任务调度及远端管理（基于Quartz.net）

这篇文章我们来了解一些项目中的一个很重要的功能：任务调度

可能有些同学还不了解这个，其实简单点说任务调度与数据库中的Job是很相似的东西

只不过是运行的物理位置与管理方式有点不一样，从功能上来说我觉得还是差不多的，

存储过程有很大的局限性，耦合性也太高，所以最好把系统的一些Job放在代码层，

于是就有了Quartz.net，我们本篇就是针对Quartz.net的二次开发

一、新建HelloJob

HelloJob.cs，示例Job，每次执行都输出msg变量中的信息

 using Common.Logging;
 using Quartz;

 namespace Job.Items
 {
     public class HelloJob : IJob
     {
         public const string Message = "msg";
         private static readonly ILog log = LogManager.GetLogger(typeof(HelloJob));

         public virtual void Execute(IJobExecutionContext context)
         {
             var jobKey = context.JobDetail.Key;
             var message = context.JobDetail.JobDataMap.GetString(Message);
             log.InfoFormat("HelloJob: msg: {0}", message);
         }
     }
 }

HelloJobExample.cs，每5秒执行一次

         public class HelloJobExample
         {
             public virtual void Run()
             {
                 ISchedulerFactory sf = new StdSchedulerFactory();
                 IScheduler sched = sf.GetScheduler();

                 IJobDetail job = JobBuilder.Create<HelloJob>()
                     .WithIdentity("job1", "group1")
                     .Build();

                 JobDataMap map = job.JobDataMap;
                 map.Put("msg", "Your remotely added job has executed!");

                 ITrigger trigger = TriggerBuilder.Create()
                     .WithIdentity("trigger1", "group1")
                     .ForJob(job.Key)
                     .WithCronSchedule("/5 * * ? * *")
                     .Build();

                 sched.ScheduleJob(job, trigger);
                 sched.Start();
             }
         }

好了，有效代码就那么多，我们来试试

     class Program
     {
         static void Main(string[] args)
         {
             var example = new HelloJobExample();
             example.Run();

             Console.ReadKey();
         }
     }

貌似没什么问题，如愿地执行了。

但是我们想想，实际运行中执行任务的服务器一般都是独立出来的，那怎么去管理这些任务的开启、关闭及暂停呢？

肯定不能每次手动去操作，那太麻烦了。我们的希望是在应用中（系统管理后台）去管理这些任务。万幸Quartz.net足够强大，

他是支持远程操作的，没有太深入了解，不过看调用参数应该是通过TCP请求进行操作的，我们试试看

二、Job远程管理

2.1、新建Job.Items项目，把之前新建的HelloJob.cs放在其中

2.2、新建Job.Server项目

新建RemoteServer.cs

     public class RemoteServer : ILjrJob
     {
         public string Name
         {
             get { return GetType().Name; }
         }

         public virtual void Run()
         {
             ILog log = LogManager.GetLogger(typeof(RemoteServer));

             NameValueCollection properties = new NameValueCollection();
             properties["quartz.scheduler.instanceName"] = "RemoteServer";
             properties["quartz.threadPool.type"] = "Quartz.Simpl.SimpleThreadPool, Quartz";
             properties["quartz.threadPool.threadCount"] = "";
             properties["quartz.threadPool.threadPriority"] = "Normal";
             properties["quartz.scheduler.exporter.type"] = "Quartz.Simpl.RemotingSchedulerExporter, Quartz";
             properties["quartz.scheduler.exporter.port"] = "";
             properties["quartz.scheduler.exporter.bindName"] = "QuartzScheduler";
             properties["quartz.scheduler.exporter.channelType"] = "tcp";
             properties["quartz.scheduler.exporter.channelName"] = "httpQuartz";
             properties["quartz.scheduler.exporter.rejectRemoteRequests"] = "true";
          }
     }

