/**
* Copyright 2007-2010 非也
* All rights reserved.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation。
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see http://www.gnu.org/licenses. *
*/
package org.fireflow.engine.invocation.impl;
import java.lang.reflect.InvocationTargetException;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import javax.script.ScriptException;
import javax.xml.namespace.QName;
import javax.xml.parsers.ParserConfigurationException;
import org.apache.commons.beanutils.MethodUtils;
import org.apache.ws.commons.schema.XmlSchemaCollection;
import org.fireflow.client.WorkflowSession;
import org.fireflow.client.impl.WorkflowSessionLocalImpl;
import org.fireflow.engine.context.RuntimeContext;
import org.fireflow.engine.entity.runtime.ActivityInstance;
import org.fireflow.engine.entity.runtime.ProcessInstance;
import org.fireflow.engine.exception.ServiceInvocationException;
import org.fireflow.engine.invocation.ServiceInvoker;
import org.fireflow.engine.modules.processlanguage.ProcessLanguageManager;
import org.fireflow.engine.modules.script.ScriptContextVariableNames;
import org.fireflow.engine.modules.script.ScriptEngineHelper;
import org.fireflow.model.binding.Assignment;
import org.fireflow.model.binding.ResourceBinding;
import org.fireflow.model.binding.ServiceBinding;
import org.fireflow.model.data.Expression;
import org.fireflow.model.servicedef.ServiceDef;
import org.firesoa.common.schema.DOMInitializer;
import org.firesoa.common.schema.NameSpaces;
import org.w3c.dom.Document;
/**
*
*
* @author 非也
* @version 2.0
*/
public abstract class AbsServiceInvoker implements ServiceInvoker {
// DocumentFactory docFactory = DocumentFactory.getInstance();
/*
* (non-Javadoc)
*
* @see
* org.fireflow.engine.service.ServiceExecutor#complete(org.fireflow.engine
* .WorkflowSession, org.fireflow.engine.entity.runtime.ActivityInstance,
* java.lang.Object)
*/
// public void onServiceCompleted(WorkflowSession session,
// ActivityInstance activityInstance) {
// RuntimeContext ctx = ((WorkflowSessionLocalImpl) session)
// .getRuntimeContext();
// ActivityInstanceManager activityInstanceMgr = ctx.getEngineModule(
// ActivityInstanceManager.class,
// activityInstance.getProcessType());
//
// activityInstanceMgr.onServiceCompleted(session, activityInstance);
//
// }
public int determineActivityCloseStrategy(WorkflowSession session,
ActivityInstance activityInstance, Object theActivity, ServiceBinding serviceBinding) {
return ServiceInvoker.CLOSE_ACTIVITY;
}
public boolean invoke(WorkflowSession session,
ActivityInstance activityInstance, ServiceBinding serviceBinding,
ResourceBinding resourceBinding, Object theActivity) throws ServiceInvocationException {
try {
WorkflowSessionLocalImpl sessionLocalImpl = (WorkflowSessionLocalImpl) session;
RuntimeContext runtimeContext = sessionLocalImpl
.getRuntimeContext();
ProcessInstance processInstance = sessionLocalImpl.getCurrentProcessInstance();
ProcessLanguageManager processUtil = runtimeContext.getEngineModule(ProcessLanguageManager.class, activityInstance.getProcessType());
ServiceDef svc = processUtil.getServiceDef(activityInstance,theActivity, serviceBinding.getServiceId());
if (svc==null){
ServiceInvocationException ex = new ServiceInvocationException("没有找到Id为"+serviceBinding.getServiceId()+"的服务");
ex.setErrorCode(ServiceInvocationException.SERVICE_DEF_NOT_FOUND);
ex.setActivityInstance(activityInstance);
throw ex;
}
// 1、首先获得Service Object
Object serviceObject = this.getServiceObject(runtimeContext,
session, activityInstance, serviceBinding,svc,theActivity);
if (serviceObject==null){
ServiceInvocationException ex = new ServiceInvocationException("无法初始化 service object，Service定义是[name="+svc.getName()+",displayName="+svc.getDisplayName()+"]");
