Enterprise Integration Patterns: Designing, Building, and Deploying Messaging Solutions (Addison-Wesley Signature Series (Fowler))

by Hohpe Gregor

A Channel Adapter (127) is a component that can attach to an application and publish messages to a Message Channel (60) whenever an event occurs inside the application. With some Channel Adapters (127), the application may not even be aware of the presence of the adapter. For example, a database adapter may add triggers to specific tables so that every time the application inserts a row of data, a message is sent to the Message Channel (60). Channel Adapters (127) can also work in the opposite direction, consuming messages off a Message Channel (60) and triggering an action inside the application in response.