2.3、新建控制器HelloJobController

     public class HelloJobController : Controller
     {
         public ActionResult Index()
         {
             try
             {
                 if (HelloJobHelper.Trigger != null)
                 {
                     ViewBag.JobKey = "remotelyAddedJob";
                     ViewBag.State = HelloJobHelper.Scheduler.GetTriggerState(HelloJobHelper.Trigger.Key);
                     ViewBag.StartTime = HelloJobHelper.Trigger.StartTimeUtc.ToString();
                 }
                 else
                 {
                     ViewBag.State = "获取Job执行状态失败";
                 }
             }
             catch (Exception ex)
             {
                 ViewBag.State = "Job服务器连接失败";
             }

             return View();
         }
         public ActionResult Run()
         {
             HelloJobHelper.RunJob();

             return RedirectToAction("Index", "HelloJob");
         }
         public ActionResult Pause()
         {
             HelloJobHelper.PauseJob();

             return RedirectToAction("Index", "HelloJob");
         }
         public ActionResult Resume()
         {
             HelloJobHelper.ResumeJob();
             return RedirectToAction("Index", "HelloJob");
         }
     }

2.4、新建HelloJobHelper

先配置连接远端任务服务器的参数，这个要和上面的RemoteServer.cs对应

1             properties["quartz.scheduler.proxy"] = "true";
2             properties["quartz.scheduler.proxy.address"] = "tcp://127.0.0.1:555/QuartzScheduler";

我们来看看开始操作，运行这个方法，任务服务器将自动开启这个Job

         public static void RunJob()
         {
             if (!scheduler.CheckExists(jobKey))
             {
                 IJobDetail job = JobBuilder.Create<HelloJob>()
                     .WithIdentity(jobKey)
                     .Build();

                 JobDataMap map = job.JobDataMap;
                 map.Put("msg", "Your remotely added job has executed!");

                 ITrigger trigger = TriggerBuilder.Create()
                     .WithIdentity(triggerKey)
                     .ForJob(job.Key)
                     .WithCronSchedule("/5 * * ? * *")
                     .Build();

                 scheduler.ScheduleJob(job, trigger);

                 JobDetail = job;
                 Trigger = trigger;
             }
         }

暂停比较简单

         public static void PauseJob()
         {
             scheduler.PauseJob(jobKey);
         }

2.5、View

 @{
     ViewBag.Title = "Index";
     Layout = "~/Views/Shared/_Bootstrap.cshtml";
 }

 <!DOCTYPE html>

 <html>
 <head>
     <meta name="viewport" content="width=device-width" />
     <title>Index</title>
     <style>
         .col-sm-offset-2 {
         margin-left:20px;
         }
     </style>
 </head>
 <body>
     <br />
     @using (Html.BeginForm("Run", "HelloJob", null, FormMethod.Post, new { @id = "form1", @class = "form-horizontal", role = "form" }))
     {
         @Html.AntiForgeryToken()
         <div class="form-group">
             <div class="col-sm-offset-2 col-sm-10">
                 <input type="hidden" name="Id" id="Id" />
                 <button type="submit" class="btn btn-default">Run</button>
             </div>
         </div>
     }

     @using (Html.BeginForm("Pause", "HelloJob", null, FormMethod.Post, new { @id = "form2", @class = "form-horizontal", role = "form" }))
     {
         @Html.AntiForgeryToken()
         <div class="form-group">
             <div class="col-sm-offset-2 col-sm-10">
                 <input type="hidden" name="Id" id="Id" />
                 <button type="submit" class="btn btn-default">Pause</button>
             </div>
         </div>
     }

     @using (Html.BeginForm("Resume", "HelloJob", null, FormMethod.Post, new { @id = "form3", @class = "form-horizontal", role = "form" }))
     {
         @Html.AntiForgeryToken()
         <div class="form-group">
             <div class="col-sm-offset-2 col-sm-10">
                 <input type="hidden" name="Id" id="Id" />
                 <button type="submit" class="btn btn-default">Resume</button>
             </div>
         </div>
     }

     <br />
     <div>
         <ul>
             <li>ViewBag.JobKey: @ViewBag.JobKey</li>
             <li>ViewBag.State: @ViewBag.State</li>
             <li>ViewBag.StartTime: @ViewBag.StartTime</li>
             <li>ViewBag.ExecuteTimes: @ViewBag.ExecuteTimes</li>
         </ul>
     </div>

 </body>
 </html>

2.6 好了，我们先运行服务端，开起来就好了

2.7、运行Web

2.7.1 点击Run

2.7.2、点击Pause（暂停）

2.7.3、点击Resume（恢复）

2.8、最后看看项目代码层次，涉及3个：MVC、Job.Items、Job.Server

好了，基本的功能有了。这篇就到这里