南京公司网站建设怎么收费,网站图标文件下载,wordpress网站设密码,旅游网站建设成都跟[一线码农大佬]翻译的某技术文对个线最近看到一线码农大佬翻译的《如何在 ASP.NET Core 中使用 Quartz.NET 执行任务调度》#xff0c;行文思路#xff1a;安装Quartz.NETQuartz.NET 中的Job,triggers 和 Schedulers创建 Scheduler开启和停止 scheduler创建 job 工厂创建 J… 跟[一线码农大佬]翻译的某技术文对个线最近看到一线码农大佬翻译的《如何在 ASP.NET Core 中使用 Quartz.NET 执行任务调度》行文思路安装Quartz.NETQuartz.NET 中的Job,triggers 和 Schedulers创建 Scheduler开启和停止 scheduler创建 job 工厂创建 JobMetadata 存储你的 job 元数据不可否认一线大佬的翻译文还是相当精准的 但个人认为这篇文章的底稿有点硬输出并没有以一个流畅、直观的编码思路来讲述[如何在ASP.NET Core中使用Quartz.NET 执行定时任务]。尤其是下面这段想起我之前也写了《ASP.NET CoreQuartz.Net实现web定时任务》 文章以一个简单的定时任务讲述了Quartz.NET在ASP.NET Core中的应用思路遇河架桥,遇山开路。这里我要解释一下上图中为什么要自定义一个Job工厂先看下官方JobFactory的作用大意是说如果某触发器被触发该触发器关联的Job将被调度器上配置的JobFactory初始化Quartz.NET默认的SimpleJobFactory工厂类是利用反射无参构造函数构造出Job实例。翻源码//----------------选自Quartz.Simpl.SimpleJobFactory类-------------
using System;
using Quartz.Logging;
using Quartz.Spi;
using Quartz.Util;
namespace Quartz.Simpl
{/// summary /// The default JobFactory used by Quartz - simply calls /// see crefObjectUtils.InstantiateType{T} / on the job class./// /summary/// seealso crefIJobFactory //// seealso crefPropertySettingJobFactory //// authorJames House/author/// authorMarko Lahma (.NET)/authorpublic class SimpleJobFactory : IJobFactory{private static readonly ILog log LogProvider.GetLogger(typeof (SimpleJobFactory));/// summary/// Called by the scheduler at the time of the trigger firing, in order to/// produce a see crefIJob / instance on which to call Execute./// /summary/// remarks/// It should be extremely rare for this method to throw an exception -/// basically only the case where there is no way at all to instantiate/// and prepare the Job for execution. When the exception is thrown, the/// Scheduler will move all triggers associated with the Job into the/// see crefTriggerState.Error / state, which will require human/// intervention (e.g. an application restart after fixing whatever/// configuration problem led to the issue with instantiating the Job)./// /remarks/// param namebundleThe TriggerFiredBundle from which the see crefIJobDetail //// and other info relating to the trigger firing can be obtained./param/// param namescheduler/param/// returnsthe newly instantiated Job/returns/// throws SchedulerException if there is a problem instantiating the Job. /throwspublic virtual IJob NewJob(TriggerFiredBundle bundle, IScheduler scheduler){IJobDetail jobDetail bundle.JobDetail;Type jobType jobDetail.JobType;try{if (log.IsDebugEnabled()){log.Debug($Producing instance of Job {jobDetail.Key}, class{jobType.FullName});}return ObjectUtils.InstantiateTypeIJob(jobType);}catch (Exception e){SchedulerException se new SchedulerException($Problem instantiating class {jobDetail.JobType.FullName}, e);throw se;}}/// summary/// Allows the job factory to destroy/cleanup the job if needed. /// No-op when using SimpleJobFactory./// /summarypublic virtual void ReturnJob(IJob job){var disposable job as IDisposable;disposable?.Dispose();}}
}//------------------节选自Quartz.Util.ObjectUtils类-------------------------public static T InstantiateTypeT(Type type)
{if (type null){throw new ArgumentNullException(nameof(type), Cannot instantiate null);}ConstructorInfo ci type.GetConstructor(Type.EmptyTypes);if (ci null){throw new ArgumentException(Cannot instantiate type which has no empty constructor, type.Name);}return (T) ci.Invoke(new object[0]);
}
但是很多情况下我们定义的Job很可能依赖第三方服务就比如一线大佬文中NotificationJob依赖了ILoggerNotificationJob 服务。这样默认的SimpleJobFactory不能满足实例化要求 考虑将Job任务作为依赖注入组件加入依赖注入容器。关键思路IScheduler 开放了JobFactory 属性便于你应用自定义的Job工厂在自定义Job工厂中使用ASP.NET Core依赖注入容器IServiceProvider解析出特定的Job。JobFactories may be of use to those wishing to have their application produce IJob instances via some special mechanism, such as to give the opportunity for dependency injection这才有一线码农大佬原文 [创建Job工厂类]动作的由来, 知其然更知其所以然如有勘误欢迎留言赐教。Reference: ASP.NET CoreQuartz.Net实现web定时任务
