org.apache.commons.pool2.proxy.JdkProxySource Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.pool2.proxy;
import java.lang.reflect.Proxy;
import java.util.Arrays;
import org.apache.commons.pool2.UsageTracking;
/**
* Provides proxy objects using Java reflection.
*
* @param type of the pooled object to be proxied
*
* @since 2.0
*/
public class JdkProxySource implements ProxySource {
private final ClassLoader classLoader;
private final Class[] interfaces;
/**
* Create a new proxy source for the given interfaces.
*
* @param classLoader The class loader with which to create the proxy
* @param interfaces The interfaces to proxy
*/
public JdkProxySource(final ClassLoader classLoader, final Class[] interfaces) {
this.classLoader = classLoader;
// Defensive copy
this.interfaces = new Class[interfaces.length];
System.arraycopy(interfaces, 0, this.interfaces, 0, interfaces.length);
}
@Override
public T createProxy(final T pooledObject, final UsageTracking usageTracking) {
@SuppressWarnings("unchecked")
final
T proxy = (T) Proxy.newProxyInstance(classLoader, interfaces,
new JdkProxyHandler<>(pooledObject, usageTracking));
return proxy;
}
@Override
public T resolveProxy(final T proxy) {
@SuppressWarnings("unchecked")
final
JdkProxyHandler jdkProxyHandler =
(JdkProxyHandler) Proxy.getInvocationHandler(proxy);
final T pooledObject = jdkProxyHandler.disableProxy();
return pooledObject;
}
/**
* @since 2.4.3
*/
@Override
public String toString() {
final StringBuilder builder = new StringBuilder();
builder.append("JdkProxySource [classLoader=");
builder.append(classLoader);
builder.append(", interfaces=");
builder.append(Arrays.toString(interfaces));
builder.append("]");
return builder.toString();
}
}