activiti 修改定时器的执行时间

最新推荐文章于 2023-02-21 15:52:03 发布

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#边界事件 #activiti #定时器时间修改 #定时器

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本文介绍如何在Activiti流程引擎中动态修改已启动流程实例的定时器执行时间。通过自定义实现Command接口并利用DbSqlSession执行更新操作，实现了定时器任务执行时间的灵活调整。

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在使用activiti5.19过程中，有一个应用场景需要在流程实例启动后，对定时器的执行时间进行修改，但是activiti本身并没有提供现成的api进行操作，需要自己进行处理，处理思路是通过自己实现Command的接口，使用DbSqlSession，来执行update操作，具体操作如下：

1 创建一个修改定时器的命令,实现Command接口，泛型为TimerEntity，表示该命令执行对TimerEntity（对应act_ru_job表）的操作。在execute方法中，获取到DbSqlSession，继而得到具体执行的statement,通过调用sqlSession的udpate方法，执行更新。

    private final class UpdateTimerCommand implements Command<TimerEntity> {
        private final TimerEntity timerEntity;

        public UpdateTimerCommand(TimerEntity timerEntity) {
            this.timerEntity = timerEntity;
        }


        @Override
        public TimerEntity execute(CommandContext commandContext) {
            DbSqlSession dbsqlSession = commandContext.getDbSqlSession();
            String statement = dbsqlSession.getDbSqlSessionFactory()
                    .getUpdateStatement(timerEntity);
            dbsqlSession.getSqlSession().update(statement, timerEntity);
            return timerEntity;
        }
     }

2 通过runtimeService获取到命令执行器 CommandExecutor，执行定时器修改命令

     public void executeUpdate(TimerEntity timerEntity){
        RuntimeServiceImpl rsi  = (RuntimeServiceImpl)runtimeService;
        CommandExecutor commandExecutor = rsi.getCommandExecutor();
        commandExecutor.execute(new UpdateTimerCommand(timerEntity));
     }

3 设置定时器任务新的执行时间

    public void modifyDuedate(Job job,Date duedate){
       if (job != null) {
            if (job instanceof TimerEntity) {
                TimerEntity timer = (TimerEntity) job;
                timer.setDuedate(duedate);
                executeUpdate(timer);
            }
        }
    }

完整代码


import org.activiti.engine.ManagementService;
import org.activiti.engine.RuntimeService;
import org.activiti.engine.impl.RuntimeServiceImpl;
import org.activiti.engine.impl.db.DbSqlSession;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.interceptor.CommandExecutor;
import org.activiti.engine.impl.persistence.entity.TimerEntity;
import org.activiti.engine.runtime.Job;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * Created by ct on 2016/10/23 0023.
 */
@Component
public class UpdateTimerService {

    @Autowired
    private RuntimeService runtimeService;

    public void executeUpdate(TimerEntity timerEntity){
        RuntimeServiceImpl rsi  = (RuntimeServiceImpl)runtimeService;
        CommandExecutor commandExecutor = rsi.getCommandExecutor();
        commandExecutor.execute(new UpdateTimerCommand(timerEntity));
    }


    public void modifyDuedate(Job job,Date duedate){
        if (job != null) {
            if (job instanceof TimerEntity) {
                TimerEntity timer = (TimerEntity) job;
                timer.setDuedate(duedate);
                executeUpdate(timer);
            }
        }
    }


    private final class UpdateTimerCommand implements Command<TimerEntity> {
        private final TimerEntity timerEntity;

        public UpdateTimerCommand(TimerEntity timerEntity) {
            this.timerEntity = timerEntity;
        }

        @Override
        public TimerEntity execute(CommandContext commandContext) {
            DbSqlSession dbsqlSession = commandContext.getDbSqlSession();
            String statement = dbsqlSession.getDbSqlSessionFactory()
                    .getUpdateStatement(timerEntity);
            dbsqlSession.getSqlSession().update(statement, timerEntity);
            return timerEntity;
        }
    }
}