Activiti7 閘道器(排他閘道器)

阿新 • • 發佈：2020-09-07

什麼是排他閘道器?

排他閘道器(也叫異或(XOR)閘道器,或叫基於資料的排他閘道器),用於在流程中實現決策,當流程執行到這個閘道器,所有分支都會判斷條件是否為true,如果為true則執行該分支

注意:排他閘道器只會選擇一個為true的分支執行.(即使有兩個分支條件都為true,排他閘道器也會只選擇一條分支去執行)

為什麼要用排他閘道器?

不用排他閘道器也能實現分支

在連線的condition條件上設定分支條件

缺點:

如果條件都不滿足,不使用排他閘道器,流程就結束了(異常結束)

如果使用排他閘道器決定分支的走向

如果從網關出去的線所有條件都不滿足則系統丟擲異常

org.activiti.engine.ActivitiException: No outgoing sequence flow of the exclusive gateway 'exclusivegateway1' could be selected for 
 continuing the process
at org.activiti.engine.impl.bpmn.behavior.ExclusiveGatewayActivityBehavior.leave(ExclusiveGatewayActivityBehavior.java:85)

說明:經過排他閘道器必須要有一條且只有一條分支走.

畫圖:

其他的都一樣就是添加了一個排他閘道器

部署->啟動->提交任務

package com.itheima.test;

import com.itheima.activiti.pojo.Holiday;
import org.activiti.engine.*;
 
import org.activiti.engine.repository.Deployment;
import org.activiti.engine.runtime.ProcessInstance;
import org.activiti.engine.task.Task;
import org.junit.Before;
import org.junit.Test;

import java.util.HashMap;
import java.util.Map;

/**
 * 閘道器測試
 */
public class ActivitiGatewayTest {

    ProcessEngine defaultProcessEngine;

    @Before
     
public void init() {
        defaultProcessEngine = ProcessEngines.getDefaultProcessEngine();
    }

    /**
     * 部署流程定義
     */
    @Test
    public void deployment(){
        RepositoryService repositoryService = defaultProcessEngine.getRepositoryService();

        Deployment deploy = repositoryService.createDeployment()
                .addClasspathResource("pic/gateway/holidayGateway1.bpmn")
                .addClasspathResource("pic/gateway/holidayGateway1.png")
                .name("請假流程")
                .deploy();

        System.out.println(deploy);
    }

    /**
     * 啟動流程例項
     */
    @Test
    public void startProcessInstance(){

        RuntimeService runtimeService = defaultProcessEngine.getRuntimeService();

        Map<String,Object> map = new HashMap<>();

        Holiday holiday = new Holiday();
        holiday.setNum(5F);

        map.put("holiday",holiday);

        ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("myProcess_1", map);

        System.out.println(processInstance);

    }

    /**
     * 提交任務
     */
    @Test
    public void completTask(){
        String assignee = "lisi";
        Task task = querySingResultByAssignee(assignee);
        TaskService taskService = defaultProcessEngine.getTaskService();
        taskService.complete(task.getId());
    }

    /**
     * 查詢使用者唯一任務
     * @param assignee
     * @return
     */
    public Task querySingResultByAssignee(String assignee){
        TaskService taskService = defaultProcessEngine.getTaskService();
        return taskService.createTaskQuery().processDefinitionKey("myProcess_1").taskAssignee(assignee).singleResult();
    }
}