Hangfire.DMStorage

中文

Hangfire.DMStorage is an extension component that provides support for Hangfire to use the Dameng database.

Dameng storage implementation of Hangfire- fire-and-forget, delayed and recurring tasks runner for .NET. Scalable and reliable background job runner. Supports multiple servers, CPU and I/O intensive, long-running and short-running jobs.

Installation

Install Hangfire.DMStorage

Run the following command in the NuGet Package Manager console to install Hangfire.DMStorage:

Install-Package DMStorage.Hangfire

Usage

Use one the following ways to initialize DMStorage:

• Create new instance of DMStorage with connection string constructor parameter and pass it to Configuration with UseStorage method:

  GlobalConfiguration.Configuration.UseStorage(
    new DMStorage(connectionString));

• Alternatively one or more options can be passed as a parameter to DMStorage:

GlobalConfiguration.Configuration.UseStorage(
    new DMStorage(
        connectionString, 
        new DMStorageOptions
        {
            TransactionIsolationLevel =IsolationLevel.ReadCommitted,
            QueuePollInterval = TimeSpan.FromSeconds(15),
            JobExpirationCheckInterval = TimeSpan.FromHours(1),
            CountersAggregateInterval = TimeSpan.FromMinutes(5),
            PrepareSchemaIfNecessary = true,
            DashboardJobListLimit = 50000,
            TransactionTimeout = TimeSpan.FromMinutes(1),
            SchemaName= "SYSDBA"
        }));

Use in Hangfire.HttpJob

     context.Services.AddHangfire(x => x.UseStorage(new DMStorage(connectionString, new DMStorageOptions()
            {
                TransactionIsolationLevel = System.Data.IsolationLevel.ReadCommitted,
                QueuePollInterval = TimeSpan.FromSeconds(15),
                JobExpirationCheckInterval = TimeSpan.FromHours(1),
                CountersAggregateInterval = TimeSpan.FromMinutes(5),
                PrepareSchemaIfNecessary = true,
                DashboardJobListLimit = 50000,
                TransactionTimeout = TimeSpan.FromMinutes(1),
                SchemaName = "SYSDBA"
            }))
            .UseConsole()
            .UseHangfireHttpJob());

Description of optional parameters:

• TransactionIsolationLevel - transaction isolation level. Default is read committed. Didn't test with other options!
• QueuePollInterval - job queue polling interval. Default is 15 seconds.
• JobExpirationCheckInterval - job expiration check interval (manages expired records). Default is 1 hour.
• CountersAggregateInterval - interval to aggregate counter. Default is 5 minutes.
• PrepareSchemaIfNecessary - if set to true, it creates database tables. Default is true.
• DashboardJobListLimit - dashboard job list limit. Default is 50000.
• TransactionTimeout - transaction timeout. Default is 1 minute.
• SchemaName - schema name.

How to limit number of open connections

Number of opened connections depends on Hangfire worker count. You can limit worker count by setting WorkerCount property value in BackgroundJobServerOptions:

app.UseHangfireServer(
   new BackgroundJobServerOptions
   {
      WorkerCount = 1
   });

More info: http://hangfire.io/features.html#concurrency-level-control

Build

Please use Visual Studio or any other tool of your choice to build the solution.