simtcpdatamessage.java

High performance DB query

/*
 * @(#)$Id: SimTCPDataMessage.java,v 1.7 2004/07/02 23:59:22 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 simulator.services.network.tcp;

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

/**
 * Class SimTCPDataMessage
 *
 */
public class SimTCPDataMessage extends SimTCPMessage implements Payload {

    public static long serialVersionUID =
        SerializationManager.getSerialUID(
            "simulator.services.network.tcp.SimTCPDataMessage");
    private SimTCPConnection sourceConnection;
    private Integer sequenceNumber;
    private Payload data;
    private static FreeList freeList =
        new FreeList(new SimTCPDataMessageFactory());

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

        this.sequenceNumber = new Integer(inputBuffer.getInt());
        this.data = SerializationManager.deSerialize(inputBuffer);
    }

    /**
     * Serialize the object into the provided GenericByteBuffer.
     *
     * @param outputBuffer
     * @return
     */
    public long serialize(GenericByteBuffer outputBuffer) {
        super.serialize(outputBuffer);
        outputBuffer.putInt(sequenceNumber.intValue());
        SerializationManager.serialize(outputBuffer, data);

        return serialVersionUID;
    }

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

    private void init(Integer sourcePortNumber, Integer destinationPortNumber,
                      SimTCPConnection sourceConnection,
                      Integer sequenceNumber, Payload data) {
        super.init(sourcePortNumber, destinationPortNumber);

        this.sourceConnection = sourceConnection;
        this.sequenceNumber = sequenceNumber;
        this.data = data;
    }

    /**
     * Method getSourceConnection
     * @return
     */
    protected SimTCPConnection getSourceConnection() {
        return sourceConnection;
    }

    /**
     * Method getSequenceNumber
     * @return
     */
    public Integer getSequenceNumber() {
        return sequenceNumber;
    }

    /**
     * Method getData
     * @return
     */
    public Payload getData() {
        return data;
    }

    /**
     * Method getSize
     * @return
     */
    public int getSize() {
        int dataSize = SerializationManager.getPayloadSize(data);
        int numPackets = dataSize / (TCP_MTU - TCP_OVERHEAD);

        return dataSize + (numPackets * TCP_OVERHEAD);
    }

    /**
     * Method toString
     * @return
     */
    public String toString() {
        return super.toString() + "[DA: DA:" + data + "]";
    }

    /**
     * Method allocate
     *
     * @param sourcePortNumber
     * @param destinationPortNumber
     * @param sourceConnection
     * @param sequenceNumber
     * @param data
     * @return
     */
    public static SimTCPDataMessage allocate(Integer sourcePortNumber,
                                             Integer destinationPortNumber,
                                             SimTCPConnection sourceConnection,
                                             Integer sequenceNumber,
                                             Payload data) {
        SimTCPDataMessage message = (SimTCPDataMessage) freeList.allocate();

        message.init(sourcePortNumber, destinationPortNumber, sourceConnection,
                     sequenceNumber, data);

        return message;
    }

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


/**
 * Class SimTCPDataMessageFactory
 *
 */
class SimTCPDataMessageFactory implements FreeListFactory {

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