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Command Bus

concept 5 connections

Pattern where commands are dispatched through a bus that maps each command to a single registered handler. Registration happens at boot time; at execution time the publisher simply tells the bus to handle the command without knowing the concrete handler. Contrasted with an event bus where a single message can be handled by multiple subscribers.

category
pattern
talk Message Bus Decoupling Lightning Talk
about
Command Bus concept
Shows registration and execution of command handlers via a bus.
talk Process Managers in Ruby Lightning Talk
about
Command Bus concept
Commands returned by the process manager are dispatched through the command bus.
talk Typical DDDomains In Rails Apps
about
Command Bus concept
Service objects dispatch commands on a command bus the talk describes.
question How do you test units with dependencies on other units?
about
Command Bus concept
Answer: use fake command bus and assert events/commands.
concept Event Bus
related_to
Command Bus concept
Sister pattern — same registration/execution mechanics, but events fan out to multiple handlers while commands go to one.

Provenance

Created in
Wroclove.rb 2018 Lightning Talks (Part 2) — Ethereum, Mes... 2026-04-17 17:52
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