Java tutorial
/* * Copyright 2010-2011 the original author or authors. * * 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 com.googlecode.starflow.engine.handle; import java.lang.reflect.Method; import java.util.Date; import java.util.concurrent.Callable; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.BeanUtils; import org.springframework.transaction.TransactionDefinition; import org.springframework.transaction.TransactionStatus; import com.googlecode.starflow.core.util.ApplicationContextHolder; import com.googlecode.starflow.engine.ExecutorService; import com.googlecode.starflow.engine.ProcessEngineException; import com.googlecode.starflow.engine.StarFlowState; import com.googlecode.starflow.engine.core.Constants; import com.googlecode.starflow.engine.event.AbstractFlowEvent; import com.googlecode.starflow.engine.event.ActivityStartEvent; import com.googlecode.starflow.engine.model.ActivityInst; import com.googlecode.starflow.engine.model.ProcessInstance; import com.googlecode.starflow.engine.model.elements.ActivityElement; import com.googlecode.starflow.engine.transaction.TransactionCallback; import com.googlecode.starflow.engine.transaction.TransactionTemplate; import com.googlecode.starflow.service.spi.IApplicationExecptionAction; /** * * @author libinsong1204@gmail.com * @version 1.0 */ public abstract class BaseHandlerAdapter implements IHandlerAdapter { protected final Logger logger = LoggerFactory.getLogger(getClass()); /** * * * suspend * ? * join???? * suspend?? * * @param event * @param actEl * @param activityXml * @param action * @param activityInst */ public void action(final ActivityStartEvent event, final ActivityInst activityInst, ActivityElement activityXml, final IAction action) { String invokePattern = activityXml.getInvokePattern(); final String transactionType = activityXml.getTransactionType(); ExecutorService executor = event.getProcessEngine().getExecutorService(); if (Constants.ACT_AUTO_CALL_SYN.equalsIgnoreCase(invokePattern)) { Object result = null; //???????? try { result = executor.execute(new Callable<Object>() { @Override public Object call() throws Exception { if (Constants.ACT_TRANSACTION_JOIN.equalsIgnoreCase(transactionType)) { return action.execute(event, activityInst); } else { return executeLogicInNewTransaction(event, activityInst, action); } } }, invokePattern); } catch (Exception e) { handleException(e, event, activityXml); } //? saveResultRelaData(event, result, activityXml); } else { //suspend try { executor.execute(new Callable<Object>() { public Object call() throws Exception { return executeLogicInNewTransaction(event, activityInst, action); } }, invokePattern); } catch (Exception e) { logger.error("Action", e); } } } /** * ? * @param result * @param activityXml */ protected abstract void saveResultRelaData(ActivityStartEvent event, Object result, ActivityElement activityXml); /** * ? * * @param e * @param event * @param activityXml */ protected void handleException(Exception e, ActivityStartEvent event, ActivityElement activityXml) { String exceptionStrategy = activityXml.getExceptionStrategy(); if (Constants.ACT_EXCEPTIONSTRATEGY_ROLLBACK.equals(exceptionStrategy)) throw new ToolAppRollBackException("Action", e); else if (Constants.ACT_EXCEPTIONSTRATEGY_INTERRUPT.equals(exceptionStrategy)) { long activityInstId = event.getActivityInst().getActivityInstId(); event.getActInstRep().updateActivityStateAndFinalTime(activityInstId, StarFlowState.ACT_APP_EXCEPTION, new Date()); throw new InterruptStrategyException(); } else if (Constants.ACT_EXCEPTIONSTRATEGY_APPLICATION.equals(exceptionStrategy)) { String beanName = activityXml.getExceptionAction(); ProcessInstance cloneProcessInstance = new ProcessInstance(); BeanUtils.copyProperties(event.getProcessInstance(), cloneProcessInstance); ActivityInst cloneActivityInst = new ActivityInst(); BeanUtils.copyProperties(event.getActivityInst(), cloneActivityInst); executeExceptionAction(beanName, e, cloneProcessInstance, cloneActivityInst); } else if (Constants.ACT_EXCEPTIONSTRATEGY_STEPROLLBACK.equals(exceptionStrategy)) { throw new UnsupportedOperationException("?"); } else { logger.error("Action", e); } } /** * ? * @param beanName * @param exception * @param cloneProcessInstance * @param cloneActivityInst * @return */ private void executeExceptionAction(String beanName, Exception exception, ProcessInstance cloneProcessInstance, ActivityInst cloneActivityInst) { try { //beanName ????IToolAppAction.execute int index = beanName.indexOf("#"); IApplicationExecptionAction action = ApplicationContextHolder.getBean(beanName, IApplicationExecptionAction.class); if (index == -1) { action.execute(exception, cloneProcessInstance, cloneActivityInst); } else { //??bean String methodName = beanName.substring(index + 1); if ("".equals(beanName)) throw new ProcessEngineException("IApplicationExecptionAction Bean" + beanName + "??"); beanName = beanName.substring(0, index); try { Method method = action.getClass().getMethod(methodName, long.class, long.class); method.invoke(action, exception, cloneProcessInstance, cloneActivityInst); } catch (Exception e) { throw new ProcessEngineException( "IApplicationExecptionAction Bean" + beanName + "", e); } } } catch (Exception e) { throw new ProcessEngineException("?", e); } } /** * ? * * @param event * @param activityInst * @param action * @return */ protected Object executeLogicInNewTransaction(final AbstractFlowEvent event, final ActivityInst activityInst, final IAction action) { TransactionTemplate template = event.getProcessEngine().getTransactionTemplate(); return template.execute(TransactionDefinition.PROPAGATION_REQUIRES_NEW, new TransactionCallback<Object>() { @Override public Object doInTransaction(TransactionStatus status) { return action.execute(event, activityInst); } }); } protected static interface IAction { public Object execute(AbstractFlowEvent event, ActivityInst activityInst); } }