/**
*
* Copyright 2003-2004 The Apache Software Foundation
*
* 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.apache.geronimo.connector;
import javax.management.ObjectName;
import net.sf.cglib.proxy.Callback;
import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import org.apache.geronimo.gbean.DynamicGBean;
import org.apache.geronimo.gbean.DynamicGBeanDelegate;
import org.apache.geronimo.gbean.GBeanInfo;
import org.apache.geronimo.gbean.GBeanInfoFactory;
import org.apache.geronimo.gbean.GBeanLifecycle;
import org.apache.geronimo.gbean.WaitingException;
import org.apache.geronimo.kernel.Kernel;
/**
* Wrapper around AdminObject that exposes its config-properties as GBeanAttributes and
* supplies a disconnectable proxy to bind in jndi.
*
* @version $Revision: 1.11 $ $Date: 2004/07/12 06:07:50 $
*/
public class AdminObjectWrapper implements GBeanLifecycle, DynamicGBean {
private final Class adminObjectInterface;
private final Class adminObjectClass;
private final DynamicGBeanDelegate delegate;
private final Object adminObject;
private final Kernel kernel;
private final String objectName;
private ConnectorMethodInterceptor interceptor;
private Object proxy;
/**
* Default constructor required when a class is used as a GBean Endpoint.
*/
public AdminObjectWrapper() {
adminObjectInterface = null;
adminObjectClass = null;
adminObject = null;
delegate = null;
kernel = null;
objectName = null;
}
/**
* Normal managed constructor.
*
* @param adminObjectInterface Interface the proxy will implement.
* @param adminObjectClass Class of admin object to be wrapped.
* @param kernel name is used so proxy can find correct kernel.
* @param objectName is used by proxy to find this gbean to reconnect to.
* @throws IllegalAccessException
* @throws InstantiationException
*/
public AdminObjectWrapper(final Class adminObjectInterface,
final Class adminObjectClass,
final Kernel kernel,
final String objectName) throws IllegalAccessException, InstantiationException {
this.adminObjectInterface = adminObjectInterface;
this.adminObjectClass = adminObjectClass;
adminObject = adminObjectClass.newInstance();
delegate = new DynamicGBeanDelegate();
delegate.addAll(adminObject);
this.kernel = kernel;
this.objectName = objectName;
}
/**
* Returns class of wrapped AdminObject.
* @return class of wrapped AdminObject
*/
public Class getAdminObjectClass() {
return adminObjectClass;
}
/**
* Returns disconnectable proxy for binding in jndi.
* @return proxy implementing adminObjectInterface.
*/
public Object getProxy() {
return proxy;
}
/**
* Returns the MethodInterceptor the proxy communicates with when connected.
* @return MethodInterceptor the proxy calls.
*/
public Object getMethodInterceptor() {
return interceptor;
}
/**
* GBean start method.
* @throws WaitingException
* @throws Exception
*/
public void doStart() throws WaitingException, Exception {
if (proxy == null) {
//build proxy
Enhancer enhancer = new Enhancer();
enhancer.setSuperclass(adminObjectInterface);
enhancer.setCallbackType(MethodInterceptor.class);
//TODO is this correct?
enhancer.setUseFactory(false);
interceptor = new ConnectorMethodInterceptor(kernel.getKernelName(), ObjectName.getInstance(objectName));
enhancer.setCallbacks(new Callback[]{interceptor});
proxy = enhancer.create(new Class[0], new Object[0]);
}
//connect proxy
interceptor.setInternalProxy(adminObject);
}
/**
* GBean stop method.
* @throws WaitingException
* @throws Exception
*/
public void doStop() throws WaitingException, Exception {
//disconnect proxy
interceptor.setInternalProxy(null);
}
/**
* GBean fail method.
*/
public void doFail() {
}
//DynamicGBean implementation
/**
* Delegating DynamicGBean getAttribute method.
* @param name of attribute.
* @return attribute value.
* @throws Exception
*/
public Object getAttribute(final String name) throws Exception {
return delegate.getAttribute(name);
}
/**
* Delegating DynamicGBean setAttribute method.
* @param name of attribute.
* @param value of attribute to be set.
* @throws Exception
*/
public void setAttribute(final String name, final Object value) throws Exception {
delegate.setAttribute(name, value);
}
/**
* no-op DynamicGBean method
* @param name
* @param arguments
* @param types
* @return nothing, there are no operations.
* @throws Exception
*/
public Object invoke(final String name, final Object[] arguments, final String[] types) throws Exception {
//we have no dynamic operations.
return null;
}
public static final GBeanInfo GBEAN_INFO;
static {
GBeanInfoFactory infoFactory = new GBeanInfoFactory(AdminObjectWrapper.class);
infoFactory.addAttribute("adminObjectInterface", Class.class, true);
infoFactory.addAttribute("adminObjectClass", Class.class, true);
infoFactory.addAttribute("kernel", Kernel.class, false);
infoFactory.addAttribute("objectName", String.class, false);
infoFactory.addOperation("getProxy");
infoFactory.addOperation("getMethodInterceptor");
infoFactory.setConstructor(new String[]{
"adminObjectInterface",
"adminObjectClass",
"kernel",
"objectName"});
GBEAN_INFO = infoFactory.getBeanInfo();
}
public static GBeanInfo getGBeanInfo() {
return GBEAN_INFO;
}
}