activiti 修改定时器的执行时间

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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. */@Componentpublic 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;        }    }}

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