Feature Store¶

The Feature Store is a critical component of FF4J that manages the storage and retrieval of feature toggles. It provides a centralized repository for all feature definitions, including their states (enabled/disabled), descriptions, groups, permissions, and any associated flipping strategies.

Overview¶

The Feature Store is designed to be pluggable, allowing you to choose from various storage backends based on your application's needs. Common implementations include in-memory stores, relational databases, NoSQL databases, and file-based stores.

You will find CRUD operations and utility method to interact with features (createSchema, grantPermissions,). They are a dozen implementations for different technologies as detailed in the Store documentation.

FeatureStore object¶

classDiagram
    class FeatureStore {
        <<interface>>
        enable(String)
        disable(String)
        exist(String): boolean
        create(Feature)
        read(String): Feature
        readAll(): Map
        delete(String)
        update(Feature)
        enableGroup(String)
        disableGroup(String)
        readGroup(String): Map
        readAllGroups(): Set
        clear()
        importFeatures(Collection)
        createSchema()
    }

Examples¶

Initialize FF4j with a Feature Store¶

// Using InMemoryFeatureStore
FeatureStore featureStore = new InMemoryFeatureStore();
FF4j ff4j = new FF4j(featureStore);

Create and Manage Features via Feature Store¶

// Create a new feature
Feature newFeature = new Feature("new-feature", false, "This is a new feature");
ff4j.getFeatureStore().create(newFeature);
// Enable the feature
ff4j.getFeatureStore().enable("new-feature");
// Check if the feature exists
boolean exists = ff4j.getFeatureStore().exist("new-feature");
// Read the feature
Feature feature = ff4j.getFeatureStore().read("new-feature");
// Disable the feature
ff4j.getFeatureStore().disable("new-feature");
// Delete the feature
ff4j.getFeatureStore().delete("new-feature");