• Activiti监听器


    学习链接

    Activiti深入研究 - 专栏

    Activiti7工作流从入门到实战(全网最好的)

    Activiti

    Activiti之任务监听器与执行监听器详解

    程序员一灯-activiti监听器

    任务监听器 TaskListener

    任务监听器用于在特定的任务相关事件发生时,执行自定义的Java逻辑或表达式

    • 任务监听器是处理业务逻辑的重要的地方,当任务创建、设定负责人、完成任务时都可以监听的到,从而来处理自己的业务
    • 常用于监听Assignment事件,设置完负责人给负责人发一个消息来通知提示。注意:任务监听器只能用在UserTask上使用

    监听的事件

    • String EVENTNAME_CREATE = “create”;创建):当任务已经创建,并且所有任务参数都已经设置时触发

    • String EVENTNAME_ASSIGNMENT = “assignment”;(指派):当任务已经指派给某人时触发。请注意:当流程执行到达用户任务时,create事件触发前,首先触发assignment事件。这看起来不是自然顺序,但是有实际原因的:当收到create事件时,我们通常希望查看任务的所有参数,包括办理人。

    • String EVENTNAME_COMPLETE = “complete”(完成):当任务已经完成,从运行时数据中删除前触发。

    • String EVENTNAME_DELETE = “delete”(删除):在任务即将被删除前触发。请注意当任务通过completeTask正常完成时也会触发

    注意:assignment事件比create先执行。

    TaskListener 接口

    TaskListener接口继承自BaseTaskListener 接口

    public interface BaseTaskListener extends Serializable {
    
      String EVENTNAME_CREATE = "create";
      String EVENTNAME_ASSIGNMENT = "assignment";
      String EVENTNAME_COMPLETE = "complete";
      String EVENTNAME_DELETE = "delete";
    
      /**
       * Not an actual event, used as a marker-value for {@link BaseTaskListener}s that should be called for all events, including {@link #EVENTNAME_CREATE} , {@link #EVENTNAME_ASSIGNMENT} and
       * {@link #EVENTNAME_COMPLETE} and {@link #EVENTNAME_DELETE}.
       */
      String EVENTNAME_ALL_EVENTS = "all";
    }
    
    
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    TaskListener接口定义,只有notify方法,传入DelegateTask

    public interface TaskListener extends BaseTaskListener {
    
      void notify(DelegateTask delegateTask);
    }
    
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    监听器委托类DelegateTask

    我们在监听方法中,能够拿到DelegateTask对象,因此,我们要熟悉这个对象的相关方法

    package org.activiti.engine.delegate;
     
    import java.util.Collection;
    import java.util.Date;
    import java.util.Set;
     
    import org.activiti.engine.ActivitiObjectNotFoundException;
    import org.activiti.engine.task.DelegationState;
    import org.activiti.engine.task.IdentityLink;
    import org.activiti.engine.task.IdentityLinkType;
     
    /**
     * @author Joram Barrez
     */
    public interface DelegateTask extends VariableScope {
     
      /** DB id of the task. */
      String getId();
      
      /** Name or title of the task. */
      String getName();
      
      /** Change the name of the task. */
      void setName(String name);
     
      /** Free text description of the task. */
      String getDescription();
      
      /** Change the description of the task */
      void setDescription(String description);
      
      /** indication of how important/urgent this task is with a number between 
       * 0 and 100 where higher values mean a higher priority and lower values mean 
       * lower priority: [0..19] lowest, [20..39] low, [40..59] normal, [60..79] high 
       * [80..100] highest */
      int getPriority();
      
      /** indication of how important/urgent this task is with a number between 
       * 0 and 100 where higher values mean a higher priority and lower values mean 
       * lower priority: [0..19] lowest, [20..39] low, [40..59] normal, [60..79] high 
       * [80..100] highest */
      void setPriority(int priority);
      
      /** Reference to the process instance or null if it is not related to a process instance. */
      String getProcessInstanceId();
      
      /** Reference to the path of execution or null if it is not related to a process instance. */
      String getExecutionId();
      
      /** Reference to the process definition or null if it is not related to a process. */
      String getProcessDefinitionId();
     
      /** The date/time when this task was created */
      Date getCreateTime();
      
      /** The id of the activity in the process defining this task or null if this is not related to a process */
      String getTaskDefinitionKey();
     
      /** Indicated whether this task is suspended or not. */
      boolean isSuspended();
     
      /** The tenant identifier of this task */
      String getTenantId();
     
      /** The form key for the user task */
      String getFormKey();
     
      /** Change the form key of the task */
      void setFormKey(String formKey);
      
      /** Returns the execution currently at the task. */
      DelegateExecution getExecution();
      
      /** Returns the event name which triggered the task listener to fire for this task. */
      String getEventName();
     
