UML软件工程组织

 

 

一个Jbpm员工请假流程的实例
 
作者:吴大愚 来源:.csdn.
 


适用于jbpm3.1版本

1. 概述

此实例包括的是一个员工请假审批的流程实例,和流程相关的代码以及相应的测试代码。此流程在Eclipse3.1.2 ,JBoss-IDE 1.6环境下测试通过。

说明,这篇文章说使用的流程实例是,学习《一个JBPM工作流管理示例》文章中的流程而来。原文中的流程实例不是jbpm3.1版本,不能适用于jbpm3.1。本人将其改写,并加入自己的设计和实现。原文地址为http://blogger.org.cn/blog/more.asp?name=lhwork&id=16137。可以对照学习。

2. 流程说明

假设应用背景如下:

在某一公司中,部门员工要休假的话需要部门主管的批准。如果休假天数大于10天的话,在部门主管的同意后,还必须老板批准。如果是部门主管要休假只要老板批准即可。在休假被批准之前,申请人可以撤销休假申请。

每次休假申请结束之后,不管通过未通过或是否取消,都必须记录下来。主管在批复申请之后,系统要将批复结果Email给申请人。对于大于10天的申请,如果部门主管已批准同意而上级主管还未批准,这时申请人撤销申请后,系统应发Email通知部门主管申请已撤销。

3. 流程定义

3.1. 原文件

<?xml version="1.0" encoding="UTF-8"?>

<process-definition

xmlns="urn:jbpm.org:jpdl-3.1" name="MyRequest">

<start-state name="SS_Request">

<transition name="" to="TN_WriteRequest"></transition>

</start-state>

<task-node name="TN_WriteRequest">

<task name="Task_WriteRequest">

<controller>

<variable name="dayCount" access="read,write,required"></variable>

</controller>

<assignment class="com.myrequest.task.WriteRequestAssignmentHandler"></assignment>

</task>

<transition name="Tr_WriteLeave" to="Fork_request">

<action name="Ac_WriteLeave" class="com.myrequest.action.WriteLeaveActionHandler"></action>

</transition>

</task-node>

<fork name="Fork_request">

<transition name="Tr_Cancel" to="TN_RequesterCancel"></transition>

<transition name="Tr_Request" to="Deci_IsChiefHere">

<action name="Ac_GetChiefState" class="com.myrequest.action.GetChiefStateActionHandler"></action>

</transition>

</fork>

<decision name="Deci_IsChiefHere">

<handler class="com.myrequest.decision.IsChiefHereDecisionHandler"/>

<transition name="Tr_Chief" to="TN_ChiefDecide"></transition>

<transition name="Tr_Boss" to="TN_BossDecide"></transition>

</decision>

<task-node name="TN_RequesterCancel">

<task name="Task_CancelRequest">

<assignment class="com.myrequest.task.CancelRequestAssignmentHandler"></assignment>

</task>

<transition name="Tr_RequestCancel" to="Join_Request">

<action name="Ac_RequestCancel" class="com.myrequest.action.RequestCancelActionHandler"></action>

</transition>

</task-node>

<task-node name="TN_ChiefDecide">

<task name="Task_ChiefDecide">

<assignment class="com.myrequest.task.ChiefDecideAssignmentHandler"></assignment>

</task>

<transition name="Tr_ChiefApprove" to="Deci_NeedBossDecide">

<action name="Ac_ChiefApprove" class="com.myrequest.action.ChiefApproveActionHandler"></action>

</transition>

<transition name="Tr_ChiefNotApprove" to="Join_Request">

<action name="Ac_ChiefNotApprove" class="com.myrequest.action.ChiefNotApproveActionHandler"></action>

</transition>

</task-node>

<join name="Join_Request">

<transition name="Tr_Join" to="Deci_DoSomething"></transition>

</join>

<decision name="Deci_NeedBossDecide">

<handler class="com.myrequest.decision.NeedBossDecideDecisionHandler"/>

<transition name="Tr_Need" to="TN_BossDecide"></transition>

<transition name="Tr_NotNeed" to="Join_Request">

<action name="Ac_NotNeed" class="com.myrequest.action.NotNeedActionHandler"></action>

</transition>

</decision>

<task-node name="TN_BossDecide">

<task name="Task_BossDecide">

<assignment class="com.myrequest.task.BossDecideAssignmentHandler"></assignment>

</task>

<transition name="Tr_BossApprove" to="Join_Request">

<action name="Ac_BossApprove" class="com.myrequest.action.BossApproveActionHandler"></action>

</transition>

<transition name="Tr_BossNotApprove" to="Join_Request">

<action name="Ac_BossNotApprove" class="com.myrequest.action.BossNotApproveActionHandler"></action>

</transition>

</task-node>

<decision name="Deci_DoSomething">

<handler class="com.myrequest.decision.DoSomethingDecisionHandler"/>

<transition name="Tr_Approve" to="ES_Finished">

<action name="Ac_Approve" class="com.myrequest.action.ApproveActionHandler"></action>

