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ActiveMQ example source code file (StubConnection.java)

This example ActiveMQ source code file (StubConnection.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

atomicreference, connection, exception, exception, exceptionresponse, exceptionresponse, io, ioexception, message, message, response, stubconnection, stubconnection, threading, threads, transport, transportlistener

The ActiveMQ StubConnection.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.broker;

import java.io.IOException;
import java.util.concurrent.BlockingQueue;
import java.util.concurrent.LinkedBlockingQueue;
import java.util.concurrent.atomic.AtomicReference;

import org.apache.activemq.Service;
import org.apache.activemq.command.Command;
import org.apache.activemq.command.ExceptionResponse;
import org.apache.activemq.command.Message;
import org.apache.activemq.command.Response;
import org.apache.activemq.command.ShutdownInfo;
import org.apache.activemq.transport.DefaultTransportListener;
import org.apache.activemq.transport.Transport;
import org.apache.activemq.transport.TransportFactory;
import org.apache.activemq.transport.TransportListener;
import org.apache.activemq.util.JMSExceptionSupport;
import org.apache.activemq.util.ServiceSupport;

public class StubConnection implements Service {

    private final BlockingQueue<Object> dispatchQueue = new LinkedBlockingQueue();
    private Connection connection;
    private Transport transport;
    private boolean shuttingDown;
    private TransportListener listener;
    public AtomicReference<Throwable> error = new AtomicReference();

    public StubConnection(BrokerService broker) throws Exception {
        this(TransportFactory.connect(broker.getVmConnectorURI()));
    }

    public StubConnection(Connection connection) {
        this.connection = connection;
    }

    public StubConnection(Transport transport) throws Exception {
        this(transport, null);
    }

    public StubConnection(Transport transport, TransportListener transportListener) throws Exception {
        listener = transportListener;
        this.transport = transport;
        transport.setTransportListener(new DefaultTransportListener() {
            public void onCommand(Object command) {
                try {
                    if (command.getClass() == ShutdownInfo.class) {
                        shuttingDown = true;
                    }
                    StubConnection.this.dispatch(command);
                } catch (Exception e) {
                    onException(new IOException("" + e));
                }
            }

            public void onException(IOException e) {
                if (listener != null) {
                    listener.onException(e);
                }
                error.set(e);
            }
        });
        transport.start();
    }

    protected void dispatch(Object command) throws InterruptedException, IOException {
        if (listener != null) {
            listener.onCommand(command);
        }
        dispatchQueue.put(command);
    }

    public BlockingQueue<Object> getDispatchQueue() {
        return dispatchQueue;
    }

    public void send(Command command) throws Exception {
        if (command instanceof Message) {
            Message message = (Message)command;
            message.setProducerId(message.getMessageId().getProducerId());
        }
        command.setResponseRequired(false);
        if (connection != null) {
            Response response = connection.service(command);
            if (response != null && response.isException()) {
                ExceptionResponse er = (ExceptionResponse)response;
                throw JMSExceptionSupport.create(er.getException());
            }
        } else if (transport != null) {
            transport.oneway(command);
        }
    }

    public Response request(Command command) throws Exception {
        if (command instanceof Message) {
            Message message = (Message)command;
            message.setProducerId(message.getMessageId().getProducerId());
        }
        command.setResponseRequired(true);
        if (connection != null) {
            Response response = connection.service(command);
            if (response != null && response.isException()) {
                ExceptionResponse er = (ExceptionResponse)response;
                throw JMSExceptionSupport.create(er.getException());
            }
            return response;
        } else if (transport != null) {
            Response response = (Response)transport.request(command);
            if (response != null && response.isException()) {
                ExceptionResponse er = (ExceptionResponse)response;
                throw JMSExceptionSupport.create(er.getException());
            }
            return response;
        }
        return null;
    }

    public Connection getConnection() {
        return connection;
    }

    public Transport getTransport() {
        return transport;
    }

    public void start() throws Exception {
    }

    public void stop() throws Exception {
        shuttingDown = true;
        if (transport != null) {
            try {
                transport.oneway(new ShutdownInfo());
            } catch (IOException e) {
            }
            ServiceSupport.dispose(transport);
        }
    }

    public TransportListener getListener() {
        return listener;
    }

    public void setListener(TransportListener listener) {
        this.listener = listener;
    }
}




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