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 * 029 * @since 2.0 030 */ 031public class JdkProxySource<T> implements ProxySource<T> { 032 033 private final ClassLoader classLoader; 034 private final Class<?>[] interfaces; 035 036 037 /** 038 * Create a new proxy source for the given interfaces. 039 * 040 * @param classLoader The class loader with which to create the proxy 041 * @param interfaces The interfaces to proxy 042 */ 043 public JdkProxySource(final ClassLoader classLoader, final Class<?>[] interfaces) { 044 this.classLoader = classLoader; 045 // Defensive copy 046 this.interfaces = new Class<?>[interfaces.length]; 047 System.arraycopy(interfaces, 0, this.interfaces, 0, interfaces.length); 048 } 049 050 051 @Override 052 public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) { 053 @SuppressWarnings("unchecked") 054 final 055 T proxy = (T) Proxy.newProxyInstance(classLoader, interfaces, 056 new JdkProxyHandler<>(pooledObject, usageTracking)); 057 return proxy; 058 } 059 060 061 @Override 062 public T resolveProxy(final T proxy) { 063 @SuppressWarnings("unchecked") 064 final 065 JdkProxyHandler<T> jdkProxyHandler = 066 (JdkProxyHandler<T>) Proxy.getInvocationHandler(proxy); 067 final T pooledObject = jdkProxyHandler.disableProxy(); 068 return pooledObject; 069 } 070 071 072 /** 073 * @since 2.4.3 074 */ 075 @Override 076 public String toString() { 077 final StringBuilder builder = new StringBuilder(); 078 builder.append("JdkProxySource [classLoader="); 079 builder.append(classLoader); 080 builder.append(", interfaces="); 081 builder.append(Arrays.toString(interfaces)); 082 builder.append("]"); 083 return builder.toString(); 084 } 085}