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官网文档：https://www.activiti.org/userguide/#queryAPI

1. Activit的简单源码解读

     activiti的官方文档讲解详细很详细，也很范。按着文档写完了一个简单的demo发现，现实中的大多数问题，还是没法很好的解决。

例如：首先我需要知道的是，activiti的有那些表，及各个表的作用。这个网上有人罗列过，但总是觉得不通透。

所以，我先简单看了一下activiti数据处理的源码。

1.1 流程发布

• RepositoryServiceImpl

进行对那个操作的封装，传递Command接口的对应子类，里面封装了具体的操作

  public Deployment deploy(DeploymentBuilderImpl deploymentBuilder) {     return commandExecutor.execute(new DeployCmd<Deployment>(deploymentBuilder));   } 

• CommandInvoker

commandExecutor.execute() 这个方法的执行本质，是里面的CommandInterceptor执行链式的execute,而实质执行的是传进来的CMD接口类的execute方法。具体如下所示。

 public <T> T execute(final CommandConfig config, final Command<T> command) {     final CommandContext commandContext = Context.getCommandContext();      //省略一些代码      commandContext.getAgenda().planOperation(new Runnable() {       @Override       public void run() {         commandContext.setResult(command.execute(commandContext));//这里是关键       }     });       // 省略一些代码。。。。。。。。。。。。      return (T) commandContext.getResult();   }  

• DeployCmd(从这里调用DataManager的实现类进行相关数据库操作)

public Deployment execute(CommandContext commandContext) {      // Backwards compatibility with Activiti v5     if (commandContext.getProcessEngineConfiguration().isActiviti5CompatibilityEnabled()         && deploymentBuilder.getDeploymentProperties() != null          && deploymentBuilder.getDeploymentProperties().containsKey(DeploymentProperties.DEPLOY_AS_ACTIVITI5_PROCESS_DEFINITION)         && deploymentBuilder.getDeploymentProperties().get(DeploymentProperties.DEPLOY_AS_ACTIVITI5_PROCESS_DEFINITION).equals(Boolean.TRUE)) {                return deployAsActiviti5ProcessDefinition(commandContext);     }      return executeDeploy(commandContext);   }   

• DeploymentEntityManagerImpl

实际数据库操作的是DataManager的实现类，进行数据库操作。

这个我们能看出来是有两个

  @Override   public void insert(DeploymentEntity deployment) {     insert(deployment, false);      for (ResourceEntity resource : deployment.getResources().values()) {       resource.setDeploymentId(deployment.getId());       getResourceEntityManager().insert(resource);     }   } 

• 对应的xml操作

在mapping目录下可以查找到对应的操作。前面的${prefix}标识数据库，activiti已经帮我们判断好了，不需要我们再传入。

  <insert id="insertDeployment" parameterType="org.activiti.engine.impl.persistence.entity.DeploymentEntityImpl">     insert into ${prefix}ACT_RE_DEPLOYMENT(ID_, NAME_, CATEGORY_, KEY_, TENANT_ID_, DEPLOY_TIME_, ENGINE_VERSION_)     values(#{id, jdbcType=VARCHAR}, #{name, jdbcType=VARCHAR}, #{category, jdbcType=VARCHAR}, #{key, jdbcType=VARCHAR}, #{tenantId, jdbcType=VARCHAR}, #{deploymentTime, jdbcType=TIMESTAMP}, #{engineVersion, jdbcType=VARCHAR})   </insert>  <insert id="insertResource" parameterType="org.activiti.engine.impl.persistence.entity.ResourceEntityImpl">     insert into ${prefix}ACT_GE_BYTEARRAY(ID_, REV_, NAME_, BYTES_, DEPLOYMENT_ID_, GENERATED_)     values (#{id, jdbcType=VARCHAR}, 1, #{name, jdbcType=VARCHAR}, #{bytes, jdbcType=${blobType}}, #{deploymentId, jdbcType=VARCHAR}, #{generated, jdbcType=BOOLEAN})     </insert>   

1.2 数据查询

• DataManager

数据查询操作本质都是通过DataManger的实现类MybatisDeploymentDataManager进行操作；

  @Override   public List<Deployment> executeList(CommandContext commandContext, Page page) {     checkQueryOk();     return commandContext.getDeploymentEntityManager().findDeploymentsByQueryCriteria(this, page);   }    @Override   @SuppressWarnings("unchecked")   public List<Deployment> findDeploymentsByQueryCriteria(DeploymentQueryImpl deploymentQuery, Page page) {     final String query = "selectDeploymentsByQueryCriteria";     return getDbSqlSession().selectList(query, deploymentQuery, page);   }     

• 查找xml中对应的sql

  <select id="selectDeploymentsByQueryCriteria" parameterType="org.activiti.engine.impl.DeploymentQueryImpl" resultMap="deploymentResultMap">   	${limitBefore}     select distinct RES.* ${limitBetween}     <include refid="selectDeploymentsByQueryCriteriaSql"/>     ${orderBy}     ${limitAfter}   </select>  

1.3 任务执行

需要了解任务类型，以及网关相关知识。

• TaskService

taskService.complete(task.getId(), taskVariables); 

• AbstractCompleteTaskCmd

protected void executeTaskComplete(CommandContext commandContext, TaskEntity taskEntity, Map<String, Object> variables, boolean localScope) {     // Task complete logic      if (taskEntity.getDelegationState() != null && taskEntity.getDelegationState().equals(DelegationState.PENDING)) {       throw new ActivitiException("A delegated task cannot be completed, but should be resolved instead.");     }     //执行节点监听事件       commandContext.getProcessEngineConfiguration().getListenerNotificationHelper().executeTaskListeners(taskEntity, TaskListener.EVENTNAME_COMPLETE);     if (Authentication.getAuthenticatedUserId() != null && taskEntity.getProcessInstanceId() != null) {        //查找任务select * from ${prefix}ACT_RU_EXECUTION        // where ROOT_PROC_INST_ID_ = (select ROOT_PROC_INST_ID_ from ${prefix}ACT_RU_EXECUTION where ID_ = #{parameter})       ExecutionEntity processInstanceEntity = commandContext.getExecutionEntityManager().findById(taskEntity.getProcessInstanceId());       //任务和identity绑定       commandContext.getIdentityLinkEntityManager().involveUser(processInstanceEntity, Authentication.getAuthenticatedUserId(),IdentityLinkType.PARTICIPANT);     }      ActivitiEventDispatcher eventDispatcher = Context.getProcessEngineConfiguration().getEventDispatcher();     if (eventDispatcher.isEnabled()) {       if (variables != null) {         eventDispatcher.dispatchEvent(ActivitiEventBuilder.createEntityWithVariablesEvent(ActivitiEventType.TASK_COMPLETED, taskEntity, variables, localScope));       } else {         eventDispatcher.dispatchEvent(ActivitiEventBuilder.createEntityEvent(ActivitiEventType.TASK_COMPLETED, taskEntity));       }     }       //删除已有的任务相关数据     commandContext.getTaskEntityManager().deleteTask(taskEntity, null, false, false);      // Continue process (if not a standalone task) 激活下个步骤工作     if (taskEntity.getExecutionId() != null) {       ExecutionEntity executionEntity = commandContext.getExecutionEntityManager().findById(taskEntity.getExecutionId());       Context.getAgenda().planTriggerExecutionOperation(executionEntity);     }   }  

1.4 获取类对应表名称

ManagementService

  managementService.getTableName()  

