开源分布式Job系统,调度与业务分离-HttpJob.Agent组件介绍以及如何使用

项目介绍：

Hangfire：是一个开源的job调度系统,支持分布式JOB！！

Hangfire.HttpJob 是我针对Hangfire开发的一个组件,该组件和Hangfire本身是独立的。可以独立更新Hangfire版本不影响！

该组件已被Hangfire官方采纳，在Hangfire官网可以查到：

开源地址：

https://github.com/yuzd/Hangfire.HttpJob

该项目目的是：

剥离Job调度和业务

Hangfire.HttpJob究竟是干嘛的

• 传统使用Hangfire都是把JOb的处理逻辑代码写在和Hangfire的同一个工程！
• 缺点： 这样就耦合在了一起，如果业务线增大，会导致每个业务线的Job处理逻辑都得和Hangfire耦合在一起！发布的时候所有业务线Job都得暂停调度
• 而使用了Hangfire.HttpJob的话 就是把Hangfire的服务拓展成可以把Job的处理逻辑代码写在别的工程里面(以webapi的形式暴露给Hangfire去调度)
• 优点：这样就解耦了Hangfire和业务处理逻辑，业务job开发者可以忽略Hangfire的存在！不同的业务线分开不同的JobAgent可以分别部署，发布互不影响

Hangfire.HttpJob

是对Hangfire的一个扩展插件，利用Hangfire.HttpJob可以快速搭建分部署Job调度Server。

特点是：

1. 业务与调度完全分离。
2. 支持定点执行 延迟执行 周期性循环执行，支持秒级别
3. 配合JobAgent组件可以实现Job管理 监控 日志等

共有三篇文章

开源分布式Job系统,调度与业务分离-如何创建一个计划httpjob任务

开源分布式Job系统,调度与业务分离-如何创建周期性的HttpJob任务

开源分布式Job系统,调度与业务分离-HttpJob.Agent组件介绍以及如何使用

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本篇教程：HttpJob.Agent组件介绍以及如何使用

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HttpJob.Agent是什么？

是一个基于netcore web的一个中间件，专门用于配合Hangfire.HttpJob 开发HttpJob的组件

NUGET地址：Install-Package Hangfire.HttpJob.Agent

帮助快速创建HttpJob并有以下特色

1. job的调度和业务完全分离
2. 可以在hangfire的后台进行添加变成一个HttpJob
3. 支持在hangfire后台手动发送该job 执行命令 和 停止命令
4. 支持 长时间运行

如何使用

JobAgent 是作为一个中间件来使用的 DEMO 可以查看 https://github.com/yuzd/Hangfire.HttpJob/tree/master/Test/TestHangfireAgent

JobAgent：一个JobAgent表示一个App 通过netcore web形式部署，一个JobAgent可以宿主多个Job

Job:表示单个Job，用于处理特定的业务逻辑

1.创建一个netcore的web空的工程

安装nuget包

这里我也用NLOG组件来记录日志： 所以也安装下Nlog的包： NLog.Extensions.Logging

新增一个Nlog.config文件，可以参考 https://github.com/yuzd/Hangfire.HttpJob/blob/master/Test/TestHangfireAgent/NLog.Config

配置startup

在appsettings.json里面配置JobAgent的启动参数

参数说明

字段名称	备注
Enabled	代表是否启用JobAgent
SitemapUrl	代表JobAgent的请求地址 默认"/jobagent"
EnabledBasicAuth	代表是否开启basicAuth认证 如果true 需要设置下面2个参数
BasicUserName	basicAuth认证的用户名
BasicUserPwd	basicAuth认证的密码

AgentJob 分下面两种

1. 单例的Job ===> 指的是在Agent运行期间只会存在一个实例 如果该实例没有执行完毕 是不允许再次执行的
2. 多例的Job ===> 每次执行都会新生成一个实例

