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Turbine is a servlet based framework that allows experienced Java developers to quickly build secure web applications. Parts of Turbine can also be used independently of the web portion of Turbine as well. In other words, we strive to make portions of Turbine easily available for use in other applications.

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package org.apache.turbine.services;


/*
 * 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.
 */


/**
 * This is a singleton utility class that acts as a Services broker.
 *
 * @author Greg Ritter
 * @author Brett McLaughlin
 * @author Kevin Burton
 * @author Rafal Krzewski
 * @author Jon S. Stevens
 * @author Jason van Zyl
 * @author Henning P. Schmiedehausen
 * @version $Id: TurbineServices.java 615328 2008-01-25 20:25:05Z tv $
 */
public class TurbineServices
        extends BaseServiceBroker
        implements ServiceManager
{
    /** The single instance of this class. */
    private static ServiceManager instance = new TurbineServices();

    /**
     * This constructor is protected to force clients to use
     * getInstance() to access this class.
     */
    protected TurbineServices()
    {
        super();
    }

    /**
     * The method through which this class is accessed as a broker.
     *
     * @return The single instance of this class.
     */
    public static ServiceManager getInstance()
    {
        return instance;
    }

    /**
     * The method through which to change the default manager.
     * Note that services of the previous manager will be shutdown.
     * @param manager a new service manager.
     */
    public static synchronized void setManager(ServiceManager manager)
    {
        ServiceManager previous = instance;
        instance = manager;
        if (previous != null)
        {
            previous.shutdownServices();
        }
    }
}