      /** The current {@link org.activiti.engine.task.DelegationState} for this task. */
      DelegationState getDelegationState();
      
      /** Adds the given user as a candidate user to this task. */
      void addCandidateUser(String userId);
      
      /** Adds multiple users as candidate user to this task. */
      void addCandidateUsers(Collection<String> candidateUsers);
      
      /** Adds the given group as candidate group to this task */
      void addCandidateGroup(String groupId);
      
      /** Adds multiple groups as candidate group to this task. */
      void addCandidateGroups(Collection<String> candidateGroups);
     
      /** The {@link User.getId() userId} of the person responsible for this task. */
      String getOwner();
      
      /** The {@link User.getId() userId} of the person responsible for this task.*/
      void setOwner(String owner);
      
      /** The {@link User.getId() userId} of the person to which this task is delegated. */
      String getAssignee();
      
      /** The {@link User.getId() userId} of the person to which this task is delegated. */
      void setAssignee(String assignee);
      
      /** Due date of the task. */
      Date getDueDate();
      
      /** Change due date of the task. */
      void setDueDate(Date dueDate);
      
      /** The category of the task. This is an optional field and allows to 'tag' tasks as belonging to a certain category. */
      String getCategory();
    	
      /** Change the category of the task. This is an optional field and allows to 'tag' tasks as belonging to a certain category. */
      void setCategory(String category);
      
      /**
       * Involves a user with a task. The type of identity link is defined by the given identityLinkType.
       * @param userId id of the user involve, cannot be null.
       * @param identityLinkType type of identityLink, cannot be null (@see {@link IdentityLinkType}).
       * @throws ActivitiObjectNotFoundException when the task or user doesn't exist.
       */
      void addUserIdentityLink(String userId, String identityLinkType);
      
      /**
       * Involves a group with group task. The type of identityLink is defined by the given identityLink.
       * @param groupId id of the group to involve, cannot be null.
       * @param identityLinkType type of identity, cannot be null (@see {@link IdentityLinkType}).
       * @throws ActivitiObjectNotFoundException when the task or group doesn't exist.
       */
      void addGroupIdentityLink(String groupId, String identityLinkType);
      
      /**
       * Convenience shorthand for {@link #deleteUserIdentityLink(String, String)}; with type {@link IdentityLinkType#CANDIDATE}
       * @param userId id of the user to use as candidate, cannot be null.
       * @throws ActivitiObjectNotFoundException when the task or user doesn't exist.
       */
      void deleteCandidateUser(String userId);
      
      /**
       * Convenience shorthand for {@link #deleteGroupIdentityLink(String, String, String)}; with type {@link IdentityLinkType#CANDIDATE}
       * @param groupId id of the group to use as candidate, cannot be null.
       * @throws ActivitiObjectNotFoundException when the task or group doesn't exist.
       */
      void deleteCandidateGroup(String groupId);
      
      /**
       * Removes the association between a user and a task for the given identityLinkType.
       * @param userId id of the user involve, cannot be null.
       * @param identityLinkType type of identityLink, cannot be null (@see {@link IdentityLinkType}).
       * @throws ActivitiObjectNotFoundException when the task or user doesn't exist.
       */
      void deleteUserIdentityLink(String userId, String identityLinkType);
      
      /**
       * Removes the association between a group and a task for the given identityLinkType.
       * @param groupId id of the group to involve, cannot be null.
       * @param identityLinkType type of identity, cannot be null (@see {@link IdentityLinkType}).
       * @throws ActivitiObjectNotFoundException when the task or group doesn't exist.
       */
      void deleteGroupIdentityLink(String groupId, String identityLinkType);
     
      /**
       * Retrieves the candidate users and groups associated with the task.
       * @return set of {@link IdentityLink}s of type {@link IdentityLinkType#CANDIDATE}.
       */
      Set<IdentityLink> getCandidates();
    }
    
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    任务监听实现方式 — 类class

    绘制流程图

    在这里插入图片描述

    给经理审批节点设置如下任务监听器

    在这里插入图片描述

    自定义任务监听器

    SiteReportUserTaskListener
    import lombok.extern.slf4j.Slf4j;
    import org.activiti.engine.delegate.DelegateTask;
    import org.activiti.engine.delegate.TaskListener;
    
