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    1   package org.apache.turbine.services;
    2
    3
    4   /*
    5    * Licensed to the Apache Software Foundation (ASF) under one
    6    * or more contributor license agreements.  See the NOTICE file
    7    * distributed with this work for additional information
    8    * regarding copyright ownership.  The ASF licenses this file
    9    * to you under the Apache License, Version 2.0 (the
    10   * "License"); you may not use this file except in compliance
    11   * with the License.  You may obtain a copy of the License at
    12   *
    13   *   http://www.apache.org/licenses/LICENSE-2.0
    14   *
    15   * Unless required by applicable law or agreed to in writing,
    16   * software distributed under the License is distributed on an
    17   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
    18   * KIND, either express or implied.  See the License for the
    19   * specific language governing permissions and limitations
    20   * under the License.
    21   */
    22
    23
    24  /**
    25   * This is a singleton utility class that acts as a Services broker.
    26   *
    27   * @author <a href="mailto:greg@shwoop.com">Greg Ritter</a>
    28   * @author <a href="mailto:bmclaugh@algx.net">Brett McLaughlin</a>
    29   * @author <a href="mailto:burton@apache.org">Kevin Burton</a>
    30   * @author <a href="mailto:krzewski@e-point.pl">Rafal Krzewski</a>
    31   * @author <a href="mailto:jon@latchkey.com">Jon S. Stevens</a>
    32   * @author <a href="mailto:jvanzyl@apache.org">Jason van Zyl</a>
    33   * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
    34   * @version $Id: TurbineServices.java 615328 2008-01-25 20:25:05Z tv $
    35   */
    36  public class TurbineServices
    37          extends BaseServiceBroker
    38          implements ServiceManager
    39  {
    40      /** The single instance of this class. */
    41      private static ServiceManager instance = new TurbineServices();
    42
    43      /**
    44       * This constructor is protected to force clients to use
    45       * getInstance() to access this class.
    46       */
    47      protected TurbineServices()
    48      {
    49          super();
    50      }
    51
    52      /**
    53       * The method through which this class is accessed as a broker.
    54       *
    55       * @return The single instance of this class.
    56       */
    57      public static ServiceManager getInstance()
    58      {
    59          return instance;
    60      }
    61
    62      /**
    63       * The method through which to change the default manager.
    64       * Note that services of the previous manager will be shutdown.
    65       * @param manager a new service manager.
    66       */
    67      public static synchronized void setManager(ServiceManager manager)
    68      {
    69          ServiceManager previous = instance;
    70          instance = manager;
    71          if (previous != null)
    72          {
    73              previous.shutdownServices();
    74          }
    75      }
    76  }