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}