/*
* 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.openejb.util.proxy;
import org.apache.openejb.BeanContext;
import org.apache.openejb.Injection;
import org.apache.openejb.OpenEJBRuntimeException;
import org.apache.openejb.api.Proxy;
import org.apache.xbean.finder.Annotated;
import org.apache.xbean.finder.MetaAnnotatedClass;
import javax.naming.NamingException;
import javax.persistence.EntityManager;
import javax.persistence.PersistenceContext;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
public class DynamicProxyImplFactory {
public static boolean isKnownDynamicallyImplemented(final Class<?> clazz) {
final Annotated<Class<?>> metaClass = new MetaAnnotatedClass(clazz);
return isKnownDynamicallyImplemented(metaClass, clazz);
}
public static boolean isKnownDynamicallyImplemented(final Annotated<?> metaClass, final Class<?> clazz) {
return clazz.isInterface()
&& (metaClass.getAnnotation(PersistenceContext.class) != null
|| metaClass.getAnnotation(Proxy.class) != null);
}
public static Object newProxy(final BeanContext context, final InvocationHandler invocationHandler) {
if (QueryProxy.class.isInstance(invocationHandler)) {
EntityManager em = null;
for (final Injection injection : context.getInjections()) {
if (QueryProxy.class.equals(injection.getTarget())) {
try {
em = (EntityManager) context.getJndiEnc().lookup(injection.getJndiName());
} catch (final NamingException e) {
throw new OpenEJBRuntimeException("a dynamic bean should reference at least one correct PersistenceContext", e);
}
}
}
if (em == null) {
throw new OpenEJBRuntimeException("can't find the entity manager to use for the dynamic bean " + context.getEjbName());
}
QueryProxy.class.cast(invocationHandler).setEntityManager(em);
}
try {
return ProxyManager.newProxyInstance(context.getBeanClass(), new Handler(invocationHandler));
} catch (final IllegalAccessException e) {
throw new OpenEJBRuntimeException("illegal access", e);
}
}
public static Object realHandler(final Object proxy) {
if (proxy != null && java.lang.reflect.Proxy.isProxyClass(proxy.getClass())) {
final Object handler = java.lang.reflect.Proxy.getInvocationHandler(proxy);
if (handler instanceof Handler) {
return ((Handler) handler).realHandler();
}
}
return null;
}
private static final class Handler implements InvocationHandler {
private InvocationHandler handler;
private Handler(final InvocationHandler handler) {
this.handler = handler;
}
public InvocationHandler realHandler() {
return handler;
}
@Override
public Object invoke(final Object proxy, final Method method, final Object[] args) throws Throwable {
return handler.invoke(proxy, method, args);
}
}
}