/*
* 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.deltaspike.proxy.util;
import java.io.Serializable;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.util.ArrayList;
import javax.enterprise.inject.spi.BeanManager;
import org.apache.deltaspike.proxy.api.DeltaSpikeProxyFactory;
public class EnableInterceptorsProxyFactory extends DeltaSpikeProxyFactory
{
private static final EnableInterceptorsProxyFactory INSTANCE = new EnableInterceptorsProxyFactory();
private EnableInterceptorsProxyFactory()
{
}
public static <T> T wrap(T obj, BeanManager beanManager)
{
if (obj == null)
{
throw new IllegalArgumentException("obj must not be null!");
}
// generate proxy
Class proxyClass = INSTANCE.getProxyClass(beanManager, obj.getClass());
// delegate method calls to our original instance from the wrapped producer method
EnableInterceptorsDelegate delegate = new EnableInterceptorsDelegate(obj);
try
{
// instantiate proxy
Constructor constructor = proxyClass.getConstructor(InvocationHandler.class);
return (T) constructor.newInstance(delegate);
}
catch (Exception e)
{
throw new RuntimeException("Could not create proxy instance by class " + obj.getClass(), e);
}
}
@Override
protected ArrayList<Method> getDelegateMethods(Class<?> targetClass, ArrayList<Method> allMethods)
{
// the default #filterInterceptMethods filters all non-public, final and abstract methods
// which means actually every publich proxyable method
// as we need to delegate method call to the original object instance -> proxy all public methods
ArrayList<Method> delegateMethods = super.filterInterceptMethods(targetClass, allMethods);
return delegateMethods;
}
@Override
protected ArrayList<Method> filterInterceptMethods(Class<?> targetClass, ArrayList<Method> allMethods)
{
// we don't need to overwrite methods to just execute interceptors
// all method call are delegated to our EnableInterceptorsDelegate, to delegate to the original object instance
return null;
}
@Override
protected String getProxyClassSuffix()
{
return "$$DSInterceptorProxy";
}
/**
* {@link InvocationHandler} to delegate every method call to an provided object instance.
*/
private static class EnableInterceptorsDelegate implements InvocationHandler, Serializable
{
private final Object instance;
public EnableInterceptorsDelegate(Object instance)
{
this.instance = instance;
}
@Override
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable
{
return method.invoke(instance, args);
}
}
}