notify.java

High performance DB query

/*
 * @(#)$Id: Notify.java,v 1.7 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.chord.payload;

import java.net.InetSocketAddress;
import util.BitID;
import util.FreeList;
import util.FreeListFactory;
import util.network.serialization.GenericByteBuffer;
import util.network.serialization.SerializationManager;

/**
 * Class Notify
 *
 */
public class Notify extends ChordMessage {

    public static long serialVersionUID =
        SerializationManager.getSerialUID(
            "overlay.location.chord.payload.Notify");
    private BitID predecessorID;
    private static FreeList freeList = new FreeList(new NotifyFactory());

    /**
     * DeSerialize the object from the provided GenericByteBuffer.
     *
     * @param inputBuffer
     */
    public Notify(GenericByteBuffer inputBuffer) {
        super(inputBuffer);

        this.predecessorID = new BitID(inputBuffer);
    }

    /**
     * Serialize the object into the provided GenericByteBuffer.
     *
     * @param outputBuffer
     * @return
     */
    public long serialize(GenericByteBuffer outputBuffer) {
        super.serialize(outputBuffer);
        predecessorID.serialize(outputBuffer);

        return serialVersionUID;
    }

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

    private void init(int messageID, InetSocketAddress sourceSocketAddress,
                      BitID predecessorID) {
        super.init(messageID, sourceSocketAddress);

        this.predecessorID = predecessorID;
    }

    /**
     * Method getSize
     * @return
     */
    public int getSize() {
        return super.getSize() + predecessorID.getSize();
    }

    /**
     * Method getPredecessorID
     * @return
     */
    public BitID getPredecessorID() {
        return predecessorID;
    }

    /**
     * Method allocate
     *
     * @param messageID
     * @param sourceSocketAddress
     * @param predecessorID
     * @return
     */
    public static Notify allocate(int messageID,
                                  InetSocketAddress sourceSocketAddress,
                                  BitID predecessorID) {
        Notify message = (Notify) freeList.allocate();

        message.init(messageID, sourceSocketAddress, predecessorID);

        return message;
    }

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


/**
 * Class NotifyFactory
 *
 */
class NotifyFactory implements FreeListFactory {

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