    /**
     * 任务监听器用于在特定的任务相关事件发生时,执行自定义的Java逻辑或表达式
     *
     * 任务监听器支持下列属性:
     *  event(事件)(必填):任务监听器将被调用的任务事件类型。可用的事件有:
     *         create(创建):当任务已经创建,并且所有任务参数都已经设置时触发。
     *         assignment(指派):当任务已经指派给某人时触发。请注意:当流程执行到达用户任务时,create事件触发前,首先触发
     *         assignment事件。这看起来不是自然顺序,但是有实际原因的:当收到create事件时,我们通常希望查看任务的所有参数,包括
     *         办理人。
     *         complete(完成):当任务已经完成,从运行时数据中删除前触发。
     *         delete(删除):在任务即将被删除前触发。请注意当任务通过completeTask正常完成时也会触发
     *
     *   class:需要调用的代理类。这个类必须实现 org.activiti.engine.delegate.TaskListener 接口
     *
     *
     *   expression:(不能与class属性一起使用):指定在事件发生时要执行的表达式。可以为被调用的对象传递 DelegateTask 对象与事件名(使用 task.eventName )作为参数
     *
     *
     *
     *   delegateExpression:可以指定一个能够解析为 TaskListener 接口实现类对象的表达式。与服务任务类似
     *
     *
     */
    @Slf4j
    public class SiteReportUserTaskListener implements TaskListener {
    
        /*
          启动流程时候(按顺序)
            收到事件通知: assignment
            收到事件通知: create
          完成经理审批任务时候(按顺序)
            收到事件通知: complete
            收到事件通知: delete
        */
        @Override
        public void notify(DelegateTask delegateTask) {
            log.info("收到事件通知: {}", delegateTask.getEventName());
        }
    
    
    }
    
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    测试

    1. 先部署该流程
    2. 然后,发起1个流程时,它会收到assignment、create
    3. 然后,部门经理完成该任务,它会收到complete、delete

    监听实现方式 — 表达式expression

    使用activiti:taskListener元素的expression属性来指定监听器

    绘制流程图

    在这里插入图片描述
    如下图给经理审批节点添加任务监听器,设置Expression为${taskListenerExpression.execute(task)}
    在这里插入图片描述

    自定义 TaskListenerExpression

    注意:这个的TaskListenerExpression 需要实现Serializable接口。

    @Slf4j
    public class TaskListenerExpression implements Serializable {
    
        public void execute(DelegateTask delegateTask) {
            log.info("收到事件通知: {}", delegateTask.getEventName());
        }
    
    }
    
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    测试

    1. 先部署该流程

    2. 然后,发起1个流程时,注意发起流程时,这里需要设置taskListenerExpression,然后它会收到assignment、create

      ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
      // 发起流程 需要通过 runtimeService来实现
      RuntimeService runtimeService = engine.getRuntimeService();
      HashMap<String, Object> variables = new HashMap<String, Object>();
      // 在流程执行到某个阶段,或者启动流程实例的时候,用下面代码调用
      HashMap<String, Object> variables = new HashMap<String, Object>();
      variables.put("taskListenerExpression", new TaskListenerExpression());
      ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("listener1", variables);
      
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    3. 然后,部门经理完成该任务,它会收到complete、delete

    spring表达式

    在上面,我们在开启流程时,自己new了1个TaskListenerExpression,并且把它放入了流程变量中。在spring中,我们只需要将此bean定义在spring容器中即可(此处案例定义在activiti.cfg.xml中),在启动流程时,就不需要把它放入流程变量中了,就可以启动流程(注意:一定要把这个bean定义在容器中,否则启动流程时会报错,因为此时不能解析表达式了。当任务执行到该节点的时候,会直接调用该spring管理的bean)。

    监听器实现方式——委托表达式delegateExpression

    委托表达式 和 表达式区别:

    • 委托表达式需要实现TaskListener和序列化接口

    • xml中直接写实现类的变量名,不用写方法名称,默认调取接口方法名

    绘制流程图

    在这里插入图片描述
    设置经理审批节点,当经理审批后,触发表达式的执行

    在这里插入图片描述

    自定义 TaskListenerDelegateExpression

    需要同时实现TaskListener接口 和 Serializable接口

    @Slf4j
    public class TaskListenerDelegateExpression implements TaskListener, Serializable {
        @Override
        public void notify(DelegateTask delegateTask) {
            log.info("TaskListenerDelegateExpression#收到事件通知: {}", delegateTask.getEventName());
        }
    }
    
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    测试

    1. 先部署该流程

    2. 然后,发起1个流程时,注意发起流程时,这里需要设置taskListenerDelegateExpression

      ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
      // 发起流程 需要通过 runtimeService来实现
      RuntimeService runtimeService = engine.getRuntimeService();
      
      HashMap<String, Object> variables = new HashMap<String, Object>();    
      variables.put("taskListenerDelegateExpression", new TaskListenerDelegateExpression());
      
      // 通过流程定义ID来启动流程  返回的是流程实例对象
      ProcessInstance processInstance = runtimeService.startProcessInstanceByKey("listener1", variables);
      
      System.out.println("processInstance.getId() = " + processInstance.getId());
      System.out.println("processInstance.getDeploymentId() = " + processInstance.getDeploymentId());
      System.out.println("processInstance.getDescription() = " + processInstance.getDescription());
      
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    3. 然后,部门经理完成该任务,委托表达式执行,它会收到complete

