeMillis();
        } else {
            try {
                DateFormat beginDate =
                    DateFormat.getDateTimeInstance(DateFormat.SHORT,
                                                   DateFormat.SHORT);

                beginDate.setLenient(true);

                this.timeOffset =
                    ((Date) beginDate.parseObject(beginTime)).getTime();
            } catch (Exception exception) {
                throw new RuntimeException("TIMER: Unable to parse begin time: "
                                           + beginTime + ", "
                                           + exception.getMessage());
            }
        }

        this.syncObject = syncObject;
    }

    /**
     * Method schedule
     *
     * @param relativeTime
     * @param data
     * @param client
     */
    public void schedule(double relativeTime, Object data, TimerClient client) {
        double executionTime = relativeTime + getCurrentTime();
        ActualTimerEvent event = ActualTimerEvent.allocate(executionTime, data,
                                     client);

        timerCore.register_timer((long) (relativeTime * 1000D), this, event);
    }

    /**
     * Method scheduleMS
     *
     * @param relativeTimeMS
     * @param data
     * @param client
     */
    public void scheduleMS(long relativeTimeMS, Object data,
                           TimerClient client) {
        long executionTime = relativeTimeMS + getCurrentTimeMS();
        ActualTimerEvent event = ActualTimerEvent.allocate(executionTime, data,
                                     client);

        timerCore.register_timer(relativeTimeMS, this, event);
    }

    /**
     * Method getCurrentTime
     * @return
     */
    public double getCurrentTime() {
        return (((double) (System.currentTimeMillis() - timeOffset)) / 1000D);
    }

    /**
     * Method getCurrentTimeMS
     * @return
     */
    public long getCurrentTimeMS() {
        return System.currentTimeMillis() - timeOffset;
    }

    /**
     * Method cb
     *
     * @param user_data
     */
    public void timer_cb(Object user_data) {
        Integer eventID = StructuredLogMessage.getReference();
        ActualTimerEvent event = (ActualTimerEvent) user_data;

        // run the event
        TimerClient client = event.getClient();

        if (Output.debuggingEnabled) {
            logger.debug(
                new StructuredLogMessage(
                    eventID, "Executing Timer Callback Event", new Object[]{"d",
                                                                            client.getClass().getName()}, new Object[]{
                                                                            "p",
                                                                            client}));
        }

        synchronized (syncObject) {
            client.handleClock(event.getData());
        }

        if (Output.debuggingEnabled) {
            logger.debug(
                new StructuredLogMessage(
                    eventID, "Timer Callback Event Finished", new Object[]{"d",
                                                                           client.getClass().getName()}, new Object[]{
                                                                           "p",
                                                                           client}));
        }

        ActualTimerEvent.free(event);
    }
}