messagecopier.java

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/*
 * Java Network Programming, Second Edition
 * Merlin Hughes, Michael Shoffner, Derek Hamner
 * Manning Publications Company; ISBN 188477749X
 *
 * http://nitric.com/jnp/
 *
 * Copyright (c) 1997-1999 Merlin Hughes, Michael Shoffner, Derek Hamner;
 * all rights reserved; see license.txt for details.
 */

import java.io.*;

public class MessageCopier extends Thread {
  static private int copierNumber;
  static private synchronized int nextCopierNum () { return copierNumber ++; }

  protected MessageInput messageIn;
  protected MessageOutput messageOut;

  public MessageCopier (MessageInput messageIn, MessageOutput messageOut) {
    super ("MessageCopier-" + nextCopierNum ());
    this.messageIn = messageIn;
    this.messageOut = messageOut;
  }

  protected boolean finished;

  public void finish () {
    finished = true;
    interrupt ();
  }

  public void run () {
    try {
      copy ();
    } catch (IOException ex) {
      if (!finished)
        ex.printStackTrace ();
    }
  }

  protected void copy () throws IOException {
    while (!interrupted ()) {
      byte[] buffer;
      synchronized (messageIn) {
        messageIn.receive ();
        buffer = new byte[messageIn.available ()];
        messageIn.readFully (buffer);
      }
      synchronized (messageOut) {
        messageOut.write (buffer);
        messageOut.send ();
      }
    }
  }
}