      ProcessEngine engine = ProcessEngines.getDefaultProcessEngine();
      TaskService taskService = engine.getTaskService();
      List<Task> list = taskService.createTaskQuery().taskAssignee("zhangsan").list();
      Map<String, Object> map = new HashMap<>();
      Task task = list.get(0);
      // 完成经理审批
      taskService.complete(task.getId(), map);
      
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    字段属性使用

    下面这种只能用类这种方式来给类中的某个属性赋值
    在这里插入图片描述

    自定义类SiteReportUserTaskListener

    @Slf4j
    public class SiteReportUserTaskListener implements TaskListener {
    
    	/* 注意:这里写的类型!否则可能会报错 */
    	private Expression fieldNameA;
    
        /*
          完成经理审批任务时候
            收到事件通知: complete
        */
        @Override
        public void notify(DelegateTask delegateTask) {
            log.info("收到事件通知: {}, {}", delegateTask.getEventName(), fieldNameA);
        }
    
    
    }
    
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    通过多次设置字段的值可以得知:fieldNameA取值优先级: 第1个 字符串>第3个 字符串> 第二个 表达式

    总结

    • 一个用户任务节点可以创建多个监听器
    • class类方式实现监听器,不需要在流程变量中加入监听器对象
    • expression方式,监听器可以是一个普通的java类,但要实现序列化接口,需要在流程变量中加入监听器类的对象,或者加入spring容器中
    • delegateExpression,监听器要同时实现TaskListener和序列化接口,需要在流程变量中加入监听器类的对象

    执行监听器 ExecutionListener

    执行监听器的使用场景

    人员动态分配

    • 节点审批人员需要在流程运行过程中动态分配
    • 当前任务节点完成的时候,需要指定下一个节点的处理人(比如,一个请假流程,a员工请假,需要指定下一步需要处理请假流程的领导)

    任务节点调取业务

    • 任务节点完成的时候,需要一些复杂业务,(比如当前节点完成的时候,需要调用我们的jms消息系统发送消息)。

    • 任务流转到当前的节点的时候,需要监控当前任务节点的一些信息或者其他的业务信息。

    • 当前的任务节点分配处理人的时候,需要触发自定义的一些业务。

    流程上处理业务

    • 流程开始结束的时候,需要处理业务信息。

    连线上处理业务

    • 经过任务节点的出线,也就是连线的时候,需要触发自定义的业务。

    监听的事件

    ExecutionListener 接口

    ExecutionListener 继承自BaseExecutionListener 接口

    /*
    Callback interface to be notified of execution events like 
    	starting a process instance, 
    	ending an activity instance,
    	taking a transition.
    */
    public interface BaseExecutionListener extends Serializable {
    
      String EVENTNAME_START = "start";
      String EVENTNAME_END = "end";
      String EVENTNAME_TAKE = "take";
    }
    
    
    
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    ExecutionListener 接口如下

    public interface ExecutionListener extends BaseExecutionListener {
    
      void notify(DelegateExecution execution);
    }
    
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    DelegateExecution

    public interface DelegateExecution extends VariableScope {
    
      /**
       * Unique id of this path of execution that can be used as a handle to provide external signals back into the engine after wait states.
       */
      String getId();
    
      /** Reference to the overall process instance */
      String getProcessInstanceId();
      
      /**
       * The 'root' process instance. When using call activity for example, the processInstance
       * set will not always be the root. This method returns the topmost process instance.
       */
      String getRootProcessInstanceId();
    
      /**
       * Will contain the event name in case this execution is passed in for an {@link ExecutionListener}.
       */
      String getEventName();
      
      /**
       * Sets the current event (typically when execution an {@link ExecutionListener}). 
       */
      void setEventName(String eventName);
    
      /**
       * The business key for the process instance this execution is associated with.
       */
      String getProcessInstanceBusinessKey();
    
      /**
       * The process definition key for the process instance this execution is associated with.
       */
      String getProcessDefinitionId();
    
      /**
       * Gets the id of the parent of this execution. If null, the execution represents a process-instance.
       */
      String getParentId();
    
      /**
       * Gets the id of the calling execution. If not null, the execution is part of a subprocess.
       */
      String getSuperExecutionId();
    
      /**
       * Gets the id of the current activity.
       */
      String getCurrentActivityId();
    
      /**
       * Returns the tenant id, if any is set before on the process definition or process instance.
       */
      String getTenantId();
      
      /**
       * The BPMN element where the execution currently is at. 
       */
      FlowElement getCurrentFlowElement();
    
      /**
       * Change the current BPMN element the execution is at. 
       */
      void setCurrentFlowElement(FlowElement flowElement);
      
      /**
       * Returns the {@link ActivitiListener} instance matching an {@link ExecutionListener}
       * if currently an execution listener is being execution. 
       * Returns null otherwise.
       */
      ActivitiListener getCurrentActivitiListener();
    