</transition>

<transition name="Tr_NotApprove" to="ES_Finished">

<action name="Ac_NotApprove" class="com.myrequest.action.NotApproveActionHandler"></action>

</transition>

<transition name="Tr_Cancel" to="ES_Finished">

<action name="Ac_Cancel" class="com.myrequest.action.CancelActionHandler"></action>

</transition>

</decision>

<end-state name="ES_Finished">

<event type="node-enter">

<action name="Ac_Finished" class="com.myrequest.action.FinishedActionHandler"></action>

</event>

</end-state>

</process-definition>

3.2. 流程图片

3.3. 说明

3.3.1. 命名规则

start-state的定义为SS_

end-state的定义为ES_

task-node的定义为TN_

fork的定义为Fork_

join的定义为Join_

task的定义为Task_

transition的定义为Tr_

action的定义为Ac_

3.3.2. join节点类型

join结点Join_Request,采用的是Discriminator模式,即只要有一个fork发出的分支到达join,流程就可以向下进行。

Join共有三中模式:

  • 默认的是所有fork发出的分支都到达,流程才向下进行;
  • 第二种就是Discriminator模式,只要有一个fork发出的分支到达join,流程就可以向下进行;
  • 第三种是设置当有n个分支到达之后,流程就可以向下进行。

但jpdl语言在jbpm3.1版本中还不支持对第二,第三两种模式的设置。需要在流程实例化之后,来制定join的模式。具体如何实现,参见后面有关代码部分。

3.3.3. 申请状态

系统存在一个有关申请的状态。系统用流程变量RequestState来存储。共有五个状态。存储在com.myrequest.RequestState.java文件中。

在用户启动此请假流程,完成第一个填写请假申请的任务实例后,此状态置为REQUEST。在完成取消请求任务之后,状态改为CANCEL。等等,读者可以仔细阅读流程定义和对应的代码。

要说明的是所有的状态修改都在完成任务之后的边上执行Action中来修改的。这样虽然增加了很多Action,但是状态修改明确。但对于这样的简单问题,前台代码在实际任务完整之后,就可以调用修改此状态变量。此处将这些修改都放在Action里面,也有一定演示的含义。

3.3.4. 取消请假任务说明

在fork节点后,产生两个并行分支。其中一个TN_RequestCancel任务节点包含一个Task_CancelRequest的任务。当此分支执行到这里时,会把这个任务分配给启动流程的用户。在流程没有结束的时候,如果用户执行这个任务,就表示用户要取消请假申请。在这个取消申请的任务会修改请假状态,在此任务结束后,就会首先到达join节点。表示取消了此次申请操作。

4. 代码说明

4.1. 代码包结构

本实例是在Eclipse3.1.2里面实现的。

在src/java目录下面,有包:

  • com.myrequest
    • 存放流程的公共信息,包括:
    • interface RequestState,用来存放请求状态的5种状态
    • interface RequestVariable 存放流程实例的变量名
  • com.myrequest.action
    • 存放流程中所有的ActionHandler类
    • 共有12个类,每个类对应流程中一个action的代码。
  • com.myrequest.task
    • 存放流程中所有的task的AssignmentHandler分配类
    • 共有4个类,对应4个task
  • com.myrequest.decision
    • 存放流程中所有的decision节点的判断类
    • 包括3个类,对应3个Decision节点

在src/test目录下面,有包:

  • com.myrequest
    • 包含此流程的测试类 MyRequestProcessTest.java

在processes目录下面,有:

  • 流程定义文件夹MyRequest,包含:
    • Gpd.xml
    • Processdefinition.xml
    • Processimage.jpg

4.2. 流程代码说明

对流程中使用到的和Action,task,decision相关的类,以及测试类进行说明。

4.2.1. Action代码说明

流程中的Action都使用指定类的形式来完成Action的操作。

例如:

<transition name="Tr_WriteLeave" to="Fork_request">

<action name="Ac_WriteLeave" class="com.myrequest.action.WriteLeaveActionHandler"></action>

</transition>

当流程执行到边Tr_WriteLeave后,就会自动去执行Action里面指定的类WriteLeaveActionHandler。

类WriteLeaveActionHandler实现了接口ActionHandler。此接口就一个函数

public void execute(ExecutionContext executionContext)

当流程执行这个类的时候,就会去调用这个函数。所以我们Action所要完成的工作也都写在这个函数中。

在RequestBeginActionHandler.execute()中,我们只做了将整个流程的请求状态设置为REQEUST状态。

4.2.2. Task代码说明

所有Task都是在Task-node中描述的。Task都是人工任务,也就是说需要先将task分配给那个人,然后由这个人来完成。在人开始任务的时候,可以调用taskInstance的start()操作,表明任务开始。(start()操作是可选的,也可以不调用) 在任务结束后,可以调用taskInstance的end()操作,表示任务实例结束。如果是整个task-node中的最后一个task的end()操作,那么就会这个end操作就会触发流程继续向下走。

例如:

<task name="Task_WriteRequest">

<controller>

<variable name="dayCount" access="read,write,required"></variable>

</controller>

<assignment class="com.myrequest.task.WriteRequestAssignmentHandler"></assignment>

