| /* |
| * 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 freemarker.cache; |
| |
| import java.util.Map; |
| import java.util.concurrent.ConcurrentHashMap; |
| |
| /** |
| * Strong cache storage is a cache storage that simply wraps a {@link Map}. It holds a strong reference to all objects |
| * it was passed, therefore prevents the cache from being purged during garbage collection. This class is always |
| * thread-safe since 2.3.24, before that if we are running on Java 5 or later. |
| * |
| * @see freemarker.template.Configuration#setCacheStorage(CacheStorage) |
| */ |
| public class StrongCacheStorage implements ConcurrentCacheStorage, CacheStorageWithGetSize { |
| |
| private final Map map = new ConcurrentHashMap(); |
| |
| /** |
| * Always returns {@code true}. |
| */ |
| public boolean isConcurrent() { |
| return true; |
| } |
| |
| public Object get(Object key) { |
| return map.get(key); |
| } |
| |
| public void put(Object key, Object value) { |
| map.put(key, value); |
| } |
| |
| public void remove(Object key) { |
| map.remove(key); |
| } |
| |
| /** |
| * Returns a close approximation of the number of cache entries. |
| * |
| * @since 2.3.21 |
| */ |
| public int getSize() { |
| return map.size(); |
| } |
| |
| public void clear() { |
| map.clear(); |
| } |
| } |