Activity   從當前任務 任意回退至已審批任務

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

*

* 任務回退

*

* 需求：從當前任務 任意回退至已審批任務

* 方法：通過activiti源代碼裏的sqlSession直接修改數據庫

*

* 第一步 完成歷史TASK覆蓋當前TASK

* 用hi_taskinst修改當前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

* 修改當前任務參與人列表

* 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_

*

* 第三步修改流程記錄節點 把ru_execution的ACT_ID_ 改爲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;

/*

* 實現回退方法

*/

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();

}

}