Activiti监听器

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Activiti监听器

文章目录

• 学习链接
• 任务监听器 TaskListener
• • 监听器监听的事件
  • 监听器委托类DelegateTask
  • 任务监听实现方式 — 类class
  • • 绘制流程图
    • 自定义任务监听器
    • • SiteReportUserTaskListener
    • 测试
  • 监听实现方式 — 表达式expression
  • • 绘制流程图
    • 自定义 TaskListenerExpression
    • 测试
    • spring表达式
• 执行监听器 ExecutionListener
• 工作流程事件监听 ActivitiEventListener

学习链接

Activiti深入研究 - 专栏

• 5.2 activiti任务监听器TaskListener
• 5.1 activiti执行监听器ExecutionListener
• 5.3 activiti工作流程事件监听ActivitiEventListener

Activiti7工作流从入门到实战(全网最好的)

• Activiti7工作流引擎：基础篇(六) 任务监听器和流程监听器

Activiti

• activiti学习（五）——执行监听器与任务监听器的基本使用
• activiti学习（十一）——全局事件监听器的基本使用及其原理

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。

监听器监听的事件

• 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。

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();
}

任务监听实现方式 — 类class

绘制流程图

给经理审批节点设置如下任务监听器

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*/@Overridepublic void notify(DelegateTask delegateTask) {log.info("收到事件通知: {}", delegateTask.getEventName());}}

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

自定义 TaskListenerExpression

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

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

   // 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);
   

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，在启动流程时，不需要把它放入流程变量中，就可以启动流程了（注意：一定要把这个bean定义在容器中，否则会报错）。

执行监听器 ExecutionListener

工作流程事件监听 ActivitiEventListener

本文标签： Activiti监听器