      /**
       * Called when an {@link ExecutionListener} is being executed. 
       */
      void setCurrentActivitiListener(ActivitiListener currentActivitiListener);
    
      /* Execution management */
    
      /**
       * returns the parent of this execution, or null if there no parent.
       */
      DelegateExecution getParent();
    
      /**
       * returns the list of execution of which this execution the parent of.
       */
      List<? extends DelegateExecution> getExecutions();
    
      /* State management */
    
      /**
       * makes this execution active or inactive.
       */
      void setActive(boolean isActive);
    
      /**
       * returns whether this execution is currently active.
       */
      boolean isActive();
    
      /**
       * returns whether this execution has ended or not.
       */
      boolean isEnded();
    
      /**
       * changes the concurrent indicator on this execution.
       */
      void setConcurrent(boolean isConcurrent);
    
      /**
       * returns whether this execution is concurrent or not.
       */
      boolean isConcurrent();
    
      /**
       * returns whether this execution is a process instance or not.
       */
      boolean isProcessInstanceType();
    
      /**
       * Inactivates this execution. This is useful for example in a join: the execution still exists, but it is not longer active.
       */
      void inactivate();
    
      /**
       * Returns whether this execution is a scope.
       */
      boolean isScope();
    
      /**
       * Changes whether this execution is a scope or not.
       */
      void setScope(boolean isScope);
      
      /**
       * Returns whather this execution is the root of a multi instance execution.
       */
      boolean isMultiInstanceRoot();
      
      /**
       * Changes whether this execution is a multi instance root or not.
       * @param isMultiInstanceRoot
       */
      void setMultiInstanceRoot(boolean isMultiInstanceRoot);
    
    }
    
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    使用方法与上面大致相同,只不过ExecutionListener还可以设置在开始和结束节点、连线上。

    执行监听器与任务监听器区别

    介绍

    执行监听器与任务监听器的基本原理和使用方法。当流程途径连线或者节点的时候,会触发对应的事件类型。执行监听器与任务监听器在生产中经常会用在几个方面:

    • 动态分配节点处理人。通过前一个节点设置的变量,在运行到下一个节点时设置对应的处理人;
    • 当流程运行到某个节点时,发送邮件或短信给待办用户;
    • 统计流程处理时长,是否超时等;
    • 业务层面数据处理。

    任务监听器顾名思义是监听任务的。任务监听器的生命周期如下图所示,会经历assignment、create、complete、delete。当流程引擎触发这四种事件类型时,对应的任务监听器会捕获其事件类型,再按照监听器的处理逻辑进行处理。

    在这里插入图片描述
    执行监听器则监听流程的所有节点和连线。主要有start、end、take事件。其中节点有start、end两种事件,而连线则有take事件。下图是执行监听器的生命周期:
    在这里插入图片描述
    接下来通过代码去演示监听器效果。 首先我们创建一个执行监听器的类:

    package listener;
     
    import org.activiti.engine.delegate.DelegateExecution;
    import org.activiti.engine.delegate.ExecutionListener;
     
    public class MyExecutionListener implements ExecutionListener {
     
    	public void notify(DelegateExecution execution) throws Exception {
    		System.out.println("============executionListener start============");
    		String eventName = execution.getEventName();
    		String currentActivitiId = execution.getCurrentActivityId();
    		System.out.println("事件名称:" + eventName);
    		System.out.println("ActivitiId:" + currentActivitiId);
    		System.out.println("============executionListener  end============");
    	}
    }
    
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    自定义执行监听器需要实现ExecutionListener接口,并且实现notify方法。这里我们打印对应的事件和活动节点id

    接下来创建一个自定任务监听器:

    package listener;
     
    import org.activiti.engine.delegate.DelegateTask;
    import org.activiti.engine.delegate.TaskListener;
     
    public class MyTaskListener implements TaskListener{
     
    	public void notify(DelegateTask delegateTask) {
    		System.out.println("============TaskListener start============");
    		String taskDefinitionKey = delegateTask.getTaskDefinitionKey();
    		String eventName = delegateTask.getEventName();
    		System.out.println("事件名称:" + eventName);
    		System.out.println("taskDefinitionKey:" + taskDefinitionKey);
    		System.out.println("============TaskListener end============");
    	}
    }
    
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    自定义任务监听器需要实现TaskListener接口,并且实现notify方法。这里我们打印对应的事件和任务节点键值(即bpmn图里userTask的id)。

    之后新建一个bpmn图:

