Activiti从当前任务任意回退至已审批任务

import java.util.HashMap;import java.util.Iterator;import java.util.List;import java.util.Map;import org.activiti.engine.ActivitiException;import org.activiti.engine.RepositoryService;import org.activiti.engine.impl.ProcessEngineImpl;import org.activiti.engine.impl.RepositoryServiceImpl;import org.activiti.engine.impl.db.DbSqlSession;import org.activiti.engine.impl.db.DbSqlSessionFactory;import org.activiti.engine.impl.db.ListQueryParameterObject;import org.activiti.engine.impl.persistence.entity.ExecutionEntity;import org.activiti.engine.impl.persistence.entity.HistoricTaskInstanceEntity;import org.activiti.engine.impl.persistence.entity.IdentityLinkEntity;import org.activiti.engine.impl.persistence.entity.ProcessDefinitionEntity;import org.activiti.engine.impl.persistence.entity.TaskEntity;import org.activiti.engine.impl.pvm.process.ActivityImpl;import org.activiti.rest.api.ActivitiUtil;import org.apache.ibatis.session.SqlSession;import org.apache.ibatis.session.SqlSessionFactory;/** 2013.01.25** 任务回退** 需求：从当前任务 任意回退至已审批任务* 方法：通过activiti源代码里的sqlSession直接修改数据库** 第一步 完成历史TASK覆盖当前TASK* 用hi_taskinst修改当前ru_task* ru_task.ID_=hi_taskinst.ID_* ru_task.NAME_=hi_taskinst.NAME_* ru_task.TASK_DEF_KEY_=hi_taskinst.TASK_DEF_KEY_** 第二步* 修改当前任务参与人列表* ru_identitylink 用ru_task.ID_去ru_identitylink 索引* ru_identitylink.TASK_ID_=hi_taskinst.ID_* ru_identitylink.USER_ID=hi_taskinst.ASSIGNEE_** 第三步修改流程记录节点 把ru_execution的ACT_ID_ 改为hi_taskinst.TASK_DEF_KEY_** author:pvii007* version:1.0*/public class DbTaskReturn{public static final int I_NO_OPERATION = 0;public static final int I_DONE = 1;public static final int I_TASK_NOT_FOUND = 2;public static final int I_ROLLBACK = 3;/** 实现回退方法*/public static int dbBackTo(String currentTaskId, String backToTaskId){int result = DbTaskReturn.I_NO_OPERATION;SqlSession sqlSession = getSqlSession();TaskEntity currentTaskEntity = getCurrentTaskEntity(currentTaskId);HistoricTaskInstanceEntity backToHistoricTaskInstanceEntity = getHistoryTaskEntity(backToTaskId);if (currentTaskEntity == null || backToHistoricTaskInstanceEntity == null){return DbTaskReturn.I_TASK_NOT_FOUND;}String processDefinitionId = currentTaskEntity.getProcessDefinitionId();String executionId = currentTaskEntity.getExecutionId();String currentTaskEntityId = currentTaskEntity.getId();String backToHistoricTaskInstanceEntityId = backToHistoricTaskInstanceEntity.getId();String backToTaskDefinitionKey = backToHistoricTaskInstanceEntity.getTaskDefinitionKey();String backToAssignee = backToHistoricTaskInstanceEntity.getAssignee();boolean success = false;try{// 1.StepOne_use_hi_taskinst_to_change_ru_task(sqlSession, currentTaskEntity, backToHistoricTaskInstanceEntity);// 2.StepTwo_change_ru_identitylink(sqlSession, currentTaskEntityId, backToHistoricTaskInstanceEntityId,backToAssignee);// 3.StepThree_change_ru_execution(sqlSession, executionId, processDefinitionId, backToTaskDefinitionKey);success = true;}catch (Exception e){throw new ActivitiException("dbBackTo Exception", e);}finally{if (success){sqlSession.commit();result = DbTaskReturn.I_DONE;}else{sqlSession.rollback();result = DbTaskReturn.I_ROLLBACK;}sqlSession.close();}return result;}private static void StepThree_change_ru_execution(SqlSession sqlSession, String executionId,String processDefinitionId, String backToTaskDefinitionKey) throws Exception{List<ExecutionEntity> currentExecutionEntityList = sqlSession.selectList("selectExecution", executionId);if (currentExecutionEntityList.size() > 0){ActivityImpl activity = getActivitiImp(processDefinitionId, backToTaskDefinitionKey);Iterator<ExecutionEntity> execution = currentExecutionEntityList.iterator();while (execution.hasNext()){ExecutionEntity e = execution.next();e.setActivity(activity);p(sqlSession.update("updateExecution", e));}}}private static void StepTwo_change_ru_identitylink(SqlSession sqlSession, String currentTaskEntityId,String backToHistoricTaskInstanceEntityId, String backToAssignee) throws Exception{ListQueryParameterObject para = new ListQueryParameterObject();para.setParameter(currentTaskEntityId);List<IdentityLinkEntity> currentTaskIdentityLinkEntityList = sqlSession.selectList("selectIdentityLinksByTask",para);if (currentTaskIdentityLinkEntityList.size() > 0){Iterator<IdentityLinkEntity> identityLinkEntityList = currentTaskIdentityLinkEntityList.iterator();IdentityLinkEntity identityLinkEntity;TaskEntity tmpTaskEntity;tmpTaskEntity = new TaskEntity();tmpTaskEntity.setId(backToHistoricTaskInstanceEntityId);while (identityLinkEntityList.hasNext()){identityLinkEntity = identityLinkEntityList.next();identityLinkEntity.setTask(tmpTaskEntity);identityLinkEntity.setUserId(backToAssignee);Map<String, Object> parameters = new HashMap<String, Object>();parameters.put("id", identityLinkEntity.getId());sqlSession.delete("deleteIdentityLink", parameters);sqlSession.insert("insertIdentityLink", identityLinkEntity);}}}private static void StepOne_use_hi_taskinst_to_change_ru_task(SqlSession sqlSession, TaskEntity currentTaskEntity,HistoricTaskInstanceEntity backToHistoricTaskInstanceEntity) throws Exception{sqlSession.delete("deleteTask", currentTaskEntity);currentTaskEntity.setName(backToHistoricTaskInstanceEntity.getName());currentTaskEntity.setTaskDefinitionKey(backToHistoricTaskInstanceEntity.getTaskDefinitionKey());currentTaskEntity.setId(backToHistoricTaskInstanceEntity.getId());sqlSession.insert("insertTask", currentTaskEntity);}public static void p(Object o){System.out.println(o);}private static ActivityImpl getActivitiImp(String processDefinitionId, String taskDefinitionKey){RepositoryService repositoryService = ActivitiUtil.getRepositoryService();ProcessDefinitionEntity processDefinition = (ProcessDefinitionEntity) ((RepositoryServiceImpl) repositoryService).getDeployedProcessDefinition(processDefinitionId);List<ActivityImpl> activitiList = processDefinition.getActivities();boolean b;Object activityId;for (ActivityImpl activity : activitiList){activityId = activity.getId();b = activityId.toString().equals(taskDefinitionKey);if (b){return activity;}}return null;}private static TaskEntity getCurrentTaskEntity(String id){return (TaskEntity) ActivitiUtil.getTaskService().createTaskQuery().taskId(id).singleResult();}private static HistoricTaskInstanceEntity getHistoryTaskEntity(String id){return (HistoricTaskInstanceEntity) ActivitiUtil.getHistoryService().createHistoricTaskInstanceQuery().taskId(id).singleResult();}private static SqlSession getSqlSession(){ProcessEngineImpl processEngine = (ProcessEngineImpl) ActivitiUtil.getProcessEngine();DbSqlSessionFactory dbSqlSessionFactory = (DbSqlSessionFactory) processEngine.getProcessEngineConfiguration().getSessionFactories().get(DbSqlSession.class);SqlSessionFactory sqlSessionFactory = dbSqlSessionFactory.getSqlSessionFactory();return sqlSessionFactory.openSession();}}

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