.net core中Quartz的使用方法

我们在日常开发中，总会遇到这样的需求：每隔一段时间，执行一次某个任务。固定某个时间执行任务，例如凌晨12点对当天的数据进行统计。每个月的第几天，执行某个任务。

Quartz.Net是根据Java的Quartz用C#改写而来，Quartz.NET是一个开源的作业调度框架，非常适合在平时的工作中，定时轮询数据库同步，定时邮件通知，定时处理数据等。Quartz.NET允许开发人员根据时间间隔来调度作业。.

Quartz版本：3.3.2

1.NuGet中下载安装Quartz

2.新建Quartz帮助类

(1)新建JobSchedule类

public class JobSchedule
    {
        public JobSchedule(Type jobType, string cronExpression)
        {
            JobType = jobType;
            CronExpression = cronExpression;
        }

        public Type JobType { get; }
        public string CronExpression { get; }

新建QuartzFactory类

public class QuartzFactory : IJobFactory
    {
        private readonly IServiceProvider _serviceProvider;

        public QuartzFactory(IServiceProvider serviceProvider)
        {
            _serviceProvider = serviceProvider;
        }

        public IJob NewJob(TriggerFiredBundle bundle, IScheduler scheduler)
        {
            return _serviceProvider.GetRequiredService(bundle.JobDetail.JobType) as IJob;
        }

        public void ReturnJob(IJob job)
        { }

新建QuartzService类


public class QuartzHostedService : IHostedService
    {
        private readonly ISchedulerFactory _schedulerFactory;
        private readonly IJobFactory _jobFactory;
        private readonly IEnumerable<JobSchedule> _jobSchedules;

        public QuartzHostedService(
            ISchedulerFactory schedulerFactory,
            IJobFactory jobFactory,
            IEnumerable<JobSchedule> jobSchedules)
        {
            _schedulerFactory = schedulerFactory;
            _jobSchedules = jobSchedules;
            _jobFactory = jobFactory;
        }

        public IScheduler Scheduler { get; set; }

        public async Task StartAsync(CancellationToken cancellationToken)
        {
            Scheduler = await _schedulerFactory.GetScheduler(cancellationToken);
            Scheduler.JobFactory = _jobFactory;

            foreach (var jobSchedule in _jobSchedules)
            {
                var job = CreateJob(jobSchedule);
                var trigger = CreateTrigger(jobSchedule);

                await Scheduler.ScheduleJob(job, trigger, cancellationToken);
            }

            await Scheduler.Start(cancellationToken);
        }

        public async Task StopAsync(CancellationToken cancellationToken)
        {
            await Scheduler?.Shutdown(cancellationToken);
        }

        private static IJobDetail CreateJob(JobSchedule schedule)
        {
            var jobType = schedule.JobType;
            return JobBuilder
                .Create(jobType)
                .WithIdentity(jobType.FullName)
                .WithDescription(jobType.Name)
                .Build();
        }

        private static ITrigger CreateTrigger(JobSchedule schedule)
        {
            return TriggerBuilder
                .Create()
                .WithIdentity($"{schedule.JobType.FullName}.trigger")
                .WithCronSchedule(schedule.CronExpression)
                .WithDescription(schedule.CronExpression)
                .Build();
        }
    }

在Startup.cs中注册代码

services.AddControllers();
#region Quartz Service

// Add Quartz services
services.AddSingleton<IJobFactory, QuartzFactory>();
services.AddSingleton<ISchedulerFactory, StdSchedulerFactory>();
// Add our job
services.AddTransient<DeleteFileJob>();
services.AddJob();
services.AddHostedService<QuartzHostedService>();

Quartz.Net源码：

https://github.com/quartznet/quartznet

官方学习文档：

http://www.quartz-scheduler.net/documentation/index.html

董川民