在发生可流动异常后，流动不会继续

时间：2020-01-14 18:13:49

标签： java spring-boot bpmn flowable

鉴于以下流程，在以基数= 5并行执行“ simpleLog”（异步）服务任务时，我们遇到了并发问题，此后，流程不再继续执行“虚拟”（专有）服务任务。下一步也不要在“ simpleLog”中重试该作业。相反，我们得到4 FlowableOptimisticLockingException。 详细来说，“ simpleLog”仅打印一些硬编码的字符串，休眠3秒（以模拟真实任务），并显示另一个硬编码的字符串。 “虚拟”显示另一个文本，“ finalLog”显示所有全局变量。 这有什么问题吗？应该在FlowableOptimisticLockingException之后重试flowable 3次，如我们在这里阅读的：https://flowable.com/open-source/docs/bpmn/ch07b-BPMN-Constructs/#fail-retry吗？为什么流程不继续？

我们试图测试它是否像此处注释的那样工作：如何使一个多实例任务并行执行？但是我们没有成功。

enter image description here 

<?xml version="1.0" encoding="UTF-8"?>
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    <startEvent id="startEvent1" flowable:formFieldValidation="true"></startEvent>
    <serviceTask id="first" name="first" flowable:class="ar.com.telecom.st.pltesting.orquestador.delegates.loop.First"></serviceTask>
    <serviceTask id="finalLog" name="finalLog" flowable:class="ar.com.telecom.st.pltesting.orquestador.delegates.loop.Log"></serviceTask>
    <sequenceFlow id="sid-B08D33F0-4802-4AF7-AC57-826CCFC59F02" sourceRef="startEvent1" targetRef="first"></sequenceFlow>
    <endEvent id="sid-0E47B37E-2BDD-4DC5-82F5-91A35E90F0FC"></endEvent>
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    <subProcess id="sid-5819B32A-B13B-49D8-97A6-D409A81AFB64" name="subProcess">
      <serviceTask id="simpleLog" name="simpleLog" flowable:async="true" flowable:exclusive="false" flowable:class="ar.com.telecom.st.pltesting.orquestador.delegates.loop.LogThread">
        <multiInstanceLoopCharacteristics isSequential="false">
          <loopCardinality>5</loopCardinality>
        </multiInstanceLoopCharacteristics>
      </serviceTask>
      <serviceTask id="dummy" name="dummy" flowable:class="ar.com.telecom.st.pltesting.orquestador.delegates.loop.Dummy"></serviceTask>
      <startEvent id="sid-1F707CB9-593C-4135-8C53-A2E1EF5ECFD3" flowable:formFieldValidation="true"></startEvent>
      <endEvent id="sid-AE499CE0-482D-4B2F-A2BC-3CEEC24AD8B9"></endEvent>
      <sequenceFlow id="sid-86F155DC-5098-4803-A774-2E0E519671E0" sourceRef="dummy" targetRef="sid-AE499CE0-482D-4B2F-A2BC-3CEEC24AD8B9"></sequenceFlow>
      <sequenceFlow id="sid-0E862BB9-F8B5-4C4D-9DF8-EFDAC049FB51" sourceRef="sid-1F707CB9-593C-4135-8C53-A2E1EF5ECFD3" targetRef="simpleLog"></sequenceFlow>
      <sequenceFlow id="sid-5B2902A3-8F34-4044-8760-2586187F50AF" sourceRef="simpleLog" targetRef="dummy"></sequenceFlow>
    </subProcess>
    <sequenceFlow id="sid-5FE1F875-3C70-4C44-9593-013C0CF96C82" sourceRef="finalLog" targetRef="sid-0E47B37E-2BDD-4DC5-82F5-91A35E90F0FC"></sequenceFlow>
    <sequenceFlow id="sid-F442D23D-60F5-419F-8131-AB1E780BE326" sourceRef="first" targetRef="sid-5819B32A-B13B-49D8-97A6-D409A81AFB64"></sequenceFlow>
  </process>
  <bpmndi:BPMNDiagram id="BPMNDiagram_parallelServicetask">
    <bpmndi:BPMNPlane bpmnElement="parallelServicetask" id="BPMNPlane_parallelServicetask">
      <bpmndi:BPMNShape bpmnElement="startEvent1" id="BPMNShape_startEvent1">
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      </bpmndi:BPMNShape>
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        <omgdc:Bounds height="80.0" width="100.0" x="28.225147766400113" y="420.01594128181614"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="finalLog" id="BPMNShape_finalLog">
        <omgdc:Bounds height="80.0" width="100.0" x="1044.330467356804" y="420.01594128181614"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-0E47B37E-2BDD-4DC5-82F5-91A35E90F0FC" id="BPMNShape_sid-0E47B37E-2BDD-4DC5-82F5-91A35E90F0FC">
        <omgdc:Bounds height="28.0" width="28.0" x="1080.330467356804" y="620.9532508608023"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-5819B32A-B13B-49D8-97A6-D409A81AFB64" id="BPMNShape_sid-5819B32A-B13B-49D8-97A6-D409A81AFB64">
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      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="simpleLog" id="BPMNShape_simpleLog">
        <omgdc:Bounds height="80.0" width="100.00000000000006" x="420.0" y="420.0"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="dummy" id="BPMNShape_dummy">
        <omgdc:Bounds height="80.0" width="100.0" x="660.0" y="420.01594128181614"></omgdc:Bounds>
      </bpmndi:BPMNShape>
      <bpmndi:BPMNShape bpmnElement="sid-1F707CB9-593C-4135-8C53-A2E1EF5ECFD3" id="BPMNShape_sid-1F707CB9-593C-4135-8C53-A2E1EF5ECFD3">
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      </bpmndi:BPMNShape>
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    </bpmndi:BPMNPlane>
  </bpmndi:BPMNDiagram>
</definitions>

1 个答案:

答案 0 :(得分：0)

查看配置simpleLog服务任务

<serviceTask id="simpleLog" name="simpleLog" flowable:async="true" flowable:exclusive="false" flowable:class="ar.com.telecom.st.pltesting.orquestador.delegates.loop.LogThread">
    <multiInstanceLoopCharacteristics isSequential="false">
        <loopCardinality>5</loopCardinality>
    </multiInstanceLoopCharacteristics>
</serviceTask>

它具有flowable:exclusive="false"，这意味着所有（5）个服务任务将并行运行。完成逻辑后，所有这些将继续并尝试合并多实例。合并发生时，所有线程将尝试更新同一实体。其中只有一个会成功，而您将有4个FlowableOptimisticLockingException（一个会成功）。

此后，4会再次尝试导致3引发异常，然后3会再次尝试导致2引发异常并最终导致死锁（我认为这是对您的影响）。

目前唯一避免此问题的方法是使用flowable:exclusive="true"，它不是真正并行的，因为在任何给定时间仅执行一个服务任务。

我建议您在Flowable issue tracker中打开一个与此问题有关的问题。在这种情况下，我们可以做一些潜在的改进，使您的作业真正并行运行，但随后将活动合并到另一个异步独占作业中。

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