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The JXTA Shell is a sample application that demonstrates key concepts of JXTA JXSE. The JXTA Shell enables users to interact with the JXTA platform through a command-line interpreter. Much like the UNIX® shell, the JXTA Shell is useful for accessing and managing core platform objects (peers, groups, pipes), debugging communications problems, checking the status of peers and/or peer groups, and communicating with other JXTA services and applications. As in UNIX®, the JXTA shell allows users to "pipe" shell commands together connecting commands "on-the-fly." Pipes in Project JXTA are useful for collecting information at one peer and perhaps processing the command at another.

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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
 * .
 *
 * This license is based on the BSD license adopted by the Apache Foundation.
 *
 * $Id: EndpointRemoteShellConsole.java,v 1.11 2007/02/09 23:12:42 hamada Exp $
 */

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

import net.jxta.endpoint.*;
import net.jxta.impl.shell.ShellApp;
import net.jxta.impl.shell.ShellConsole;
import net.jxta.peergroup.PeerGroup;

import java.io.IOException;
import java.io.InterruptedIOException;
import java.util.ArrayList;
import java.util.List;

public class EndpointRemoteShellConsole extends ShellConsole implements EndpointListener {

    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 EndpointService endpoint = null;

    private String prompt = null;

    private Messenger messenger = null;
    private final 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.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(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}
     */
    @Override
    protected void finalize() throws Throwable {
        destroy();
        super.finalize();
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void destroy() {
        endpoint.removeIncomingMessageListener(rshd.NAME, myAddress);
        if (this.messenger != null) {
            this.messenger.close();
            this.messenger = null;
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    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 in.remove(0);
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void write(String data) {

        try {
            Message msg = new Message();
            msg.addMessageElement(null, new StringMessageElement(rshd.DATA, data, null));

            messenger.sendMessage(msg);

            session.updateActivity();
        } catch (Exception ez1) {
          //ignored
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getCursorUpName() {
        return CursorUp;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public String getCursorDownName() {
        return CursorDown;
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void clear() {
        write("\u000c");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void setPrompt(String newPrompt) {
        synchronized (in) {
            prompt = newPrompt;
            in.notify();
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public synchronized void setCommandLine(String cmd) {
        System.out.println("setCommandLine NOT YET IMPLEMENTED");
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void setStatusGroup(PeerGroup group) {
        System.out.println("setStatusGroup NOT YET IMPLEMENTED");
    }
}