FeatureFlags.Abstractions

abstraction over feature flags for applications build with .net

A simple, small code to handle feature flags. No impressive features, but will be dead simple to use.

Install

PM> Install-Package FeatureFlags.Abstractions

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Configure the toggles (baklavaFeatures.xml)

<?xml version="1.0" encoding="utf-8" ?>
<featureToggles>
  <IceCream name="ice-cream on baklava" value="on" expires="2014-12-12"/>
</featureToggles>

Use the toggles to manage features

 var features = FeatureFlags.Map<BaklavaAppFeatures>("baklavaFeatures.xml");
 
 if(features.IceCream.IsOn())
 {
    //best combination ever
 }
 
 public class BaklavaAppFeatures
 {
    public Feature IceCream { get; internal set; }
 }

Feature toggle expiration acts as a reminder to remove them, or to the extend them conciously. Feature toggle should be dead, long live the feature toggles.

[Test]
public void icecream_feature_is_set()
{
    features.IceCream.Expired(DateTime.Today)
    	.Should().BeFalse("time to get rid off this toggle, and make the feature default");
}

Also you can set feature toggle value programmaticaly for testing purposes.

    var features = new BaklavaAppFeatures {Chai = FeatureWith.StateOn(), IceCream = FeatureWith.StateOff()};
	

• Expiration does not affect the value of the feature toggle.

TODO:

• add support to derive value from request cookies

NOTES:

• project naming is inspired by System.Configuration.Abstractions