    001/*
    002 * Licensed to the Apache Software Foundation (ASF) under one or more
    003 * contributor license agreements.  See the NOTICE file distributed with
    004 * this work for additional information regarding copyright ownership.
    005 * The ASF licenses this file to You under the Apache License, Version 2.0
    006 * (the "License"); you may not use this file except in compliance with
    007 * the License.  You may obtain a copy of the License at
    008 *
    009 *      http://www.apache.org/licenses/LICENSE-2.0
    010 *
    011 * Unless required by applicable law or agreed to in writing, software
    012 * distributed under the License is distributed on an "AS IS" BASIS,
    013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    014 * See the License for the specific language governing permissions and
    015 * limitations under the License.
    016 */
    017package org.apache.commons.pool2.proxy;
    018
    019import java.lang.reflect.Proxy;
    020
    021import org.apache.commons.pool2.UsageTracking;
    022
    023/**
    024 * Provides proxy objects using Java reflection.
    025 *
    026 * @param <T> type of the pooled object to be proxied
    027 *
    028 * @since 2.0
    029 */
    030public class JdkProxySource<T> implements ProxySource<T> {
    031
    032    private final ClassLoader classLoader;
    033    private final Class<?>[] interfaces;
    034
    035
    036    /**
    037     * Create a new proxy source for the given interfaces.
    038     *
    039     * @param classLoader The class loader with which to create the proxy
    040     * @param interfaces  The interfaces to proxy
    041     */
    042    public JdkProxySource(ClassLoader classLoader, Class<?>[] interfaces) {
    043        this.classLoader = classLoader;
    044        // Defensive copy
    045        this.interfaces = new Class<?>[interfaces.length];
    046        System.arraycopy(interfaces, 0, this.interfaces, 0, interfaces.length);
    047    }
    048
    049
    050    @Override
    051    public T createProxy(T pooledObject, UsageTracking<T> usageTracking) {
    052        @SuppressWarnings("unchecked")
    053        T proxy = (T) Proxy.newProxyInstance(classLoader, interfaces,
    054                new JdkProxyHandler<T>(pooledObject, usageTracking));
    055        return proxy;
    056    }
    057
    058
    059    @Override
    060    public T resolveProxy(T proxy) {
    061        @SuppressWarnings("unchecked")
    062        JdkProxyHandler<T> jdkProxyHandler =
    063                (JdkProxyHandler<T>) Proxy.getInvocationHandler(proxy);
    064        T pooledObject = jdkProxyHandler.disableProxy();
    065        return pooledObject;
    066    }
    067}