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Test-Driven Java Development - Second Edition by Viktor Farcic, Alex Garcia

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Feature Toggles

You might have also heard about this as Feature Flipping or Feature Flags. No matter which expression we use, they are all based on a mechanism that permits you to turn on and off the features of your application. This is very useful when all code is merged into one branch and you must deal with partially finished (or integrated) code. With this technique, unfinished features can be hidden so that users cannot access them.

Due to its nature, there are other possible uses for this functionality. As a circuit breaker when something is wrong with a particular feature, providing graceful degradation of the application, shutting down secondary features to preserve hardware resources for business core operations, and so on. Feature ...

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