</task>

当流程实例化Task_WriteRequest这个task后,首先会使用WriteRequestAssignmentHandler类来进行任务的分配。WriteRequestAssignmentHandler类实现了AssignmentHandler接口,包含一个
public void assign(Assignable assignable, ExecutionContext executionContext)接口。其中参数assignable就是此任务实例的引用(TaskInstance实现了Assignable接口)。因此我们只要调用assignable.setActorId(String userid),就可以把这个任务分配给userid所代表的用户来执行了。

对于前台,当用户登陆后,通过org.jbpm.db.TaskMgmtSession.findTaskInstances(java.lang.String actorId)就可以得到当前用户所有要执行的任务了,这里的任务是属于多个不同的流程实例的。如果查看数据库就会发现在jbpm_taskInstance表中,每一个taskinstance在actorId_字段记录的是次任务实例分配人员的用户名。这也就是上面所说的findTaskInstances方法如何工作的关键之处。

在WriteRequestAssignmentHandler .assign()里面,我们首先读入流程变量userId,然后将任务分配给这个userId。

如何调用任务实例的end,来表示任务实例的完成呢?真正的系统中应该是在前台,当客户通过web或是客户端触发操作,然后执行对应的任务实例的end操作。但是在我们的代码中只能通过在junit的测试代码中来模拟。具体参见后面讲解测试代码部分。

4.2.3. Decision代码说明

Decision节点可以有多种方式来进行条件判断。

方法一是在每条出边上加一个beanshell的表达式,jbpm引擎会按照流程定义文档中边的顺序一次调用,来判断那个表达式为true,当发现第一个为true的时候,流程就走这条边了。

方法二就是对Decision节点配置一个handler。通过一个类来实现条件判断。

例如:

<decision name="Deci_IsChiefHere">

<handler class="com.myrequest.decision.IsChiefHereDecisionHandler"/>

<transition name="Tr_Chief" to="TN_ChiefDecide"></transition>

<transition name="Tr_Boss" to="TN_BossDecide"></transition>

</decision>

表示当执行到Deci_IsChiefHere节点后,会自动执行IsChiefHereDecisionHandler类。IsChiefHereDecisionHandler实现了DecisionHandler接口。此接口包含一个方法public String decide(ExecutionContext executionContext) throws Exception 这个方法应该返回一个transition的name,表示选择走那条边。

这IsChiefHereDecisionHandler.decide()操作中,我们首先读取流程变量isChiefHere,然后判断走那条边。

4.3. 流程测试类代码说明

4.3.1. 测试类整体说明

测试类为com.myrequest. MyRequestProcessTest

包含三个设施函数,分别为

  • test14DayAndBossNotApprove()
    • 测试员工申请14天假期,部门主管批准,但老板不批准
  • test4DayAndChiefApprove()
    • 测试员工申请14天假期,部门主管批准,(不需要老板批准)
  • test14DayAndChiefApproveAndUserCancel()
    • 测试员工申请14天假期,部门主管批准,在老板审批前员工自己撤销申请

每个测试前都执行setUp()操作,这个操作用来设置流程中两个变量,一个是用户id,另外一个是部门主管是否在岗的状态。可以修改这两个参数,进行不同的测试。尤其是第二个参数,会影响流程的走向,可以分别设置为true和false以观察流程的走向和结果。

在测试类中还有7个辅助函数。分别为:

  • deployProcessDefinition()
    • 流程部署
  • createProcessInstance()
    • 创建流程实例
    • 设置join节点的性质为Discriminator模式(参见流程定义部分)
    • 设置流程相关变量
    • 启动流程
  • userWriteRequest(int daycount)
    • 模拟申请员工完成Task_WriteRequest任务,参数为请假的天数
  • chiefDecide(boolean isApprove)
    • 模拟部门主管完成Task_ ChiefDecide任务,参数为部门主管是否批准
  • bossDecide(boolean isApprove)
    • 模拟老板完成Task_ BossDecide任务,参数为老板是否批准
  • userCancel()
    • 模拟申请员工完成Task_ CancelRequest任务
  • checkTasks()
    • 检查整个流程中所有的任务的相关信息

4.3.2. checkTasks()说明

checkTasks()的核心是pi.getTaskMgmtInstance().getTaskInstances();返回流程实例的所有任务实例列表。但要说明的是所返回的任务实例列表和当前流程执行的位置有关,在流程开始处,流程执行中间,和流程执行结束处调用得到的任务实例列表不同。列表包含已经完成的任务实例和当前任务实例。

本来在此方法中还有现实每个任务实例起始时间和结束时间的操作。但发现返回全部为null。这说明在没有使用数据库是,有关时间的属性是不可用的。也就是说,这些时间属性都是记录在数据库jbpm_taskInstance表中的。没有用数据库自然就得不到,它不会保留在内存的流程实例中。要说明的是jbpm_taskInstance表的start字段如果有时间,表示任务实例已经开始执行。如果end字段有时间,表示任务实例已经结束,此任务已经完成。