    <?xml version="1.0" encoding="UTF-8"?>
    <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/test">
      <process id="listenerBpmProcess" name="My process" isExecutable="true">
        <startEvent id="startevent1" name="Start"></startEvent>
        <userTask id="usertask1" name="myTask1" activiti:assignee="张三">
          <extensionElements>
            <activiti:executionListener event="start" class="listener.MyExecutionListener"></activiti:executionListener>
            <activiti:executionListener event="end" class="listener.MyExecutionListener"></activiti:executionListener>
            <activiti:taskListener event="all" class="listener.MyTaskListener"></activiti:taskListener>
          </extensionElements>
        </userTask>
        <endEvent id="endevent1" name="End"></endEvent>
        <sequenceFlow id="flow1" sourceRef="startevent1" targetRef="usertask1"></sequenceFlow>
        <sequenceFlow id="flow2" sourceRef="usertask1" targetRef="endevent1"></sequenceFlow>
      </process>
      <bpmndi:BPMNDiagram id="BPMNDiagram_listenerBpmProcess">
        <bpmndi:BPMNPlane bpmnElement="listenerBpmProcess" id="BPMNPlane_listenerBpmProcess">
          <bpmndi:BPMNShape bpmnElement="startevent1" id="BPMNShape_startevent1">
            <omgdc:Bounds height="41.0" width="35.0" x="505.0" y="40.0"></omgdc:Bounds>
          </bpmndi:BPMNShape>
          <bpmndi:BPMNShape bpmnElement="usertask1" id="BPMNShape_usertask1">
            <omgdc:Bounds height="55.0" width="105.0" x="470.0" y="150.0"></omgdc:Bounds>
          </bpmndi:BPMNShape>
          <bpmndi:BPMNShape bpmnElement="endevent1" id="BPMNShape_endevent1">
            <omgdc:Bounds height="35.0" width="35.0" x="505.0" y="240.0"></omgdc:Bounds>
          </bpmndi:BPMNShape>
          <bpmndi:BPMNEdge bpmnElement="flow1" id="BPMNEdge_flow1">
            <omgdi:waypoint x="522.0" y="81.0"></omgdi:waypoint>
            <omgdi:waypoint x="522.0" y="150.0"></omgdi:waypoint>
          </bpmndi:BPMNEdge>
          <bpmndi:BPMNEdge bpmnElement="flow2" id="BPMNEdge_flow2">
            <omgdi:waypoint x="522.0" y="205.0"></omgdi:waypoint>
            <omgdi:waypoint x="522.0" y="240.0"></omgdi:waypoint>
          </bpmndi:BPMNEdge>
        </bpmndi:BPMNPlane>
      </bpmndi:BPMNDiagram>
    </definitions>
    
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    这里我们给userTask1添加了执行监听器和任务监听器。部署bpmn图后,我们观察流程运转时监听器的触发时机和作用,启动流程:

    public void startProcessById() {
        RuntimeService runtimeService = pe.getRuntimeService();
        ProcessInstance pi = runtimeService.startProcessInstanceById("listenerBpmProcess:1:4");
    }
    
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    流程启动后,从开始节点运转到userTask1节点,观察控制台输出:

    ============executionListener start============
    事件名称:start
    ActivitiId:usertask1
    ============executionListener  end============
    ============TaskListener start============
    事件名称:assignment
    taskDefinitionKey:usertask1
    ============TaskListener end============
    ============TaskListener start============
    事件名称:create
    taskDefinitionKey:usertask1
    ============TaskListener end============
    
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    可以看到流程走到userTask1节点时,首先触发start事件,调用我们自定义的执行监听器,随后触发assignment和create事件,执行自定义任务监听器的内容。注意这里是先触发assignment进行人员分配,再触发create事件,与一般的认知有些差异。

    接下来通过taskService的complete方法完成userTask1节点上流程的提交,观察控制台输出:

    ============TaskListener start============
    事件名称:complete
    taskDefinitionKey:usertask1
    ============TaskListener end============
    ============TaskListener start============
    事件名称:delete
    taskDefinitionKey:usertask1
    ============TaskListener end============
    ============executionListener start============
    事件名称:end
    ActivitiId:usertask1
    ============executionListener  end============
    
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    可以看到userTask1节点提交的时候,首先触发complete事件再触发delete事件,最后触发end事件。

    以上就是执行监听器与任务监听器的基本使用方式。实际工程中,由于流程节点十分多,并且流程和业务常常需要进行微调,通常是不会在bpmn图上逐个节点添加监听器的,往往是在解析bpmn对象期间利用对象解析器动态添加监听器。

    手动测试

    画如下的流程图,

    • 给开始节点、经理审批节点、开始节点到经理审批节点之间的连线上都添加MyExecutionListener,3种类型包括start、task、end都加上。

    • 给经理审批节点加上MyTaskListener,4种类型包括assignment、create、complete、delete都加上。因为TaskListener只能添加给userTask节点
      在这里插入图片描述
      bpmn文件如下:

