activiti:initiator详解

在activiti的startEvent中，我们可以通过initiator属性来设置一个变量，然后启动流程时会将authenticatedUserId(流程启动者)的值设置为activiti:initiator设置的字符串为key的流程变量上，下面看下这部分核心代码：

SubmitStartFormCmd的excute方法：

  protected ProcessInstance execute(CommandContext commandContext, ProcessDefinitionEntity processDefinition) {
    ExecutionEntity processInstance = null;
    if (businessKey != null) {
      processInstance = processDefinition.createProcessInstance(businessKey);
    } else {
      processInstance = processDefinition.createProcessInstance();
    }

    commandContext.getHistoryManager()
      .reportFormPropertiesSubmitted(processInstance, properties, null);
    
    StartFormHandler startFormHandler = processDefinition.getStartFormHandler();
    startFormHandler.submitFormProperties(properties, processInstance);


    processInstance.start();
    
    return processInstance;
  }

接下来就是揭开面纱的时候，进入createProcessInstance方法：

  public ExecutionEntity createProcessInstance(String businessKey, ActivityImpl initial) {
    ExecutionEntity processInstance = null;
  
    if(initial == null) {
      processInstance = (ExecutionEntity) super.createProcessInstance();
    }else {
      processInstance = (ExecutionEntity) super.createProcessInstanceForInitial(initial);
    }


    processInstance.setExecutions(new ArrayList<ExecutionEntity>());
    processInstance.setProcessDefinition(processDefinition);
    // Do not initialize variable map (let it happen lazily)


    // Set business key (if any)
    if (businessKey != null) {
    processInstance.setBusinessKey(businessKey);
    }
    
    // Inherit tenant id (if any)
    if (getTenantId() != null) {
    processInstance.setTenantId(getTenantId());
    }
    
    // Reset the process instance in order to have the db-generated process instance id available
    processInstance.setProcessInstance(processInstance);
    
    // initialize the template-defined data objects as variables first
    Map<String, Object> dataObjectVars = getVariables();
    if (dataObjectVars != null) {
      processInstance.setVariables(dataObjectVars);
    }
    
    String authenticatedUserId = Authentication.getAuthenticatedUserId();
    String initiatorVariableName = (String) getProperty(BpmnParse.PROPERTYNAME_INITIATOR_VARIABLE_NAME);
    if (initiatorVariableName!=null) {
      processInstance.setVariable(initiatorVariableName, authenticatedUserId);
    }
    if (authenticatedUserId != null) {
      processInstance.addIdentityLink(authenticatedUserId, null, IdentityLinkType.STARTER);
    }
    
    Context.getCommandContext().getHistoryManager()
      .recordProcessInstanceStart(processInstance);
    
    if (Context.getProcessEngineConfiguration().getEventDispatcher().isEnabled()) {
        Context.getProcessEngineConfiguration().getEventDispatcher().dispatchEvent(
                ActivitiEventBuilder.createEntityEvent(ActivitiEventType.ENTITY_CREATED, processInstance));
    }
    
    return processInstance;
  }

BpmnParse.PROPERTYNAME_INITIATOR_VARIABLE_NAME的值为initiatorVariableName，在StartEvent启动时会通过activiti:initiator设置的字符串来设置key为initiatorVariableName的Map，然后启动流程时就会使用该Map。

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