Activiti入门教程九(玩转RuntimeService流程控制API)

时间:2022-02-17 18:09:40

     Activiti提供了流程运行时对流程进行控制的API,可以使用RuntimeService提供的方法对流程进行控制,与先前博客中提到的一样,RuntimeService是Activiti提供的业务组件之一。前几篇博客中介绍的TaskService主要用于任务管理,包括任务操作,任务数据管理等;IdentityService主要用于管理流程的身份数据;RepositoryService主要用于管理流程部署的数据;而本篇博客要学习的RuntimeService主要用于管理流程在运行时产生的数据以及提供对流程进行操作的API。其中流程运行时产生的数据包括流程参数、事件、流程实例以及执行流等。


     什么是流程实例与执行流

     在Activiti中,启动了一个流程后,就会创建一个流程实例(ProcessInstance),每个流程实例至少会有一个执行流(Execution);如果流程中出现了分支,那么执行流的概念就出现了。所以一个流程实例就是一个执行流,这就是区别所在。


 

     RuntimeService中的查询操作

     执行流查询

RuntimeService中有createExecutionQuery方法可以得到一个ExecutionQuery对象,该对象就可以根据执行流的相关数据查询执行流。直接看个例子吧!从实战中学习。


<span style="font-family:Comic Sans MS;font-size:18px;">public class ExecutionQuery {


public static void main(String[] args) {
// 创建流程引擎
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// 得到流程存储服务实例
RepositoryService repositoryService = engine.getRepositoryService();
// 得到运行时服务组件
RuntimeService runtimeService = engine.getRuntimeService();
// 部署流程描述文件
repositoryService.createDeployment()
.addClasspathResource("bpmn/ExecutionQuery.bpmn").deploy();
//设置参数
Map<String, Object> vars1 = new HashMap<String, Object>();
vars1.put("days", 5);
Map<String, Object> vars2 = new HashMap<String, Object>();
vars2.put("days", 6);
Map<String, Object> vars3 = new HashMap<String, Object>();
vars3.put("days", 7);
vars3.put("name", "crazyit");
// 开始流流程
ProcessInstance pi1 = runtimeService.startProcessInstanceByKey("testProcess",
"businessKey1", vars1);
ProcessInstance pi2 = runtimeService.startProcessInstanceByKey("testProcess",
"businessKey2", vars2);
ProcessInstance pi3 = runtimeService.startProcessInstanceByKey("testProcess",
"businessKey3", vars3);
// 使用执行流查询方法
List<Execution> exes = runtimeService.createExecutionQuery()
.processDefinitionKey("testProcess").list();
System.out.println("使用processDefinitionKey方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery()
.processInstanceBusinessKey("businessKey1").list();
System.out.println("使用processInstanceBusinessKey方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery()
.messageEventSubscriptionName("messageName").list();
System.out.println("使用messageEventSubscriptionName方法查询执行流:" + exes.size());
// 根据节点id属性查询当前的执行流
Execution exe = runtimeService.createExecutionQuery()
.activityId("messageintermediatecatchevent1")
.processInstanceId(pi1.getId()).singleResult();
System.out.println("使用activityId和processInstanceId方法查询执行流,得到执行ID:" + exe.getId());
//让流程往下执行
runtimeService.messageEventReceived("messageName", exe.getId());
exes = runtimeService.createExecutionQuery().signalEventSubscriptionName("signalName").list();
System.out.println("使用signalEventSubscriptionName方法查询执行流:" + exes.size());
// 根据参数查询执行流
exes = runtimeService.createExecutionQuery().variableValueEquals("name", "crazyit").list();
System.out.println("使用variableValueEquals方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery().variableValueGreaterThan("days", 5).list();
System.out.println("使用variableValueGreaterThan方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery().variableValueGreaterThanOrEqual("days", 5).list();
System.out.println("使用variableValueGreaterThanOrEqual方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery().variableValueLessThan("days", 6).list();
System.out.println("使用variableValueLessThan方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery().variableValueLessThanOrEqual("days", 6).list();
System.out.println("使用variableValueLessThanOrEqual方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery().variableValueLike("name", "%crazy%").list();
System.out.println("使用variableValueLike方法查询执行流:" + exes.size());
exes = runtimeService.createExecutionQuery().variableValueNotEquals("days", 8).list();
System.out.println("使用variableValueNotEquals方法查询执行流:" + exes.size());
}

