时间：2022-11-19 10:51:12 | 栏目：.NET代码 | 点击：次
后台作业在系统开发的过程当中，是比较常用的功能。因为总是有一些长耗时的任务，而这些任务我们不是立即响应的，例如 Excel 文档导入、批量发送短信通知等。
ABP vNext 提供了后台作业的支持，并且还提供了对 HangFire 和 RabbitMQ 的后台作业集成。开发人员在使用这些第三方库的时候，基本就是开箱即用，不需要做其他复杂的配置。
ABP vNext 的实现就是在 CLR 的 Timer 之上封装了一层，周期性地执行用户逻辑。
ABP vNext 默认提供的 后台任务管理器，就是在后台作业基础之上进行的封装。
涉及到后台任务的模块一共有 6 个，它们分别是：
Hangfire 是一个开源的.NET任务调度框架，目前1.6+版本已支持.NET Core。个人认为它最大特点在于内置提供集成化的控制台，方便后台查看及监控。
引用
<PackageReference Include="Volo.Abp.AspNetCore.Mvc" Version="1.0.2" /> <PackageReference Include="Volo.Abp.Autofac" Version="1.0.2" /> <PackageReference Include="Hangfire" Version="1.7.7" /> <PackageReference Include="Hangfire.AspNetCore" Version="1.7.7" /> <PackageReference Include="Hangfire.Dashboard.BasicAuthorization" Version="1.0.2" /> <PackageReference Include="Hangfire.Redis.StackExchange.StrongName" Version="1.7.0" />
启动
public class Startup
{
public void ConfigureServices(IServiceCollection services)
{
services.AddApplication();
var Configuration = services.GetConfiguration();
GlobalStateHandlers.Handlers.Add(new SucceededStateExpireHandler(int.Parse(Configuration["Hangfire:JobExpirationTimeout"])));
services.AddHostedService();
services.AddHangfire(x =>
{
var connectionString = Configuration["Hangfire:Redis:ConnectionString"];
x.UseRedisStorage(connectionString, new RedisStorageOptions()
{
//活动服务器超时时间
InvisibilityTimeout = TimeSpan.FromMinutes(60),
Db = int.Parse(Configuration["Hangfire:Redis:Db"])
});
x.UseDashboardMetric(DashboardMetrics.ServerCount)
.UseDashboardMetric(DashboardMetrics.RecurringJobCount)
.UseDashboardMetric(DashboardMetrics.RetriesCount)
.UseDashboardMetric(DashboardMetrics.AwaitingCount)
.UseDashboardMetric(DashboardMetrics.EnqueuedAndQueueCount)
.UseDashboardMetric(DashboardMetrics.ScheduledCount)
.UseDashboardMetric(DashboardMetrics.ProcessingCount)
.UseDashboardMetric(DashboardMetrics.SucceededCount)
.UseDashboardMetric(DashboardMetrics.FailedCount)
.UseDashboardMetric(DashboardMetrics.EnqueuedCountOrNull)
.UseDashboardMetric(DashboardMetrics.FailedCountOrNull)
.UseDashboardMetric(DashboardMetrics.DeletedCount);
});
}
public void Configure(IApplicationBuilder app, IConfiguration Configuration)
{
app.InitializeApplication();
app.UseAuthorization();
var filter = new BasicAuthAuthorizationFilter(new BasicAuthAuthorizationFilterOptions
{
SslRedirect = false,
RequireSsl = false,
LoginCaseSensitive = false,
Users = new[]
{
new BasicAuthAuthorizationUser
{
Login = Configuration["Hangfire:Login"] ,
PasswordClear= Configuration["Hangfire:PasswordClear"]
}
}
});
app.UseHangfireDashboard("", new DashboardOptions
{
Authorization = new[]
{
filter
},
});
var jobOptions = new BackgroundJobServerOptions
{
Queues = new[] { "critical", "test", "default" },
WorkerCount = Environment.ProcessorCount * int.Parse(Configuration["Hangfire:ProcessorCount"]),
ServerName = Configuration["Hangfire:ServerName"],
SchedulePollingInterval = TimeSpan.FromSeconds(1), //计划轮询间隔 支持任务到秒
};
app.UseHangfireServer(jobOptions);
}
}
设置
///
/// 已完成的job设置过期，防止数据无限增长
///
public class SucceededStateExpireHandler : IStateHandler
{
public TimeSpan JobExpirationTimeout;
public SucceededStateExpireHandler(int jobExpirationTimeout)
{
JobExpirationTimeout = TimeSpan.FromMinutes(jobExpirationTimeout);
}
public string StateName => SucceededState.StateName;
public void Apply(ApplyStateContext context, IWriteOnlyTransaction transaction)
{
context.JobExpirationTimeout = JobExpirationTimeout;
}
public void Unapply(ApplyStateContext context, IWriteOnlyTransaction transaction)
{
}
}