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ActiveMQ example source code file (AmqMessagesQueryFilter.java)

This example ActiveMQ source code file (AmqMessagesQueryFilter.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

activemqqueue, amqmessagesqueryfilter, and, connection, connection, destination, destination, exception, iterator, list, list, net, network, string, string, uri, util

The ActiveMQ AmqMessagesQueryFilter.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.filter;

import java.net.URI;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;

import javax.jms.Connection;
import javax.jms.Destination;
import javax.jms.JMSException;
import javax.jms.QueueBrowser;
import javax.jms.Session;

import org.apache.activemq.ActiveMQConnectionFactory;
import org.apache.activemq.command.ActiveMQQueue;
import org.apache.activemq.command.ActiveMQTopic;

public class AmqMessagesQueryFilter extends AbstractQueryFilter {

    private URI brokerUrl;
    private Destination destination;

    /**
     * Create a JMS message query filter
     * 
     * @param brokerUrl - broker url to connect to
     * @param destination - JMS destination to query
     */
    public AmqMessagesQueryFilter(URI brokerUrl, Destination destination) {
        super(null);
        this.brokerUrl = brokerUrl;
        this.destination = destination;
    }

    /**
     * Queries the specified destination using the message selector format query
     * 
     * @param queries - message selector queries
     * @return list messages that matches the selector
     * @throws Exception
     */
    public List query(List queries) throws Exception {
        String selector = "";

        // Convert to message selector
        for (Iterator i = queries.iterator(); i.hasNext();) {
            selector = selector + "(" + i.next().toString() + ") AND ";
        }

        // Remove last AND
        if (!selector.equals("")) {
            selector = selector.substring(0, selector.length() - 5);
        }

        if (destination instanceof ActiveMQQueue) {
            return queryMessages((ActiveMQQueue)destination, selector);
        } else {
            return queryMessages((ActiveMQTopic)destination, selector);
        }
    }

    /**
     * Query the messages of a queue destination using a queue browser
     * 
     * @param queue - queue destination
     * @param selector - message selector
     * @return list of messages that matches the selector
     * @throws Exception
     */
    protected List queryMessages(ActiveMQQueue queue, String selector) throws Exception {
        Connection conn = createConnection(getBrokerUrl());

        Session sess = conn.createSession(false, Session.AUTO_ACKNOWLEDGE);
        QueueBrowser browser = sess.createBrowser(queue, selector);

        List messages = Collections.list(browser.getEnumeration());

        conn.close();

        return messages;
    }

    /**
     * Query the messages of a topic destination using a message consumer
     * 
     * @param topic - topic destination
     * @param selector - message selector
     * @return list of messages that matches the selector
     * @throws Exception
     */
    protected List queryMessages(ActiveMQTopic topic, String selector) throws Exception {
        // TODO: should we use a durable subscriber or a retroactive non-durable
        // subscriber?
        // TODO: if a durable subscriber is used, how do we manage it?
        // subscribe/unsubscribe tasks?
        return null;
    }

    /**
     * Create and start a JMS connection
     * 
     * @param brokerUrl - broker url to connect to.
     * @return JMS connection
     * @throws JMSException
     */
    protected Connection createConnection(URI brokerUrl) throws JMSException {
        Connection conn = (new ActiveMQConnectionFactory(brokerUrl)).createConnection();
        conn.start();
        return conn;
    }

    /**
     * Get the broker url being used.
     * 
     * @return broker url
     */
    public URI getBrokerUrl() {
        return brokerUrl;
    }

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

    /**
     * Get the destination being used.
     * 
     * @return - JMS destination
     */
    public Destination getDestination() {
        return destination;
    }

    /**
     * Set the destination to use.
     * 
     * @param destination - JMS destination
     */
    public void setDestination(Destination destination) {
        this.destination = destination;
    }

}

Other ActiveMQ examples (source code examples)

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