ActiveMQ example source code file (XmppTransport.java)

This example ActiveMQ source code file (XmppTransport.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" ^TM.

Java - ActiveMQ tags/keywords

brokerinfo, command, exception, io, ioexception, ioexception, net, network, override, startelement, string, string, xmlevent, xmlstreamexception, xmlstreamexception, xmpptransport, xmpptransport

The ActiveMQ XmppTransport.java source code

/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.activemq.transport.xmpp;

import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.net.Socket;
import java.net.URI;

import javax.net.SocketFactory;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.JAXBException;
import javax.xml.bind.Marshaller;
import javax.xml.bind.Unmarshaller;
import javax.xml.namespace.QName;
import javax.xml.stream.Location;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLReporter;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.stream.events.Attribute;
import javax.xml.stream.events.StartElement;
import javax.xml.stream.events.XMLEvent;

import ietf.params.xml.ns.xmpp_sasl.Mechanisms;

import org.apache.activemq.command.BrokerInfo;
import org.apache.activemq.command.Command;
import org.apache.activemq.transport.tcp.TcpBufferedInputStream;
import org.apache.activemq.transport.tcp.TcpBufferedOutputStream;
import org.apache.activemq.transport.tcp.TcpTransport;
import org.apache.activemq.util.IOExceptionSupport;
import org.apache.activemq.util.ServiceStopper;
import org.apache.activemq.wireformat.WireFormat;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.jabber.etherx.streams.Features;

/**
 * 
 */
public class XmppTransport extends TcpTransport {
    protected static final QName ATTRIBUTE_TO = new QName("to");

    private static final transient Logger LOG = LoggerFactory.getLogger(XmppTransport.class);

    protected OutputStream outputStream;
    protected InputStream inputStream;

    private static JAXBContext context;
    private XMLEventReader xmlReader;
    private Unmarshaller unmarshaller;
    private Marshaller marshaller;
    private XMLStreamWriter xmlWriter;
    private String to = "client";
    private ProtocolConverter converter;
    private String from = "localhost";
    private String brokerId = "broker-id-1";

    public XmppTransport(WireFormat wireFormat, Socket socket) throws IOException {
        super(wireFormat, socket);
        init();
    }

    public XmppTransport(WireFormat wireFormat, SocketFactory socketFactory, URI uri, URI uri1) throws IOException {
        super(wireFormat, socketFactory, uri, uri1);
        init();
    }

    private void init() {
        LOG.debug("Creating new instance of XmppTransport");
        converter = new ProtocolConverter(this);
    }

    @Override
    public void oneway(Object object) throws IOException {
        if (object instanceof Command) {
            Command command = (Command)object;

            if (command instanceof BrokerInfo) {
                BrokerInfo brokerInfo = (BrokerInfo)command;

                brokerId = brokerInfo.getBrokerId().toString();
                from = brokerInfo.getBrokerName();
                try {
                    writeOpenStream(brokerId, from);
                } catch (XMLStreamException e) {
                    throw IOExceptionSupport.create(e);
                }
            } else {
                try {
                    converter.onActiveMQCommand(command);
                } catch (IOException e) {
                    throw e;
                } catch (Exception e) {
                    throw IOExceptionSupport.create(e);
                }
            }
        } else {
            LOG.warn("Unkown command: " + object);
        }
    }

    /**
     * Marshalls the given POJO to the client
     */
    public void marshall(Object command) throws IOException {
        if (isStopped() || isStopping()) {
            LOG.warn("Not marshalling command as shutting down: " + command);
            return;
        }
        try {
            marshaller.marshal(command, xmlWriter);
            xmlWriter.flush();
            outputStream.flush();
        } catch (JAXBException e) {
            throw IOExceptionSupport.create(e);
        } catch (XMLStreamException e) {
            throw IOExceptionSupport.create(e);
        }
    }

    @Override
    public void doRun() throws IOException {
        LOG.debug("XMPP consumer thread starting");
        try {
            XMLInputFactory xif = XMLInputFactory.newInstance();
            xif.setXMLReporter(new XMLReporter() {
                public void report(String message, String errorType, Object relatedInformation, Location location) throws XMLStreamException {
                    LOG.warn(message + " errorType: " + errorType + " relatedInfo: " + relatedInformation);
                }
            });

            xmlReader = xif.createXMLEventReader(inputStream);

            XMLEvent docStart = xmlReader.nextEvent();

            XMLEvent rootElement = xmlReader.nextTag();

            if (rootElement instanceof StartElement) {
                StartElement startElement = (StartElement)rootElement;
                Attribute toAttribute = startElement.getAttributeByName(ATTRIBUTE_TO);
                if (toAttribute != null) {
                    to = toAttribute.getValue();
                }
            }
            while (true) {
                if (isStopped()) {
                    break;
                }

