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The Apache Commons Object Pooling Library.
There is a newer version: 2.12.0
/*
 * 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.commons.pool2.proxy;

import java.util.NoSuchElementException;

import org.apache.commons.pool2.KeyedObjectPool;
import org.apache.commons.pool2.UsageTracking;

/**
 * Create a new keyed object pool where the pooled objects are wrapped in
 * proxies allowing better control of pooled objects and in particular the
 * prevention of the continued use of an object by a client after that client
 * returns the object to the pool.
 *
 * @param  type of the key
 * @param  type of the pooled object
 *
 * @since 2.0
 */
public class ProxiedKeyedObjectPool implements KeyedObjectPool {

    private final KeyedObjectPool pool;
    private final ProxySource proxySource;


    /**
     * Create a new proxied object pool.
     *
     * @param pool  The object pool to wrap
     * @param proxySource The source of the proxy objects
     */
    public ProxiedKeyedObjectPool(final KeyedObjectPool pool,
            final ProxySource proxySource) {
        this.pool = pool;
        this.proxySource = proxySource;
    }


    @SuppressWarnings("unchecked")
    @Override
    public V borrowObject(final K key) throws Exception, NoSuchElementException,
            IllegalStateException {
        UsageTracking usageTracking = null;
        if (pool instanceof UsageTracking) {
            usageTracking = (UsageTracking) pool;
        }
        final V pooledObject = pool.borrowObject(key);
        final V proxy = proxySource.createProxy(pooledObject, usageTracking);
        return proxy;
    }

    @Override
    public void returnObject(final K key, final V proxy) throws Exception {
        final V pooledObject = proxySource.resolveProxy(proxy);
        pool.returnObject(key, pooledObject);
    }

    @Override
    public void invalidateObject(final K key, final V proxy) throws Exception {
        final V pooledObject = proxySource.resolveProxy(proxy);
        pool.invalidateObject(key, pooledObject);
    }

    @Override
    public void addObject(final K key) throws Exception, IllegalStateException,
            UnsupportedOperationException {
        pool.addObject(key);
    }

    @Override
    public int getNumIdle(final K key) {
        return pool.getNumIdle(key);
    }

    @Override
    public int getNumActive(final K key) {
        return pool.getNumActive(key);
    }

    @Override
    public int getNumIdle() {
        return pool.getNumIdle();
    }

    @Override
    public int getNumActive() {
        return pool.getNumActive();
    }

    @Override
    public void clear() throws Exception, UnsupportedOperationException {
        pool.clear();
    }

    @Override
    public void clear(final K key) throws Exception, UnsupportedOperationException {
        pool.clear(key);
    }

    @Override
    public void close() {
        pool.close();
    }


    /**
     * @since 2.4.3
     */
    @Override
    public String toString() {
        final StringBuilder builder = new StringBuilder();
        builder.append("ProxiedKeyedObjectPool [pool=");
        builder.append(pool);
        builder.append(", proxySource=");
        builder.append(proxySource);
        builder.append("]");
        return builder.toString();
    }
}