4.3.3. 测试中有关任务实例获取的说明

因为没有使用数据库,所以不能使用org.jbpm.db.TaskMgmtSession.findTaskInstances(java.lang.String actorId)得到不同用户的当前任务。所以只能便利当前流程实例任务列表,从中找到相应的任务来操作。

如果有人有更好的办法,请留言告知,谢谢:)

5. 实例不足和待学习地方

5.1. 不足

没有使用swimlane,可以添加swimlane来进行任务分配。像websale就是有角色的。主要的原因是对swimlane的使用我还没有搞清楚。我有关swimlane的学习心得会在下一篇对jbpm自带实例websale的分析中来描述。

5.2. 学习点

通过这个实例,我发现org.jbpm.module.exe.ModuleInstance类有很多创建任务实例的方法,例如createTaskInstance(Task task)等等。我一直认为任务的实例化是在流程执行过程中,又工作流引擎来做的工作。不知道在我们写的代码中需要用到创建流程这样的方法吗?如果要用的话,在什么情况下会用到呢?

此外还有很多问题没有搞懂,比如jbpm的模块化思想,它的Ioc实现等等。慢慢学习吧。

6. 完整代码

代码太多,贴还是不贴呢,这是个问题啊。

6.1. MyRequestProcessTest

package com.myrequest;

import org.jbpm.graph.node.*;

import java.io.FileInputStream;

import java.util.*;

import org.jbpm.graph.def.ProcessDefinition;

import org.jbpm.graph.exe.ProcessInstance;

import org.jbpm.taskmgmt.*;

import org.jbpm.identity.*;

import org.jbpm.context.exe.ContextInstance;

import org.jbpm.taskmgmt.exe.*;

import junit.framework.TestCase;

import com.myrequest.*;

public class MyRequestProcessTest extends TestCase {

//static JbpmConfiguration cfg = JbpmConfiguration.getInstance();

ProcessDefinition pdf ;

ProcessInstance pi;

String userId;

boolean isChiefHere;

public void setUp(){

userId = "dust";

isChiefHere=true;

}

public void test14DayAndBossNotApprove() throws Exception {

this.deployProcessDefinition() ;

this.createProcessInstance() ;

this.userWriteRequest(14) ;

this.chiefDecide(true) ;

this.bossDecide(false);

this.checkTasks();

}

public void test4DayAndChiefApprove() throws Exception {

this.deployProcessDefinition() ;

this.createProcessInstance() ;

this.userWriteRequest(4) ;

this.chiefDecide(true) ;

this.checkTasks();

}

public void test14DayAndChiefApproveAndUserCancel() throws Exception {

this.deployProcessDefinition() ;

this.createProcessInstance() ;

this.userWriteRequest(14) ;

this.chiefDecide(true) ;

this.userCancel();

this.checkTasks();

}

protected void deployProcessDefinition() throws Exception{

System.out.println("==MyRequestProcessTest.deployProcessDefinition()==");

FileInputStream fis = new FileInputStream("processes/MyRequest/processdefinition.xml");

pdf = ProcessDefinition.parseXmlInputStream(fis);

assertNotNull("Definition should not be null", pdf);

}

protected void createProcessInstance() throws Exception{

System.out.println("==MyRequestProcessTest.createProcessInstance()==");

assertNotNull("Definition should not be null", pdf);

pi = new ProcessInstance(pdf);

assertNotNull("processInstance should not be null", pi);

Join join_Request = (Join)pi.getProcessDefinition().getNode("Join_Request");

assertNotNull("should find join_request node !",join_Request);

join_Request.setDiscriminator( true);

//设置申请人

pi.getContextInstance() .createVariable(RequestVariable.userId,this.userId);

//设置流程运行是,部门主管是否在岗

pi.getContextInstance() .createVariable(RequestVariable.isChiefHere,new Boolean(this.isChiefHere));

//启动流程

pi.getRootToken().signal();

}

/**

* @param daycount 请假天数

* */

protected void userWriteRequest(int daycount){

System.out.println("==MyRequestProcessTest.userWriteRequest()==");

TaskInstance wr = (TaskInstance)pi.getTaskMgmtInstance().getTaskInstances().iterator() .next() ;

assertEquals(this.userId,wr.getActorId()) ;

ContextInstance ci = pi.getContextInstance();

ci.setVariable("dayCount",new Integer(daycount));

wr.end();

}

/**

* @param isApprove 部门主管是否同意请假

* */

protected void chiefDecide(boolean isApprove){

System.out.println("==MyRequestProcessTest.chiefDecide()==");

//String chiefId="today123";

/**

* 如果后台使用数据库的话,就可以使用

* org.jbpm.db.TaskMgmtSession.findTaskInstances(java.lang.String actorId) 得到所有分配给chiefId的taskInstance

* */

Collection coll = pi.getTaskMgmtInstance().getTaskInstances();

