开源作业调度框架---Quartz

一个简单的例子
第一步，建立一个自己的Job

/// <summary>    /// This is just a simple job that says "Hello" to the world.    /// </summary>    /// <author>Bill Kratzer</author>    /// <author>Marko Lahma (.NET)</author>    public class HelloJob : IJob    {        private static ILog _log = LogManager.GetLogger(typeof(HelloJob));        /// <summary>         /// Empty constructor for job initialization        /// <para>        /// Quartz requires a public empty constructor so that the        /// scheduler can instantiate the class whenever it needs.        /// </para>        /// </summary>        public HelloJob()        {        }        /// <summary>         /// Called by the <see cref="IScheduler" /> when a        /// <see cref="ITrigger" /> fires that is associated with        /// the <see cref="IJob" />.        /// </summary>        public virtual void  Execute(IJobExecutionContext context)        {            // Say Hello to the World and display the date/time            _log.Info(string.Format("Hello World! - {0}", System.DateTime.Now.ToString("r")));        }

说明：首先我们创建一个任务/作业称为HelloJob，该任务继承与一个IJob接口，如下图所示，该接口只有一个方法

public interface IJob    {        /// <summary>        /// Called by the <see cref="IScheduler" /> when a <see cref="ITrigger" />        /// fires that is associated with the <see cref="IJob" />.        /// </summary>        /// <remarks>        /// The implementation may wish to set a  result object on the         /// JobExecutionContext before this method exits.  The result itself        /// is meaningless to Quartz, but may be informative to         /// <see cref="IJobListener" />s or         /// <see cref="ITriggerListener" />s that are watching the job's         /// execution.        /// </remarks>        /// <param name="context">The execution context.</param>        void Execute(IJobExecutionContext context);    }

我们在HelloJob里面具体的实现了这个接口方法，输出一个Hello World!
那么如何让自己定义的Job运行起来
第二步，把自己的job注册到框架当中。

public virtual void Run()        {            ILog log = LogManager.GetLogger(typeof (SimpleExample));            log.Info("------- Initializing ----------------------");            // First we must get a reference to a scheduler            ISchedulerFactory sf = new StdSchedulerFactory();            IScheduler sched = sf.GetScheduler();            log.Info("------- Initialization Complete -----------");            // computer a time that is on the next round minute            DateTimeOffset runTime = DateBuilder.EvenMinuteDate(DateTimeOffset.UtcNow);            log.Info("------- Scheduling Job  -------------------");            // define the job and tie it to our HelloJob class            IJobDetail job = JobBuilder.Create<HelloJob>()                .WithIdentity("job1", "group1")                .Build();            // Trigger the job to run on the next round minute            ITrigger trigger = TriggerBuilder.Create()                .WithIdentity("trigger1", "group1")                .StartAt(runTime)                .Build();            // Tell quartz to schedule the job using our trigger            sched.ScheduleJob(job, trigger);            log.Info(string.Format("{0} will run at: {1}", job.Key, runTime.ToString("r")));            // Start up the scheduler (nothing can actually run until the             // scheduler has been started)            sched.Start();            log.Info("------- Started Scheduler -----------------");            // wait long enough so that the scheduler as an opportunity to             // run the job!            log.Info("------- Waiting 65 seconds... -------------");            // wait 65 seconds to show jobs            Thread.Sleep(TimeSpan.FromSeconds(65));            // shut down the scheduler            log.Info("------- Shutting Down ---------------------");            sched.Shutdown(true);            log.Info("------- Shutdown Complete -----------------");        }

说明：首先从作业工厂获得了一个Scheduler对象(sched)，这个对象后面用于作业的具体调度。然后用了一个JobBuilder创造出了一个IJobDetail对象，看下面的代码可以知道，其实Build方法创造的是一个JobDetailImpl 对象，它继承自IJobDetail，主要是描述了Job的一些信息。比如：jobType这里就是“HelloJob”,key =

/// <summary>        /// Produce the <see cref="IJobDetail" /> instance defined by this JobBuilder.        /// </summary>        /// <returns>the defined JobDetail.</returns>        public IJobDetail Build()        {            JobDetailImpl job = new JobDetailImpl();            job.JobType = jobType;            job.Description = description;            if (key == null)            {                key = new JobKey(Guid.NewGuid().ToString(), null);            }            job.Key = key;            job.Durable = durability;            job.RequestsRecovery = shouldRecover;            if (!jobDataMap.IsEmpty)            {                job.JobDataMap = jobDataMap;            }            return job;        }

TriggerBuilder创建触发器。创建完触发器如何和我们的Job绑定呢，sched.ScheduleJob(job, trigger);这条语句完成了绑定。这样就完成了所有的工作。直接调用sched对象的start方法就会执行我们HelloJob中的Execute方法了。