activiti源码解析系列7 - 启动流程实例命令类源码解析

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已于 2022-04-18 20:47:34 修改

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分类专栏： Activiti 文章标签： OA BPM 工作流 java

于 2022-04-18 20:46:38 首次发布

本文链接：https://blog.youkuaiyun.com/q550145191/article/details/124258932

启动流程实例涉及到的表有：

1、创建流程实例类型的执行实例入库ACT_RU_EXECUTION;
2、启动人入库ACT_RU_IDENTITYLINK starter类型;
3、历史启动实例记录(入库ACT_HI_PROCINST表)
4、dataObjects kv变量设置到流程实例变量map里 （存db(ACT_HI_VARINST历史变量实例表)或者更新缓存）
5、设置变量入库（入库ACT_RU_VARIABLE\（审计记录：入库ACT_HI_VARINST表）
6、针对事件子流程：ACT_RU_EXECUTION和ACT_RU_EVENT_SUBSCR

启动流程实例时候做了哪些操作呢？

主要看StartProcessInstanceCmd命令类：

public ProcessInstance execute(CommandContext commandContext) {
    DeploymentManager deploymentCache = commandContext.getProcessEngineConfiguration().getDeploymentManager();
    //1.查找流程定义
    // Find the process definition
    ProcessDefinition processDefinition = null;
    if (processDefinitionId != null) {
      processDefinition = deploymentCache.findDeployedProcessDefinitionById(processDefinitionId);
      if (processDefinition == null) {
        throw new ActivitiObjectNotFoundException("No process definition found for id = '" + processDefinitionId + "'", ProcessDefinition.class);
      }
    } else if (processDefinitionKey != null && (tenantId == null || ProcessEngineConfiguration.NO_TENANT_ID.equals(tenantId))) {
      processDefinition = deploymentCache.findDeployedLatestProcessDefinitionByKey(processDefinitionKey);
      if (processDefinition == null) {
        throw new ActivitiObjectNotFoundException("No process definition found for key '" + processDefinitionKey + "'", ProcessDefinition.class);
      }
    } else if (processDefinitionKey != null && tenantId != null && !ProcessEngineConfiguration.NO_TENANT_ID.equals(tenantId)) {
      processDefinition = deploymentCache.findDeployedLatestProcessDefinitionByKeyAndTenantId(processDefinitionKey, tenantId);
      if (processDefinition == null) {
        throw new ActivitiObjectNotFoundException("No process definition found for key '" + processDefinitionKey + "' for tenant identifier " + tenantId, ProcessDefinition.class);
      }
    } else {
      throw new ActivitiIllegalArgumentException("processDefinitionKey and processDefinitionId are null");
    }
    //2.通过流程帮助类
    processInstanceHelper = commandContext.getProcessEngineConfiguration().getProcessInstanceHelper();
    ProcessInstance processInstance = createAndStartProcessInstance(processDefinition, businessKey, processInstanceName, variables, transientVariables);
    return processInstance;
  }

可以看到主要做了两个操作：

1、根据key或其他条件查找流程定义

2、流程帮助类的初始化，创建和启动流程实例

我们看下createAndStartProcessInstance

protected ProcessInstance createAndStartProcessInstance(ProcessDefinition processDefinition, String businessKey, String processInstanceName, 
      Map<String,Object> variables, Map<String, Object> transientVariables) {
    return processInstanceHelper.createAndStartProcessInstance(processDefinition, businessKey, processInstanceName, v