/*
* Aleph Toolkit
*
* Copyright 1999, Brown University, Providence, RI.
*
* All Rights Reserved
*
* Permission to use, copy, modify, and distribute this software and its
* documentation for any purpose other than its incorporation into a
* commercial product is hereby granted without fee, provided that the
* above copyright notice appear in all copies and that both that
* copyright notice and this permission notice appear in supporting
* documentation, and that the name of Brown University not be used in
* advertising or publicity pertaining to distribution of the software
* without specific, written prior permission.
*
* BROWN UNIVERSITY DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR ANY
* PARTICULAR PURPOSE. IN NO EVENT SHALL BROWN UNIVERSITY BE LIABLE FOR
* ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
package aleph.comm.tcp;
import aleph.Message;
import aleph.thread.MessageQueue;
import java.io.InterruptedIOException;
/**
* An AutoConnection is a connection from a PE to itself.
*
* @author Maurice Herlihy
* @date February 1999
**/
public class AutoConnection extends Connection {
private static final boolean DEBUG = false; // Oy, va-voy!
private MessageQueue queue; // messages to myself
/**
* Constructor for incoming connection.
* @param socket use this socket
**/
public AutoConnection () {
super();
queue = new MessageQueue();
}
/**
* Close socket and let thread die naturally.
**/
public void close () {}
/**
* Flush output stream.
**/
public void flush () throws InterruptedIOException {}
/**
* Ping output stream.
**/
public boolean ping () {
return true;
}
/**
* Send'em a message.
* @param message what to send
* @exception java.io.IOException something's wrong
**/
public void send (Message message) throws java.io.IOException {
// To avoid bugs caused by sharing between messages and objects, we make
// sure to deliver a serialized/deserialized copy of the message, not the
// message itself.
messagesSent.inc();
queue.enq(message.copy());
}
/**
* Blocking method that pulls in the next message.
* @returns next message
**/
protected Message receive () {
return queue.deq();
}
}