JBPM工作流管理例子

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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，还必须上级主管批准。如果是部门主管要休假只要上级主管批准即可。在休假被批准之前，申请人可以撤销休假申请。
每个员工还有多少天休假必须管理起来，在员工提交休假申请时要检查申请天数是否超过可用天数。申请批准后，要在可用天数里减去申请天数。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。
  processdefinition.xml如下：
<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE process-definition PUBLIC
    "-//jBpm/jBpm Mapping DTD 2.0//EN"
    "http://jbpm.org/dtd/processdefinition-2.0.dtd">
<process-definition  name="RequestLeave">
<swimlane name="requester">
  <description>申请者</description>
</swimlane>
<swimlane name="chief">
  <description>部门主管</description>
  <delegation class="kellerdu.jbpm.delegation.ChiefSwimlane"/>
</swimlane>
<swimlane name="boss">
  <description>上级主管</description>
  <delegation class="kellerdu.jbpm.delegation.BossSwimlane"/>
</swimlane>
<start-state name="request" swimlane="requester">
  <transition to="BeginRequest"/>
</start-state>
<fork name="BeginRequest">
  <transition to="RequesterCancel"/>
  <transition to="IsChief"/>
</fork>
<decision name="IsChief">
  <delegation class="kellerdu.jbpm.delegation.ChiefDecision"/>
  <transition name="BossApprove"  to="BossApprove"/>
  <transition name="ChiefApprove"  to="ChiefApprove"/>
</decision>
<state name="RequesterCancel">
  <assignment swimlane="requester"/>
  <transition name="cancel" to="Decided">
   <action>
    
    <delegation class="kellerdu.jbpm.action.RequestCancel"/>
   </action>
  </transition>
</state>
<state name="ChiefApprove">
  <assignment swimlane="chief"/>
  <transition name="approve" to="NeedBossApprove">
   <action>
    
    <delegation class="kellerdu.jbpm.action.ChiefApprove"/>
   </action>
  </transition>
  <transition name="disapprove" to="Decided">
   <action>
    
    <delegation class="kellerdu.jbpm.action.ChiefDisapprove"/>
   </action>
  </transition>
</state>
<state name="BossApprove">
  <assignment swimlane="boss"/>
  <transition name="approve" to="Decided">
   <action>
    
    <delegation class="kellerdu.jbpm.action.BossApprove"/>
   </action>
  </transition>
  <transition name="disapprove" to="Decided">
   <action>
    
    <delegation class="kellerdu.jbpm.action.BossDisapprove"/>
   </action>
  </transition>
</state>
<decision name="NeedBossApprove">
  
  <delegation class="kellerdu.jbpm.delegation.NeedBossApproveDecision"/>
  <transition name="need" to="BossApprove"/>
  <transition name="notNeed" to="Decided"/>
</decision>
<join name="Decided">
  <description>有一个先到达即进行父Token</description>
  <delegation class="kellerdu.jbpm.delegation.DecidedJoin"/>
  <transition to="DoSomething"/>
</join>
<decision name="DoSomething">
  <description>
    根据请求的状态决定。
    （1）“主管或者老板批准”－‘approve’：修改员工休假的总天数，设定发给用户E-Mail的信息。
    （2）“主管或者老板否决”-“disapprove”：设定发给用户E－Mail的信息。
    （3）“撤销”-"cancel"－设定发给用户E－Mail的信息。如果主管批准，要发给主管消息说明已经撤销。
    </description>
  <delegation class="kellerdu.jbpm.delegation.DoSomethingDecision"/>
  <transition name="disapprove" to="Finished">
   <action>
    <delegation class="kellerdu.jbpm.action.Disapprove"/>
   </action>
  </transition>
  <transition name="approve" to="Finished">
   <action>
    <delegation class="kellerdu.jbpm.action.Approve"/>
   </action>
  </transition>
  <transition name="cancel" to="Finished">
   <action>
    <delegation class="kellerdu.jbpm.action.Cancel"/>
   </action>
  </transition>
</decision>
<end-state name="Finished"/>
<action event-type="process-end">
  
  <delegation class="kellerdu.jbpm.action.ProcessEndAction"/>
</action>
</process-definition>

Action指明的是当前状态要执行的一些额外的操作，如记录log、发邮件等。
（1）Swimline的delegation要做的就是判别当前Actor的身份。
package kellerdu.jbpm.delegation;

import org.jbpm.delegation.*;
import kellerdu.jbpm.LogsFactory;
import org.apache.commons.logging.Log;

public class BossSwimlane implements AssignmentHandler {
public BossSwimlane() {
}

    /**
     * 当前的状态有哪个actor来具体负责处理，选择是老板的actor来处理。
     *
     * 如果王林是老板，那么他请假可以用他的名称来开始一个请假流程，当他检查他需要批示的
     * 请假时，使用actorId=boss来找出所有的批示。这时selectActor返回的值就是一个常量“boss”
     *
     *
     * @param assignmentContext AssignmentContext
     * @return String
     * @todo Implement this org.jbpm.delegation.AssignmentHandler method
     */
    public String selectActor(AssignmentContext assignmentContext) {
        Log log = LogsFactory.getLogInstance(this.getClass());
        log.info("任务分配给老板");
        return "boss";
    }
}
ackage kellerdu.jbpm.delegation;

import org.jbpm.delegation.*;
import kellerdu.jbpm.LogsFactory;
import org.apache.commons.logging.Log;

public class ChiefSwimlane implements AssignmentHandler {
public ChiefSwimlane() {
}