      
      <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="listener2" name="listener2" isExecutable="true">
          <documentation>listener2documentation>
          <startEvent id="startEvent1">
            <extensionElements>
              <activiti:executionListener event="start" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:executionListener event="end" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:executionListener event="take" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
            extensionElements>
          startEvent>
          <userTask id="pmNode" name="经理审批" activiti:assignee="zhangsan">
            <extensionElements>
              <activiti:executionListener event="start" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:executionListener event="end" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:executionListener event="take" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:taskListener event="create" class="com.zzhua.listener.MyTaskListener">activiti:taskListener>
              <activiti:taskListener event="assignment" class="com.zzhua.listener.MyTaskListener">activiti:taskListener>
              <activiti:taskListener event="complete" class="com.zzhua.listener.MyTaskListener">activiti:taskListener>
              <activiti:taskListener event="delete" class="com.zzhua.listener.MyTaskListener">activiti:taskListener>
              <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler">modeler:initiator-can-complete>
            extensionElements>
          userTask>
          <userTask id="HrNode" name="人事审批" activiti:assignee="lisi">
            <extensionElements>
              <modeler:initiator-can-complete xmlns:modeler="http://activiti.com/modeler">modeler:initiator-can-complete>
            extensionElements>
          userTask>
          <endEvent id="sid-95094C86-3D9A-4AF0-9575-26BF6EE37AF0">endEvent>
          <sequenceFlow id="sid-CF295D96-0BAD-44EF-8461-8D0CEA5D60EF" sourceRef="HrNode" targetRef="sid-95094C86-3D9A-4AF0-9575-26BF6EE37AF0">sequenceFlow>
          <sequenceFlow id="sid-D3BAAF86-675D-49CC-A831-1403C117D883" sourceRef="startEvent1" targetRef="pmNode">
            <extensionElements>
              <activiti:executionListener event="start" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:executionListener event="end" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
              <activiti:executionListener event="take" class="com.zzhua.listener.MyExecutionListener">activiti:executionListener>
            extensionElements>
          sequenceFlow>
          <sequenceFlow id="sid-6A9C7D82-BFA1-449D-A280-649024CDA85A" sourceRef="pmNode" targetRef="HrNode">sequenceFlow>
        process>
        <bpmndi:BPMNDiagram id="BPMNDiagram_listener2">
          ...
        bpmndi:BPMNDiagram>
      definitions>
      
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    先部署流程,然后开启1个流程,输出如下,这说明开始节点:没有take,只有start和end,连线:有start、take、end,userTask:有start,然后顺序是任务监听器的assignment、create

    ============executionListener start============
    事件名称:start
    ActivitiId:startEvent1
    ============executionListener  end============
    
    ============executionListener start============
    事件名称:end
    ActivitiId:startEvent1
    ============executionListener  end============
    
    ============executionListener start============
    事件名称:start
    ActivitiId:sid-D3BAAF86-675D-49CC-A831-1403C117D883
    ============executionListener  end============
    ============executionListener start============
    事件名称:take
    ActivitiId:sid-D3BAAF86-675D-49CC-A831-1403C117D883
    ============executionListener  end============
    ============executionListener start============
    事件名称:end
    ActivitiId:sid-D3BAAF86-675D-49CC-A831-1403C117D883
    ============executionListener  end============
    
    ============executionListener start============
    事件名称:start
    ActivitiId:pmNode
    ============executionListener  end============
    
    ============TaskListener start============
    事件名称:assignment
    taskDefinitionKey:pmNode
    ============TaskListener end============
    
    ============TaskListener start============
    事件名称:create
    taskDefinitionKey:pmNode
    ============TaskListener end============
    
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    完成经理审批节点时的,输入如下,先是任务监听器的complete,然后是delete

    ============TaskListener start============
    事件名称:complete
    taskDefinitionKey:pmNode
    ============TaskListener end============
    ============TaskListener start============
    事件名称:delete
    taskDefinitionKey:pmNode
    ============TaskListener end============
    
    ============executionListener start============
    事件名称:end
    ActivitiId:pmNode
    ============executionListener  end============
    
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    工作流程事件监听 ActivitiEventListener

    在流程运转的过程中,流程引擎会发出很多不同的事件,前面的文章,我们通过执行监听器和任务监听器捕获到对应事件并进行处理。除了这两个监听器以外,activiti从5.15版开始加入了全局事件监听器,这样很多重复的监听器就不需要在每个活动上去绑定

    添加全局监听器有几种方式,包括 通过流程引擎文件方式进行配置、通过流程文档进行配置、动态添加全局事件监听器等方式,下面分别展示这几种方法:

    可监听事件类型

    在这里插入图片描述

    配置方式

    MyCfgActivitiEventListener

    直接设置SpringProcessEngineConfiguration#eventListeners属性,即可

    
    <beans xmlns="http://www.springframework.org/schema/beans"
           xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:tx="http://www.springframework.org/schema/tx"
           xsi:schemaLocation="http://www.springframework.org/schema/beans
                               http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd">
    