PS：Job类都是注册在Netcore 的 DI容器里面的，所以可以在job类的构造方法 注入你想要的类，比如Logger组件

开始写job了

1. 写一个最简单的job

新建一个cs 叫 TestJob.cs

让它继承 JobAgent 并且重写 下面3个方法

• OnStart
• OnStop
• OnException

特别说明： OnStart方法在被执行的时候是在一个独立的线程执行的，所以能够执行长时间的任务

默认注册的单例JOB，下面会有多例的举例

2. 注册到Hangfire里面去

# 特别要注意的以下几个参数
1. Url 要填 Agent的注册地址 “/jobagent”
2. BasicUserName 和 BasicPassword 要填 Agent的配置的basicAuth
3. AgentClass 要填你添加的job类的完整名称
4. DelayFromMinutes这里我们填-1 代表必须手动执行 如果填0代表是立即执行 如果填>1 代表延迟分钟数

# 那么对应如下填写：

{
  "JobName": "TestJob",                     //Job名称
  "Method": "POST",                         //http请求的方法
  "ContentType": "application/json",        //http参数类型
  "Url": "http://localhost:5002/jobagent",  //Agent的注册地址
  "DelayFromMinutes": -1,                   //-1代表必须手动启动
  "Data": "",
  "Timeout": 5000,                          //http调用超时设置
  "BasicUserName": "test",                  //Agent设置的basicAuth
  "BasicPassword": "123456",                //Agent设置的basicAuth
  "EnableRetry": false,
  "SendSucMail": false,
  "SendFaiMail": true,                      //http失败时发邮件通知
  "Mail": "1877682825@qq.com",              //http调用失败通知我
  "AgentClass": "TestHangfireAgent.Jobs.TestJob,TestHangfireAgent"
}

添加成功后可以在job列表查到

1. 由于我刚刚添加设置的是DelayFromMinutes：-1 所以【队列】这里显示【multiple】代表可以多次运行 并且 只能自己点击按钮执行
2. 由于我们填了AgentClass 这个属性，所以Hangfire会认为这个是一个AgentJob 在[作业]显示的名称里面会有 JobAgent的字样

如下图所示：

1. 手动触发试一试

可以填参数 也可以不填参数 这里我们测试就随便写

可以看到AgentJob的控制台看到 调用执行成功 参数也传的没问题

再回到Hangfire的后台看下调用的日志

注意：由于这个是一个单例的JOB，在Onstart方法里面我们 采用 await Task.Delay(1000 * 10); 延迟了10秒 所以如果你在这10秒内重复执行这个Job 会提示 这个Job正在running 不能重新启动！等OnStart方法执行完毕后这个job才能被再次调用

2. 创建一个多例的JOB

其实很简单 就是在类上面加一个[TransientJob]标签就变成多例了

如下图所示 我们创建一个测试多例的job：TestTransientJob.cs 然后在它的类上面打上一个[TransientJob]标签 如下图所示：

采用和上面一样的方式注册到Hangfire里面去！ 和上面单例的唯一区别就是 多例的Job 每次都是一个新的实例，不会判断你上一个实例有没有执行完.

3. 创建一个可以Hang住OnStart方法的Job

意思就是 Job在执行OnStart方法完成的时候 不去结束这个Job 而是Hang住。 和Console.ReadKey() 类似的感觉！！

等到收到OnStop命令才去终止这个Job。

常见使用场景：消息队列Client端处理

使用也很简单 在类上打一个标签[HangJobUntilStop(true)]即可

20190605追加一个用于JobAgent的记录log到hangfire 后台 Console 中间件

NUGET 地址： https://www.nuget.org/packages/Hangfire.HttpJob.Agent.MysqlConsole/

也是开源的 开源代码在：https://github.com/yuzd/Hangfire.HttpJob

这个中间件的目的是能让JobAgent 写log到hangfire的Console

如图： 

如何在JobAgent记录日志而且Hangfire后台能查到呢？

1. 首先引用上面的MysqlConsole中间件的NUGET包

2. 在application.json里面配置 

3. 在startUp.cs文件里面注册 

4. 在Job类里面使用 

注意说明：

如果你不注册使用MysqlConsole这个中间件的话，

那么默认的： jobContext.Console.WriteLine 方法 等于 _logger.LogInformation(message);