Hangfire.Oracle.Core Implementation

Hangfire.Oracle.Core is based on Hangfire.MySqlStorage(https://github.com/arnoldasgudas/Hangfire.MySqlStorage)

I fixed some bugs and support .net standard 2.0.

Oracle 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.

Some features of Oracle storage implementation is under development!

Installation

Install Oracle

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

Install-Package Hangfire.Oracle.Core

Usage

Use one the following ways to initialize OracleStorage:

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

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

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

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

With version 1.1 you can provide your own connection factory.

GlobalConfiguration.Configuration.UseStorage(
    new OracleStorage(
        () => new OracleConnection(connectionString), 
        new OracleStorageOptions
        {
            SchemaName = "HANGFIRE"
        }));

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. Default is empty

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

Dashboard

Hangfire provides a dashboard More info: Hangfire Overview

Build

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

Known Issues

Currently Install.sql is not deployed if DB objects are not existing. As a workaround run your scripts in database and give give CRUD grants to the user that is given in connection string.