https://github.com/Microsoft/mssql-jdbc: Microsoft JDBC Driver for SQL Server. (Microsoft Corporation) 
/*
 * Copyright 2011 Google Inc. All Rights Reserved.
 *
 * 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 an implementation of a bounded ConcurrentMap data structure. 
 Weigher is a simple interface for determining how many units of capacity an entry consumes. Depending on which concrete Weigher class is used, an entry may consume a different amount of space within the cache. The Weighers class provides utility methods for obtaining the most common kinds of implementations. 
 EvictionListener provides the ability to be notified when an entry is evicted from the map. An eviction occurs when the entry was automatically removed due to the map exceeding a capacity threshold. It is not called when an entry was explicitly removed. 
 The ConcurrentLinkedHashMap class supplies an efficient, scalable, thread-safe, bounded map. As with the Java Collections Framework the "Concurrent" prefix is used to indicate that the map is not governed by a single exclusion lock.

See Also:
/**
 * This package contains an implementation of a bounded {@link java.util.concurrent.ConcurrentMap} data structure.
 * <p>
 * {@link Weigher} is a simple interface for determining how many units of capacity an entry consumes. Depending on which concrete Weigher class is
 * used, an entry may consume a different amount of space within the cache. The {@link Weighers} class provides utility methods for obtaining the most
 * common kinds of implementations.
 * <p>
 * {@link EvictionListener} provides the ability to be notified when an entry is evicted from the map. An eviction occurs when the entry was
 * automatically removed due to the map exceeding a capacity threshold. It is not called when an entry was explicitly removed.
 * <p>
 * The {@link ConcurrentLinkedHashMap} class supplies an efficient, scalable, thread-safe, bounded map. As with the
 * <code>Java Collections Framework</code> the "Concurrent" prefix is used to indicate that the map is not governed by a single exclusion lock.
 *
 * @see <a href="http://code.google.com/p/concurrentlinkedhashmap/"> http://code.google.com/p/concurrentlinkedhashmap/</a>
 */
package mssql.googlecode.concurrentlinkedhashmap;