/*

  * This software is licensed under the Apache License, Version 2.0

  * (the "License") agreement; 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 net.admin4j.util;

 import java.util.ArrayList;

 /**

  * Daemon cleaning up expired entries in registered ExpiringCache objects.

  * 

  * @author D. Ashmore

  *

  * 

  */

 class ExpiringCacheCleanupTask implements Runnable

 {

     private ArrayList<ExpiringCache> expiringCacheList = new ArrayList<ExpiringCache>();

     /**

      * Registers cache for periodic cleanup. 

      * @param cache

      */

     protected void registerCache(ExpiringCache cache)

     {

         if (cache == null)  throw new IllegalArgumentException("Null cache not allowed.");

         synchronized (this.expiringCacheList)

         {

             this.expiringCacheList.add(cache);

         }

     }

     /* (non-Javadoc)

      * @see java.lang.Runnable#run()

      */

     public void run()

     {

         ExpiringCache cache;

         synchronized (this.expiringCacheList)

         {

             for (int i = 0; i < this.expiringCacheList.size(); i++)

             {

                 cache = (ExpiringCache) this.expiringCacheList.get(i);

                 cache.purgeExpiredContent();

             }

         }

     }

     /**

      * Clears all entries in all caches.  This is needed for admin and testing use.

      *

      */

     public void clearAllCacheContent()

     {

         ExpiringCache cache;

         synchronized (this.expiringCacheList)

         {

             for (int i = 0; i < this.expiringCacheList.size(); i++)

             {

                 cache = (ExpiringCache) this.expiringCacheList.get(i);

                 cache.clear();

             }

         }

     }

 }