Activiti作业执行器问题与异步serviceTasks (activiti >= 5.17)

Question

请考虑以下图表

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MyProcess.bpmn

<?xml version="1.0" encoding="UTF-8"?>
<definitions xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:activiti="http://activiti.org/bpmn" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:omgdc="http://www.omg.org/spec/DD/20100524/DC" xmlns:omgdi="http://www.omg.org/spec/DD/20100524/DI" typeLanguage="http://www.w3.org/2001/XMLSchema" expressionLanguage="http://www.w3.org/1999/XPath" targetNamespace="http://www.activiti.org/test">
  <process id="myProcess" name="My process" isExecutable="true">
    <startEvent id="startevent1" name="Start"></startEvent>
    <userTask id="evl" name="Evaluation"></userTask>
    <boundaryEvent id="timer_event_autocomplete" name="Timer" attachedToRef="evl" cancelActivity="false">
      <timerEventDefinition>
        <timeDate>PT2S</timeDate>
      </timerEventDefinition>
    </boundaryEvent>
    <serviceTask id="timer_service" name="Timed Autocomplete" activiti:async="true" activiti:class="com.example.service.TimerService"></serviceTask>
    <serviceTask id="store_docs_service" name="Store Documents" activiti:async="true" activiti:class="com.example.service.StoreDocsService"></serviceTask>
    <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="evl"></sequenceFlow>
    <sequenceFlow id="flow2" sourceRef="timer_event_autocomplete" targetRef="timer_service"></sequenceFlow>
    <sequenceFlow id="flow3" sourceRef="evl" targetRef="store_docs_service"></sequenceFlow>
    <sequenceFlow id="flow4" sourceRef="store_docs_service" targetRef="endevent1"></sequenceFlow>
    <endEvent id="endevent1" name="End"></endEvent>
  </process>

</definitions>

要用文字描述它，有一个用户任务(评估)和一个附加计时器(配置为在2秒内触发)。在触发定时器时，时间自动完成异步服务任务在其Java TimerService中尝试完成用户任务(评估)。完成用户任务(评估)后，流移动到另一个异步服务任务(Store文档)，它调用它的Java、StoreDocsService和流结束。

TimerService.java

public class TimerService implements JavaDelegate {
    Logger LOGGER = LoggerFactory.getLogger(TimerService.class);

    @Override
    public void execute(DelegateExecution execution) throws Exception {
        LOGGER.info("*** Executing Timer autocomplete ***");
        Task task = execution.getEngineServices().getTaskService().createTaskQuery().active().singleResult();
        execution.getEngineServices().getTaskService().complete(task.getId());
        LOGGER.info("*** Task: {} autocompleted by timer ***", task.getId());
    }
}

StoreDocsService.java

public class StoreDocsService implements JavaDelegate {
    Logger LOGGER = LoggerFactory.getLogger(StoreDocsService.class);

    @Override
    public void execute(DelegateExecution execution) throws Exception {
        LOGGER.info("*** Executing Store Documents ***");
    }
}

App.java

public class App
{
    public static void main( String[] args ) throws Exception
    {

//        DefaultAsyncJobExecutor demoAsyncJobExecutor = new DefaultAsyncJobExecutor();
//        demoAsyncJobExecutor.setCorePoolSize(10);
//        demoAsyncJobExecutor.setMaxPoolSize(50);
//        demoAsyncJobExecutor.setKeepAliveTime(10000);
//        demoAsyncJobExecutor.setMaxAsyncJobsDuePerAcquisition(50);

        ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
                .setJdbcUrl("jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000")
                .setJdbcUsername("sa")
                .setJdbcPassword("")
                .setJdbcDriver("org.h2.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE)
//                .setAsyncExecutorActivate(true)
//                .setAsyncExecutorEnabled(true)
//                .setAsyncExecutor(demoAsyncJobExecutor)
                .setJobExecutorActivate(true)
                ;
        ProcessEngine processEngine = cfg.buildProcessEngine();
        String pName = processEngine.getName();
        String ver = ProcessEngine.VERSION;
        System.out.println("ProcessEngine [" + pName + "] Version: [" + ver + "]");

        RepositoryService repositoryService = processEngine.getRepositoryService();
        Deployment deployment = repositoryService.createDeployment()
                .addClasspathResource("MyProcess.bpmn").deploy();
        ProcessDefinition processDefinition = repositoryService.createProcessDefinitionQuery()
                .deploymentId(deployment.getId()).singleResult();
        System.out.println(
                "Found process definition ["
                        + processDefinition.getName() + "] with id ["
                        + processDefinition.getId() + "]");

        final Map<String, Object> variables = new HashMap<String, Object>();
        final RuntimeService runtimeService = processEngine.getRuntimeService();

        ProcessInstance id = runtimeService.startProcessInstanceByKey("myProcess", variables);
        System.out.println("Started Process Id: "+id.getId());
        try {
            final TaskService taskService = processEngine.getTaskService();
//            List<Task> tasks = taskService.createTaskQuery().active().list();
//            while (!tasks.isEmpty()) {
//                Task task = tasks.get(0);
//                taskService.complete(task.getId());
//                tasks = taskService.createTaskQuery().active().list();
//            }

