    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;
    020import java.util.Arrays;
    021
    022import org.apache.commons.pool2.UsageTracking;
    023
    024/**
    025 * Provides proxy objects using Java reflection.
    026 *
    027 * @param <T> type of the pooled object to be proxied
    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     * Constructs a new proxy source for the given interfaces.
    037     *
    038     * @param classLoader The class loader with which to create the proxy
    039     * @param interfaces  The interfaces to proxy
    040     */
    041    public JdkProxySource(final ClassLoader classLoader, final Class<?>[] interfaces) {
    042        this.classLoader = classLoader;
    043        // Defensive copy
    044        this.interfaces = Arrays.copyOf(interfaces, interfaces.length);
    045    }
    046
    047    @SuppressWarnings("unchecked") // Cast to T on return.
    048    @Override
    049    public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) {
    050        return (T) Proxy.newProxyInstance(classLoader, interfaces,
    051                new JdkProxyHandler<>(pooledObject, usageTracking));
    052    }
    053
    054    @SuppressWarnings("unchecked")
    055    @Override
    056    public T resolveProxy(final T proxy) {
    057        return ((JdkProxyHandler<T>) Proxy.getInvocationHandler(proxy)).disableProxy();
    058    }
    059
    060    /**
    061     * @since 2.4.3
    062     */
    063    @Override
    064    public String toString() {
    065        final StringBuilder builder = new StringBuilder();
    066        builder.append("JdkProxySource [classLoader=");
    067        builder.append(classLoader);
    068        builder.append(", interfaces=");
    069        builder.append(Arrays.toString(interfaces));
    070        builder.append("]");
    071        return builder.toString();
    072    }
    073}