    /**
     * selectActor
     * @see BossSwimlane
     *
     * @param assignmentContext AssignmentContext
     * @return String
     * @todo Implement this org.jbpm.delegation.AssignmentHandler method
     */
    public String selectActor(AssignmentContext assignmentContext) {
       Log log = LogsFactory.getLogInstance(this.getClass());
        log.info("任务分配给上级主管");
       return "chief";
    }
}
（二）Decision
package kellerdu.jbpm.delegation;

import org.jbpm.delegation.*;
import kellerdu.jbpm.LogsFactory;
import org.apache.commons.logging.Log;
import kellerdu.jbpm.Constants;

public class ChiefDecision implements DecisionHandler {
public ChiefDecision() {
}

    /**
     * 判断是否需要主管批准，决定下一个要进行的transition
     *
     * @param executionContext ExecutionContext
     * @return String
     * @todo Implement this org.jbpm.delegation.DecisionHandler method
     */
    public String decide(ExecutionContext executionContext) {
        Log log=LogsFactory.getLogInstance(this.getClass());
        String ac=(String)executionContext.getVariable(Constants.USER_NAME);
        if(ac!=null&&(ac.equals("dali")||ac.equals("wang"))){
            log.info(ac+"需要老板批准！");
            return "BossApprove";
        }else{
            log.info(ac+"需要先经主管批准");
            return "ChiefApprove";
        }
    }
}
＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝＝
（三）fork
package kellerdu.jbpm.delegation;

import org.jbpm.*;
import org.jbpm.delegation.*;
import org.jbpm.model.execution.*;
import java.util.*;

public class DecidedJoin implements JoinHandler {
public DecidedJoin() {
}

    /**
     * fork，只要一个分支到达，即可进行下一步操作，同时取消其它同时进行的分支。
     * 这里就是用户如果取消，请假就取消。如果用户请假批准，则用户不能取消。
     *
     * @param forkContext ForkContext
     * @throws ExecutionException
     * @todo Implement this org.jbpm.delegation.ForkHandler method
     */
    public void join(JoinContext joinContext) throws ExecutionException {
        Iterator it=joinContext.getConcurrentTokens().values().iterator();
        Token arrivingToken = joinContext.getToken();
        while(it.hasNext()){
            Token to=(Token)it.next();
            if(to.getId().equals(arrivingToken.getId())){
                //取消其它执行的Token
                joinContext.getExecutionService().cancelToken(to.getId());
            }
        }
         // reactivate the parent token.
          joinContext.reactivateToken( arrivingToken.getParent() );
    }
}
（一）  开始一个请假流程
       //user是请假人的actorId
       ExecutionService es=JbpmServiceFactory.getInstance().openExecutionService(user);
        HashMap vs=new HashMap();
       //一些参数
        vs.put(Constants.REQUEST_STATUS,String.valueOf(0));
        vs.put(Constants.REQUEST_RETURN_INFO,"No info!");
        vs.put(Constants.USER_NAME,EncodeTransfer.toISO(user));
        vs.put(Constants.REQUEST_DAYS,String.valueOf(rea.getDays()));
        try {
           //开启请假流程
            es.startProcessInstance(Constants.WORK_NAME, vs);
            log.info("["+user+"]"+"申请假期开始！请假"+rea.getDays()+"天！");
            return am.findForward("main");
        } catch (ExecutionException ex) {
            ex.printStackTrace();
            log.error("请假进程无法开始！");
            return am.findForward("error");
        }finally{
            es.close();
        }
（二）当前执行任务
    对于部门经理或者老板，找到要处理的请假。
       String actorId = (String) req.getSession().getAttribute(Constants.USER);
            if(actorId.equals("wang")){
                actorId="boss";
            }else if(actorId.equals("bigli")){
                actorId="chief";
            }
            // get the execution service
            ExecutionService executionService = JbpmServiceFactory.getInstance().
                                                openExecutionService(actorId);

            // get the tasklist from jbpm for user
            List tasks = new ArrayList();
            // add the jbpm tasks
            tasks.addAll(executionService.getTaskList(actorId));
            // put the tasklist into the form
            mf.setTasks(tasks);
            // get the tasklist from jbpm for user
            List definitions = new ArrayList();
            // add the jbpm definitions
            definitions.addAll(executionService.getLatestDefinitions());
            // put the tasklist into the form
            mf.setRequests(definitions);
            // close the execution service
            executionService.close();
            req.getSession().setAttribute("mainForm",mf);
            log.debug("任务: " + tasks);
            log.debug("当前可以执行的请求: " + definitions);
（三）处理请假
           String actorId = (String) reqrest.getSession().getAttribute(Constants.
                    USER);
            Long tokenId=new Long(req.getParameter("tokenId"));
            // get the execution service
            ExecutionService executionService = JbpmServiceFactory.getInstance().
                                                openExecutionService(actorId);
            Map hm=executionService.getVariables(tokenId);//变量
            String act=req.getParameter("action");//进行转换的transition
            executionService.endOfState(tokenId,hm,act);
            executionService.close();