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/*
* 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.tuscany.sca.core.invocation;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Proxy;
import java.util.WeakHashMap;
public class CachedProxy extends Proxy {
private static final long serialVersionUID = 783519311852563060L;
protected CachedProxy(InvocationHandler handler) {
super(handler);
}
// This is a cache containing the proxy class constructor for each business interface.
// This improves performance compared to calling Proxy.newProxyInstance()
// every time that a proxy is needed.
private final static WeakHashMap<Class<?>, Constructor<?>> cache = new WeakHashMap<Class<?>, Constructor<?>>();
public static Object newProxyInstance(ClassLoader classloader, Class<?> aclass[], InvocationHandler invocationhandler)
throws IllegalArgumentException {
try {
if (invocationhandler == null)
throw new NullPointerException();
// Lookup cached constructor. aclass[0] is the reference's business interface.
Constructor<?> proxyCTOR;
synchronized (cache) {
proxyCTOR = cache.get(aclass[0]);
}
if (proxyCTOR == null) {
Class<?> proxyClass = getProxyClass(classloader, aclass);
proxyCTOR = proxyClass.getConstructor(constructorParams);
synchronized (cache) {
cache.put(aclass[0], proxyCTOR);
}
}
return proxyCTOR.newInstance(new Object[] {invocationhandler});
} catch (NoSuchMethodException e) {
throw new InternalError(e.toString());
} catch (IllegalAccessException e) {
throw new InternalError(e.toString());
} catch (InstantiationException e) {
throw new InternalError(e.toString());
} catch (InvocationTargetException e) {
throw new InternalError(e.toString());
}
}
private static final Class<?> constructorParams[] = {InvocationHandler.class};
}
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