/*
* Copyright 2002-2007 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.support;
import org.aopalliance.intercept.MethodInvocation;
/**
* Abstract base class for remote service accessors that are based
* on serialization of {@link RemoteInvocation} objects.
*
* Provides a "remoteInvocationFactory" property, with a
* {@link DefaultRemoteInvocationFactory} as default strategy.
*
* @author Juergen Hoeller
* @since 1.1
* @see #setRemoteInvocationFactory
* @see RemoteInvocation
* @see RemoteInvocationFactory
* @see DefaultRemoteInvocationFactory
*/
public abstract class RemoteInvocationBasedAccessor extends UrlBasedRemoteAccessor {
private RemoteInvocationFactory remoteInvocationFactory = new DefaultRemoteInvocationFactory();
/**
* Set the RemoteInvocationFactory to use for this accessor.
* Default is a {@link DefaultRemoteInvocationFactory}.
* <p>A custom invocation factory can add further context information
* to the invocation, for example user credentials.
*/
public void setRemoteInvocationFactory(RemoteInvocationFactory remoteInvocationFactory) {
this.remoteInvocationFactory =
(remoteInvocationFactory != null ? remoteInvocationFactory : new DefaultRemoteInvocationFactory());
}
/**
* Return the RemoteInvocationFactory used by this accessor.
*/
public RemoteInvocationFactory getRemoteInvocationFactory() {
return this.remoteInvocationFactory;
}
/**
* Create a new RemoteInvocation object for the given AOP method invocation.
* <p>The default implementation delegates to the configured
* {@link #setRemoteInvocationFactory RemoteInvocationFactory}.
* This can be overridden in subclasses in order to provide custom RemoteInvocation
* subclasses, containing additional invocation parameters (e.g. user credentials).
* <p>Note that it is preferable to build a custom RemoteInvocationFactory
* as a reusable strategy, instead of overriding this method.
* @param methodInvocation the current AOP method invocation
* @return the RemoteInvocation object
* @see RemoteInvocationFactory#createRemoteInvocation
*/
protected RemoteInvocation createRemoteInvocation(MethodInvocation methodInvocation) {
return getRemoteInvocationFactory().createRemoteInvocation(methodInvocation);
}
/**
* Recreate the invocation result contained in the given RemoteInvocationResult object.
* <p>The default implementation calls the default <code>recreate()</code> method.
* This can be overridden in subclass to provide custom recreation, potentially
* processing the returned result object.
* @param result the RemoteInvocationResult to recreate
* @return a return value if the invocation result is a successful return
* @throws Throwable if the invocation result is an exception
* @see RemoteInvocationResult#recreate()
*/
protected Object recreateRemoteInvocationResult(RemoteInvocationResult result) throws Throwable {
return result.recreate();
}
}