| /* |
| * 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.ignite.internal.processors.cache; |
| |
| import java.io.Externalizable; |
| import java.io.IOException; |
| import java.io.ObjectInput; |
| import java.io.ObjectOutput; |
| import org.apache.ignite.cache.eviction.EvictableEntry; |
| import org.apache.ignite.cache.eviction.EvictionPolicy; |
| |
| /** |
| * Cache eviction policy that expires every entry essentially keeping the cache empty. |
| * This eviction policy can be used whenever one cache is used to front another |
| * and its size should be kept at {@code 0}. |
| */ |
| public class GridCacheAlwaysEvictionPolicy<K, V> implements EvictionPolicy<K, V>, Externalizable { |
| /** {@inheritDoc} */ |
| @Override public void onEntryAccessed(boolean rmv, EvictableEntry<K, V> entry) { |
| if (!rmv && entry.isCached()) |
| entry.evict(); |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void writeExternal(ObjectOutput out) throws IOException { |
| // No-op. |
| } |
| |
| /** {@inheritDoc} */ |
| @Override public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException { |
| // No-op. |
| } |
| } |