}</span>


 

     流程实例查询

     与上述类似,也可以通过RuntimeService的createProcessInstanceQuery方法获取ProcessInstanceQuery实例,在该实例中也为我们提供了有关流程实例的查询方法


<span style="font-family:Comic Sans MS;font-size:18px;">public class ProcessInstanceQuery {

public static void main(String[] args) {
// 创建流程引擎
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// 得到流程存储服务实例
RepositoryService repositoryService = engine.getRepositoryService();
// 得到运行时服务组件
RuntimeService runtimeService = engine.getRuntimeService();
// 部署流程描述文件
repositoryService.createDeployment()
.addClasspathResource("bpmn/ProcessInstanceQuery.bpmn")
.deploy();
ProcessInstance pi1 = runtimeService.startProcessInstanceByKey(
"testProcess", "key1");
ProcessInstance pi2 = runtimeService.startProcessInstanceByKey(
"testProcess", "key2");
ProcessInstance pi3 = runtimeService.startProcessInstanceByKey(
"testProcess", "key3");

// 将流程置为中断状态
runtimeService.suspendProcessInstanceById(pi1.getId());
// 查询流程实例
List<ProcessInstance> pis = runtimeService.createProcessInstanceQuery()
.processDefinitionKey("testProcess").list();
System.out.println("使用processDefinitionKey方法查询流程实例:" + pis.size());
pis = runtimeService.createProcessInstanceQuery().active().list();
System.out.println("使用active方法查询流程实例:" + pis.size());
pis = runtimeService.createProcessInstanceQuery()
.processInstanceBusinessKey("key2").list();
System.out
.println("使用processInstanceBusinessKey方法查询流程实例:" + pis.size());
// 根据多个流程实例ID查询
Set<String> ids = new HashSet<String>();
ids.add(pi1.getId());
ids.add(pi2.getId());
pis = runtimeService.createProcessInstanceQuery()
.processInstanceIds(ids).list();
System.out.println("使用processInstanceIds方法查询流程实例:" + pis.size());
}

}
</span>



 

     启动流程 

     RuntimeServcie中也为我们提供了很多启动流程的方法,方法统一命名为startProcessInstanceByXXX,其中XXX有流程定义ID、流程定义的key(流程描述文件中的process的id属性)和流程中定义的额message。


     startProcessInstanceById方法

 

<span style="font-family:Comic Sans MS;font-size:18px;">public class StartById {

/**
* @param args
*/
public static void main(String[] args) {
// 创建流程引擎
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// 得到流程存储服务实例
RepositoryService repositoryService = engine.getRepositoryService();
RuntimeService runtimeService = engine.getRuntimeService();
// 部署流程描述文件
Deployment dep = repositoryService.createDeployment()
.addClasspathResource("bpmn/startById.bpmn20.xml").deploy();
// 查找流程定义
ProcessDefinition pd = repositoryService.createProcessDefinitionQuery()
.deploymentId(dep.getId()).singleResult();
//设置流程参数
Map<String, Object> vars = new HashMap<String, Object>();
vars.put("days", 5);
//启动流程
runtimeService.startProcessInstanceById(pd.getId());
runtimeService.startProcessInstanceById(pd.getId(), vars);
runtimeService.startProcessInstanceById(pd.getId(), "vacationRequest1");
runtimeService.startProcessInstanceById(pd.getId(), "vacationRequest2", vars);
// 查询流程实例,结果为4
long count = runtimeService.createProcessInstanceQuery().count();
System.out.println("流程实例数量:" + count);
}

}
</span>


     startProcessInstanceByKey方法

<span style="font-family:Comic Sans MS;font-size:18px;">public class StartByKey {

/**
* @param args
*/
public static void main(String[] args) {
// 创建流程引擎
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// 得到流程存储服务实例
RepositoryService repositoryService = engine.getRepositoryService();
RuntimeService runtimeService = engine.getRuntimeService();
// 部署流程描述文件
repositoryService.createDeployment()
.addClasspathResource("bpmn/startByKey.bpmn20.xml").deploy();
//初始化流程参数
Map<String, Object> vars = new HashMap<String, Object>();
vars.put("days", 4);
//启动流程
runtimeService.startProcessInstanceByKey("vacationRequest");
runtimeService.startProcessInstanceByKey("vacationRequest", vars);
runtimeService.startProcessInstanceByKey("vacationRequest", "testKey");
runtimeService.startProcessInstanceByKey("vacationRequest", "testKey2", vars);
// 查询流程实例,结果为4
long count = runtimeService.createProcessInstanceQuery().count();
System.out.println("流程实例数量:" + count);
}

