Eventbusar

Eventbusar is a software concept and, in many practical implementations, an in-process event bus architecture that enables decoupled communication between components through events. Producers publish events to a central bus, and subscribers register handlers for specific event types or topics. The bus dispatches events to interested handlers without requiring direct references between publishers and consumers, facilitating modular design and easier testing.

Core concepts include a publish-subscribe model, topic-based routing, and asynchronous or synchronous delivery. Events are categorized by type or topic, and handlers can be registered as one-to-one or one-to-many. Many implementations support dynamic subscriptions, event filtering, and metadata that influence routing decisions. Concurrency safety, backpressure management, and fault handling are common design considerations.

Typical features include middleware or interceptor support to inspect, modify, or short-circuit events as they pass through the bus; error handling and retry policies; and observability hooks such as logging and tracing. Some designs offer hierarchical topics, wildcards, or pattern matching to simplify subscription configurations across large systems.

Use cases range from user interface event flows to modular plugin systems, and from in-process coordination of components in a single application to lightweight coordination in microservices architectures. Eventbusar-like architectures are often contrasted with message brokers that operate across process or network boundaries, highlighting differences in locality, durability, and scalability.

See also: event bus, publish-subscribe pattern, observer pattern, message broker, event streaming.