# Architecture principles whose category is Event / Messaging / Asynchronous Architecture

> 19 records

This index as JSON: https://banes-lab.com/json/api/facets/architecture/category/event-messaging-asynchronous-architecture

## Entries

- [Event-Driven Architecture](https://banes-lab.com/records/architecture/event-driven-architecture.md): A convention of connecting services through published events, with each consumer reacting independently of the producer.
- [Publish/Subscribe Pattern](https://banes-lab.com/records/architecture/publish-subscribe-pattern.md): A design pattern in which publishers send messages to a topic and every subscriber to that topic receives them.
- [Message Queue](https://banes-lab.com/records/architecture/message-queue.md): A mechanism that holds messages durably until a consumer takes and acknowledges each one.
- [Message Broker](https://banes-lab.com/records/architecture/message-broker.md): Descriptive data about topics, queues and routing rules, held by an intermediary service that delivers messages between producers and consumers.
- [Event Bus](https://banes-lab.com/records/architecture/event-bus.md): A mechanism that dispatches each emitted event to the handlers registered for its type.
- [Event Stream](https://banes-lab.com/records/architecture/event-stream.md): A mechanism that keeps events in an ordered, replayable log that consumers read from their own offset.
- [Event Sourcing](https://banes-lab.com/records/architecture/event-sourcing.md): A design pattern that stores state as the sequence of events that produced it and rebuilds current state by replaying them.
- [CQRS](https://banes-lab.com/records/architecture/command-query-responsibility-segregation.md): A design pattern that separates the model that handles commands from the model that answers queries.
- [Domain Events](https://banes-lab.com/records/architecture/domain-events.md): A design pattern that records each significant change in the domain as an event named in the domain's language.
- [Integration Events](https://banes-lab.com/records/architecture/integration-events.md): A design pattern that publishes a versioned public event, mapped from an internal domain event, for consumers outside the service.
- [Asynchronous Communication](https://banes-lab.com/records/architecture/asynchronous-communication.md): A design rule that work the caller does not need at once is sent as a message, so the caller does not wait on it.
- [Eventual Consistency](https://banes-lab.com/records/architecture/eventual-consistency.md): A conceptual representation of a consistency guarantee in which replicas and projections converge once updates stop arriving.
- [Saga Pattern](https://banes-lab.com/records/architecture/saga-pattern.md): A design pattern that runs a cross-service transaction as a sequence of local steps, each paired with a compensating step.
- [Outbox Pattern](https://banes-lab.com/records/architecture/outbox-pattern.md): A design pattern that writes an outgoing message in the same local transaction as the state change, and a relay publishes it afterwards.
- [Compensating Transaction](https://banes-lab.com/records/architecture/compensating-transaction.md): A mechanism that undoes the business effect of a completed step when a later step of the workflow fails.
- [Append-Only Log](https://banes-lab.com/records/architecture/append-only-log.md): A design pattern that records history as immutable entries added at the end of the log.
- [Dead-Letter Queue](https://banes-lab.com/records/architecture/dead-letter-queue.md): A design pattern that moves a message which keeps failing into a separate queue, where it can be inspected and reprocessed.
- [Idempotent Consumer](https://banes-lab.com/records/architecture/idempotent-consumer.md): A design pattern in which a consumer records each message it has processed, so a redelivered message has no second effect.
- [Competing Consumers](https://banes-lab.com/records/architecture/competing-consumers.md): A design pattern in which several consumers read from one queue, and each message goes to only one of them.