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ActiveMQ example source code file (ActiveMQInitialContextFactory.java)

This example ActiveMQ source code file (ActiveMQInitialContextFactory.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, activemqconnectionfactory, activemqqueue, hashtable, hashtable, iterator, lazycreatecontext, naming, namingexception, net, network, object, object, properties, readonlycontext, string, string, threading, threads, util

The ActiveMQ ActiveMQInitialContextFactory.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.jndi;

import java.net.URISyntaxException;
import java.util.ArrayList;
import java.util.Hashtable;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.StringTokenizer;
import java.util.concurrent.ConcurrentHashMap;

import javax.jms.Queue;
import javax.jms.Topic;
import javax.naming.Context;
import javax.naming.NamingException;
import javax.naming.spi.InitialContextFactory;

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

/**
 * A factory of the ActiveMQ InitialContext which contains
 * {@link ConnectionFactory} instances as well as a child context called
 * <i>destinations which contain all of the current active destinations, in
 * child context depending on the QoS such as transient or durable and queue or
 * topic.
 * 
 * 
 */
public class ActiveMQInitialContextFactory implements InitialContextFactory {

    private static final String[] DEFAULT_CONNECTION_FACTORY_NAMES = {"ConnectionFactory", "QueueConnectionFactory", "TopicConnectionFactory"};

    private String connectionPrefix = "connection.";
    private String queuePrefix = "queue.";
    private String topicPrefix = "topic.";

    public Context getInitialContext(Hashtable environment) throws NamingException {
        // lets create a factory
        Map<String, Object> data = new ConcurrentHashMap();
        String[] names = getConnectionFactoryNames(environment);
        for (int i = 0; i < names.length; i++) {
            ActiveMQConnectionFactory factory = null;
            String name = names[i];

            try {
                factory = createConnectionFactory(name, environment);
            } catch (Exception e) {
                throw new NamingException("Invalid broker URL");

            }
            /*
             * if( broker==null ) { try { broker = factory.getEmbeddedBroker(); }
             * catch (JMSException e) { log.warn("Failed to get embedded
             * broker", e); } }
             */
            data.put(name, factory);
        }

        createQueues(data, environment);
        createTopics(data, environment);
        /*
         * if (broker != null) { data.put("destinations",
         * broker.getDestinationContext(environment)); }
         */
        data.put("dynamicQueues", new LazyCreateContext() {
            private static final long serialVersionUID = 6503881346214855588L;

            protected Object createEntry(String name) {
                return new ActiveMQQueue(name);
            }
        });
        data.put("dynamicTopics", new LazyCreateContext() {
            private static final long serialVersionUID = 2019166796234979615L;

            protected Object createEntry(String name) {
                return new ActiveMQTopic(name);
            }
        });

        return createContext(environment, data);
    }

    // Properties
    // -------------------------------------------------------------------------
    public String getTopicPrefix() {
        return topicPrefix;
    }

    public void setTopicPrefix(String topicPrefix) {
        this.topicPrefix = topicPrefix;
    }

    public String getQueuePrefix() {
        return queuePrefix;
    }

    public void setQueuePrefix(String queuePrefix) {
        this.queuePrefix = queuePrefix;
    }

    // Implementation methods
    // -------------------------------------------------------------------------

    protected ReadOnlyContext createContext(Hashtable environment, Map<String, Object> data) {
        return new ReadOnlyContext(environment, data);
    }

    protected ActiveMQConnectionFactory createConnectionFactory(String name, Hashtable environment) throws URISyntaxException {
        Hashtable temp = new Hashtable(environment);
        String prefix = connectionPrefix + name + ".";
        for (Iterator iter = environment.entrySet().iterator(); iter.hasNext();) {
            Map.Entry entry = (Map.Entry)iter.next();
            String key = (String)entry.getKey();
            if (key.startsWith(prefix)) {
                // Rename the key...
                temp.remove(key);
                key = key.substring(prefix.length());
                temp.put(key, entry.getValue());
            }
        }
        return createConnectionFactory(temp);
    }

    protected String[] getConnectionFactoryNames(Map environment) {
        String factoryNames = (String)environment.get("connectionFactoryNames");
        if (factoryNames != null) {
            List<String> list = new ArrayList();
            for (StringTokenizer enumeration = new StringTokenizer(factoryNames, ","); enumeration.hasMoreTokens();) {
                list.add(enumeration.nextToken().trim());
            }
            int size = list.size();
            if (size > 0) {
                String[] answer = new String[size];
                list.toArray(answer);
                return answer;
            }
        }
        return DEFAULT_CONNECTION_FACTORY_NAMES;
    }

    protected void createQueues(Map<String, Object> data, Hashtable environment) {
        for (Iterator iter = environment.entrySet().iterator(); iter.hasNext();) {
            Map.Entry entry = (Map.Entry)iter.next();
            String key = entry.getKey().toString();
            if (key.startsWith(queuePrefix)) {
                String jndiName = key.substring(queuePrefix.length());
                data.put(jndiName, createQueue(entry.getValue().toString()));
            }
        }
    }

    protected void createTopics(Map<String, Object> data, Hashtable environment) {
        for (Iterator iter = environment.entrySet().iterator(); iter.hasNext();) {
            Map.Entry entry = (Map.Entry)iter.next();
            String key = entry.getKey().toString();
            if (key.startsWith(topicPrefix)) {
                String jndiName = key.substring(topicPrefix.length());
                data.put(jndiName, createTopic(entry.getValue().toString()));
            }
        }
    }

    /**
     * Factory method to create new Queue instances
     */
    protected Queue createQueue(String name) {
        return new ActiveMQQueue(name);
    }

    /**
     * Factory method to create new Topic instances
     */
    protected Topic createTopic(String name) {
        return new ActiveMQTopic(name);
    }

    /**
     * Factory method to create a new connection factory from the given
     * environment
     */
    protected ActiveMQConnectionFactory createConnectionFactory(Hashtable environment) throws URISyntaxException {
        ActiveMQConnectionFactory answer = needsXA(environment) ? new ActiveMQXAConnectionFactory() : new ActiveMQConnectionFactory();
        Properties properties = new Properties();
        properties.putAll(environment);
        answer.setProperties(properties);
        return answer;
    }

    private boolean needsXA(Hashtable environment) {
        boolean isXA = Boolean.parseBoolean((String) environment.get("xa"));
        // property not applicable to connectionfactory so remove
        environment.remove("xa");
        return isXA;
    }

    public String getConnectionPrefix() {
        return connectionPrefix;
    }

    public void setConnectionPrefix(String connectionPrefix) {
        this.connectionPrefix = connectionPrefix;
    }

}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ ActiveMQInitialContextFactory.java source code file:

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