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 * Constructs 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 @SuppressWarnings("unchecked") // Cast to T on return. 052 @Override 053 public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) { 054 return (T) Proxy.newProxyInstance(classLoader, interfaces, 055 new JdkProxyHandler<>(pooledObject, usageTracking)); 056 } 057 058 059 @SuppressWarnings("unchecked") 060 @Override 061 public T resolveProxy(final T proxy) { 062 return ((JdkProxyHandler<T>) Proxy.getInvocationHandler(proxy)).disableProxy(); 063 } 064 065 066 /** 067 * @since 2.4.3 068 */ 069 @Override 070 public String toString() { 071 final StringBuilder builder = new StringBuilder(); 072 builder.append("JdkProxySource [classLoader="); 073 builder.append(classLoader); 074 builder.append(", interfaces="); 075 builder.append(Arrays.toString(interfaces)); 076 builder.append("]"); 077 return builder.toString(); 078 } 079}