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Messaging is one integration style out of many, used for connecting various applications in a loosely coupled, asynchronous manner. Messaging decouples the applications from data transferring, so that applications can concentrate on data and related logic while the messaging system handles the transferring of data.

This chapter introduces the basic patterns used when implementing enterprise integration using messaging and how they are simulated using the ESB profile of WSO2 EI. These patterns are the fundamentals on which the rest of the chapters in this guide are built.

Message Channels (with MSF4J)

How one application communicates with another using messaging.

Message

How two applications connected by a message channel exchange a piece of information.

Pipes and Filters

How to perform complex processing on a message while maintaining independence and flexibility.

How to decouple individual processing steps so that messages can be passed to different filters depending on conditions.

Message Translator

How systems using different data formats communicate with each other using messaging.

How an application connects to a messaging channel to send and receive messages.

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