Event Bus

Kind: mechanism

Layer: Execution Core

Record: architecture:event-bus

Severity: contextual

Scope: application, integration

Canonical: Ontology

A mechanism that dispatches each emitted event to the handlers registered for its type.

Listed in Architecture principles, after Message Broker and before Event Stream.

Requires

• Event Contract
• Subscriber Model

Reinforces

• Publish/Subscribe Pattern
• Event-Driven Architecture

Enables

• Decoupled Event Distribution

Conflicts with

• Direct Event Handler Calls

In tension with

• Event Storm / Traceability

Tensions

• Event Bus / Event Storm / Traceability

Violated by

• Hidden Dependency

Refactored by

• Registry Pattern

Severity

• contextual

Category

• Event / Messaging / Asynchronous Architecture

Linked from

• Execution joins the halves
• Event / Messaging / Asynchronous Architecture
• Causality / Ordering / Distributed Time
• Event Messaging Async
• Severity levels
• The resolutions

in this codebase

• emitEvent
• subscribeEvent
• core/buses