Spring Integration Essentials

Selecting a channel

Let's discuss what default implementations have been provided by Spring Integration and how they can be leveraged.

Publish-subscribe channel

This is the only implementation of the publish-subscribe model of channel. The primary purpose of this channel is to send messages to registered endpoints; this cannot be polled. It can be declared as follows:

<int:publish-subscribe-channel id="pubSubChannel"/>

Let's discuss each of the elements in this line; this will be used throughout the examples of this chapter:

• int: This is a namespace that declares all Spring Integration components. As discussed in Chapter 1, Getting Started, the STS visual editor can be used to add different namespaces from Spring Integration.
• publish-subscribe-channel ...