endpointremoteshellconsole.java

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/*
 * Copyright (c) 2002 Sun Microsystems, Inc.  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 acknowledgment:
 *       "This product includes software developed by the
 *       Sun Microsystems, Inc. for Project JXTA."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Sun", "Sun Microsystems, Inc.", "JXTA" and "Project JXTA" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact Project JXTA at http://www.jxta.org.
 *
 * 5. Products derived from this software may not be called "JXTA",
 *    nor may "JXTA" appear in their name, without prior written
 *    permission of Sun.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL SUN MICROSYSTEMS OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of Project JXTA.  For more
 * information on Project JXTA, please see
 * <http://www.jxta.org/>.
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: EndpointRemoteShellConsole.java,v 1.9 2006/06/21 18:20:22 bondolo Exp $
 */

package net.jxta.impl.shell.bin.rshd;

import java.util.ArrayList;
import java.util.List;

import java.io.IOException;
import java.io.InterruptedIOException;

import java.util.logging.Level;
import java.util.logging.Logger;

import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointListener;
import net.jxta.endpoint.EndpointService;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageElement;
import net.jxta.endpoint.Messenger;
import net.jxta.endpoint.StringMessageElement;
import net.jxta.peergroup.PeerGroup;

import net.jxta.impl.shell.ShellApp;
import net.jxta.impl.shell.ShellConsole;

public class EndpointRemoteShellConsole extends ShellConsole implements EndpointListener {
    
    /**
     *  Log4J Logger
     **/
    private static final transient java.util.logging.Logger LOG = java.util.logging.Logger.getLogger(EndpointRemoteShellConsole.class.getName());;
    
    private final static String CursorUp = Byte.toString((byte) 16);
    private final static String CursorDown = Byte.toString((byte) 14);
    
    private RemoteShellSession session = null;
    private final String myAddress;
    private final String remoteAddress;
    private EndpointService endpoint = null;
    
    private String prompt = null;
    
    private Messenger messenger = null;
    private List in = new ArrayList();
    
    public EndpointRemoteShellConsole( ShellApp rootApp, RemoteShellSession session, String myAddress, String remoteAddress, EndpointService endpoint) throws IOException {
        super( rootApp, remoteAddress );
        
        this.session = session;
        this.myAddress = myAddress;
        this.remoteAddress = remoteAddress;
        this.endpoint = endpoint;
        
        try {
            endpoint.addIncomingMessageListener(this, rshd.NAME, myAddress);
        } catch (Exception ez1) {
            throw new IOException( "Could not register listener" );
        }
        
        EndpointAddress addr = new EndpointAddress(remoteAddress);
        this.messenger = endpoint.getMessenger(addr);
        if (this.messenger == null) {
            throw new IOException( "No messenger for " + addr );
        }
        
        Message msg = new Message();
        msg.addMessageElement((String) null,
        new StringMessageElement(rshd.SESSION_GRANTED, rshd.NAME + "/" + myAddress, null));
        
        this.messenger.sendMessage(msg);
    }
    
    /**
     *  {@inheritDoc}
     **/
    public synchronized void processIncomingMessage(Message msg, EndpointAddress srcAddr, EndpointAddress dstAddr) {
        
        MessageElement el = msg.getMessageElement( null, rshd.DATA );
        if (el != null) {
            synchronized( in ) {
                in.add(el.toString());
                in.notify();
            }
            
            session.updateActivity();
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    protected void finalize() {
        destroy();
    }
    
    /**
     *  {@inheritDoc}
     **/
    public synchronized void destroy() {
        endpoint.removeIncomingMessageListener(rshd.NAME, myAddress);
        if (this.messenger != null) {
            this.messenger.close();
            this.messenger = null;
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    public String read() throws InterruptedIOException {
               
        synchronized( in ) {
            while( in.isEmpty() ) {
                if( null != prompt ) {
                    try {
                        messenger.waitState( Messenger.IDLE, 100 );
                    } catch ( InterruptedException woken ) {
                        Thread.interrupted();
                    }
                    
                    write( prompt );
                    prompt = null;
                }
                
                try {
                    in.wait( 0 );
                } catch (InterruptedException ez1) {
                    InterruptedIOException woken = new InterruptedIOException( "Interrupted during read" );
                    woken.initCause( ez1 );
                    throw woken;
                }
            }
            
            return (String) in.remove(0);
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    public void write(String data) {
        
        try {
            Message msg = new Message();
            msg.addMessageElement((String) null, new StringMessageElement( rshd.DATA, data, null ) );
            
            messenger.sendMessage(msg);
            
            session.updateActivity();
        } catch (Exception ez1) {
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    public String getCursorUpName(){
        return CursorUp;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public String getCursorDownName(){
        return CursorDown;
    }
    
    /**
     *  {@inheritDoc}
     **/
    public void clear() {
        write( "\u000c" );
    }
    
    /**
     *  {@inheritDoc}
     **/
    public void setPrompt( String newPrompt ) {
        synchronized( in ) {
            prompt = newPrompt;
            in.notify();
        }
    }
    
    /**
     *  {@inheritDoc}
     **/
    public synchronized void setCommandLine(String cmd){
        System.out.println("setCommandLine NOT YET IMPLEMENTED");
    }
    
    /**
     *  {@inheritDoc}
     **/
    public void setStatusGroup(PeerGroup group) {
        System.out.println("setStatusGroup NOT YET IMPLEMENTED");
    }
}