OpenSleigh.Transport.RabbitMQ 3.0.0-alpha

OpenSleigh.Transport.RabbitMQ

Description

RabbitMQ Transport library for OpenSleigh

Installation

This library can be installed from Nuget: https://www.nuget.org/packages/OpenSleigh.Transport.RabbitMQ/

How-to

The first thing to do is build an instance of RabbitConfiguration with the connection details. This can be done by reading the current app configuration. Once done, all you have to do is to call the UseRabbitMQTransport extension method:

services.AddOpenSleigh(cfg =>{     
    var rabbitSection = Configuration.GetSection("Rabbit");
    var rabbitCfg = new RabbitConfiguration(rabbitSection["HostName"],
        rabbitSection["UserName"],
        rabbitSection["Password"]);

        cfg.UseRabbitMQTransport(rabbitCfg);

    // register the Persistence and the Sagas
});

It is also possible to use a custom naming policy to define the names for exchanges and queues. This allows us to have a single exchange bound to multiple queues. Messages will be routed using the queue name.

services.AddOpenSleigh(cfg =>{  
    // code omitted
    cfg.UseRabbitMQTransport(rabbitCfg, builder =>
    {                        
        builder.UseMessageNamingPolicy<StartChildSaga>(() => new QueueReferences("child", "child.start", "child.dead", "child.dead.start"));
        builder.UseMessageNamingPolicy<ProcessChildSaga>(() => new QueueReferences("child", "child.process", "child.dead", "child.dead.process"));
    })
});

If your application has to handle messages and events, not just dispatch them, you also have to configure each Saga :

services.AddOpenSleigh(cfg =>{  
    // code omitted //

    cfg.AddSaga<MySaga, MySagaState>()
        .UseStateFactory<StartSaga>(msg => new MySagaState(msg.CorrelationId))
        .UseRabbitMQTransport();
});

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