lookup.java

High performance DB query

/*
 * @(#)$Id: Lookup.java,v 1.9 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 services.network.Payload;
import util.BitID;
import util.FreeList;
import util.FreeListFactory;
import util.network.serialization.GenericByteBuffer;
import util.network.serialization.SerializationManager;

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

    public static long serialVersionUID =
        SerializationManager.getSerialUID(
            "overlay.location.chord.payload.Lookup");
    private BitID searchID;
    private long applicationID;
    private static FreeList freeList = new FreeList(new LookupFactory());

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

        this.searchID = new BitID(inputBuffer);
        this.applicationID = inputBuffer.getLong();
    }

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

        return serialVersionUID;
    }

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

    private void init(int messageID, InetSocketAddress sourceSocketAddress,
                      BitID searchID, long applicationID) {
        super.init(messageID, sourceSocketAddress);

        this.searchID = searchID;
        this.applicationID = applicationID;
    }

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

    /**
     * Method getSearchID
     * @return
     */
    public BitID getSearchID() {
        return searchID;
    }

    /**
     * Method getApplicationID
     * @return
     */
    public long getApplicationID() {
        return applicationID;
    }

    /**
     * Method allocate
     *
     * @param messageID
     * @param sourceSocketAddress
     * @param searchID
     * @param applicationID
     * @return
     */
    public static Lookup allocate(int messageID,
                                  InetSocketAddress sourceSocketAddress,
                                  BitID searchID, long applicationID) {
        Lookup message = (Lookup) freeList.allocate();

        message.init(messageID, sourceSocketAddress, searchID, applicationID);

        return message;
    }

    /**
     * Method allocate
     *
     * @param oldMessage
     * @return
     */
    public static Lookup allocate(Lookup oldMessage) {
        Lookup message = (Lookup) freeList.allocate();

        message.init(oldMessage.messageID, oldMessage.sourceSocketAddress,
                     oldMessage.searchID, oldMessage.applicationID);

        return message;
    }

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


/**
 * Class LookupFactory
 *
 */
class LookupFactory implements FreeListFactory {

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