Iwate.AzureFunctions.Middlewares.Singleton 1.0.0-preview.2

A singleton lib for dotnet-isolated of Azure Functions

How to Install

$ dotnet add package Iwate.AzureFunctions.Middlewares.Singleton

How to Use

1. Register this middleware

var host = new HostBuilder()
    .ConfigureFunctionsWorkerDefaults(app => {
        app.UseMiddleware<Iwate.AzureFunctions.Middlewares.Singleton.SingletonMiddleware>();
    })
    .Build();
host.Run();

2. Declare Singleton attribute on your function.

public class SingletonFunction
{
    [Function("SingletonFunction")]
    [Singleton()]
    public async Task RunAsync([QueueTrigger(QUEUE_NAME)]string message)
    {
        ...
    }
}

You can separate a singleton stream to a few lines by partial key if you put the arg on the Singleton attribute.

+-----------------+
|PARTIAL KEY: 100 |
+-------+---------+
        |
+-------v---------+                       +-----------------+
|PARTIAL KEY: 100 |                       |PARTIAL KEY: 101 |
+-------+---------+                       +--------+--------+
        |                                          |
+-------v------------------------------------------v--------+
|                                                           |
|                      Azure Functions                      |
|                                                           |
+-----------------------------------------------------------+

public class SingletonFunction
{
    [Function("SingletonFunction")]
    [Singleton(nameof(Trigger.PartialKey))]
    public async Task RunAsync([QueueTrigger(QUEUE_NAME)]Trigger trigger)
    {
        ...
    }
}
public class Trigger
{
    public string PartialKey { get; set; }
    public string Message { get; set; }
}