Iterator it = coll.iterator();

while(it.hasNext()){

TaskInstance ti = (TaskInstance)it.next();

if(ti.getName().equals("Task_ChiefDecide")){

assertEquals("today123",ti.getActorId());

if(isApprove)

ti.end("Tr_ChiefApprove");

else

ti.end("Tr_ChiefNotApprove");

return;

}

}

}

/**

* @param isApprove 老板是否同意请假

* */

protected void bossDecide(boolean isApprove){

System.out.println("==MyRequestProcessTest.bossDecide()==");

//String bossId="elena";

/**

* 如果后台使用数据库的话,就可以使用

* org.jbpm.db.TaskMgmtSession.findTaskInstances(java.lang.String actorId) 得到所有分配给bossId的taskInstance

* */

Collection coll = pi.getTaskMgmtInstance().getTaskInstances();

Iterator it = coll.iterator();

while(it.hasNext()){

TaskInstance ti = (TaskInstance)it.next();

if(ti.getName().equals("Task_BossDecide")){

assertEquals("elena",ti.getActorId());

if(isApprove)

ti.end("Tr_BossApprove");

else

ti.end("Tr_BossNotApprove");

return;

}

}

}

protected void userCancel(){

System.out.println("==MyRequestProcessTest.userCancel()==");

/**

* 如果后台使用数据库的话,就可以使用

* org.jbpm.db.TaskMgmtSession.findTaskInstances(java.lang.String actorId) 得到所有分配给userid的taskInstance

* */

Collection coll = pi.getTaskMgmtInstance().getTaskInstances();

Iterator it = coll.iterator();

while(it.hasNext()){

TaskInstance ti = (TaskInstance)it.next();

if(ti.getName().equals("Task_CancelRequest")){

assertEquals(this.userId,ti.getActorId());

ti.end();

return;

}

}

}

protected void checkTasks(){

System.out.println("==MyRequestProcessTest.checkTasks()==");

Collection coll = pi.getTaskMgmtInstance().getTaskInstances();

Iterator it = coll.iterator();

System.out.println("====Process has task:====");

while(it.hasNext()){

TaskInstance ti = (TaskInstance)it.next();

System.out.println("=="+ti.getName()+"==");

System.out.println("=="+ti.getActorId()+"==");

System.out.println("=="+ti.getVariables().toString() +"==");

}

System.out.println("====end====");

}

}

6.2. ApproveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class ApproveActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

System.out.println("==ApproveActionHandler.execute()==");

String user =(String)executionContext.getContextInstance().getVariable(RequestVariable.userId);

int dayCount = ((Integer)executionContext.getContextInstance().getVariable(RequestVariable.dayCount)).intValue();

/**

* 发送邮件给申请人user,告知其请假被批准。

*

* */

System.out.println("==发送邮件给"+user+",告知其"+dayCount+"天的请假申请,已经被批准。==");

}

}

6.3. BossApproveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class BossApproveActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

executionContext.getContextInstance().setVariable(RequestVariable.requestState,RequestState.APPROVE );

System.out.println("==BossApproveActionHandler.execute()==");

}

}

6.4. BossNotApproveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class BossNotApproveActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

executionContext.getContextInstance().setVariable(RequestVariable.requestState,RequestState.DISAPPROVE );

System.out.println("==BossNotApproveActionHandler.execute()==");

}

}

6.5. CancelActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.RequestVariable;

import com.myrequest.*;

public class CancelActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

System.out.println("==CancelActionHandler.execute()==");

String user =(String)executionContext.getContextInstance().getVariable(RequestVariable.userId);

//如果取消的时候,部门主管已经批准过,那么需要给部门主管发送邮件,通知其请假已经取消

if(executionContext.getContextInstance().hasVariable(RequestVariable.isChiefHere) && ((Boolean)executionContext.getContextInstance().getVariable(RequestVariable.isChiefHere)).booleanValue()){

int dayCount = ((Integer)executionContext.getContextInstance().getVariable(RequestVariable.dayCount)).intValue();

//通过user找到对应的chief

/**

* 发送邮件给chief,告知其请假被批准。

*

* */

System.out.println("==发送邮件给部门主管,告知其部门员工"+user+"的"+dayCount+"天请假申请,已经取消。==");

}

}

}

6.6. ChiefApproveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.RequestState;

import com.myrequest.RequestVariable;

import com.myrequest.*;

public class ChiefApproveActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

executionContext.getContextInstance().setVariable(RequestVariable.requestState,RequestState.CHIEFAPPROVE );

System.out.println("==ChiefApproveActionHandler.execute()==");

}

}

6.7. ChiefNotApproveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class ChiefNotApproveActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

executionContext.getContextInstance().setVariable(RequestVariable.requestState,RequestState.DISAPPROVE );

System.out.println("==ChiefNotApproveActionHandler.execute()==");

}

}

6.8. FinishedActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class FinishedActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

System.out.println("==FinishedActionHandler.execute()==");

String user = (String)executionContext.getContextInstance().getVariable( RequestVariable.userId);

Integer dayCount = (Integer)executionContext.getContextInstance().getVariable( RequestVariable.dayCount);

String requestState = (String)executionContext.getContextInstance().getVariable( RequestVariable.requestState);

