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The ActiveMQ Message Broker implementation
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/**
 * 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.net.URI;

import org.apache.activemq.util.FactoryFinder;
import org.apache.activemq.util.IOExceptionSupport;

/**
 * A helper class to create a fully configured broker service using a URI. The
 * list of currently supported URI syntaxes is described here
 * 
 * 
 */
public final class BrokerFactory {

    private static final FactoryFinder BROKER_FACTORY_HANDLER_FINDER = new FactoryFinder("META-INF/services/org/apache/activemq/broker/");

    private BrokerFactory() {        
    }
    
    public static BrokerFactoryHandler createBrokerFactoryHandler(String type) throws IOException {
        try {
            return (BrokerFactoryHandler)BROKER_FACTORY_HANDLER_FINDER.newInstance(type);
        } catch (Throwable e) {
            throw IOExceptionSupport.create("Could not load " + type + " factory:" + e, e);
        }
    }

    /**
     * Creates a broker from a URI configuration
     * 
     * @param brokerURI the URI scheme to configure the broker
     * @throws Exception
     */
    public static BrokerService createBroker(URI brokerURI) throws Exception {
        return createBroker(brokerURI, false);
    }

    /**
     * Creates a broker from a URI configuration
     * 
     * @param brokerURI the URI scheme to configure the broker
     * @param startBroker whether or not the broker should have its
     *                {@link BrokerService#start()} method called after
     *                construction
     * @throws Exception
     */
    public static BrokerService createBroker(URI brokerURI, boolean startBroker) throws Exception {
        if (brokerURI.getScheme() == null) {
            throw new IllegalArgumentException("Invalid broker URI, no scheme specified: " + brokerURI);
        }
        BrokerFactoryHandler handler = createBrokerFactoryHandler(brokerURI.getScheme());
        BrokerService broker = handler.createBroker(brokerURI);
        if (startBroker) {
            broker.start();
        }
        return broker;
    }

    /**
     * Creates a broker from a URI configuration
     * 
     * @param brokerURI the URI scheme to configure the broker
     * @throws Exception
     */
    public static BrokerService createBroker(String brokerURI) throws Exception {
        return createBroker(new URI(brokerURI));
    }

    /**
     * Creates a broker from a URI configuration
     * 
     * @param brokerURI the URI scheme to configure the broker
     * @param startBroker whether or not the broker should have its
     *                {@link BrokerService#start()} method called after
     *                construction
     * @throws Exception
     */
    public static BrokerService createBroker(String brokerURI, boolean startBroker) throws Exception {
        return createBroker(new URI(brokerURI), startBroker);
    }

    private static final ThreadLocal START_DEFAULT = new ThreadLocal();

    public static void setStartDefault(boolean startDefault) {
        START_DEFAULT.set(startDefault);
    }
    public static void resetStartDefault() {
        START_DEFAULT.remove();
    }

    public static boolean getStartDefault() {
        Boolean value = START_DEFAULT.get();
        if( value==null ) {
            return true;
        }
        return value;
    }
}