Question

我有一个项目，我使用TopShelf和TopShelf.Quartz

关注this example我正在用

建立自己的工作

                s.ScheduleQuartzJob(q =>
                    q.WithJob(() => JobBuilder.Create<MyJob>().Build())
                    .AddTrigger(() => TriggerBuilder.Create()
                        .WithSimpleSchedule(builder => builder
                            .WithIntervalInSeconds(5)
                            .RepeatForever())
                        .Build())
                );

即使前一个仍然在运行，它每五秒触发一次我的工作。我真正想要的是开始一份工作，完成后等待五秒钟然后重新开始。这是可能的还是我必须实现自己的逻辑（例如通过静态变量）。

Answer 1

您可以使用TriggerListener（http://www.quartz-scheduler.net/documentation/quartz-2.x/tutorial/trigger-and-job-listeners.html）在触发器完成时收听，然后在5秒内重新安排。

另一种选择是将下一个作业安排为作业执行中的最终操作。

http://www.quartz-scheduler.net/documentation/faq.html在某个地方有一个问题，其中有两分之二可以解释它。

Answer 2

@NateKerkhofs提议的工作听众将会这样工作：

public class RepeatAfterCompletionJobListener : IJobListener
{
    private readonly TimeSpan interval;

    public RepeatAfterCompletionJobListener(TimeSpan interval)
    {
        this.interval = interval;
    }

    public void JobExecutionVetoed(IJobExecutionContext context)
    {
    }

    public void JobToBeExecuted(IJobExecutionContext context)
    {
    }

    public void JobWasExecuted(IJobExecutionContext context, JobExecutionException jobException)
    {
       string triggerKey = context.JobDetail.Key.Name + ".trigger";

        var trigger = TriggerBuilder.Create()
                .WithIdentity(triggerKey)
                .StartAt(new DateTimeOffset(DateTime.UtcNow.Add(interval)))
                .Build();

        context.Scheduler.RescheduleJob(new TriggerKey(triggerKey), trigger);
    }

    public string Name
    {
        get
        {
            return "RepeatAfterCompletionJobListener";
        }
    }
}

然后将监听器添加到调度程序：

var jobKey = "myJobKey";
var schedule = new StdSchedulerFactory().GetScheduler();
listener = new
   RepeatAfterCompletionJobListener(TimeSpan.FromSeconds(5));

schedule.ListenerManager.AddJobListener
         (listener, KeyMatcher<JobKey>.KeyEquals(new JobKey(jobKey)));

var job = JobBuilder.Create(MyJob)
                .WithIdentity(jobKey)
                .Build();

// Schedule the job to start in 5 seconds to give the service time to initialise
var trigger = TriggerBuilder.Create()
                .WithIdentity(CreateTriggerKey(jobKey))
                .StartAt(DateTimeOffset.Now.AddSeconds(5))
                .Build();

schedule.ScheduleJob(job, trigger);

不幸的是我不知道如何使用Typshelf.Quartz库使用的流畅语法（或者如果可以的话），我使用它与TopShelf和常规Quartz.Net。

Answer 3

JobListener解决方案是一种非常强大且灵活的方式，可在完成后重新安排作业。感谢Nate Kerkhofs和stuartd的投入。

在我的情况下，使用DisallowConcurrentExecution属性装饰我的Job类就足够了，因为我没有不同的工作实例

[DisallowConcurrentExecution]
public class MyJob : IJob
{
}

仅供参考：将JobListerener与TopShelf.Quartz一起使用，代码可能如下所示

var jobName = "MyJob";
var jobKey = new JobKey(jobName);

s.ScheduleQuartzJob(q =>
           q.WithJob(() => JobBuilder.Create<MyJob>()
                .WithIdentity(jobKey).Build())
            .AddTrigger(() => TriggerBuilder.Create()
                .WithSimpleSchedule(builder => builder
                    .WithIntervalInSeconds(5)
                .Build())

var listener = new RepeatAfterCompletionJobListener(TimeSpan.FromSeconds(5));
var listenerManager = ScheduleJobServiceConfiguratorExtensions
      .SchedulerFactory().ListenerManager;
listenerManager.AddJobListener(listener, KeyMatcher<JobKey>.KeyEquals(jobKey));

如果您使用的是TopShelf.Quartz.Ninject（就像我一样），请勿在致电UseQuartzNinject()之前忘记致电ScheduleJobServiceConfiguratorExtensions.SchedulerFactory()

Answer 4

我发现的最好方法是添加简单的Job Listener。在我的示例中，它在失败后立即重新计划作业。当然，您可以在.StartAt(DateTime.UtcNow)

中添加延迟

public class QuartzRetryJobListner : IJobListener
{
    public string Name => GetType().Name;
    public async Task JobExecutionVetoed(IJobExecutionContext context, CancellationToken cancellationToken = default) => await Task.CompletedTask;
    public async Task JobToBeExecuted(IJobExecutionContext context, CancellationToken cancellationToken = default) => await Task.CompletedTask;


    public async Task JobWasExecuted(
        IJobExecutionContext context,
        JobExecutionException jobException,
        CancellationToken cancellationToken = default)
    {
        if (jobException == null) return;

        // Create and schedule new trigger
        ITrigger retryTrigger = TriggerBuilder.Create()
             .StartAt(DateTime.UtcNow)
             .Build();

        await context.Scheduler.ScheduleJob(context.JobDetail, new[] { retryTrigger }, true);
    }
}

此外，我认为添加类扩展很有用

public static class QuartzExtensions
{
    public static void RepeatJobAfterFall(this IScheduler scheduler, IJobDetail job)
    {
        scheduler.ListenerManager.AddJobListener(
            new QuartzRetryJobListner(),
            KeyMatcher<JobKey>.KeyEquals(job.Key));
    }
}

只是为了简化用法。

_scheduler.ScheduleJob(job, trigger);
//In case of failue repeat job immediately
_scheduler.RepeatJobAfterFall(job);

如何强制quartz.net作业在完成后重新启动intervall

4 个答案: