1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17 package org.apache.commons.pool2.proxy;
18
19 import java.lang.reflect.Proxy;
20 import java.util.Arrays;
21
22 import org.apache.commons.pool2.UsageTracking;
23
24 /**
25 * Provides proxy objects using Java reflection.
26 *
27 * @param <T> type of the pooled object to be proxied
28 *
29 * @since 2.0
30 */
31 public class JdkProxySource<T> implements ProxySource<T> {
32
33 private final ClassLoader classLoader;
34 private final Class<?>[] interfaces;
35
36 /**
37 * Constructs a new proxy source for the given interfaces.
38 *
39 * @param classLoader The class loader with which to create the proxy
40 * @param interfaces The interfaces to proxy
41 */
42 public JdkProxySource(final ClassLoader classLoader, final Class<?>[] interfaces) {
43 this.classLoader = classLoader;
44 // Defensive copy
45 this.interfaces = Arrays.copyOf(interfaces, interfaces.length);
46 }
47
48 @SuppressWarnings("unchecked") // Cast to T on return.
49 @Override
50 public T createProxy(final T pooledObject, final UsageTracking<T> usageTracking) {
51 return (T) Proxy.newProxyInstance(classLoader, interfaces,
52 new JdkProxyHandler<>(pooledObject, usageTracking));
53 }
54
55 @SuppressWarnings("unchecked")
56 @Override
57 public T resolveProxy(final T proxy) {
58 return ((JdkProxyHandler<T>) Proxy.getInvocationHandler(proxy)).disableProxy();
59 }
60
61 /**
62 * @since 2.4.3
63 */
64 @Override
65 public String toString() {
66 final StringBuilder builder = new StringBuilder();
67 builder.append("JdkProxySource [classLoader=");
68 builder.append(classLoader);
69 builder.append(", interfaces=");
70 builder.append(Arrays.toString(interfaces));
71 builder.append("]");
72 return builder.toString();
73 }
74 }