Fan-out (software)

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In message-oriented middleware solutions, fan-out is a messaging pattern used to model an information exchange that implies the delivery (or spreading) of a message to one or multiple destinations possibly in parallel, and not halting the process that executes the messaging to wait for any response to that message.[1][2][3]

Also fan-out in software construction means the number of classes used by a certain class or the number of methods called by a certain method.[4]


  1. ^ "AMQP 0-9-1 Model Explained". RabbitMQ.
  2. ^ "Writing Request/Response Clients and Servers: Sending Asynchronous Messages". Oracle Tuxedo Documentation.
  3. ^ "/dev/fanout : A One-To-Many Multiplexer".
  4. ^ McConnell, Steven (2004). "Chapter 5: Design Construction". Code Complete, Second Edition. Microsoft Press. ISBN 978-0-7356-1967-8.