/**

* 将上述信息进行记录,保存每一次员工请假的信息,无论是否批准还是取消请求

*

* */

System.out.print("==在系统中记录:"+user+",申请请假"+dayCount+"天,");

if(requestState.compareTo(RequestState.APPROVE)==0)

System.out.print("被批准。");

else if(requestState.compareTo(RequestState.DISAPPROVE)==0)

System.out.print("未被批准。");

else if(requestState.compareTo(RequestState.CANCLE)==0)

System.out.print("已取消。");

else{

System.out.println("");

System.out.println("====系统出现问题,最终申请状态为:"+requestState+"====");

System.out.println("");

}

System.out.println("==");

}

}

6.9. NotApproveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.RequestVariable;

public class NotApproveActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

System.out.println("==NotApproveActionHandler.execute()==");

String user =(String)executionContext.getContextInstance().getVariable(RequestVariable.userId);

int dayCount = ((Integer)executionContext.getContextInstance().getVariable(RequestVariable.dayCount)).intValue();

/**

* 发送邮件给申请人user,告知其请假没有被批准。

*

* */

System.out.println("==发送邮件给"+user+",告知其"+dayCount+"天的请假申请,没有被批准。==");

}

}

6.10. NotNeedActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class NotNeedActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

executionContext.getContextInstance().setVariable(RequestVariable.requestState,RequestState.APPROVE );

System.out.println("==NotNeedActionHandler.execute()==");

}

}

6.11. RequestCancelActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.*;

public class RequestCancelActionHandler implements ActionHandler {

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

String requestState = (String)executionContext.getContextInstance().getVariable(RequestVariable.requestState);

//只有两种状态下允许撤销

if(requestState.compareTo(RequestState.REQEUST)==0 || requestState.compareTo(RequestState.CHIEFAPPROVE)==0 ){

//如果撤销请求的时候,请求状态为“部门主管批准”状态

if(requestState.compareTo(RequestState.CHIEFAPPROVE)==0){

executionContext.getContextInstance().createVariable(RequestVariable.isChiefHere,new Boolean(true));

}

executionContext.getContextInstance().setVariable(RequestVariable.requestState,RequestState.CANCLE );

}

else{

System.out.println("==can't canel request==");

}

System.out.println("==RequestCancelActionHandler.execute()==");

}

}

6.12. WriteLeaveActionHandler

package com.myrequest.action;

import org.jbpm.graph.def.ActionHandler;

import org.jbpm.graph.exe.ExecutionContext;

import com.myrequest.RequestState;

import com.myrequest.RequestVariable;

import com.myrequest.*;

public class WriteLeaveActionHandler implements ActionHandler {

/**

* 设置请假状态为请求

* */

public void execute(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

//设置请求状态为请求

executionContext.getContextInstance().createVariable(RequestVariable.requestState,RequestState.REQEUST);

System.out.println("==RequestBeginActionHandler.execute()==");

}

}

6.13. DoSomethingDecisionHandler

package com.myrequest.decision;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.graph.node.DecisionHandler;

import com.myrequest.*;

public class DoSomethingDecisionHandler implements DecisionHandler {

public String decide(ExecutionContext executionContext) throws Exception {

String requestState = (String)executionContext.getContextInstance().getVariable(RequestVariable.requestState);

if(requestState.compareTo(RequestState.APPROVE)==0){

return "Tr_Approve";

}

else if(requestState.compareTo(RequestState.DISAPPROVE)==0){

return "Tr_NotApprove";

}

else if(requestState.compareTo(RequestState.CANCLE)==0){

return "Tr_Cancel";

}

else{

System.out.println("==状态不对==");

throw new Exception("到达的状态不对,为:"+requestState);

}

}

}

6.14. IsChiefHereDecisionHandler

package com.myrequest.decision;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.graph.node.DecisionHandler;

import com.myrequest.RequestVariable;

public class IsChiefHereDecisionHandler implements DecisionHandler {

public String decide(ExecutionContext executionContext) throws Exception {

/**

* 根据主管是否休假来判断走哪条边

* */

System.out.println("==IsChiefHereDecisionHandler.decide()==");

//主管在

if(((Boolean)executionContext.getContextInstance().getVariable(RequestVariable.isChiefHere)).booleanValue())

return "Tr_Chief";

else

return "Tr_Boss";

}

}

6.15. NeedBossDecideDecisionHandler

package com.myrequest.decision;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.graph.node.DecisionHandler;

import com.myrequest.*;

public class NeedBossDecideDecisionHandler implements DecisionHandler {

public String decide(ExecutionContext executionContext) throws Exception {

// TODO Auto-generated method stub

int dayCount =((Integer)executionContext.getContextInstance().getVariable(RequestVariable.dayCount)).intValue();

int dayLevel= 10;//是否需要boss批准的分界

if(dayCount>=dayLevel){

return "Tr_Need";

}

else{

return "Tr_NotNeed";

