I have a spring boot application and we have an application.yml with a set of feature flags on it
featureFlag:
featureOne:true
featureTwo:true
featureThree:true
featureFour:false
Then this file is read by a this class
@Configuration
@ConfigurationProperties(prefix="featureFlag")
public class FeatureFlag{
private Boolean featureOne;
private Boolean featureTwo;
private Boolean featureThree;
private Boolean featureFour;
/*The predicates based on the feature flags*/
private Predicate<FeatureFlag> isFeatureFlagOneEnabled = featureFlag.isFeatureOne();
private Predicate<FeatureFlag> isFeatureFlagTwoEnabled = featureFlag.isFeatureTwo();
private Predicate<FeatureFlag> isFeatureFlagThreeEnabled = featureFlag.isFeatureThree();
private Predicate<FeatureFlag> isFeatureFlagFourEnabled = featureFlag.isFeatureFour();
}
I want to pass the actual predicate and iterate each one of them but I want to know if I can do a generic function that I pass the list of Predicates with its value to be tested and if all of them are true the function return me a true otherwise false
Then in this class add some code like this because I want to generate this list on demand, for example I have a client x that purchase featureOne and featureTwo, in this example I create a list like this
Set<Predicate<FeatureFlag>> rulesForClientX = new HashSet<>();
rulesForClientX.add(isFeatureFlagOneEnabled);
rulesForClientX.add(isFeatureFlagTwoEnabled);
Then I want to create a specific logic for that client and pass it the list of predicates previously created, but I think I would need something like this
Function<List<Predicate<FeatureFlag>>, Boolean> iteratePredicates = (predicates) -> {
//test each predicate and return true if all of them are true otherwise return false
}
You can create a method that accepts Set<Predicate<FeatureFlag>>
and value, then you can stream set of predicates and use allMatch
public boolean testPredicates(Set<Predicate<FeatureFlag>> predicates, Integer value) {
return predicates.stream().allMatch(pre->pre.test(value));
}