https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
/*
 * Copyright (C) 2011 The Guava Authors
 *
 * Licensed 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.
 */


This package contains caching utilities.

The core interface used to represent caches is Cache. In-memory caches can be configured and created using CacheBuilder, with cache entries being loaded by CacheLoader. Statistics about cache performance are exposed using CacheStats. 
See the Guava User Guide article on caches.

This package is a part of the open-source Guava
library.

Author:Charles Fry
/**
 * This package contains caching utilities.
 *
 * <p>The core interface used to represent caches is {@link com.google.common.cache.Cache}.
 * In-memory caches can be configured and created using {@link
 * com.google.common.cache.CacheBuilder}, with cache entries being loaded by {@link
 * com.google.common.cache.CacheLoader}. Statistics about cache performance are exposed using {@link
 * com.google.common.cache.CacheStats}.
 *
 * <p>See the Guava User Guide article on <a
 * href="https://github.com/google/guava/wiki/CachesExplained">caches</a>.
 *
 * <p>This package is a part of the open-source <a href="http://github.com/google/guava">Guava</a>
 * library.
 *
 * @author Charles Fry
 */
@ParametersAreNonnullByDefault
package com.google.common.cache;

import javax.annotation.ParametersAreNonnullByDefault;