/*
* 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.implementation.bpel.provider;
import java.lang.reflect.InvocationTargetException;
import java.util.concurrent.Future;
import javax.transaction.SystemException;
import javax.transaction.TransactionManager;
import javax.wsdl.Part;
import javax.wsdl.Service;
import javax.xml.namespace.QName;
import org.apache.ode.bpel.iapi.MyRoleMessageExchange;
import org.apache.ode.bpel.iapi.MessageExchange.Status;
import org.apache.ode.utils.DOMUtils;
import org.apache.ode.utils.GUID;
import org.apache.tuscany.sca.implementation.bpel.ode.EmbeddedODEServer;
import org.apache.tuscany.sca.interfacedef.Interface;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.wsdl.WSDLInterface;
import org.apache.tuscany.sca.invocation.Invoker;
import org.apache.tuscany.sca.invocation.Message;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Implements a target invoker for BPEL component implementations.
*
* The target invoker is responsible for dispatching invocations to the particular
* component implementation logic. In this example we are simply delegating the
* CRUD operation invocations to the corresponding methods on our fake
* resource manager.
*/
public class BPELInvoker implements Invoker {
private EmbeddedODEServer odeServer;
private TransactionManager txMgr;
private Operation operation;
private QName bpelServiceName;
private String bpelOperationName;
private Part bpelOperationInputPart;
private Part bpelOperationOutputPart;
public BPELInvoker(Operation operation, EmbeddedODEServer odeServer, TransactionManager txMgr) {
this.operation = operation;
this.bpelOperationName = operation.getName();
this.odeServer = odeServer;
this.txMgr = txMgr;
initializeInvocation();
}
private void initializeInvocation() {
Interface interfaze = operation.getInterface();
if(interfaze instanceof WSDLInterface){
WSDLInterface wsdlInterface = null;
wsdlInterface = (WSDLInterface) interfaze;
Service serviceDefinition = (Service) wsdlInterface.getWsdlDefinition().getDefinition().getAllServices().values().iterator().next();
bpelServiceName = serviceDefinition.getQName();
bpelOperationInputPart = (Part) wsdlInterface.getPortType().getOperation(bpelOperationName,null,null).getInput().getMessage().getParts().values().iterator().next();
bpelOperationOutputPart = (Part) wsdlInterface.getPortType().getOperation(bpelOperationName,null,null).getOutput().getMessage().getParts().values().iterator().next();
}
}
public Message invoke(Message msg) {
try {
Object[] args = msg.getBody();
Object resp = doTheWork(args);
msg.setBody(resp);
} catch (InvocationTargetException e) {
msg.setFaultBody(e.getCause());
}
return msg;
}
public Object doTheWork(Object[] args) throws InvocationTargetException {
Element response = null;
if(! (operation.getInterface() instanceof WSDLInterface)) {
throw new InvocationTargetException(null,"Unsupported service contract");
}
org.apache.ode.bpel.iapi.MyRoleMessageExchange mex = null;
Future onhold = null;
//Process the BPEL process invocation
try {
txMgr.begin();
mex = odeServer.getBpelServer().getEngine().createMessageExchange(new GUID().toString(),
bpelServiceName,
bpelOperationName);
onhold = mex.invoke(createInvocationMessage(mex, args));
txMgr.commit();
} catch (Exception e) {
try {
txMgr.rollback();
} catch (SystemException se) {
}
throw new InvocationTargetException(e, "Error invoking BPEL process : " + e.getMessage());
}
// Waiting until the reply is ready in case the engine needs to continue in a different thread
if (onhold != null) {
try {
onhold.get();
} catch (Exception e) {
throw new InvocationTargetException(e,"Error invoking BPEL process : " + e.getMessage());
}
}
//Process the BPEL invocation response
try {
txMgr.begin();
// Reloading the mex in the current transaction, otherwise we can't
// be sure we have the "freshest" one.
mex = (MyRoleMessageExchange)odeServer.getBpelServer().getEngine().getMessageExchange(mex.getMessageExchangeId());
Status status = mex.getStatus();
System.out.println("Status: " + status.name());
Element invocationResponse = mex.getResponse().getMessage();
System.out.println("Response: " + DOMUtils.domToString(invocationResponse));
//process the method invocation result
response = processResponse(invocationResponse);
txMgr.commit();
// end of transaction two
} catch (Exception e) {
try {
txMgr.rollback();
} catch (SystemException se) {
}
throw new InvocationTargetException(e, "Error retrieving BPEL process invocation status : " + e
.getMessage());
}
return response;
}
/**
* Create BPEL Invocation message
*
* BPEL invocation message like :
* <message>
* <TestPart>
* <hello xmlns="http://tuscany.apache.org/implementation/bpel/example/helloworld.wsdl">Hello</hello>
* </TestPart>
* </message>
* @param args
* @return
*/
private org.apache.ode.bpel.iapi.Message createInvocationMessage(org.apache.ode.bpel.iapi.MyRoleMessageExchange mex, Object[] args) {
Document dom = DOMUtils.newDocument();
Element contentMessage = dom.createElement("message");
Element contentPart = dom.createElement(bpelOperationInputPart.getName());
Element contentInvocation = (Element) args[0];
contentPart.appendChild(dom.importNode(contentInvocation, true));
contentMessage.appendChild(contentPart);
dom.appendChild(contentMessage);
System.out.println("::arg:::::: " + DOMUtils.domToString((Element) args[0]));
System.out.println("::message:: " + DOMUtils.domToString(dom.getDocumentElement()));
org.apache.ode.bpel.iapi.Message request = mex.createMessage(new QName("", ""));
request.setMessage(dom.getDocumentElement());
return request;
}
/**
* Process BPEL response
*
* <message>
* <TestPart>
* <hello xmlns="http://tuscany.apache.org/implementation/bpel/example/helloworld.wsdl">World</hello>
* </TestPart>
* </message>
*
* @param response
* @return
*/
private Element processResponse(Element response) {
return (Element) DOMUtils.findChildByName(response, new QName("",bpelOperationOutputPart.getName()));
}
}