using?System;
using?System.Threading;

namespace?CronJob
{
????public?interface?ICronJob
????{
????????void?Run（DateTime?dateTime）;
????????void?Abort（）;
????}
????public?class?CronJobbase?:?ICronJob
????{
????????private?readonly?object?_lock?=?new?object（）;
????????private?readonly?CronSchedule?_cronSchedule;
????????private?Thread?_thread;
????????public?CronJobbase（string?schedule）
????????{
????????????_cronSchedule?=?new?CronSchedule（schedule）;
????????}
????????public?void?Run（DateTime?dateTime）
????????{
????????????lock?（_lock）
????????????{
????????????????if?（!_cronSchedule.IsTime（dateTime））
????????????????????return;

????????????????if?（_thread!=?null?&&?_thread.ThreadState?==?ThreadState.Running）
????????????????????return;
????????????????_thread?=?new?Thread（ExecuteHandler）;
????????????????_thread.Start（）;
????????????}
????????}

????????public?void?Abort（）
????????{
????????????_thread.Abort（）;
????????}

????????private?void?ExecuteHandler（）
????????{
????????????try
????????????{
????????????????Execute（）;
????????????}
????????????catch?（Exception?ex）
????????????{
????????????????Console.WriteLine（“Error:“?ex）;
????????????}
????????}

????????protected?virtual?void?Execute（）
????????{

????????}
????}
}