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FreeMarker is a "template engine"; a generic tool to generate text output based on templates.

There is a newer version: 2.3.33

/*
 * 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;

/**
 * Cache storage abstracts away the storage aspects of a cache - associating
 * an object with a key, retrieval and removal via the key. It is actually a
 * small subset of the {@link java.util.Map} interface. 
 * The implementations can be coded in a non-threadsafe manner as the natural
 * user of the cache storage, {@link TemplateCache} does the necessary
 * synchronization.
 *
 * @see freemarker.template.Configuration#setCacheStorage(CacheStorage)
 */
public interface CacheStorage {
    public Object get(Object key);
    public void put(Object key, Object value);
    public void remove(Object key);
    public void clear();
}