requestor.java

jxme的一些相关程序,主要是手机上程序开发以及手机和计算机通信的一些程序资料,程序编译需要Ant支持

/*
 * Copyright (c) 2001 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: Requestor.java,v 1.3 2002/03/22 04:12:59 chaywood Exp $
 *
 */

package net.jxta.impl.proxy;

import java.io.IOException;

import net.jxta.peergroup.PeerGroup;
import net.jxta.endpoint.EndpointAddress;
import net.jxta.endpoint.EndpointMessenger;
import net.jxta.endpoint.Message;
import net.jxta.endpoint.MessageElement;
import net.jxta.document.MimeMediaType;
import net.jxta.document.Advertisement;
import net.jxta.protocol.PeerAdvertisement;
import net.jxta.protocol.PeerGroupAdvertisement;
import net.jxta.protocol.PipeAdvertisement;

import org.apache.log4j.Category;

public class Requestor {
    private final static Category LOG = Category.getInstance(Requestor.class.getName());

    private PeerGroup group;
    private EndpointAddress address;
    private MessageElement requestId;
    private EndpointMessenger messenger;

    public boolean send(Message message) {
        LOG.debug("send to " + address.toString());

        try {
            messenger.sendMessage(message);
        } catch (IOException e) {
            LOG.warn("Could not send message to requestor " + e.getMessage());
            return false;
        }

        if (ProxyService.LOG_MESSAGES) {
            ProxyService.logMessage(message, LOG);
        }

        return true;
    }

    public boolean send(Advertisement adv, String resultType) {
        LOG.debug("send " + adv);

        Message message = group.getEndpointService().newMessage();

        if (resultType == null) {
            resultType = "";
        }
        message.setString(ProxyService.RESPONSE_TAG, resultType);

        if (requestId != null) {
            message.addElement(requestId);
        }

        if (adv instanceof PeerAdvertisement) {
            PeerAdvertisement peerAdv = (PeerAdvertisement) adv;

            message.setString(ProxyService.TYPE_TAG, ProxyService.TYPE_PEER);
            message.setString(ProxyService.NAME_TAG, peerAdv.getName());
            message.setString(ProxyService.ID_TAG, peerAdv.getPeerID().toString());

            LOG.debug("send PeerAdvertisement name=" + peerAdv.getName() + 
                      " id=" + peerAdv.getPeerID().toString());

        } else if (adv instanceof PeerGroupAdvertisement) {
            PeerGroupAdvertisement groupAdv = (PeerGroupAdvertisement) adv;

            message.setString(ProxyService.TYPE_TAG, ProxyService.TYPE_GROUP);
            message.setString(ProxyService.NAME_TAG, groupAdv.getName());
            message.setString(ProxyService.ID_TAG, groupAdv.getPeerGroupID().toString());

            LOG.debug("send GroupAdvertisement name=" + groupAdv.getName() + 
                      " id=" + groupAdv.getPeerGroupID().toString());

        } else if (adv instanceof PipeAdvertisement) {
            PipeAdvertisement pipeAdv = (PipeAdvertisement) adv;

            message.setString(ProxyService.TYPE_TAG, ProxyService.TYPE_PIPE);
            message.setString(ProxyService.NAME_TAG, pipeAdv.getName());
            message.setString(ProxyService.ID_TAG, pipeAdv.getPipeID().toString());
            message.setString(ProxyService.ARG_TAG, pipeAdv.getType());

            LOG.debug("send PipeAdvertisement name=" + pipeAdv.getName() + 
                      " id=" + pipeAdv.getPipeID().toString() + 
                      " arg=" + pipeAdv.getType());

        } else {
            return false;
        }

        return send(message);
    }

    public boolean notifySuccess() {
        LOG.debug("notifySuccess");

        Message message = group.getEndpointService().newMessage();

        message.setString(ProxyService.RESPONSE_TAG, 
                          ProxyService.RESPONSE_SUCCESS);

        if (requestId != null) {
            message.addElement(requestId);
        }

        return send(message);
    }

    public boolean notifyError(String errorString) {
        LOG.debug("notifyError " + errorString);

        Message message = group.getEndpointService().newMessage();

        if (requestId != null) {
            message.addElement(requestId);
        }

        if (errorString != null && errorString.length() > 0) {
            message.setString(ProxyService.ERROR_MESSAGE_TAG, errorString);
        }

        return send(message);
    }

    public boolean equals(Object obj) {
        LOG.debug(this + " equals " + obj);

        if (obj instanceof Requestor) {
            Requestor dest = (Requestor)obj;
            if (address != null && dest.address != null) {
                if (dest.address.toString().equals(address.toString())) {
                    return true;
                }
            }
        }

        return false;
    }

    public String toString() {
        return "Requestor " + address.toString();
    }

    private Requestor(PeerGroup group, EndpointAddress address, MessageElement requestId) throws IOException {
        this.group = group;
        this.address = address;
        this.requestId = requestId;

        messenger = group.getEndpointService().getMessenger(address);
    }

    public static Requestor createRequestor(PeerGroup group, Message message) throws IOException {
        Requestor requestor = null;
        EndpointAddress address = message.getSourceAddress();

        LOG.debug("create new Requestor - " + address.toString());

        if (address != null) {
            requestor = new Requestor(group, address, 
                                      message.getElement(ProxyService.REQUESTID_TAG));
            message.removeElement(ProxyService.REQUESTID_TAG);
        }

        return requestor;
    }
}