Call activity (子流程)

BPMN2.0有了常规子流程（Sub-Process）和调用子流程（call activity）。两者都是调用子流程。不用于Sub-process，call activity调用的子流程无需嵌套在原始流程中。
当流程执行到Call Activity调用活动时，将创建一个新流程实例，当子流程执行完成后将继续执行原始流程。

流程流程图示意

主流程定义

<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/processdef">
  <process id="process_call_activiti" name="callActiviti" isExecutable="true">
    <startEvent id="sid-16DBFA1E-35E2-47E3-AFAF-474794A484EF">startEvent>
    <callActivity id="sid-A18F2859-7517-4FE3-9492-E1D554D67E08" name="子流程" calledElement="process_demo" activiti:inheritVariables="false">callActivity>
    <userTask id="sid-36AE98BA-7D81-4CCD-9361-46A4C651A227" name="主任务">userTask>
    <sequenceFlow id="sid-6DD89223-E3B4-49DF-BAD1-3BD5C635BCEA" sourceRef="sid-A18F2859-7517-4FE3-9492-E1D554D67E08" targetRef="sid-36AE98BA-7D81-4CCD-9361-46A4C651A227">sequenceFlow>
    <endEvent id="sid-7B73BC3A-08CA-47F8-B054-13B71285FEFE">endEvent>
    <sequenceFlow id="sid-BBB8A48C-463D-4D32-BA11-225756DAB95B" sourceRef="sid-36AE98BA-7D81-4CCD-9361-46A4C651A227" targetRef="sid-7B73BC3A-08CA-47F8-B054-13B71285FEFE">sequenceFlow>
    <userTask id="sid-D94522CB-6251-4DC6-877C-6B113FE73E93" name="主任务开始">userTask>
    <sequenceFlow id="sid-8FE8E385-8901-42EE-B216-13A9AA7E9EFB" sourceRef="sid-16DBFA1E-35E2-47E3-AFAF-474794A484EF" targetRef="sid-D94522CB-6251-4DC6-877C-6B113FE73E93">sequenceFlow>
    <sequenceFlow id="sid-92753CF7-25F9-4FD3-83DD-A905EDA6CFF0" sourceRef="sid-D94522CB-6251-4DC6-877C-6B113FE73E93" targetRef="sid-A18F2859-7517-4FE3-9492-E1D554D67E08">sequenceFlow>
  process>
definitions>
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其中 子流程定义如下 ：

  <callActivity id="sid-A18F2859-7517-4FE3-9492-E1D554D67E08" name="子流程" calledElement="process_demo" activiti:inheritVariables="false">callActivity>
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子流程定义

<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/processdef">
  <process id="process_demo" name="简单单线流程" isExecutable="true">
    <startEvent id="sid-49B8F59F-916D-4470-B47D-E102F46402B3">startEvent>
    <userTask id="sid-3D5E6338-B2EF-4235-AC08-63E311EEF45E" name="任务1">userTask>
    <sequenceFlow id="sid-28BF011E-A3F1-48EC-91C3-F187D84FCC67" sourceRef="sid-49B8F59F-916D-4470-B47D-E102F46402B3" targetRef="sid-3D5E6338-B2EF-4235-AC08-63E311EEF45E">sequenceFlow>
    <userTask id="sid-C8ED4D8D-8C94-4BA2-BFE7-6B315DC03518" name="任务2">userTask>
    <sequenceFlow id="sid-D1065EBF-AA27-4C1D-BE35-064EBFD839C1" sourceRef="sid-3D5E6338-B2EF-4235-AC08-63E311EEF45E" targetRef="sid-C8ED4D8D-8C94-4BA2-BFE7-6B315DC03518">sequenceFlow>
    <endEvent id="sid-AAD9DA48-D9DC-4CC2-8F77-D602D787D894" name="结束">endEvent>
    <sequenceFlow id="sid-538E7A61-32DB-48C6-8A67-599F7E97562D" sourceRef="sid-C8ED4D8D-8C94-4BA2-BFE7-6B315DC03518" targetRef="sid-AAD9DA48-D9DC-4CC2-8F77-D602D787D894">sequenceFlow>
  process>
definitions>
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查询Call Activity

由于CallActivity并未继承Task类，所以使用 historyService.createHistoricTaskInstanceQuery()无法查询到CallActivity。

CallActivity继承关系如下 ：

根据继承关系可以看出CallActivity继承了Activity对象，因此可以使用 historyService.createHistoricActivityInstanceQuery()进行查询。

查询实例如下 ：

  List<HistoricActivityInstance> list = historyService.createHistoricActivityInstanceQuery()
                .processInstanceId(processInstanceId).list();
        for (HistoricActivityInstance activityInstance : list) {
          log.info("【流程实例】 实例名称 ：[ {} ] 实例类型[ {} ] ID[ {} ] callInstanceId[ {} ]"
                  ,activityInstance.getActivityName(),activityInstance.getActivityType(),
                  activityInstance.getId(),activityInstance.getCalledProcessInstanceId());
        }
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查询结果如下 ：

[ 21:32:39.976 ] INFO | ActivitiTestController :: allTask | -  【流程实例】 实例名称 ：[ null ] 实例类型[ startEvent ] ID[ 62f1ddd2e073d82423e53d98 ] callInstanceId[ null ] 
[ 21:32:39.976 ] INFO | ActivitiTestController :: allTask | -  【流程实例】 实例名称 ：[ 主任务开始 ] 实例类型[ userTask ] ID[ 62f1ddd2e073d82423e53d99 ] callInstanceId[ null ] 
[ 21:32:39.976 ] INFO | ActivitiTestController :: allTask | -  【流程实例】 实例名称 ：[ 子流程 ] 实例类型[ callActivity ] ID[ 62f1de08e073d82423e53d9b ] callInstanceId[ 62f1de08e073d82423e53d9c ] 
[ 21:32:39.977 ] INFO | ActivitiTestController :: allTask | -  【流程实例】 实例名称 ：[ 主任务 ] 实例类型[ userTask ] ID[ 62f1e09ce073d82423e53da4 ] callInstanceId[ null ] 

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传递变量

activiti 支持在调用子流程时将变量传递给子流程，同时也支持当子流程结束时将变量传递给主流程。

<callActivity id="callSubProcess" calledElement="checkCreditProcess" >
  <extensionElements>
	  <activiti:in source="someVariableInMainProcess" target="nameOfVariableInSubProcess" />
	  <activiti:out source="someVariableInSubProcess" target="nameOfVariableInMainProcess" />
  extensionElements>
callActivity>
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除变量传递之外，activiti还支持公式。

<callActivity id="callSubProcess" calledElement="checkCreditProcess" >
	<extensionElements>
	  <activiti:in sourceExpression="${x+5}" target="y" />
	  <activiti:out source="${y+5}" target="z" />
	extensionElements>
callActivity>
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z = y+5 = x+5+5