}

}

}

6.16. BossDecideAssignmentHandler

package com.myrequest.task;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.taskmgmt.def.AssignmentHandler;

import org.jbpm.taskmgmt.exe.Assignable;

public class BossDecideAssignmentHandler implements AssignmentHandler {

public void assign(Assignable assignable, ExecutionContext executionContext)

throws Exception {

// TODO Auto-generated method stub

/**

* 以角色boss到数据库中查找,找到userid elena

* */

String bossId="elena";

//elena is boss

assignable.setActorId(bossId);

}

}

6.17. CancelRequestAssignmentHandler

package com.myrequest.task;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.taskmgmt.def.AssignmentHandler;

import org.jbpm.taskmgmt.exe.Assignable;

import com.myrequest.*;

public class CancelRequestAssignmentHandler implements AssignmentHandler {

public void assign(Assignable assignable, ExecutionContext executionContext)

throws Exception {

// TODO Auto-generated method stub

String userid=(String)executionContext.getContextInstance() .getVariable(RequestVariable.userId);

/**

* 撤销请假请求任务可以由请假发起人执行,demo里面是dust

* */

assignable.setActorId(userid);

System.out.println("==assign user is:"+userid+" ==");

System.out.println("==CancelRequestAssignmentHandler.assign()==");

}

}

6.18. ChiefDecideAssignmentHandler

package com.myrequest.task;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.taskmgmt.def.AssignmentHandler;

import org.jbpm.taskmgmt.exe.Assignable;

import com.myrequest.*;

public class ChiefDecideAssignmentHandler implements AssignmentHandler {

public void assign(Assignable assignable, ExecutionContext executionContext)

throws Exception {

// TODO Auto-generated method stub

String userid=(String)executionContext.getContextInstance().getVariable( RequestVariable.userId);

/**

* 通过userid得到user的上级chief是谁,这里假设是today123

* */

String chiefId ="today123";

assignable.setActorId(chiefId);

System.out.println("==assign user is:"+userid+" ==");

System.out.println("==ChiefDecideAssignmentHandler.assign()==");

}

}

6.19. WriteRequestAssignmentHandler

package com.myrequest.task;

import com.myrequest.*;

import org.jbpm.graph.exe.ExecutionContext;

import org.jbpm.taskmgmt.def.AssignmentHandler;

import org.jbpm.taskmgmt.exe.Assignable;

public class WriteRequestAssignmentHandler implements AssignmentHandler {

public void assign(Assignable assignable, ExecutionContext executionContext)

throws Exception {

// TODO Auto-generated method stub

String userid =(String)executionContext.getContextInstance().getVariable(RequestVariable.userId);

assignable.setActorId(userid);

System.out.println("==assign user is:"+userid+" ==");

System.out.println("==WriteRequestAssignmentHandler.assign()==");

}

}

6.20. RequestState

package com.myrequest;

public interface RequestState {

final static String REQEUST="request";

final static String APPROVE="approve";

final static String DISAPPROVE="disapprove";

final static String CANCLE="cancel";

final static String CHIEFAPPROVE="chiefapprove";

}

6.21. RequestVariable

package com.myrequest;

public interface RequestVariable {

//请求状态

final static String requestState="RequestState";

//主管是否在岗

final static String isChiefHere="isChiefHere";

//要请假的日期天数

final static String dayCount = "dayCount";

//启动流程,也就是要申请请假的工人的id

final static String userId ="userId";

//部门主管是否同意

final static String isChiefApprove="isChiefApprove";

}

6.22. Processdefinition.xml

<?xml version="1.0" encoding="UTF-8"?>

<process-definition

xmlns="urn:jbpm.org:jpdl-3.1" name="MyRequest">

<start-state name="SS_Request">

<transition name="" to="TN_WriteRequest"></transition>

</start-state>

<task-node name="TN_WriteRequest">

<task name="Task_WriteRequest">

<controller>

<variable name="dayCount" access="read,write,required"></variable>

</controller>

<assignment class="com.myrequest.task.WriteRequestAssignmentHandler"></assignment>

</task>

<transition name="Tr_WriteLeave" to="Fork_request">

<action name="Ac_WriteLeave" class="com.myrequest.action.WriteLeaveActionHandler"></action>

</transition>

</task-node>

<fork name="Fork_request">

<transition name="Tr_Cancel" to="TN_RequesterCancel"></transition>

<transition name="Tr_Request" to="Deci_IsChiefHere"></transition>

</fork>

<decision name="Deci_IsChiefHere">

<handler class="com.myrequest.decision.IsChiefHereDecisionHandler"/>

<transition name="Tr_Chief" to="TN_ChiefDecide"></transition>

<transition name="Tr_Boss" to="TN_BossDecide"></transition>

</decision>

<task-node name="TN_RequesterCancel">

<task name="Task_CancelRequest">

<assignment class="com.myrequest.task.CancelRequestAssignmentHandler"></assignment>

</task>

<transition name="Tr_RequestCancel" to="Join_Request">

<action name="Ac_RequestCancel" class="com.myrequest.action.RequestCancelActionHandler"></action>

