/*

  * 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.myfaces.config.annotation;

 import org.apache.commons.discovery.tools.DiscoverSingleton;

 import javax.faces.context.ExternalContext;

 public abstract class LifecycleProviderFactory {

     protected static final String FACTORY_DEFAULT = DefaultLifecycleProviderFactory.class.getName();

     private static volatile LifecycleProviderFactory INSTANCE;

     public static LifecycleProviderFactory getLifecycleProviderFactory()

     {

         LifecycleProviderFactory instance = INSTANCE;

         if (instance != null) {

             return instance;

         }

         return (LifecycleProviderFactory) DiscoverSingleton.find(LifecycleProviderFactory.class, FACTORY_DEFAULT);

     }

     public static void setLifecycleProviderFactory(LifecycleProviderFactory instance) {

         INSTANCE = instance;

     }

     public abstract LifecycleProvider getLifecycleProvider(ExternalContext externalContext);

     public abstract void release();

 }