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//******************************************************************************
//
// File: Proxy.java
// Package: edu.rit.pj.cluster
// Unit: Class edu.rit.pj.cluster.Proxy
//
// This Java source file is copyright (C) 2006 by Alan Kaminsky. All rights
// reserved. For further information, contact the author, Alan Kaminsky, at
// ark@cs.rit.edu.
//
// This Java source file is part of the Parallel Java Library ("PJ"). PJ is free
// software; you can redistribute it and/or modify it under the terms of the GNU
// General Public License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// PJ is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
// A PARTICULAR PURPOSE. See the GNU General Public License for more details.
//
// Linking this library statically or dynamically with other modules is making a
// combined work based on this library. Thus, the terms and conditions of the
// GNU General Public License cover the whole combination.
//
// As a special exception, the copyright holders of this library give you
// permission to link this library with independent modules to produce an
// executable, regardless of the license terms of these independent modules, and
// to copy and distribute the resulting executable under terms of your choice,
// provided that you also meet, for each linked independent module, the terms
// and conditions of the license of that module. An independent module is a
// module which is not derived from or based on this library. If you modify this
// library, you may extend this exception to your version of the library, but
// you are not obligated to do so. If you do not wish to do so, delete this
// exception statement from your version.
//
// A copy of the GNU General Public License is provided in the file gpl.txt. You
// may also obtain a copy of the GNU General Public License on the World Wide
// Web at http://www.gnu.org/licenses/gpl.html.
//
//******************************************************************************
package edu.rit.pj.cluster;
import edu.rit.mp.Buf;
import edu.rit.mp.Channel;
import edu.rit.mp.ChannelGroup;
import edu.rit.mp.Status;
import edu.rit.mp.ObjectBuf;
import java.io.IOException;
/**
* Class Proxy is the abstract base class for a proxy object for sending
* messages to a PJ process.
*
* @author Alan Kaminsky
* @version 20-Nov-2006
*/
public abstract class Proxy
{
// Hidden data members.
private ChannelGroup myChannelGroup;
private Channel myChannel;
// Exported constructors.
/**
* Construct a new proxy. The proxy will use the given channel in the given
* channel group to send messages to the far end process.
*
* @param theChannelGroup Channel group.
* @param theChannel Channel.
*/
public Proxy
(ChannelGroup theChannelGroup,
Channel theChannel)
{
myChannelGroup = theChannelGroup;
myChannel = theChannel;
}
// Exported operations.
/**
* Send the given message to this proxy's far end process.
*
* @param theMessage Message.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public void send
(Message theMessage)
throws IOException
{
myChannelGroup.send
(myChannel,
theMessage.getTag(),
ObjectBuf.buffer (theMessage));
}
/**
* Send a message with the given tag and items to this proxy's far end
* process.
*
* @param theTag Message tag.
* @param theSrc Item source buffer.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public void send
(int theTag,
Buf theSrc)
throws IOException
{
myChannelGroup.send (myChannel, theTag, theSrc);
}
/**
* Receive a message from this proxy's far end process. A message will be
* received from this proxy's channel in this proxy's channel group. The
* message must have a tag of 0. The message items are stored in the given
* item destination buffer.
* <P>
* The <TT>receive()</TT> method does not return until the message has been
* fully received.
*
* @param theDst Item destination buffer.
*
* @return Status object giving the outcome of the message reception.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public Status receive
(Buf theDst)
throws IOException
{
return myChannelGroup.receive (myChannel, theDst);
}
/**
* Receive a message with the given tag from this proxy's far end process. A
* message will be received from this proxy's channel in this proxy's
* channel group. If <TT>theTag</TT> is null, a message will be received
* with any tag. The message items are stored in the given item destination
* buffer.
* <P>
* The <TT>receive()</TT> method does not return until the message has been
* fully received.
*
* @param theTag Message tag, or null to receive any tag.
* @param theDst Item destination buffer.
*
* @return Status object giving the outcome of the message reception.
*
* @exception IOException
* Thrown if an I/O error occurred.
*/
public Status receive
(Integer theTag,
Buf theDst)
throws IOException
{
return myChannelGroup.receive (myChannel, theTag, theDst);
}
/**
* Close communication with this proxy's far end process.
*/
public void close()
{
myChannel.close();
}
}
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