Reactive Messaging Patterns With the Actor Model: Applications and Integration in Scala and Akka by Vaughn Vernon

Author:Vaughn Vernon [Vernon, Vaughn]
Language: eng
Format: epub
ISBN: 9780133846836
Amazon: 0133846830
Publisher: Addison-Wesley Professional
Published: 2015-08-16T22:00:00+00:00

Request-Reply

When a message is sent from one actor to another, it is considered a request. When the receiver of the request message needs to send a message back to the request sender, the message is a reply. As shown in Figure 6.4, a common usage pattern of Request-Reply has the requestor sending a Command Message (202) and the receiver replying with a Document Message (204). In such a case, and as described in Command Message (202), the command is probably a Query Message [IDDD].

Figure 6.4 A Requestor and a Reactor collaborate with each other using Request-Reply.

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