</transition>

</task-node>

<task-node name="TN_ChiefDecide">

<task name="Task_ChiefDecide">

<assignment class="com.myrequest.task.ChiefDecideAssignmentHandler"></assignment>

</task>

<transition name="Tr_ChiefApprove" to="Deci_NeedBossDecide">

<action name="Ac_ChiefApprove" class="com.myrequest.action.ChiefApproveActionHandler"></action>

</transition>

<transition name="Tr_ChiefNotApprove" to="Join_Request">

<action name="Ac_ChiefNotApprove" class="com.myrequest.action.ChiefNotApproveActionHandler"></action>

</transition>

</task-node>

<join name="Join_Request">

<transition name="Tr_Join" to="Deci_DoSomething"></transition>

</join>

<decision name="Deci_NeedBossDecide">

<handler class="com.myrequest.decision.NeedBossDecideDecisionHandler"/>

<transition name="Tr_Need" to="TN_BossDecide"></transition>

<transition name="Tr_NotNeed" to="Join_Request">

<action name="Ac_NotNeed" class="com.myrequest.action.NotNeedActionHandler"></action>

</transition>

</decision>

<task-node name="TN_BossDecide">

<task name="Task_BossDecide">

<assignment class="com.myrequest.task.BossDecideAssignmentHandler"></assignment>

</task>

<transition name="Tr_BossApprove" to="Join_Request">

<action name="Ac_BossApprove" class="com.myrequest.action.BossApproveActionHandler"></action>

</transition>

<transition name="Tr_BossNotApprove" to="Join_Request">

<action name="Ac_BossNotApprove" class="com.myrequest.action.BossNotApproveActionHandler"></action>

</transition>

</task-node>

<decision name="Deci_DoSomething">

<handler class="com.myrequest.decision.DoSomethingDecisionHandler"/>

<transition name="Tr_Approve" to="ES_Finished">

<action name="Ac_Approve" class="com.myrequest.action.ApproveActionHandler"></action>

</transition>

<transition name="Tr_NotApprove" to="ES_Finished">

<action name="Ac_NotApprove" class="com.myrequest.action.NotApproveActionHandler"></action>

</transition>

<transition name="Tr_Cancel" to="ES_Finished">

<action name="Ac_Cancel" class="com.myrequest.action.CancelActionHandler"></action>

</transition>

</decision>

<end-state name="ES_Finished">

<event type="node-enter">

<action name="Ac_Finished" class="com.myrequest.action.FinishedActionHandler"></action>

</event>

</end-state>

</process-definition>

6.23. gpd.xml

<?xml version="1.0" encoding="UTF-8"?>

<process-diagram name="MyRequest" width="804" height="613">

<node name="SS_Request" x="147" y="5" width="140" height="40">

<transition name="">

<label x="5" y="-10"/>

</transition>

</node>

<node name="TN_WriteRequest" x="145" y="71" width="140" height="40">

<transition name="Tr_WriteLeave">

<label x="5" y="-10"/>

</transition>

</node>

<node name="Fork_request" x="168" y="134" width="200" height="25">

<transition name="Tr_Cancel">

<label x="5" y="-10"/>

</transition>

<transition name="Tr_Request">

<label x="5" y="-10"/>

</transition>

</node>

<node name="Deci_IsChiefHere" x="311" y="179" width="140" height="40">

<transition name="Tr_Chief">

<label x="5" y="-10"/>

</transition>

<transition name="Tr_Boss">

<label x="5" y="-10"/>

</transition>

</node>

<node name="TN_RequesterCancel" x="9" y="181" width="140" height="40">

<transition name="Tr_RequestCancel">

<label x="-73" y="-5"/>

</transition>

</node>

<node name="TN_ChiefDecide" x="159" y="253" width="140" height="40">

<transition name="Tr_ChiefApprove">

<label x="-42" y="-9"/>

</transition>

<transition name="Tr_ChiefNotApprove">

<label x="-28" y="-5"/>

</transition>

</node>

<node name="Join_Request" x="115" y="388" width="200" height="25">

<transition name="Tr_Join">

<label x="5" y="-10"/>

</transition>

</node>

<node name="Deci_NeedBossDecide" x="415" y="243" width="166" height="40">

<transition name="Tr_Need">

<label x="-30" y="-11"/>

</transition>

<transition name="Tr_NotNeed">

<label x="5" y="-10"/>

</transition>

</node>

<node name="TN_BossDecide" x="663" y="241" width="140" height="40">

<transition name="Tr_BossApprove">

<label x="31" y="-13"/>

</transition>

<transition name="Tr_BossNotApprove">

<label x="-19" y="4"/>

</transition>

</node>

<node name="Deci_DoSomething" x="146" y="460" width="140" height="40">

<transition name="Tr_Approve">

<label x="5" y="-10"/>

</transition>

<transition name="Tr_NotApprove">

<label x="2" y="5"/>

</transition>

<transition name="Tr_Cancel">

<label x="4" y="-25"/>

</transition>

</node>

<node name="ES_Finished" x="147" y="572" width="140" height="40"/>

</process-diagram>

 

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