/*
    * 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.commons.jcs.jcache;
  
  import java.util.Arrays;
  import java.util.Map;
  
  import javax.cache.Cache;
  import javax.cache.configuration.CacheEntryListenerConfiguration;
  import javax.cache.event.CacheEntryEvent;
  import javax.cache.event.EventType;
  
  import org.apache.commons.jcs.engine.behavior.ICacheElement;
  import org.apache.commons.jcs.engine.behavior.ICompositeCacheAttributes;
  import org.apache.commons.jcs.engine.behavior.IElementAttributes;
  import org.apache.commons.jcs.engine.control.CompositeCache;
  
  // allows us to plug some lifecycle callbacks on the core cache without impacting too much the core
  public class ExpiryAwareCache<A, B> extends CompositeCache<A, B>
  {
      private Map<CacheEntryListenerConfiguration<A, B>, JCSListener<A, B>> listeners;
      private Cache<A, B> cacheRef;
  
      ExpiryAwareCache(final ICompositeCacheAttributes cattr, final IElementAttributes attr)
      {
          super(cattr, attr);
      }
  
      @Override
      protected void doExpires(final ICacheElement<A, B> element)
      {
          super.doExpires(element);
          for (final JCSListener<A, B> listener : listeners.values())
          {
              listener.onExpired(Arrays.<CacheEntryEvent<? extends A, ? extends B>> asList(new JCSCacheEntryEvent<A, B>(
                      cacheRef, EventType.REMOVED, null, element.getKey(), element.getVal())));
          }
      }
  
      void init(final Cache<A, B> cache, final Map<CacheEntryListenerConfiguration<A, B>, JCSListener<A, B>> listeners)
      {
          this.cacheRef = cache;
          this.listeners = listeners;
      }
  }