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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.tuscany.sca.core.invocation.impl;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import org.apache.tuscany.sca.context.ThreadMessageContext;
import org.apache.tuscany.sca.core.context.impl.CallbackServiceReferenceImpl;
import org.apache.tuscany.sca.core.invocation.Constants;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.invocation.InvocationChain;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.apache.tuscany.sca.invocation.MessageFactory;
import org.apache.tuscany.sca.runtime.Invocable;
import org.apache.tuscany.sca.runtime.RuntimeEndpoint;
import org.apache.tuscany.sca.runtime.RuntimeEndpointReference;
import org.oasisopen.sca.ServiceReference;
import org.oasisopen.sca.ServiceRuntimeException;
/**
* Responsible for dispatching to a callback through a wire. <p/> TODO cache
* target invoker
*
* @version $Rev$ $Date$
*/
public class JDKCallbackInvocationHandler extends JDKInvocationHandler {
private static final long serialVersionUID = -3350283555825935609L;
public JDKCallbackInvocationHandler(MessageFactory messageFactory, ServiceReference<?> ref) {
super(messageFactory, ref);
this.fixedWire = false;
}
@Override
@SuppressWarnings( {"unchecked", "rawtypes"})
public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
if (Object.class == method.getDeclaringClass()) {
return invokeObjectMethod(method, args);
}
// obtain a dedicated wire to be used for this callback invocation
RuntimeEndpointReference wire = ((CallbackServiceReferenceImpl)callableReference).getCallbackEPR();
if (wire == null) {
//FIXME: need better exception
throw new ServiceRuntimeException("No callback wire found");
}
setEndpoint(((CallbackServiceReferenceImpl)callableReference).getResolvedEndpoint());
InvocationChain chain = getInvocationChain(method, wire);
if (chain == null) {
throw new IllegalArgumentException("No matching operation is found: " + method);
}
try {
String msgID = ((CallbackServiceReferenceImpl)callableReference).getMsgID();
return invoke(method, chain, args, wire, msgID );
} catch (InvocationTargetException e) {
Throwable t = e.getCause();
throw t;
} finally {
// allow the cloned wire to be reused by subsequent callbacks
}
}
/**
* Invoke the chain
* @param chain - the chain
* @param args - arguments to the invocation as an array of Objects
* @param source - the Endpoint or EndpointReference to which the chain relates
* @param msgID - ID of the message to which this invovation is a callback - ID ends up in "RELATES_TO" header
* @return - the Response message from the invocation
* @throws Throwable - if any exception occurs during the invocation
*/
@Override
protected Object invoke(Method method, InvocationChain chain, Object[] args, Invocable source, String msgID)
throws Throwable {
Message msg = messageFactory.createMessage();
if (source instanceof RuntimeEndpointReference) {
msg.setFrom((RuntimeEndpointReference)source);
}
if (target != null) {
msg.setTo(target);
} else {
if (source instanceof RuntimeEndpointReference) {
msg.setTo(((RuntimeEndpointReference)source).getTargetEndpoint());
}
}
msg.getHeaders().put(Constants.CALLBACK, ((CallbackServiceReferenceImpl)callableReference).getCallbackHandler());
Invoker headInvoker = chain.getHeadInvoker();
Operation operation = null;
if(source instanceof RuntimeEndpoint) {
for (InvocationChain c : source.getInvocationChains()) {
Operation op = c.getTargetOperation();
if (method.getName().equals(op.getName())) {
operation = op;
break;
}
}
} else {
operation = chain.getTargetOperation();
}
msg.setOperation(operation);
msg.setBody(args);
Message msgContext = ThreadMessageContext.getMessageContext();
// Deal with header information that needs to be copied from the message context to the new message...
transferMessageHeaders( msg, msgContext);
ThreadMessageContext.setMessageContext(msg);
// If there is a supplied message ID, place its value into the Message Header under "RELATES_TO"
if( msgID != null ){
msg.getHeaders().put(Constants.RELATES_TO, msgID);
} // end if
try {
// dispatch the source down the chain and get the response
Message resp = headInvoker.invoke(msg);
Object body = resp.getBody();
if (resp.isFault()) {
throw (Throwable)body;
}
return body;
} finally {
ThreadMessageContext.setMessageContext(msgContext);
}
} // end method invoke
}
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