【源码笔记】Nop定时任务

网站需要定时执行不同的任务，比如清理无效的数据、定时发送mail等，Nop的这个定时任务设计比较好，简单的说就是将所有任务相同的属性持久化，具体的执行通过继承接口来实现。

持久化对象：ScheduleTask

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ScheduleTask定义了Seconds，Type等属性，分别记录执行周期和任务类型。

public class ScheduleTask:BaseEntity
    {
       public string Name { get; set; }
       /// <summary>
       /// Gets or sets the run period (in seconds)
       /// </summary>
       public int Seconds { get; set; }

       /// <summary>
       /// Gets or sets the type of appropriate ITask class
       /// </summary>
       public string Type { get; set; }

       /// <summary>
       /// Gets or sets the value indicating whether a task is enabled
       /// </summary>
       public bool Enabled { get; set; }

       /// <summary>
       /// Gets or sets the value indicating whether a task should be stopped on some error
       /// </summary>
       public bool StopOnError { get; set; }

       /// <summary>
       /// Gets or sets the machine name (instance) that leased this task. It's used when running in web farm (ensure that a task in run only on one machine). It could be null when not running in web farm.
       /// </summary>
       public string LeasedByMachineName { get; set; }
       /// <summary>
       /// Gets or sets the datetime until the task is leased by some machine (instance). It's used when running in web farm (ensure that a task in run only on one machine).
       /// </summary>
       public DateTime? LeasedUntilTime { get; set; }

       /// <summary>
       /// Gets or sets the datetime when it was started last time
       /// </summary>
       public DateTime? LastStartTime { get; set; }
       /// <summary>
       /// Gets or sets the datetime when it was finished last time (no matter failed ir success)
       /// </summary>
       public DateTime? LastEndTime { get; set; }
       /// <summary>
       /// Gets or sets the datetime when it was sucessfully finished last time
       /// </summary>
       public DateTime? LastSuccessTime { get; set; }
    }

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