工作流activiti 6 学习笔记十四 多流程实例

多流程实例是指一个任务节点被执行多次，用户任务服务任务都可以。本示例展示以下四种场景：直接指定执行次数，根据参数限制执行次数，获取参数值，提前结束。

第一种：直接指定执行次数

此示例指定一个服务任务执行两次

bpmn文件

<process id="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="User Task"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow3" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
    <serviceTask id="servicetask1" name="Service Task" activiti:class="org.scf.act.api.task.multi.ServiceDelegate">
    	<multiInstanceLoopCharacteristics isSequential="false">
    		<loopCardinality>2</loopCardinality>
    	</multiInstanceLoopCharacteristics>
    </serviceTask>
    <sequenceFlow id="flow4" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
    <sequenceFlow id="flow5" sourceRef="servicetask1" targetRef="usertask1"></sequenceFlow>
  </process>

java 代码，

// 部署流程
		Deployment deploye = rs.createDeployment().addClasspathResource("multiTask.bpmn").deploy();
		
		ProcessDefinition  pdf = rs.createProcessDefinitionQuery().deploymentId(deploye.getId()).singleResult();
		
		ProcessInstance  pi = runS.startProcessInstanceById(pdf.getId());
		System.out.println(pi.getId());

运行结果

这是一个服务任务
这是一个服务任务
465005

第二种 ：根据参数限制执行次数

设定一个list，放两个值，启动流程后会根据这两个值限制执行次数

bpmn文件

<process id="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="User Task"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow3" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
    <serviceTask id="servicetask1" name="Service Task" activiti:class="org.scf.act.api.task.multi.ServiceDelegate">
    	<multiInstanceLoopCharacteristics isSequential="false">
    		<!-- <loopCardinality>2</loopCardinality> --><!-- 执行两次 -->
    		<loopDataInputRef>datas1</loopDataInputRef>
    	</multiInstanceLoopCharacteristics>
    </serviceTask>
    <sequenceFlow id="flow4" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
    <sequenceFlow id="flow5" sourceRef="servicetask1" targetRef="usertask1"></sequenceFlow>
  </process>

java代码

// 部署流程
		Deployment deploye = rs.createDeployment().addClasspathResource("multiTask.bpmn").deploy();
		
		ProcessDefinition  pdf = rs.createProcessDefinitionQuery().deploymentId(deploye.getId()).singleResult();
		
		List<String> datas1 = new ArrayList<String>();
		datas1.add("a");
		datas1.add("b");
		
		Map<String,Object> map = new HashMap<String,Object>();
		map.put("datas1", datas1);
		
		ProcessInstance  pi = runS.startProcessInstanceById(pdf.getId(),map);
		System.out.println(pi.getId());

运行结果

这是一个服务任务
这是一个服务任务
467505

第三种：获取参数值

对以上示例进行打印list值

bpmn 文件

<process id="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="User Task"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow3" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
    <serviceTask id="servicetask1" name="Service Task" activiti:class="org.scf.act.api.task.multi.ServiceDelegate">
    	<multiInstanceLoopCharacteristics isSequential="false" activiti:collection="${datas1}" activiti:elementVariable="data">
    		<!-- <loopCardinality>2</loopCardinality> --><!-- 执行两次 -->
    		<!-- <loopDataInputRef>datas1</loopDataInputRef> --><!-- 根据list个数设定执行次数 -->
    	</multiInstanceLoopCharacteristics>
    </serviceTask>
    <sequenceFlow id="flow4" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
    <sequenceFlow id="flow5" sourceRef="servicetask1" targetRef="usertask1"></sequenceFlow>
  </process>

java 代码同上

服务任务代码如下

package org.scf.act.api.task.multi;

import org.activiti.engine.delegate.DelegateExecution;
import org.activiti.engine.delegate.JavaDelegate;

public class ServiceDelegate implements JavaDelegate {

	@Override
	public void execute(DelegateExecution execution) {
		System.out.println("这是一个服务任务"+execution.getVariable("data"));
	}

}

运行结果

这是一个服务任务a
这是一个服务任务b
470005

第四种：提前结束

list 设置4个值，bpmn文件里面限定两次结束

<process id="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="usertask1" name="User Task"></userTask>
    <endEvent id="endevent1" name="End"></endEvent>
    <sequenceFlow id="flow3" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
    <serviceTask id="servicetask1" name="Service Task" activiti:class="org.scf.act.api.task.multi.ServiceDelegate">
    	<multiInstanceLoopCharacteristics isSequential="false" activiti:collection="${datas1}" activiti:elementVariable="data">
    		<!-- <loopCardinality>2</loopCardinality> --><!-- 执行两次 -->
    		<!-- <loopDataInputRef>datas1</loopDataInputRef> --><!-- 根据list个数设定执行次数 -->
    		<completionCondition>${nrOfCompletedInstances >=2 }</completionCondition>
    	</multiInstanceLoopCharacteristics>
    </serviceTask>
    <sequenceFlow id="flow4" sourceRef="startevent1" targetRef="servicetask1"></sequenceFlow>
    <sequenceFlow id="flow5" sourceRef="servicetask1" targetRef="usertask1"></sequenceFlow>
  </process>

java 代码

// 部署流程
		Deployment deploye = rs.createDeployment().addClasspathResource("multiTask.bpmn").deploy();
		
		ProcessDefinition  pdf = rs.createProcessDefinitionQuery().deploymentId(deploye.getId()).singleResult();
		
		List<String> datas1 = new ArrayList<String>();
		datas1.add("a");
		datas1.add("b");
		datas1.add("c");
		datas1.add("d");
		
		Map<String,Object> map = new HashMap<String,Object>();
		map.put("datas1", datas1);
		
		ProcessInstance  pi = runS.startProcessInstanceById(pdf.getId(),map);
		System.out.println(pi.getId());

运行结果

这是一个服务任务a
这是一个服务任务b
477505