Quartz.NET开源作业调度框架系列(五):AdoJobStore保存job到数据库

2019-11-14 13:42:47

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　　Quartz.NET 任务调度的核心元素是 scheduler, trigger 和 job，其中 trigger(用于定义调度时间的元素，即按照什么时间规则去执行任务) 和 job 是任务调度的元数据，scheduler 是实际执行调度的控制器。在Quartz.NET中主要有两种类型的 job：无状态的（stateless）和有状态的（stateful）。对于同一个 trigger 来说，有状态的 job 不能被并行执行，只有上一次触发的任务被执行完之后，才能触发下一次执行。无状态任务一般指可以并发的任务，即任务之间是独立的，不会互相干扰。一个 job 可以被多个 trigger 关联，但是一个 trigger 只能关联一个 job。某些任务需要对数据库中的数据进行增删改处理 , 这些任务不能并发执行，就需要用到无状态的任务 , 否则会造成数据混乱。

　　另外有些情况下,我们需要将任务保存到数据库中,特别是有些任务中包含参数,例如累加的任务,如果可以保存到数据库中,即便中间断电或者程序异常重启,中间计算的结果也不会丢失,可以从断点的结果进行运算(首先恢复任务),下面介绍一下如何用AdoJobStore将任务保存到SQL Server数据库中.

　　事先要在数据库上新建一个QRTZ_数据库,并执行SQL建表脚本:

1 RecoveryJob

　　是一个无状态的任务,代码如下:

 1 using System; 2 using System.Collections.Specialized; 3 using System.Threading; 4 using Common.Logging; 5 using Quartz; 6 using Quartz.Impl; 7 using Quartz.Job; 8 using System.Windows.Forms; 9 namespace  QuartzDemo10 {11     /// <summary>12     /// 无状态的可恢复的任务13     /// </summary>14     public class RecoveryJob : IJob15     {16        17         PRivate const string Count = "count";18         public virtual void Execute(IJobExecutionContext context)19         {20 21             JobKey jobKey = context.JobDetail.Key;22             if (isOpen("FrmConsole"))23             {24                 try25                 {26                     //获取当前Form1实例27                     __instance = (FrmConsole)application.OpenForms["FrmConsole"];28                     // 如果任务是恢复的任务的话29                     if (context.Recovering)30                     {31                         __instance.SetInfo(string.Format("{0} RECOVERING at {1}", jobKey, DateTime.Now.ToString("r")));32                     }33                     else34                     {35                         __instance.SetInfo(string.Format("{0} starting at {1}", jobKey, DateTime.Now.ToString("r")));36                     }37 38                     JobDataMap data = context.JobDetail.JobDataMap;39                     int count;40                     if (data.ContainsKey(Count))41                     {42                         //是否能从数据库中恢复,如果保存Job等信息的话,程序运行突然终端(可用调试时中断运行,而不是关闭窗体来模拟)43                         count = data.GetInt(Count);44                     }45                     else46                     {47                         count = 0;48                     }49                     count++;50                     data.Put(Count, count);51 52                     __instance.SetInfo(string.Format(" {0} Count #{1}", jobKey, count));53                 }54                 catch (Exception ex)55                 {56                     Console.WriteLine(ex.Message);57                 }58             }59         }60 61 62         private static FrmConsole __instance = null;63 64         /// <summary>65         /// 判断窗体是否打开66         /// </summary>67         /// <param name="appName"></param>68         /// <returns></returns>69         private bool isOpen(string appName)70         {71             FormCollection collection = Application.OpenForms;72             foreach (Form form in collection)73             {74                 if (form.Name == appName)75                 {76                     return true;77                 }78             }79             return false;80         }81 82     }83 }

2 RecoveryStatefulJob

　　是一个有状态的任务,和无状态的区别就是在任务类的上面用[PersistJobDataAfterExecution]标注任务是有状态的 , 有状态的任务不允许并发执行,也需要标注 [DisallowConcurrentExecution],代码如下:

 1 using System; 2 using System.Collections.Specialized; 3 using System.Threading; 4 using Common.Logging; 5 using Quartz; 6 using Quartz.Impl; 7 using Quartz.Job; 8 using System.Windows.Forms; 9 namespace  QuartzDemo10 {11     /// <summary>12     ///  用这个[PersistJobDataAfterExecution]标注任务是有状态的,13     ///  有状态的任务不允许并发执行 [DisallowConcurrentExecution]14     /// </summary>15     [PersistJobDataAfterExecution]16     [DisallowConcurrentExecution]17     public class RecoveryStatefulJob : RecoveryJob18     {19 20     }21 }

3 AdoJobStoreExample

　　用 properties["quartz.dataSource.default.connectionString"] = "Server=(local);Database=QRTZ_;Trusted_Connection=True;";定义了数据库的连接信息,程序运行时会自动将任务保存到数据库中:

