Reactive Design Patterns

Chapter 4. Message passing

The fundamental notion on which message passing is built is that of an event: the fact that a certain condition has occurred (the event) is bundled together with contextual information—like who did what when and where—and is signaled by the producer as a message. Interested parties are informed by the producer using a common transport mechanism and consume the message.

In this chapter, we will discuss in detail the main aspects of message passing:

• The difference between focusing on messages or events
• Whether to do it synchronously or asynchronously
• How messages can be transmitted without overwhelming the recipient and with varying degrees of reliability

You will also see how message passing enables vertical ...