layout	title	folder	permalink	categories	tags
pattern	Data Bus	data-bus	/patterns/data-bus/	Architectural	Java Difficulty-Intermediate

Intent

Allows send of messages/events between components of an application without them needing to know about each other. They only need to know about the type of the message/event being sent.

Applicability

Use Data Bus pattern when

• you want your components to decide themselves which messages/events they want to receive
• you want to have many-to-many communication
• you want your components to know nothing about each other

Related Patterns

Data Bus is similar to

• Mediator pattern with Data Bus Members deciding for themselves if they want to accept any given message
• Observer pattern but supporting many-to-many communication
• Publish/Subscribe pattern with the Data Bus decoupling the publisher and the subscriber