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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.impl;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.List;
import java.util.concurrent.Future;
import javax.xml.ws.AsyncHandler;
import javax.xml.ws.Response;
import org.apache.tuscany.sca.common.java.collection.LRUCache;
import org.apache.tuscany.sca.core.LifeCycleListener;
import org.apache.tuscany.sca.core.context.ServiceReferenceExt;
import org.apache.tuscany.sca.core.context.impl.CallbackServiceReferenceImpl;
import org.apache.tuscany.sca.core.context.impl.ServiceReferenceImpl;
import org.apache.tuscany.sca.core.invocation.ProxyCreationException;
import org.apache.tuscany.sca.core.invocation.ProxyFactory;
import org.apache.tuscany.sca.interfacedef.InterfaceContractMapper;
import org.apache.tuscany.sca.invocation.MessageFactory;
import org.apache.tuscany.sca.runtime.Invocable;
import org.oasisopen.sca.ServiceReference;
/**
* the default implementation of a wire service that uses JDK dynamic proxies
*
* @version $Rev$ $Date$
*/
public class JDKProxyFactory implements ProxyFactory, LifeCycleListener {
protected InterfaceContractMapper contractMapper;
private MessageFactory messageFactory;
public JDKProxyFactory(MessageFactory messageFactory, InterfaceContractMapper mapper) {
this.contractMapper = mapper;
this.messageFactory = messageFactory;
}
/**
* The original createProxy method assumes that the proxy doesn't want to
* share conversation state so sets the conversation object to null
*/
public <T> T createProxy(Class<T> interfaze, Invocable wire) throws ProxyCreationException {
ServiceReference<T> serviceReference = new ServiceReferenceImpl<T>(interfaze, wire, null);
return createProxy(serviceReference);
}
public <T> T createProxy(ServiceReference<T> callableReference) throws ProxyCreationException {
assert callableReference != null;
final Class<T> interfaze = callableReference.getBusinessInterface();
InvocationHandler handler;
if (isAsync(interfaze)) {
handler = new AsyncJDKInvocationHandler(messageFactory, callableReference);
} else {
handler = new JDKInvocationHandler(messageFactory, callableReference);
}
// Allow privileged access to class loader. Requires RuntimePermission in security policy.
ClassLoader cl = AccessController.doPrivileged(new PrivilegedAction<ClassLoader>() {
public ClassLoader run() {
return interfaze.getClassLoader();
}
});
T proxy = interfaze.cast(newProxyInstance(cl, new Class[] {interfaze}, handler));
((ServiceReferenceExt<T>)callableReference).setProxy(proxy);
return proxy;
}
private boolean isAsync(Class<?> interfaze) {
for (Method method : interfaze.getMethods()) {
if (method.getName().endsWith("Async")) {
if (method.getReturnType().isAssignableFrom(Future.class)) {
if (method.getParameterTypes().length > 0) {
if (method.getParameterTypes()[method.getParameterTypes().length-1].isAssignableFrom(AsyncHandler.class)) {
return true;
}
}
}
if (method.getReturnType().isAssignableFrom(Response.class)) {
return true;
}
}
}
return false;
}
public <T> T createCallbackProxy(Class<T> interfaze, List<? extends Invocable> wires) throws ProxyCreationException {
ServiceReferenceImpl<T> callbackReference = new CallbackServiceReferenceImpl(interfaze, wires);
return callbackReference != null ? createCallbackProxy(callbackReference) : null;
}
public <T> T createCallbackProxy(ServiceReference<T> callbackReference) throws ProxyCreationException {
assert callbackReference != null;
Class<T> interfaze = callbackReference.getBusinessInterface();
InvocationHandler handler = new JDKCallbackInvocationHandler(messageFactory, callbackReference);
ClassLoader cl = interfaze.getClassLoader();
T proxy = interfaze.cast(newProxyInstance(cl, new Class[] {interfaze}, handler));
((ServiceReferenceExt<T>) callbackReference).setProxy(proxy);
return proxy;
}
public <B, R extends ServiceReference<B>> R cast(B target) throws IllegalArgumentException {
InvocationHandler handler = Proxy.getInvocationHandler(target);
if (handler instanceof JDKInvocationHandler) {
return (R)((JDKInvocationHandler)handler).getCallableReference();
} else {
throw new IllegalArgumentException("The object is not a known proxy.");
}
}
/**
* @see org.apache.tuscany.sca.core.invocation.ProxyFactory#isProxyClass(java.lang.Class)
*/
public boolean isProxyClass(Class<?> clazz) {
return Proxy.isProxyClass(clazz);
}
// 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 LRUCache<Class<?>, Constructor<?>> cache = new LRUCache<Class<?>, Constructor<?>>(512);
public Object newProxyInstance(ClassLoader classloader,
Class<?> interfaces[],
InvocationHandler invocationhandler) throws IllegalArgumentException {
if (interfaces.length > 1) {
// We only cache the proxy constructors with one single interface which the case in SCA where
// one reference can have one interface
return Proxy.newProxyInstance(classloader, interfaces, invocationhandler);
}
try {
if (invocationhandler == null)
throw new NullPointerException("InvocationHandler is null");
// Lookup cached constructor. aclass[0] is the reference's business interface.
Constructor<?> proxyCTOR;
synchronized (cache) {
proxyCTOR = cache.get(interfaces[0]);
}
if (proxyCTOR == null) {
Class<?> proxyClass = Proxy.getProxyClass(classloader, interfaces);
proxyCTOR = proxyClass.getConstructor(InvocationHandler.class);
synchronized (cache) {
cache.put(interfaces[0], proxyCTOR);
}
}
return proxyCTOR.newInstance(invocationhandler);
} catch (Throwable e) {
throw new IllegalArgumentException(e);
}
}
public void start() {
}
public void stop() {
cache.clear();
}
}
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