        } catch (Exception e) {
            System.out.println(e.getMessage());
        } finally {

        }

        while(!runtimeService.createExecutionQuery().list().isEmpty()) {
        }
        processEngine.close();
    }


}

Activiti 5.15

当计时器触发时，上述关系图将按描述执行。我们使用Activiti的DefaultJobExecutor，正如我们在日志中看到的那样：

[main] INFO  org.activiti.engine.impl.ProcessEngineImpl  - ProcessEngine default created
[main] INFO  org.activiti.engine.impl.jobexecutor.JobExecutor  - Starting up the JobExecutor[org.activiti.engine.impl.jobexecutor.DefaultJobExecutor].
[Thread-1] INFO  org.activiti.engine.impl.jobexecutor.AcquireJobsRunnable  - JobExecutor[org.activiti.engine.impl.jobexecutor.DefaultJobExecutor] starting to acquire jobs
ProcessEngine [default] Version: [5.15]
[main] INFO  org.activiti.engine.impl.bpmn.deployer.BpmnDeployer  - Processing resource MyProcess.bpmn
Found process definition [My process] with id [myProcess:1:3]
Started Process Id: 4
[pool-1-thread-1] INFO  com.example.service.TimerService  - *** Executing Timer autocomplete ***
[pool-1-thread-1] INFO  com.example.service.TimerService  - *** Task: 9 autocompleted by timer ***
[pool-1-thread-1] INFO  com.example.service.StoreDocsService  - *** Executing Store Documents ***
[main] INFO  org.activiti.engine.impl.jobexecutor.JobExecutor  - Shutting down the JobExecutor[org.activiti.engine.impl.jobexecutor.DefaultJobExecutor].
[Thread-1] INFO  org.activiti.engine.impl.jobexecutor.AcquireJobsRunnable  - JobExecutor[org.activiti.engine.impl.jobexecutor.DefaultJobExecutor] stopped job acquisition

Activiti >= 5.17只将pom.xml中的activiti版本更改为5.17.0或更高(测试到5.22.0)并执行相同的代码，流程执行计时器的Java TimerService，它完成了用户任务(评估)，但是存储文档Java，StoreDocsService从未被调用。要添加更多内容，流似乎永远不会结束，执行仍然停留在Store Documents异步服务任务上。

日志：

[main] INFO  org.activiti.engine.impl.ProcessEngineImpl  - ProcessEngine default created
[main] INFO  org.activiti.engine.impl.jobexecutor.JobExecutor  - Starting up the JobExecutor[org.activiti.engine.impl.jobexecutor.DefaultJobExecutor].
[Thread-1] INFO  org.activiti.engine.impl.jobexecutor.AcquireJobsRunnableImpl  - JobExecutor[org.activiti.engine.impl.jobexecutor.DefaultJobExecutor] starting to acquire jobs
ProcessEngine [default] Version: [5.17.0.2]
[main] INFO  org.activiti.engine.impl.bpmn.deployer.BpmnDeployer  - Processing resource MyProcess.bpmn
Found process definition [My process] with id [myProcess:1:3]
Started Process Id: 4
[pool-1-thread-2] INFO  com.example.service.TimerService  - *** Executing Timer autocomplete ***
[pool-1-thread-2] INFO  com.example.service.TimerService  - *** Task: 9 autocompleted by timer ***

• 更改为异步作业执行器。5.17版本的一个特性是新的异步作业执行器(但是默认的非异步执行器仍然配置为默认值)。因此，尝试通过以下行启用App.java中的异步执行器：

        DefaultAsyncJobExecutor demoAsyncJobExecutor = new DefaultAsyncJobExecutor();
        demoAsyncJobExecutor.setCorePoolSize(10);
        demoAsyncJobExecutor.setMaxPoolSize(50);
        demoAsyncJobExecutor.setKeepAliveTime(10000);
        demoAsyncJobExecutor.setMaxAsyncJobsDuePerAcquisition(50);

        ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
                .setJdbcUrl("jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000")
                .setJdbcUsername("sa")
                .setJdbcPassword("")
                .setJdbcDriver("org.h2.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE)
                .setAsyncExecutorActivate(true)
                .setAsyncExecutorEnabled(true)
                .setAsyncExecutor(demoAsyncJobExecutor)
                ;

流程似乎执行正确，StoreDocsService是在TimerService之后调用的，但它永远不会结束( App.java中的while(!runtimeService.createExecutionQuery().list().isEmpty())语句始终为真)！

日志：

[main] INFO  org.activiti.engine.impl.ProcessEngineImpl  - ProcessEngine default created
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Starting up the default async job executor [org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor].
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Creating thread pool queue of size 100
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Creating executor service with corePoolSize 10, maxPoolSize 50 and keepAliveTime 10000
[Thread-1] INFO  org.activiti.engine.impl.asyncexecutor.AcquireTimerJobsRunnable  - {} starting to acquire async jobs due
[Thread-2] INFO  org.activiti.engine.impl.asyncexecutor.AcquireAsyncJobsDueRunnable  - {} starting to acquire async jobs due
ProcessEngine [default] Version: [5.17.0.2]
[main] INFO  org.activiti.engine.impl.bpmn.deployer.BpmnDeployer  - Processing resource MyProcess.bpmn
Found process definition [My process] with id [myProcess:1:3]
Started Process Id: 4
[pool-1-thread-2] INFO  com.example.service.TimerService  - *** Executing Timer autocomplete ***
[pool-1-thread-2] INFO  com.example.service.TimerService  - *** Task: 9 autocompleted by timer ***
[pool-1-thread-3] INFO  com.example.service.StoreDocsService  - *** Executing Store Documents ***