TableDataManagerImpl

static {     // runtime     entityToTableNameMap.put(TaskEntity.class, "ACT_RU_TASK");     entityToTableNameMap.put(ExecutionEntity.class, "ACT_RU_EXECUTION");     entityToTableNameMap.put(IdentityLinkEntity.class, "ACT_RU_IDENTITYLINK");     entityToTableNameMap.put(VariableInstanceEntity.class, "ACT_RU_VARIABLE");      entityToTableNameMap.put(JobEntity.class, "ACT_RU_JOB");     entityToTableNameMap.put(TimerJobEntity.class, "ACT_RU_TIMER_JOB");     entityToTableNameMap.put(SuspendedJobEntity.class, "ACT_RU_SUSPENDED_JOB");     entityToTableNameMap.put(DeadLetterJobEntity.class, "ACT_RU_DEADLETTER_JOB");           entityToTableNameMap.put(EventSubscriptionEntity.class, "ACT_RU_EVENT_SUBSCR");     entityToTableNameMap.put(CompensateEventSubscriptionEntity.class, "ACT_RU_EVENT_SUBSCR");     entityToTableNameMap.put(MessageEventSubscriptionEntity.class, "ACT_RU_EVENT_SUBSCR");     entityToTableNameMap.put(SignalEventSubscriptionEntity.class, "ACT_RU_EVENT_SUBSCR");      // repository     entityToTableNameMap.put(DeploymentEntity.class, "ACT_RE_DEPLOYMENT");     entityToTableNameMap.put(ProcessDefinitionEntity.class, "ACT_RE_PROCDEF");     entityToTableNameMap.put(ModelEntity.class, "ACT_RE_MODEL");     entityToTableNameMap.put(ProcessDefinitionInfoEntity.class, "ACT_PROCDEF_INFO");      // history     entityToTableNameMap.put(CommentEntity.class, "ACT_HI_COMMENT");      entityToTableNameMap.put(HistoricActivityInstanceEntity.class, "ACT_HI_ACTINST");     entityToTableNameMap.put(AttachmentEntity.class, "ACT_HI_ATTACHMENT");     entityToTableNameMap.put(HistoricProcessInstanceEntity.class, "ACT_HI_PROCINST");     entityToTableNameMap.put(HistoricVariableInstanceEntity.class, "ACT_HI_VARINST");     entityToTableNameMap.put(HistoricTaskInstanceEntity.class, "ACT_HI_TASKINST");     entityToTableNameMap.put(HistoricIdentityLinkEntity.class, "ACT_HI_IDENTITYLINK");      // a couple of stuff goes to the same table     entityToTableNameMap.put(HistoricDetailAssignmentEntity.class, "ACT_HI_DETAIL");     entityToTableNameMap.put(HistoricDetailTransitionInstanceEntity.class, "ACT_HI_DETAIL");     entityToTableNameMap.put(HistoricFormPropertyEntity.class, "ACT_HI_DETAIL");     entityToTableNameMap.put(HistoricDetailVariableInstanceUpdateEntity.class, "ACT_HI_DETAIL");     entityToTableNameMap.put(HistoricDetailEntity.class, "ACT_HI_DETAIL");      // Identity module     entityToTableNameMap.put(GroupEntity.class, "ACT_ID_GROUP");     entityToTableNameMap.put(MembershipEntity.class, "ACT_ID_MEMBERSHIP");     entityToTableNameMap.put(UserEntity.class, "ACT_ID_USER");     entityToTableNameMap.put(IdentityInfoEntity.class, "ACT_ID_INFO");      // general     entityToTableNameMap.put(PropertyEntity.class, "ACT_GE_PROPERTY");     entityToTableNameMap.put(ByteArrayEntity.class, "ACT_GE_BYTEARRAY");     entityToTableNameMap.put(ResourceEntity.class, "ACT_GE_BYTEARRAY");          entityToTableNameMap.put(EventLogEntryEntity.class, "ACT_EVT_LOG");      // and now the map for the API types (does not cover all cases)     apiTypeToTableNameMap.put(Task.class, "ACT_RU_TASK");     apiTypeToTableNameMap.put(Execution.class, "ACT_RU_EXECUTION");     apiTypeToTableNameMap.put(ProcessInstance.class, "ACT_RU_EXECUTION");     apiTypeToTableNameMap.put(ProcessDefinition.class, "ACT_RE_PROCDEF");     apiTypeToTableNameMap.put(Deployment.class, "ACT_RE_DEPLOYMENT");     apiTypeToTableNameMap.put(Job.class, "ACT_RU_JOB");     apiTypeToTableNameMap.put(Model.class, "ACT_RE_MODEL");      // history     apiTypeToTableNameMap.put(HistoricProcessInstance.class, "ACT_HI_PROCINST");     apiTypeToTableNameMap.put(HistoricActivityInstance.class, "ACT_HI_ACTINST");     apiTypeToTableNameMap.put(HistoricDetail.class, "ACT_HI_DETAIL");     apiTypeToTableNameMap.put(HistoricVariableUpdate.class, "ACT_HI_DETAIL");     apiTypeToTableNameMap.put(HistoricFormProperty.class, "ACT_HI_DETAIL");     apiTypeToTableNameMap.put(HistoricTaskInstance.class, "ACT_HI_TASKINST");     apiTypeToTableNameMap.put(HistoricVariableInstance.class, "ACT_HI_VARINST");      // identity     apiTypeToTableNameMap.put(Group.class, "ACT_ID_GROUP");     apiTypeToTableNameMap.put(User.class, "ACT_ID_USER");      // TODO: Identity skipped for the moment as no SQL injection is provided     // here   }  

2.activiti表格及对应的数据

初次使用中使用到的表格（后续继续补充）