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scheduler's Introduction

scheduler

任务调度层级结构:

scheduler:
    job: 
        trigger:
        
scheduler -> job  1 -> n
job -> trigger    1 -> n

一个scheduler中管理多个job
一个job可以配置多个trigger

自定义job需要继承 JobContext 抽象类,并且添加 @SchedulerJob 注解

queryJobParamList:
    查询该job下配置的所有 trigger 配置
queryJobParam
    抽象类中有默认实现 可以重写覆盖 用于在手动触发任务时 对 trigger 定位

以下三个方法默认实现为 do nothing
    jobToBeExecuted
        当任务被触发时 执行
    jobExecutionVetoed  
        当任务执行异常时 执行
    jobWasExecuted   
        当任务执行完成时 执行

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