ActiveMQ example source code file (AbstractAmqCommand.java)

This example ActiveMQ source code file (AbstractAmqCommand.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

activemqconnectionfactory, connection, connection, illegalargumentexception, illegalstateexception, jmsexception, list, net, network, string, uri, uri, url, url, util, you, you

The ActiveMQ AbstractAmqCommand.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.console.command;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.jms.Connection;
import javax.jms.ConnectionFactory;
import javax.jms.JMSException;

import org.apache.activemq.ActiveMQConnectionFactory;

public abstract class AbstractAmqCommand extends AbstractCommand {
    private URI brokerUrl;
    private ConnectionFactory factory;
    private final List<Connection> connections = new ArrayList();

    /**
     * Establishes a connection to the remote broker specified by the broker
     * url.
     * 
     * @return - connection to the broker
     * @throws JMSException
     */
    protected Connection createConnection() throws JMSException {
        if (getBrokerUrl() == null) {
            context
                .printException(new IllegalStateException("You must specify a broker "
                                                          + "URL to connect to using the --amqurl option."));
            return null;
        }

        if (factory == null) {
            factory = new ActiveMQConnectionFactory(getBrokerUrl());
        }

        Connection conn = factory.createConnection();
        connections.add(conn);

        return conn;
    }

    /**
     * Establishes a connection to the remote broker specified by the broker
     * url.
     * 
     * @param username - username for the connection
     * @param password - password for the connection
     * @return - connection to the broker
     * @throws JMSException
     */
    protected Connection createConnection(String username, String password) throws JMSException {
        if (getBrokerUrl() == null) {
            context
                .printException(new IllegalStateException(
                                                          "You must specify a broker URL to connect to using the --amqurl option."));
            return null;
        }

        if (factory == null) {
            factory = new ActiveMQConnectionFactory(getBrokerUrl());
        }

        Connection conn = factory.createConnection(username, password);
        connections.add(conn);
        conn.start();

        return conn;
    }

    /**
     * Close all created connections.
     */
    protected void closeAllConnections() {
        for (Iterator<Connection> i = connections.iterator(); i.hasNext();) {
            try {
                i.next().close();
            } catch (Exception e) {
            }
        }

        connections.clear();
    }

    /**
     * Handle the --amqurl option.
     * 
     * @param token - current option
     * @param tokens - succeeding list of arguments
     * @throws Exception
     */
    protected void handleOption(String token, List tokens) throws Exception {
        // Try to handle the options first
        if (token.equals("--amqurl")) {
            // If no broker url specified, or next token is a new option
            if (tokens.isEmpty() || ((String)tokens.get(0)).startsWith("-")) {
                context.printException(new IllegalArgumentException("Broker URL not specified."));
                tokens.clear();
                return;
            }

            // If broker url already specified
            if (getBrokerUrl() != null) {
                context
                    .printException(new IllegalArgumentException("Multiple broker URL cannot be specified."));
                tokens.clear();
                return;
            }

            String strBrokerUrl = (String)tokens.remove(0);

            try {
                setBrokerUrl(new URI(strBrokerUrl));
            } catch (URISyntaxException e) {
                context.printException(e);
                tokens.clear();
                return;
            }
        } else {
            // Let the super class handle the option
            super.handleOption(token, tokens);
        }
    }

    /**
     * Set the broker url.
     * 
     * @param brokerUrl - new broker url
     */
    protected void setBrokerUrl(URI brokerUrl) {
        this.brokerUrl = brokerUrl;
    }

    /**
     * Set the broker url.
     * 
     * @param address - address of the new broker url
     * @throws URISyntaxException
     */
    protected void setBrokerUrl(String address) throws URISyntaxException {
        this.brokerUrl = new URI(address);
    }

    /**
     * Get the current broker url.
     * 
     * @return current broker url
     */
    protected URI getBrokerUrl() {
        return brokerUrl;
    }
}