putmessage.java

High performance DB query

/*
 * @(#)$Id: PutMessage.java,v 1.8 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.provider.basic;

import services.network.Payload;
import util.BitID;
import util.FreeList;
import util.FreeListFactory;
import util.network.serialization.GenericByteBuffer;
import util.network.serialization.SerializationManager;

/**
 * Class PutMessage
 *
 */
public class PutMessage extends ProviderMessage {

    public static long serialVersionUID =
        SerializationManager.getSerialUID("overlay.provider.basic.PutMessage");

    // the instance ID of the item
    private int iid;

    // the item's lifetime
    private long lifetime;

    // the actual item
    private Payload item;

    // free list of objects for better memory management
    private static FreeList freeList = new FreeList(new PutMessageFactory());

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

        this.iid = inputBuffer.getInt();
        this.lifetime = inputBuffer.getLong();
        this.item = SerializationManager.deSerialize(inputBuffer);
        this.size += Payload.INT_SIZE + Payload.LONG_SIZE;

        if (this.item != null) {
            this.size += SerializationManager.getPayloadSize(this.item);
        }
    }

    /**
     * Serialize the object into the provided GenericByteBuffer.
     *
     * @param outputBuffer
     * @return
     */
    public long serialize(GenericByteBuffer outputBuffer) {
        super.serialize(outputBuffer);
        outputBuffer.putInt(iid);
        outputBuffer.putLong(lifetime);
        SerializationManager.serialize(outputBuffer, item);

        return serialVersionUID;
    }

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

    private void init(Integer messageID, String ns, String rid,
                      BitID locationID, int iid, long lifetime, Payload item) {
        super.init(messageID, ns, rid, locationID);

        this.iid = iid;
        this.lifetime = lifetime;
        this.item = item;

        // set the size
        size += Payload.INT_SIZE + Payload.LONG_SIZE;

        if (item != null) {
            size += SerializationManager.getPayloadSize(item);
        }
    }

    /**
     * Method getIID
     * @return
     */
    public int getIID() {
        return iid;
    }

    /**
     * Method getLifetime
     * @return
     */
    public long getLifetime() {
        return lifetime;
    }

    /**
     * Method getItem
     * @return
     */
    public Payload getItem() {
        return item;
    }

    /**
     * Method allocate
     *
     * @param messageID
     * @param ns
     * @param rid
     * @param locationID
     * @param iid
     * @param lifetime
     * @param item
     * @return
     */
    public static PutMessage allocate(Integer messageID, String ns, String rid,
                                      BitID locationID, int iid, long lifetime,
                                      Payload item) {
        PutMessage message = (PutMessage) freeList.allocate();

        message.init(messageID, ns, rid, locationID, iid, lifetime, item);

        return message;
    }

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


/**
 * Class PutMessageFactory
 *
 */
class PutMessageFactory implements FreeListFactory {

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