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FF4J, standing for Feature Flipping for Java, is a proposition of Feature Toggle written in Java. The present guide will describe the different capabilities of the framework including some sample codes.

Definitions

• Feature toggle (also known as feature flipping, feature flags or feature bits) is the capacity for a program or an application to enable and disable features at runtime. The toggle can be operate programmatically, through web console, through api, through command line or even through JMX. The source code includes several paths that will be executed or not depending on the values of flags/features.

• A Feature represents a business logic that can potentially crosses every layer of applications from user interfaces to data access. Therefore, to implement a feature toggle mechanism, we must help you in each layer as shown with the picture on the right.

Use Cases

Use cases can be found on the home page of FF4j ff4j.org