timeoutrecord.java

High performance DB query

/*
 * @(#)$Id: TimeoutRecord.java,v 1.4 2004/07/02 23:59:20 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 overlay.location.can;

import overlay.location.can.payload.Route;
import util.FreeList;
import util.FreeListFactory;

/**
 * The class encapsulates a CAN zone.  The zone object contains real-number
 * intervals denoting the span of an area along each dimension.  The number of
 * dimensions is resourceLocation.can.Can.DIM.
 */
public class TimeoutRecord implements Comparable {

    protected double timeout;
    protected Route message;
    private static FreeList freeList = new FreeList(new TimeoutRecordFactory());

    /**
     * Constructor TimeoutRecord
     */
    protected TimeoutRecord() {}

    private void init(double timeout, Route message) {
        this.timeout = timeout;
        this.message = message;
    }

    /**
     * Method getTimeout
     * @return
     */
    public double getTimeout() {
        return timeout;
    }

    /**
     * Method getMessage
     * @return
     */
    public Route getMessage() {
        return message;
    }

    /**
     * Method updateTimeout
     *
     * @param timeout
     */
    public void updateTimeout(double timeout) {
        this.timeout = timeout;
    }

    /**
     * Method allocate
     *
     * @param timeout
     * @param message
     * @return
     */
    public static TimeoutRecord allocate(double timeout, Route message) {
        TimeoutRecord record = (TimeoutRecord) freeList.allocate();

        record.init(timeout, message);

        return record;
    }

    /**
     * Method free
     *
     * @param record
     */
    public static void free(TimeoutRecord record) {
        freeList.free(record);
    }

    /**
     * Method compareTo
     *
     * @param obj
     * @return
     */
    public int compareTo(Object obj) {
        TimeoutRecord other = (TimeoutRecord) obj;

        if (this.timeout < other.timeout) {
            return -1;
        }

        if (this.timeout > other.timeout) {
            return 1;
        }

        if (this.message.getID() < other.message.getID()) {
            return -1;
        }

        if (this.message.getID() > other.message.getID()) {
            return 1;
        }

        return 0;
    }
}


/**
 * Class TimeoutRecordFactory
 *
 */
class TimeoutRecordFactory implements FreeListFactory {

    /**
     * Method create
     * @return
     */
    public Object create() {
        return new TimeoutRecord();
    }
}