Silverback.Core.Rx 5.7.1

Silverback

Simplicity at its core. Flexibility at its peak. Effortless messaging for .NET.

Silverback is a message bus and broker integration library to build event-driven architectures with first-class support for Apache Kafka and MQTT.

Documentation, guides, and samples are available at https://silverback-messaging.net.

Produce and Consume in a Few Lines

Configure the broker connection, the producer and consumer endpoints, and a subscriber. Silverback takes care of serialization, headers, error handling and delivery.

services.AddSilverback()
    .WithConnectionToMessageBroker(options => options.AddKafka())
    .AddKafkaClients(clients => clients
        .WithBootstrapServers("PLAINTEXT://localhost:9092")
        .AddProducer(producer => producer
            .Produce<OrderCreated>(endpoint => endpoint
                .ProduceTo("orders")))
        .AddConsumer(consumer => consumer
            .WithGroupId("billing")
            .Consume<OrderCreated>(endpoint => endpoint
                .ConsumeFrom("orders")
                .OnError(policy => policy.Retry(3).ThenSkip()))))
    .AddSingletonSubscriber<OrderCreatedHandler>();

// Publish: the message is routed to the "orders" topic
await publisher.PublishAsync(new OrderCreated(orderId));

// Consume: the subscriber is invoked for each consumed message
public class OrderCreatedHandler
{
    public Task HandleAsync(OrderCreated message) => ...;
}

Follow the Quickstart for a complete, runnable walkthrough.

Why Silverback

• Kafka-first, not Kafka-only – a consistent, fluent API for Kafka and MQTT that still surfaces partitions, keys, tombstones and transactions.
• Reliable by design – transactional outbox, error policies (retry, skip, move) and storage-backed offsets and locks.
• Built for throughput – partition-based parallelism, batch processing, streaming and chunking of large payloads.
• Cross-cutting features – serialization, Schema Registry (JSON, Avro, Protobuf), headers, validation and end-to-end encryption.
• Observable – structured logging, distributed tracing via System.Diagnostics and health checks.
• Testable – in-memory Kafka and MQTT brokers and testing helpers for fast and reliable end-to-end tests.

Packages

Silverback is modular – reference only what you need.

Core:

• Silverback.Core – message bus and core messaging components.
• Silverback.Core.Model – message semantics for event-driven/CQRS scenarios.

Broker integration:

• Silverback.Integration.Kafka – Kafka support.
• Silverback.Integration.MQTT – MQTT support.

Optional features:

• Silverback.Core.Rx – Rx.NET integration.
• Silverback.Integration.Newtonsoft – Newtonsoft.Json serialization.
• Silverback.Integration.Kafka.SchemaRegistry – Confluent Schema Registry integration (Avro, Protobuf and JSON).
• Silverback.Integration.HealthChecks – health checks for the consumers and the outbox.

Storage (for outbox, client-side offsets, distributed locks):

• Silverback.Storage.PostgreSql
• Silverback.Storage.Sqlite
• Silverback.Storage.EntityFramework
• Silverback.Storage.Memory

Testing:

• Silverback.Integration.Testing – broker-independent testing helpers.
• Silverback.Integration.Kafka.Testing – in-memory Kafka broker.
• Silverback.Integration.MQTT.Testing – in-memory MQTT broker.

Supported .NET Versions

Starting with v5, Silverback targets the latest .NET LTS (Long-Term Support) version only. It can run on newer compatible .NET versions (including STS releases), but older frameworks are no longer targeted or supported.

Documentation

The quickstart, guides, samples, FAQ and API reference are available at https://silverback-messaging.net.

Community

• Source code – the GitHub repository.
• Issues – report bugs or suggest improvements.
• Discussions – ask questions and share ideas.

License

Silverback is open source, licensed under the MIT License and maintained by Sergio Aquilini. See LICENSE.