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/*
* JBoss, Home of Professional Open Source
* Copyright 2008, Red Hat, Inc., and individual contributors
* by the @authors tag. See the copyright.txt in the distribution for a
* full listing of individual contributors.
*
* Licensed 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.jboss.weld.bean.proxy;
import java.io.ObjectStreamException;
import java.io.Serializable;
import java.lang.reflect.Method;
import java.util.HashMap;
import java.util.Map;
import java.util.Set;
import org.jboss.weld.annotated.enhanced.MethodSignature;
import org.jboss.weld.annotated.enhanced.jlr.MethodSignatureImpl;
import org.jboss.weld.bean.SessionBean;
import org.jboss.weld.ejb.api.SessionObjectReference;
import org.jboss.weld.logging.BeanLogger;
import org.jboss.weld.logging.SerializationLogger;
import org.jboss.weld.manager.BeanManagerImpl;
import org.jboss.weld.serialization.spi.BeanIdentifier;
import org.jboss.weld.util.collections.ImmutableMap;
import org.jboss.weld.util.reflection.HierarchyDiscovery;
import org.jboss.weld.util.reflection.Reflections;
/**
* Method handler for enterprise bean client proxies
*
* @author Nicklas Karlsson
* @author Pete Muir
* @author Marko Luksa
*/
public class EnterpriseBeanProxyMethodHandler implements MethodHandler, Serializable {
private static final long serialVersionUID = 2107723373882153667L;
private final BeanManagerImpl manager;
private final BeanIdentifier beanId;
private final SessionObjectReference reference;
private final transient SessionBean bean;
private final transient Map, Class> typeToBusinessInterfaceMap;
/**
* Constructor
*
* @param bean the session bean
*/
public EnterpriseBeanProxyMethodHandler(SessionBean bean) {
this(bean, null);
}
/**
* Constructor used directly by {@link #readResolve()}.
*
* @param bean the session bean
* @param reference session object reference or {@code null} to create a new reference
*/
private EnterpriseBeanProxyMethodHandler(SessionBean bean, SessionObjectReference reference) {
this.bean = bean;
this.manager = bean.getBeanManager();
this.beanId = bean.getIdentifier();
Map, Class> typeToBusinessInterfaceMap = new HashMap, Class>();
discoverBusinessInterfaces(typeToBusinessInterfaceMap, bean.getEjbDescriptor().getRemoteBusinessInterfacesAsClasses());
discoverBusinessInterfaces(typeToBusinessInterfaceMap, bean.getEjbDescriptor().getLocalBusinessInterfacesAsClasses());
this.typeToBusinessInterfaceMap = ImmutableMap.copyOf(typeToBusinessInterfaceMap);
if (reference == null) {
this.reference = bean.createReference();
BeanLogger.LOG.createdSessionBeanProxy(bean);
} else {
this.reference = reference;
BeanLogger.LOG.activatedSessionBeanProxy(bean);
}
}
/**
* Looks up the EJB in the container and executes the method on it
*
* @param self the proxy instance.
* @param method the overridden method declared in the super class or
* interface.
* @param proceed the forwarder method for invoking the overridden method. It
* is null if the overridden method is abstract or declared in the
* interface.
* @param args an array of objects containing the values of the arguments
* passed in the method invocation on the proxy instance. If a
* parameter type is a primitive type, the type of the array
* element is a wrapper class.
* @return the resulting value of the method invocation.
* @throws Throwable if the method invocation fails.
*/
@Override
public Object invoke(Object self, Method method, Method proceed, Object[] args) throws Throwable {
if ("destroy".equals(method.getName()) && Marker.isMarker(0, method, args)) {
if (bean.getEjbDescriptor().isStateful()) {
if (!reference.isRemoved()) {
reference.remove();
}
}
return null;
}
if (!bean.isClientCanCallRemoveMethods() && isRemoveMethod(method)) {
throw BeanLogger.LOG.invalidRemoveMethodInvocation(method);
}
Class businessInterface = getBusinessInterface(method);
if (reference.isRemoved() && isToStringMethod(method)) {
return businessInterface.getName() + " [REMOVED]";
}
Object proxiedInstance = reference.getBusinessObject(businessInterface);
Object returnValue = Reflections.invokeAndUnwrap(proxiedInstance, method, args);
BeanLogger.LOG.callProxiedMethod(method, proxiedInstance, args, returnValue);
return returnValue;
}
private boolean isRemoveMethod(Method method) {
// TODO we can certainly optimize this search algorithm!
MethodSignature methodSignature = new MethodSignatureImpl(method);
return bean.getEjbDescriptor().getRemoveMethodSignatures().contains(methodSignature);
}
private boolean isToStringMethod(Method method) {
return "toString".equals(method.getName()) && method.getParameterTypes().length == 0;
}
private Class getBusinessInterface(Method method) {
Class declaringClass = method.getDeclaringClass();
Class businessInterface = null;
if (declaringClass.equals(Object.class)) {
businessInterface = bean.getEjbDescriptor().getObjectInterface();
} else {
// This will likely not work perfectly if there is a session bean with more than one views extending/implementing the declaringClass
businessInterface = typeToBusinessInterfaceMap.get(declaringClass);
}
if (businessInterface == null) {
throw new RuntimeException("Unable to locate a business interface declaring " + method);
}
return businessInterface;
}
@SuppressWarnings("unchecked")
private Object readResolve() throws ObjectStreamException {
try {
return new EnterpriseBeanProxyMethodHandler((SessionBean) manager.getPassivationCapableBean(beanId), reference);
} catch (Exception e) {
throw SerializationLogger.LOG.unableToDeserialize(beanId, e);
}
}
private void discoverBusinessInterfaces(Map, Class> typeToBusinessInterfaceMap, Set> businessInterfaces) {
for (Class businessInterfaceClass : businessInterfaces) {
for (Class type : HierarchyDiscovery.forNormalizedType(businessInterfaceClass).getTypeMap().keySet()) {
typeToBusinessInterfaceMap.put(type, businessInterfaceClass);
}
}
}
}