}
</span>




     startProcessInstanceByMessage方法

<span style="font-family:Comic Sans MS;font-size:18px;">public class StartByMessage {

/**
* @param args
*/
public static void main(String[] args) {
// 创建流程引擎
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// 得到流程存储服务实例
RepositoryService repositoryService = engine.getRepositoryService();
RuntimeService runtimeService = engine.getRuntimeService();
// 部署流程描述文件
repositoryService.createDeployment()
.addClasspathResource("bpmn/startByMessage.bpmn20.xml").deploy();
//初始化流程参数
Map<String, Object> vars = new HashMap<String, Object>();
vars.put("days", 4);
//启动流程
runtimeService.startProcessInstanceByMessage("startMsg");
runtimeService.startProcessInstanceByMessage("startMsg", vars);
runtimeService.startProcessInstanceByMessage("startMsg", "testKey");
runtimeService.startProcessInstanceByMessage("startMsg", "testKey2", vars);
// 查询流程实例,结果为4
long count = runtimeService.createProcessInstanceQuery().count();
System.out.println("流程实例数量:" + count);
}

}
</span>


     流程参数

     RuntimeService组件跟其他组件类似,也可以在流程运行的过程中来设置参数,方法与其他组件都类似,并且参数也有作用域的问题。在此就给个demo看一下吧

<span style="font-family:Comic Sans MS;font-size:18px;">public class SetVariableLocal {


public static void main(String[] args) {
// 创建流程引擎
ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
// 得到流程存储服务实例
RepositoryService repositoryService = engine.getRepositoryService();
// 得到运行时服务组件
RuntimeService runtimeService = engine.getRuntimeService();
// 得到任务
TaskService taskService = engine.getTaskService();
// 部署流程描述文件
repositoryService.createDeployment()
.addClasspathResource("bpmn/localVariable.bpmn20.xml").deploy();
//启动流程
ProcessInstance pi = runtimeService.startProcessInstanceByKey("vacationRequest");
//查询全部的任务,得到相应的执行流,设置不同的参数
List<Task> tasks = taskService.createTaskQuery().processInstanceId(pi.getId()).list();
for (Task task : tasks) {

Execution exe = runtimeService.createExecutionQuery()
.executionId(task.getExecutionId()).singleResult();
if ("Manager Audit".equals(task.getName())) {
//经理审核节点,设置Local参数
runtimeService.setVariableLocal(exe.getId(), "managerVar", "manager var");
} else {
//HR审核节点,设置全局参数
runtimeService.setVariable(exe.getId(), "hrVar", "hr var");
}
}
//两个执行流时输出参数
for (Task task : tasks) {
Execution exe = runtimeService.createExecutionQuery()
.executionId(task.getExecutionId()).singleResult();
if ("Manager Audit".equals(task.getName())) {
System.out.println("使用getVariableLocal方法获取经理参数:" +
runtimeService.getVariableLocal(exe.getId(), "managerVar"));
System.out.println("使用getVariable方法获取经理参数:" +
runtimeService.getVariableLocal(exe.getId(), "managerVar"));
} else {
System.out.println("使用getVariableLocal方法获取HR参数:" +
runtimeService.getVariableLocal(exe.getId(), "hrVar"));
System.out.println("使用getVariable方法获取HR参数:" +
runtimeService.getVariable(exe.getId(), "hrVar"));

}
}
//完成任务
for (Task task : tasks) {
taskService.complete(task.getId());
}
System.out.println("======== 完成流程分支后 ========");
//重新查找流程任务
tasks = taskService.createTaskQuery().processInstanceId(pi.getId()).list();
for (Task task : tasks) {
System.out.println("当前流程节点:" + task.getName());
Execution exe = runtimeService.createExecutionQuery()
.executionId(task.getExecutionId()).singleResult();
System.out.println("经理参数:" + runtimeService.getVariable(exe.getId(), "managerVar"));
System.out.println("HR参数:" + runtimeService.getVariable(exe.getId(), "hrVar"));
}
}

}
</span>