        
        <bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource">
            <property name="driverClassName" value="com.mysql.cj.jdbc.Driver"/>
            <property name="url" value="jdbc:mysql://localhost:3306/activiti2?characterEncoding=utf-8&nullCatalogMeansCurrent=true&serverTimezone=Asia/Shanghai&useSSL=false"/>
            <property name="username" value="root"/>
            <property name="password" value="root"/>
            <property name="maxActive" value="3"/>
            <property name="maxIdle" value="1"/>
        bean>
    
        
        <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
            
            <property name="dataSource" ref="dataSource"/>
            
            <property name="transactionManager" ref="transactionManager"/>
            
            <property name="databaseSchemaUpdate" value="true"/>
            <property name="eventListeners">
                <list>
                    <bean class="com.zzhua.listener.acti.MyCfgActivitiEventListener"/>
                list>
            property>
            <property name="typedEventListeners">
                <map>
                    <entry key="TASK_CREATED">
                        <list>
                            <bean class="com.zzhua.listener.acti.MyCfgTypeActivitiEventListener"/>
                        list>
                    entry>
                    <entry key="PROCESS_COMPLETED">
                        <list>
                            <bean class="com.zzhua.listener.acti.MyCfgTypeActivitiEventListener"/>
                        list>
                    entry>
                map>
            property>
        bean>
    
        
        <bean id="processEngine" class="org.activiti.spring.ProcessEngineFactoryBean">
            <property name="processEngineConfiguration" ref="processEngineConfiguration"/>
        bean>
    
        
        <bean id="repositoryService" factory-bean="processEngine" factory-method="getRepositoryService"/>
    
        
        <bean id="runtimeService" factory-bean="processEngine" factory-method="getRuntimeService"/>
    
        
        <bean id="taskService" factory-bean="processEngine" factory-method="getTaskService"/>
    
        
        <bean id="historyService" factory-bean="processEngine" factory-method="getHistoryService"/>
    
        
        <bean id="transactionManager" class="org.springframework.jdbc.datasource.DataSourceTransactionManager">
            <property name="dataSource" ref="dataSource"/>
        bean>
    
        
        <tx:advice id="txAdvice" transaction-manager="transactionManager">
            <tx:attributes>
                
                <tx:method name="save*" propagation="REQUIRED"/>
                <tx:method name="insert*" propagation="REQUIRED"/>
                <tx:method name="delete*" propagation="REQUIRED"/>
                <tx:method name="update*" propagation="REQUIRED"/>
                <tx:method name="find*" propagation="SUPPORTS" read-only="true"/>
                <tx:method name="get*" propagation="SUPPORTS" read-only="true"/>
            tx:attributes>
        tx:advice>
    
        
    
    beans>
    
    
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    public class MyCfgActivitiEventListener implements ActivitiEventListener {
    
        @Override
        public void onEvent(ActivitiEvent event) {
            System.out.println("【cfg-eventName】:" + event.getType().name());
        }
    
        @Override
        public boolean isFailOnException() {
            return false;
        }
    }
    
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    MyCfgTypeActivitiEventListener

    直接设置SpringProcessEngineConfiguration#typedEventListeners属性,即可,配置同上,这种方式可以为指定的事件类型添加一批监听器,这种属于动态添加,在spring或springboot中,就直接在ProcessEngineConfiguration创建时添加监听器即可。

    如果需要禁用,可以设置ProcessEngineConfiguration#enableEventDispatcher为false来关闭事件派发器。

    事实上,在ProcessEngineConfiguration上有很多可以设置的属性,后面可以探究下。

    public class MyCfgTypeActivitiEventListener  implements ActivitiEventListener {
    
        @Override
        public void onEvent(ActivitiEvent event) {
            System.out.println("【cfg-type-eventName】:" + event.getType().name());
        }
    
        @Override
        public boolean isFailOnException() {
            return false;
        }
    }
    
    
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    MyBpmnActivitiEventListener

    在bpmn画图工具中设置
    在这里插入图片描述

    public class MyBpmnActivitiEventListener implements ActivitiEventListener {
    
        @Override
        public void onEvent(ActivitiEvent event) {
            System.out.println("【bpmn-eventName】:" + event.getType().name());
        }
    
        @Override
        public boolean isFailOnException() {
            return false;
        }
    }
    
    
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    MyRuActivitiEventListener

    使用RuntimeService#addEventListener添加,也可以

    public class MyRuActivitiEventListener implements ActivitiEventListener {
        @Override
        public void onEvent(ActivitiEvent event) {
            System.out.println("【ru-eventName】:" + event.getType().name());
        }
    
        @Override
        public boolean isFailOnException() {
            return false;
        }
    }
    
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  • 原文地址:https://blog.csdn.net/qq_16992475/article/details/134235921