/*
* Copyright 2002-2008 the original author or authors.
*
* 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.springframework.remoting.rmi;
import java.lang.reflect.InvocationTargetException;
import java.rmi.Remote;
import org.springframework.remoting.support.RemoteInvocation;
import org.springframework.remoting.support.RemoteInvocationBasedExporter;
/**
* Convenient superclass for RMI-based remote exporters. Provides a facility
* to automatically wrap a given plain Java service object with an
* RmiInvocationWrapper, exposing the {@link RmiInvocationHandler} remote interface.
*
* <p>Using the RMI invoker mechanism, RMI communication operates at the {@link RmiInvocationHandler}
* level, sharing a common invoker stub for any number of services. Service interfaces are <i>not</i>
* required to extend <code>java.rmi.Remote</code> or declare <code>java.rmi.RemoteException</code>
* on all service methods. However, in and out parameters still have to be serializable.
*
* @author Juergen Hoeller
* @since 1.2.5
* @see RmiServiceExporter
* @see JndiRmiServiceExporter
*/
public abstract class RmiBasedExporter extends RemoteInvocationBasedExporter {
/**
* Determine the object to export: either the service object itself
* or a RmiInvocationWrapper in case of a non-RMI service object.
* @return the RMI object to export
* @see #setService
* @see #setServiceInterface
*/
protected Remote getObjectToExport() {
// determine remote object
if (getService() instanceof Remote &&
(getServiceInterface() == null || Remote.class.isAssignableFrom(getServiceInterface()))) {
// conventional RMI service
return (Remote) getService();
}
else {
// RMI invoker
if (logger.isDebugEnabled()) {
logger.debug("RMI service [" + getService() + "] is an RMI invoker");
}
return new RmiInvocationWrapper(getProxyForService(), this);
}
}
/**
* Redefined here to be visible to RmiInvocationWrapper.
* Simply delegates to the corresponding superclass method.
*/
protected Object invoke(RemoteInvocation invocation, Object targetObject)
throws NoSuchMethodException, IllegalAccessException, InvocationTargetException {
return super.invoke(invocation, targetObject);
}
}