ex.setErrorCode(ServiceInvocationException.SERVICE_OBJECT_NOT_FOUND);
ex.setActivityInstance(activityInstance);
throw new ServiceInvocationException();
}
// 2、然后获得被调用的Method
String methodName = this.getOperationName(runtimeContext,
session, activityInstance, serviceBinding);
if (methodName==null || methodName.trim().equals("")){
ServiceInvocationException ex = new ServiceInvocationException("服务没有名称为"+serviceBinding.getOperationName()+"的方法，Service定义是[name="+svc.getName()+",displayName="+svc.getDisplayName()+"]");
ex.setErrorCode(ServiceInvocationException.OPERATION_NOT_FOUND);
ex.setActivityInstance(activityInstance);
throw new ServiceInvocationException();
}
// 3、解析参数
Object[] params = resolveInputParams(runtimeContext, session,processInstance,
activityInstance, serviceBinding,svc);
// 4、获得参数类型
Class[] parameterTypes = this.getParameterTypes(serviceObject.getClass(), methodName, params);
// 5、调用
System.out.println("===Inside AbsServiceInvoker,serviceObject="+serviceObject);
System.out.println("===methodName is "+methodName);
System.out.println("===params is "+ java.util.Arrays.toString(params));
System.out.println("===params typs is "+ java.util.Arrays.toString(parameterTypes));
Object result = MethodUtils.invokeMethod(serviceObject, methodName,
params,parameterTypes);
// 6、返回值回写到流程系统中
assignOutputToVariable(runtimeContext, session,processInstance, activityInstance,
serviceBinding, result);
return true;
}
catch(ServiceInvocationException e){
if (e.getActivityInstance()==null){
e.setActivityInstance(activityInstance);
}
throw e;
}
catch (ScriptException e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
}
catch (SecurityException e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
} catch (NoSuchMethodException e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
} catch (IllegalArgumentException e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
} catch (IllegalAccessException e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
} catch (InvocationTargetException e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
}
catch (Exception e) {
ServiceInvocationException ex = new ServiceInvocationException(e);
ex.setErrorCode(findRootCause(e).getClass().getName());
ex.setActivityInstance(activityInstance);
throw ex;
}
}
private Throwable findRootCause(Throwable e){
if (e.getCause()==null){
return e;
}
return findRootCause(e.getCause());
}
protected abstract Object getServiceObject(RuntimeContext runtimeContext,
WorkflowSession session, ActivityInstance activityInstance,
ServiceBinding serviceBinding,ServiceDef serviceDef,Object activity)throws ServiceInvocationException;
public static Map<String ,Object> resolveInputAssignments(RuntimeContext runtimeContext,
WorkflowSession session,ProcessInstance processInstance, ActivityInstance activityInstance,
ServiceBinding serviceBinding,ServiceDef service)throws ScriptException{
List<Assignment> inputAssignmentList = serviceBinding.getInputAssignments();
// OperationDef operation = serviceBinding.getOperation();
// List<Input> inputs = operation.getInputs();
Map<String, Object> contextVars = ScriptEngineHelper.fulfillScriptContext(session,
runtimeContext, processInstance, activityInstance);
//初始化xml类型的input输入，所有的xml类型输入用org.w3c.dom.Document表示
Map<String,Object> inputsContext = new HashMap<String,Object>();
for (Assignment assignment : inputAssignmentList){
Expression toExpression = assignment.getTo();
if (toExpression.getName()==null || toExpression.getName().trim().equals("")){
throw new ScriptException("The name of the assignment's To-Expression can NOT be empty. More information : the body of the To-Expression is '"+toExpression.getBody()+"';the activity id is "+activityInstance.getNodeId());
}
if (toExpression.getDataType()!=null && !NameSpaces.JAVA.getUri().equals(toExpression.getDataType().getNamespaceURI())
