EventBroker

EventBroker is a software component that implements a publish-subscribe event bus, enabling decoupled communication between producers and consumers in event-driven architectures. It receives events from producers, stores or routes them, and delivers them to interested subscribers based on topics, event types, or filters.

Key concepts include topics or channels, event schemas, publish/subscribe semantics, and routing policies. EventBroker may provide durable versus non-durable subscriptions, at-least-once or exactly-once delivery guarantees, and replay capabilities. It often supports dead-letter queues for failed deliveries and retention policies to enable debugging or state reconstruction.

Architecturally, EventBroker typically comprises producers, consumers, a central broker or cluster, and optional adapters to external systems. It may feature partitioning, clustering, or multi-region replication for scalability and fault tolerance. Common protocol support includes AMQP, MQTT, Kafka-compatible interfaces, as well as REST or gRPC APIs. Many implementations integrate with a schema registry to manage event contracts and evolve schemas safely.

Common features also include access control, encryption, auditing, observability via metrics, and health checks. Dynamic subscriptions, message filtering, and event enrichment capabilities are often provided, along with tooling for monitoring, testing, and maintenance. EventReplay and time-based retention policies support state reconstruction and incident analysis.

Use cases span microservices communication, real-time analytics, IoT telemetry ingestion, and system integration across heterogeneous environments. In cloud-native deployments, an EventBroker may be offered as a managed service or deployed as a containerized cluster within orchestration platforms.

See also: Event-driven architecture, Message broker, Publish-subscribe pattern.