                XMLEvent event = xmlReader.peek();
                if (event.isStartElement()) {
                    // unmarshal a new object
                    Object object = unmarshaller.unmarshal(xmlReader);
                    if (object != null) {
                        LOG.debug("Unmarshalled new incoming event - " + object.getClass().getName());
                        converter.onXmppCommand(object);
                    }
                } else {
                    if (event.getEventType() == XMLEvent.END_ELEMENT) {
                        break;
                    } else if (event.getEventType() == XMLEvent.END_ELEMENT || event.getEventType() == XMLEvent.END_DOCUMENT) {
                        break;
                    } else {
                        xmlReader.nextEvent();
                    }

                }
            }
        } catch (Exception e) {
            throw IOExceptionSupport.create(e);
        }
    }

    public String getFrom() {
        return from;
    }

    @Override
    protected void doStop(ServiceStopper stopper) throws Exception {
        if (xmlWriter != null) {
            try {
                xmlWriter.writeEndElement();
                xmlWriter.writeEndDocument();
                xmlWriter.close();
            } catch (XMLStreamException e) {
                // the client may have closed first so ignore this
                LOG.info("Caught trying to close transport: " + e, e);
            }
        }
        if (xmlReader != null) {
            try {
                xmlReader.close();
            } catch (XMLStreamException e) {
                // the client may have closed first so ignore this
                LOG.info("Caught trying to close transport: " + e, e);
            }
        }
        super.doStop(stopper);
    }

    @Override
    protected void initializeStreams() throws Exception {
        // TODO it would be preferable to use class discovery here!
        if ( context == null ) {
            context = JAXBContext.newInstance(
                    "jabber.server:" +
                    "jabber.server.dialback:" +
                    "jabber.client:" +
                    "jabber.iq._private:" +
                    "jabber.iq.auth:" +
                    "jabber.iq.gateway:" +
                    "jabber.iq.version:" +
                    "jabber.iq.roster:" +
                    "jabber.iq.pass:" +
                    "jabber.iq.last:" +
                    "jabber.iq.oob:" +
                    "jabber.iq.time:" +
                    "storage.rosternotes:" +
                    "ietf.params.xml.ns.xmpp_streams:" +
                    "ietf.params.xml.ns.xmpp_sasl:" +
                    "ietf.params.xml.ns.xmpp_stanzas:" +
                    "ietf.params.xml.ns.xmpp_bind:" +
                    "ietf.params.xml.ns.xmpp_tls:" +
                    "org.jabber.protocol.muc:" +
                    "org.jabber.protocol.rosterx:" +
                    "org.jabber.protocol.disco_info:" +
                    "org.jabber.protocol.disco_items:" +
                    "org.jabber.protocol.activity:" +
                    "org.jabber.protocol.amp_errors:" +
                    "org.jabber.protocol.amp:" +
                    "org.jabber.protocol.address:" +
                    "org.jabber.protocol.muc_user:" +
                    "org.jabber.protocol.muc_admin:" +
                    "org.jabber.etherx.streams");
        }
        inputStream = new TcpBufferedInputStream(socket.getInputStream(), 8 * 1024);
        outputStream = new TcpBufferedOutputStream(socket.getOutputStream(), 16 * 1024);

        unmarshaller = context.createUnmarshaller();
        marshaller = context.createMarshaller();
        marshaller.setProperty(Marshaller.JAXB_FRAGMENT, true);
    }

    protected void writeOpenStream(String id, String from) throws IOException, XMLStreamException {
        LOG.debug("Sending initial stream element");

        XMLOutputFactory factory = XMLOutputFactory.newInstance();
        // factory.setProperty(XMLOutputFactory.IS_REPAIRING_NAMESPACES, true);
        xmlWriter = factory.createXMLStreamWriter(outputStream);
        xmlWriter.writeStartDocument();
        xmlWriter.writeStartElement("stream", "stream", "http://etherx.jabber.org/streams");
        xmlWriter.writeDefaultNamespace("jabber:client");
        xmlWriter.writeNamespace("stream", "http://etherx.jabber.org/streams");
        xmlWriter.writeAttribute("version", "1.0");
        xmlWriter.writeAttribute("id", id);
        if (to == null) {
            to = "client";
        }
        xmlWriter.writeAttribute("to", to);
        xmlWriter.writeAttribute("from", from);

        // now lets write the features
        Features features = new Features();

        // TODO support TLS
        // features.getAny().add(new Starttls());

        //Mechanisms mechanisms = new Mechanisms();

        // TODO support SASL
        // mechanisms.getMechanism().add("DIGEST-MD5");
        // mechanisms.getMechanism().add("PLAIN");
        //features.getAny().add(mechanisms);
        features.getAny().add(new ietf.params.xml.ns.xmpp_bind.ObjectFactory().createBind());
        features.getAny().add(new ietf.params.xml.ns.xmpp_session.ObjectFactory().createSession(""));
        marshall(features);

        LOG.debug("Initial stream element sent!");
    }

}