MassTransit: The Enterprise Service Bus for .NET

Using raw `RabbitMQ.Client` or `Azure.Messaging.ServiceBus` is difficult. You have to handle retries, serialization, and topology yourself. MassTransit handles this for you.

Saga Pattern

MassTransit has first-class support for Sagas (Long running processes) using State Machines.

stateDiagram-v2
    [*] --> Submitted
    Submitted --> Validated : Order Validated
    Validated --> PaymentPending : Payment Requested
    PaymentPending --> Paid : Payment Received
    Paid --> Shipped : Shipping Confirmed
    PaymentPending --> Cancelled : Payment Failed

This state machine is defined in C# using a fluent syntax (`Currently(Submitted).When(OrderValidated)…`) and persisted to SQL/Redis automatically.