Feature Toggle Implementation Techniques

A Java implementation of the implementation techniques for feature toggles by Pete Hodgson.

For each of the 3 different implementation techniques a separate branch was created:

• 1-naive-implementation: using if-else in the business logic => toggle point and toggle router at the same place
• 2-inversion-of-decision: move the toggle router to a feature decision class
• 3-avoiding-conditions: using a feature aware factory and the strategy pattern

The master branch contains the Avoid Conditions implementation.

Naive Implementaiton

This uses if-else conditions in the business logic. As a result toggle point and toggle router are at the same place.

Inversion of Decision

This implementation uses a feature decision class for the toggle router. But the business logic still contains an if-else condition.

As a result toggle routing is moved away from the business logic, but the toggle point is still inside the business logic.

Avoiding Conditions

This implementation uses a feature aware factory and the strategy pattern. The if-else condition is moved outside the business logic to the factory.

We have a clear seperation between toggle point and toggle routing. The toggle routing is handled by a feature decision class. The toggle point is handled by the factory.