！更新！！

Activiti 6.0.0

尝试了同样的场景，但是使用了Activiti版本的6.0.0。TimerService中所需的更改，无法从DelegateExecution获取EngineServices

public class TimerService implements JavaDelegate {
    Logger LOGGER = LoggerFactory.getLogger(TimerService.class);

    @Override
    public void execute(DelegateExecution execution) {
        LOGGER.info("*** Executing Timer autocomplete ***");
        Task task = Context.getProcessEngineConfiguration().getTaskService().createTaskQuery().active().singleResult();
        Context.getProcessEngineConfiguration().getTaskService().complete(task.getId());
//        Task task = execution.getEngineServices().getTaskService().createTaskQuery().active().singleResult();
//        execution.getEngineServices().getTaskService().complete(task.getId());
        LOGGER.info("*** Task: {} autocompleted by timer ***", task.getId());
    }
}

该版本只有异步执行器，因此ProcessEngineConfiguration在App.java中更改为：

        ProcessEngineConfiguration cfg = new StandaloneProcessEngineConfiguration()
                .setJdbcUrl("jdbc:h2:mem:activiti;DB_CLOSE_DELAY=1000")
                .setJdbcUsername("sa")
                .setJdbcPassword("")
                .setJdbcDriver("org.h2.Driver")
                .setDatabaseSchemaUpdate(ProcessEngineConfiguration.DB_SCHEMA_UPDATE_TRUE)
                .setAsyncExecutorActivate(true)
//                .setAsyncExecutorEnabled(true)
//                .setAsyncExecutor(demoAsyncJobExecutor)
//                .setJobExecutorActivate(true)
                ;

使用6.0.0版本和异步执行器，我们可以在日志中看到，流程成功地完成了：

[main] INFO  org.activiti.engine.impl.ProcessEngineImpl  - ProcessEngine default created
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Starting up the default async job executor [org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor].
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Creating thread pool queue of size 100
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Creating executor service with corePoolSize 2, maxPoolSize 10 and keepAliveTime 5000
[Thread-1] INFO  org.activiti.engine.impl.asyncexecutor.AcquireAsyncJobsDueRunnable  - {} starting to acquire async jobs due
[Thread-2] INFO  org.activiti.engine.impl.asyncexecutor.AcquireTimerJobsRunnable  - {} starting to acquire async jobs due
[Thread-3] INFO  org.activiti.engine.impl.asyncexecutor.ResetExpiredJobsRunnable  - {} starting to reset expired jobs
ProcessEngine [default] Version: [6.0.0.4]
Found process definition [My process] with id [myProcess:1:3]
Started Process Id: 4
[activiti-async-job-executor-thread-2] INFO  com.example.service.TimerService  - *** Executing Timer autocomplete ***
[activiti-async-job-executor-thread-2] INFO  com.example.service.TimerService  - *** Task: 10 autocompleted by timer ***
[activiti-async-job-executor-thread-2] INFO  com.example.service.StoreDocsService  - *** Executing Store Documents ***
[main] INFO  org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor  - Shutting down the default async job executor [org.activiti.engine.impl.asyncexecutor.DefaultAsyncJobExecutor].
[activiti-reset-expired-jobs] INFO  org.activiti.engine.impl.asyncexecutor.ResetExpiredJobsRunnable  - {} stopped resetting expired jobs
[activiti-acquire-timer-jobs] INFO  org.activiti.engine.impl.asyncexecutor.AcquireTimerJobsRunnable  - {} stopped async job due acquisition
[activiti-acquire-async-jobs] INFO  org.activiti.engine.impl.asyncexecutor.AcquireAsyncJobsDueRunnable  - {} stopped async job due acquisition

Process finished with exit code 0

2个问题：

1. 我们已经从Activiti 5.15升级到了5.22.0，我们不使用异步作业执行器。是否有任何方法使这段图的功能保持在5.15
2. If中的行为，切换到异步作业执行器是不可避免的，那么，为了使这个过程完成successfully?

，我们缺少什么？

以上项目的示例可在以下网站找到：https://github.com/pleft/DemoActiviti

Answer 1

没有明确回答您的问题，这将需要设置您的环境和调试，我建议您至少搬到Activiti 6。5.x分支的Activiti已经有5年多没有维护，实际上已经死了。甚至6.x行也被放弃了，因为核心开发人员都转向了“可流动”项目。如果你选择留在Activiti 5.x，你的选择是：

project).

• Contract

• 自己维护代码库(希望对 Activiti支持服务提供任何更改/增强)。有几家供应商提供这样的服务。