org.kuali.student.common.spring.SerializableProxyInvokationHandler Maven / Gradle / Ivy
/*
* Copyright 2012 The Kuali Foundation
*
* Licensed under the Educational Community 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.opensource.org/licenses/ecl2.php
*
* 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.kuali.student.common.spring;
import java.io.Externalizable;
import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.io.Serializable;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import javax.xml.namespace.QName;
import org.kuali.rice.core.api.resourceloader.GlobalResourceLoader;
import org.springframework.util.ReflectionUtils;
/**
*
* A Serializable Proxy Invokation Handler. This handler is serializable and knows how to look up the service using the GlobalResourceLocator.
*
* @author Kuali Student Team
*
*/
public class SerializableProxyInvokationHandler implements InvocationHandler, Externalizable {
/**
*
*/
private static final long serialVersionUID = 1L;
private transient Object serviceDelegate;
private QName serviceName;
/**
*
*/
public SerializableProxyInvokationHandler() {
}
/**
* @param serviceName the serviceName to set
*/
public void setServiceName(QName serviceName) {
this.serviceName = serviceName;
}
/*
* (non-Javadoc)
*
* @see java.lang.reflect.InvocationHandler#invoke(java.lang.Object,
* java.lang.reflect.Method, java.lang.Object[])
*/
@Override
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
if (serviceDelegate == null) {
// first time or just after reserialization.
try {
serviceDelegate = GlobalResourceLoader.getService(serviceName);
} catch (Exception e) {
if (method.getName().equals("toString")) {
// fake toString
// spring has an assertion that expects this to work so we will just fake it
// once the delegate is resolved the normal toString method will be used.
return getClass().getName() + " (serviceName=" + serviceName + ")";
}
else
throw e;
}
}
// delegate the call to the actual service to fulfill.
return ReflectionUtils.invokeMethod(method, serviceDelegate, args);
}
/* (non-Javadoc)
* @see java.io.Externalizable#writeExternal(java.io.ObjectOutput)
*/
@Override
public void writeExternal(ObjectOutput out) throws IOException {
QName name = new QName(serviceName.getNamespaceURI(), serviceName.getLocalPart());
out.writeObject(name);
}
/* (non-Javadoc)
* @see java.io.Externalizable#readExternal(java.io.ObjectInput)
*/
@Override
public void readExternal(ObjectInput in) throws IOException,
ClassNotFoundException {
QName name = (QName) in.readObject();
this.serviceName = new QName (name.getNamespaceURI(), name.getLocalPart());
}
}