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# PeriodicalExecutor设计
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# 添加任务
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* 当前没有未执行的任务
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* 添加并启动定时器
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* 已有未执行的任务
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* 添加并检查是否到达最大缓存数
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* 如到，执行所有缓存任务
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* 未到，只添加
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# 定时器到期
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* 清除并执行所有缓存任务
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* 再等待N个定时周期，如果等待过程中一直没有新任务，则退出
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