/*
* $Header: /home/cvs/jakarta-commons/httpclient/src/test/org/apache/commons/httpclient/server/BidiStreamProxy.java,v 1.1.2.1 2003/12/05 21:02:52 oglueck Exp $
* $Revision: 1.1.2.1 $
* $Date: 2003/12/05 21:02:52 $
*
* ====================================================================
*
* The Apache Software License, Version 1.1
*
* Copyright (c) 1999-2003 The Apache Software Foundation. All rights
* reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* 3. The end-user documentation included with the redistribution, if
* any, must include the following acknowlegement:
* "This product includes software developed by the
* Apache Software Foundation (http://www.apache.org/)."
* Alternately, this acknowlegement may appear in the software itself,
* if and wherever such third-party acknowlegements normally appear.
*
* 4. The names "The Jakarta Project", "Commons", and "Apache Software
* Foundation" must not be used to endorse or promote products derived
* from this software without prior written permission. For written
* permission, please contact apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
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* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Software Foundation. For more
* information on the Apache Software Foundation, please see
* .
*
* [Additional notices, if required by prior licensing conditions]
*
*/
package org.apache.commons.httpclient.server;
import java.io.InputStream;
import java.io.OutputStream;
/**
* Pumps data between a pair of input / output streams. Used to
* connect the two ends (left and right) of a bidirectional communication channel.
* Instances of this class are thread safe.
*
* @author Ortwin Glueck
*/
class BidiStreamProxy {
private StreamProxy leftToRight, rightToLeft;
private int state = 0;
/**
* Sets up a new connection between two peers (left and right)
* @param leftIn input channel of the left peer
* @param leftOut output channel of the left peer
* @param rightIn input channel of the right peer
* @param rightOut output channel of the right peer
*/
public BidiStreamProxy(InputStream leftIn, OutputStream leftOut, InputStream rightIn, OutputStream rightOut) {
leftToRight = new StreamProxy(leftIn, rightOut);
rightToLeft = new StreamProxy(rightIn, leftOut);
}
/**
* Starts pumping the information from left to right and vice versa.
* This is performed asynchronously so this method returns immediately.
*/
public synchronized void start() {
if (state != 0) throw new IllegalStateException("Can not start twice");
leftToRight.start();
rightToLeft.start();
state = 1;
}
/**
* Aborts the communication between the peers and releases all resources.
* Note: The method does not wait for the pump threads to terminate.
*/
public synchronized void abort() {
if (leftToRight != null) leftToRight.abort();
if (rightToLeft != null) rightToLeft.abort();
leftToRight = null;
rightToLeft = null;
}
/**
* Blocks until all data has been copied. Basically calls the
* join method on the pump thread.
* @throws InterruptedException
*/
public void block() throws InterruptedException {
if (state != 1) throw new IllegalStateException("Can not block before started");
leftToRight.block();
rightToLeft.block();
}
}
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