Activiti 多个并发子流程的应用
应用场景：
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多个部门发起资金计划，最后统一到财务部审批，每个部门发起资金计划是一个子流程，财务部审批是多个部门的计划同时审批，审批完成后，再提交上级领导审批。
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流程如下：
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要解决以上问题，需要实现多个子流程并行处理的功能。在Activiti5有一个比较强的节点属性就是多实例，它可以支持多实例的子流程，多实例任务，多实体脚本等。目前支持多实例的节点类型有：
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- Java代码??
- <userTask?activiti:assignee="${assignee}"?id="SignTask2"?name="财务主管会签">??
- ????<extensionElements>??
- ????????<activiti:taskListener??
- ????????????class="com.hotent.platform.service.bpm.listener.TaskSignCreateListener"??
- ????????????event="create"?/>??
- ????????<activiti:taskListener??
- ????????????class="com.hotent.platform.service.bpm.listener.TaskAssignListener"??
- ????????????event="assignment"?/>??
- ????????<activiti:taskListener??
- ????????????class="com.hotent.platform.service.bpm.listener.TaskCompleteListener"??
- ????????????event="complete"?/>??
- ????</extensionElements>??
- ????<multiInstanceLoopCharacteristics??
- ????????activiti:elementVariable="assignee"?isSequential="false"??
- ????????activiti:collection="${taskUserAssignService.getSignUser(execution)}">??
- ????????<completionCondition>${signComplete.isComplete(execution)?}??
- ????????</completionCondition>??
- ????</multiInstanceLoopCharacteristics>??
- </userTask>??
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多实例子流程
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Java代码??
- <subProcess?activiti:assignee="${assignee}"?id="SubProcess1"??
- ????name="部门资金计划流程">??
- ????<startEvent?activiti:initiator="startUser"?id="startEvent2"??
- ????????name="开始"?/>??
- ????<endEvent?id="endEvent1"?name="结束1"?/>??
- ????<userTask?id="task3"?name="助理填写">??
- ????????<documentation?/>??
- ????????<extensionElements>??
- ????????????<activiti:taskListener??
- ????????????????class="com.hotent.platform.service.bpm.listener.TaskCreateListener"??
- ????????????????event="create"?/>??
- ????????????<activiti:taskListener??
- ????????????????class="com.hotent.platform.service.bpm.listener.TaskAssignListener"??
- ????????????????event="assignment"?/>??
- ????????????<activiti:taskListener??
- ????????????????class="com.hotent.platform.service.bpm.listener.TaskCompleteListener"??
- ????????????????event="complete"?/>??
- ????????</extensionElements>??
- ????</userTask>??
- ????<userTask?id="task4"?name="部门领导审查">??
- ????????<documentation?/>??
- ????????<extensionElements>??
- ????????????<activiti:taskListener??
- ????????????????class="com.hotent.platform.service.bpm.listener.TaskCreateListener"??
- ????????????????event="create"?/>??
- ????????????<activiti:taskListener??
- ????????????????class="com.hotent.platform.service.bpm.listener.TaskAssignListener"??
- ????????????????event="assignment"?/>??
- ????????????<activiti:taskListener??
- ????????????????class="com.hotent.platform.service.bpm.listener.TaskCompleteListener"??
- ????????????????event="complete"?/>??
- ????????</extensionElements>??
- ????</userTask>??
- ????<sequenceFlow?sourceRef="startEvent2"?targetRef="task3"??
- ????????id="sequenceFlow1"?name=""?/>??
- ????<sequenceFlow?sourceRef="task3"?targetRef="task4"?id="sequenceFlow2"??
- ????????name=""?/>??
- ????<sequenceFlow?sourceRef="task4"?targetRef="endEvent1"?id="sequenceFlow3"??
- ????????name=""?/>??
- ????<extensionElements>??
- ????????<activiti:executionListener?event="start"??
- ????????????class="com.hotent.platform.service.bpm.listener.StartEventListener"?/>??
- ????????<activiti:executionListener?event="end"??
- ????????????class="com.hotent.platform.service.bpm.listener.EndEventListener"?/>??
- ????</extensionElements>??
- ????<multiInstanceLoopCharacteristics??
- ????????activiti:elementVariable="assignee"?isSequential="false"??
- ????????activiti:collection="${taskUserAssignService.getMultipleUser(execution)}"?/>??
- </subProcess>??
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所以关键的配置属性：
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Java代码?? - <multiInstanceLoopCharacteristics??
- ????????activiti:elementVariable="assignee"?isSequential="false"??
- ????????activiti:collection="${taskUserAssignService.getSignUser(execution)}">??
- ????????<completionCondition>${signComplete.isComplete(execution)?}??
- ????????</completionCondition>??
- ????</multiInstanceLoopCharacteristics>??
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我们在控制多实例的个数或人数时，是通过taskUserAssignService的getSignUser获取或getMultipleUser(execution)其集合的个数，从而决定产生多少个实体任务或子流程。
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如实现子流程多实例的获取人数，则来自：
Java代码?? - /**?
- ?????*?获取多实体子流程的执行用户集合?
- ?????*?@param?execution?
- ?????*?@return?
- ?????*?@throws?Execption?
- ?????*/??
- ????public?List<String>?getMultipleUser(ActivityExecution?execution)?throws?Exception{??
- ??????????
- ????????String?nodeId=execution.getActivity().getId();??
- ????????ExecutionEntity?executionEnt=(ExecutionEntity)?execution;??
- ??????????
- ????????List<String>?userIds=(List<String>)execution.getVariable(BpmConst.SUBPRO_MULTI_USERIDS);??
- ??????????
- ????????if(userIds!=null)?return?userIds;??
- ????????Map<String,FlowNode>?nodeMap=?NodeCache.getByActDefId(executionEnt.getProcessDefinitionId());??
- ????????FlowNode?subProcessNode=nodeMap.get(nodeId);??
- ????????FlowNode?firstNode=subProcessNode.getSubFirstNode();??
- ??????????
- ????????FlowNode?secodeNode=firstNode.getNextFlowNodes().get(0);??
- ??????????
- ????????List<String>?userList=nodeUserMapLocal.get().get(secodeNode.getNodeId());??
- ??????????
- ????????logger.debug("userList?size:"?+?userList.size());??
- ??????????
- ????????execution.setVariable(BpmConst.SUBPRO_MULTI_USERIDS,?userList);??
- ????????return?userList;??
- ????}??
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因为该方法会被调用多次，所以其实现的思路是第一次其集合是来自用户的界面选择的人员列表，第一次之后，放到流程变量中去，在后续的获取中，直接从流程变量中获取。
然后在任务的创建的监听器中，从流程变量assignee中获取当前任务的执行人。以上的实现还有一细节就是要解决如何查找到子流程中的第一个任务节点，并且把对应的任务人员授给这任务节点。
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技术顾问：周海龙
qq：1438712946
?电话：13070215345
最终实现的效果如下所示：
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http://www.jee-soft.cn/htsite/html/cpjfw/zxjc/bpmx3/2012/08/27/1346037096478.html
