Spring Integration Essentials

Filters

Message filters are Spring Integration components, which act as an interceptor and decide whether to pass on the message to the next channel/component or drop it. Unlike routers, which decide what should be the next channel for a message, filters only take a boolean decision—whether to pass or not. There are two ways to define a message filter in Spring Integration:

• Write a simple Java class and designate its method that will take decisions whether to pass the message or not
• Configure it as a message endpoint that delegates to an implementation of the MessageSelector interface

This can be configured either in XML or annotations can be used.

Using a Java class to act as a filter

Let's take an example of using a simple Java class as a filter—this ...