  1 using System;  2 using System.Collections.Specialized;  3 using System.Threading;  4 using Common.Logging;  5 using Quartz;  6 using Quartz.Impl;  7 using Quartz.Job;  8 using System.Windows.Forms;  9 namespace QuartzDemo 10 { 11     /// <summary>  12     ///  AdoJobStore的用法示例 13     /// </summary> 14     public class AdoJobStoreExample  15     { 16         public virtual void Run(bool inClearJobs, bool inScheduleJobs) 17         { 18             NameValueCollection properties = new NameValueCollection(); 19  20             properties["quartz.scheduler.instanceName"] = "TestScheduler"; 21             properties["quartz.scheduler.instanceId"] = "instance_one"; 22             properties["quartz.threadPool.type"] = "Quartz.Simpl.SimpleThreadPool, Quartz"; 23             properties["quartz.threadPool.threadCount"] = "5"; 24             properties["quartz.threadPool.threadPriority"] = "Normal"; 25             properties["quartz.jobStore.misfireThreshold"] = "60000"; 26             properties["quartz.jobStore.type"] = "Quartz.Impl.AdoJobStore.JobStoreTX, Quartz"; 27             properties["quartz.jobStore.useProperties"] = "false"; 28             properties["quartz.jobStore.dataSource"] = "default"; 29             properties["quartz.jobStore.tablePrefix"] = "QRTZ_"; 30             properties["quartz.jobStore.clustered"] = "true"; 31             // SQLite 32             // properties["quartz.jobStore.lockHandler.type"] = "Quartz.Impl.AdoJobStore.UpdateLockRowSemaphore, Quartz"; 33             properties["quartz.jobStore.driverDelegateType"] = "Quartz.Impl.AdoJobStore.SqlServerDelegate, Quartz"; 34 　　　 // 数据库连接字符串 35             properties["quartz.dataSource.default.connectionString"] = "Server=(local);Database=QRTZ_;Trusted_Connection=True;"; 36             properties["quartz.dataSource.default.provider"] = "SqlServer-20"; 37  38             // First we must get a reference to a scheduler 39             ISchedulerFactory sf = new StdSchedulerFactory(properties); 40             IScheduler sched = sf.GetScheduler(); 41  42             bool b是否恢复 = false; 43             if (inClearJobs) 44             { 45                Console.WriteLine("***** Deleting existing jobs/triggers *****"); 46                // sched.Clear(); 47             } 48  49           50             if (inScheduleJobs) 51             { 52               53                 string schedId = sched.SchedulerInstanceId; 54  55                 int count = 1; 56  57                 //定义一个无状态的任务 58                 IJobDetail job = JobBuilder.Create<RecoveryJob>() 59                     .WithIdentity("recoveryjob_" + count, schedId)  60                     .RequestRecovery() //recovery 61                     .Build(); 62  63  64                 ISimpleTrigger trigger = (ISimpleTrigger)TriggerBuilder.Create() 65                                                               .WithIdentity("triger_" + count, schedId) 66                                                               .StartAt(DateBuilder.FutureDate(1, IntervalUnit.Second)) 67                                                               .WithSimpleSchedule(x => x.WithRepeatCount(20).WithInterval(TimeSpan.FromSeconds(3))) 68                                                               .Build(); 69                 //可用此来查看定义的触发器触发规则 70                 //log.InfoFormat("{0} will run at: {1} and repeat: {2} times, every {3} seconds",  71                 //job.Key, trigger.GetNextFireTimeUtc(),  72                 //trigger.RepeatCount,  73                 //trigger.RepeatInterval.TotalSeconds); 74                 try 75                 { 76                     //如果数据库已经存在同名job和trigger,则绑定失败 77                     sched.ScheduleJob(job, trigger); 78                 } 79                 catch 80                 { 81                     b是否恢复 = true; 82                 } 83                 count++; 84  85                 //定义一个有状态的任务*********************************************************** 86                 job = JobBuilder.Create<RecoveryStatefulJob>() 87                     .WithIdentity("Statefuljob_" + count, schedId) 88                     .RequestRecovery() // recovery 89                     .Build(); 90  91                 trigger = (ISimpleTrigger)TriggerBuilder.Create() 92                                                .WithIdentity("triger_" + count, schedId) 93                                                .StartAt(DateBuilder.FutureDate(1, IntervalUnit.Second)) 94                                                .WithSimpleSchedule(x => x.WithRepeatCount(20).WithInterval(TimeSpan.FromSeconds(3))) 95                                                .Build(); 96            97                 try 98                 { 99                     sched.ScheduleJob(job, trigger);100                 }101                 catch102                 {103                     b是否恢复 = true;104                 }105 106 107                108             }109         110             //启动111             sched.Start();112             //sched.Shutdown();113 114         }115 116         public string Name117         {118             get { return GetType().Name; }119         }120 121         public void Run()122         {123             bool clearJobs = true;124             //clearJobs = false;125             bool scheduleJobs = true;126             AdoJobStoreExample example = new AdoJobStoreExample();127             example.Run(clearJobs, scheduleJobs);128         }129     }130 }