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
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
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
- job的调度和业务完全分离
- 可以在hangfire的后台进行添加变成一个HttpJob
- 支持在hangfire后台手动发送该job 执行命令 和 停止命令
- 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
- 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
- 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": "[email protected]", //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
- 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
- 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： 
- 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
原文地址：https://www.cnblogs.com/yudongdong/p/10942128.html