multiplexoutputstream.java

JAVA网络编程技术内幕一书的源代码

/*
 * 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 MultiplexOutputStream extends MessageOutput {
  protected MessageOutput messageOut;
  protected ByteArrayOutputStream byteArrayOut;
  protected String label;

  public MultiplexOutputStream (MessageOutput messageOut, String label) {
    super (new ByteArrayOutputStream ());
    byteArrayOut = (ByteArrayOutputStream) out;
    this.messageOut = messageOut;
    this.label = label;
  }

  public void send () throws IOException {
    synchronized (messageOut) {
      messageOut.writeUTF (label);
      byteArrayOut.writeTo (messageOut);
      messageOut.send ();
    }
    byteArrayOut.reset ();
  }

  public void send (String[] dsts) throws IOException {
    synchronized (messageOut) {
      messageOut.writeUTF (label);
      byteArrayOut.writeTo (messageOut);
      messageOut.send (dsts);
    }
    byteArrayOut.reset ();
  }
}