&& inputsContext.get(toExpression.getName())==null){
Document doc = initDocument(service.getXmlSchemaCollection(),toExpression.getDataType());
inputsContext.put(toExpression.getName(), doc);
}
}
contextVars.put(ScriptContextVariableNames.INPUTS, inputsContext);
Map<String, Object> inputParamValues = ScriptEngineHelper
.resolveInputParameters(runtimeContext,
serviceBinding.getInputAssignments(),
contextVars);
return inputParamValues;
}
protected Object[] resolveInputParams(RuntimeContext runtimeContext,
WorkflowSession session,ProcessInstance processInstance, ActivityInstance activityInstance,
ServiceBinding serviceBinding,ServiceDef service)throws ScriptException {
Map<String,Object> inputParamValues = resolveInputAssignments(runtimeContext,session,processInstance,
activityInstance,serviceBinding,service);
List<Assignment> inputAssignmentList = serviceBinding.getInputAssignments();
// OperationDef operation = null;
// List<Input> inputs = operation.getInputs();
List<Object> args = new ArrayList<Object>();
for (Assignment assignment : inputAssignmentList) {
Expression toExpression = assignment.getTo();
if (inputParamValues!=null && inputParamValues.containsKey(toExpression.getName())){
Object paramValue = inputParamValues.get(toExpression.getName());
args.add(paramValue);
}else{
args.add(null);
//TODO 缺省参数需要处理吗？
//由于所有的接口采用java接口，貌似没有必要。
// String defaultValueAsString = _input.getDefaultValueAsString();
// if (StringUtils.isEmpty(defaultValueAsString)){
// args.add(null);
// }else {
// Object obj = JavaDataTypeConvertor.dataTypeConvert(_input.getDataType(), defaultValueAsString, _input.getDataPattern());
// args.add(obj);
// }
}
}
return args.toArray();
}
protected void assignOutputToVariable(RuntimeContext runtimeContext,
WorkflowSession session, ProcessInstance processInstance,ActivityInstance activityInstance,
ServiceBinding serviceBinding, Object result) throws ScriptException{
// OperationDef operation = serviceBinding.getOperation();
List<Assignment> outputAssignments = serviceBinding.getOutputAssignments();
if (outputAssignments==null || outputAssignments.size()==0)return ;//无赋值操作
Map<String,Object> scriptContext = new HashMap<String,Object>();
Map<String, Object> outputsResults = new HashMap<String, Object>();
Assignment assignment = outputAssignments.get(0);
Expression fromExp = assignment.getFrom();
outputsResults.put(fromExp.getName(), result);
scriptContext.put(ScriptContextVariableNames.OUTPUTS,
outputsResults);
//System.out.println("======待输出的结果是===="+outputsResults);
ScriptEngineHelper.assignOutputToVariable(session,runtimeContext,
processInstance,activityInstance, outputAssignments,
scriptContext);
}
/**
* 根据Schema创建org.w3c.dom.Document;
* TODO 对于Schema中的Choice指示器，将不创建子元素，所以在这种情况下，有可能出现问题。
* @param xmlSchemaCollection
* @param elementQName
* @return
*/
protected static Document initDocument(XmlSchemaCollection xmlSchemaCollection,
QName rootElementQName)throws ScriptException{
try{
Document doc = DOMInitializer.generateDocument(xmlSchemaCollection, rootElementQName);
return doc;
}catch(ParserConfigurationException e){
throw new ScriptException(e);
}
}
// protected org.dom4j.QName javaxQName4Dom4JQName(javax.xml.namespace.QName qNameIn){
// org.dom4j.Namespace ns = new org.dom4j.Namespace(qNameIn.getPrefix(),qNameIn.getNamespaceURI());
// org.dom4j.QName qName = new org.dom4j.QName(qNameIn.getLocalPart(),ns);
// return qName;
// }
protected String getOperationName(RuntimeContext runtimeContext,
WorkflowSession session, ActivityInstance activityInstance,
ServiceBinding serviceBinding)throws ServiceInvocationException{
return serviceBinding.getOperationName();
}
protected abstract Class[] getParameterTypes(Class serviceClass,String methodName, Object[] params)throws ServiceInvocationException;
}