SQLite Store

ff4k-store-sqlite provides SqliteFeatureStore and SqlitePropertyStore on top of SQLDelight. Features and properties are stored as JSON documents keyed by id and name; feature updates use optimistic locking with retry.

Installation

dependencies {
    implementation("com.yonatankarp:ff4k-store-sqlite:<version>")
    implementation("app.cash.sqldelight:sqlite-driver:<sqldelight-version>")
}

Usage

val driver = JdbcSqliteDriver("jdbc:sqlite:ff4k.db")
SqliteDatabase.Schema.create(driver).await()

val ff4k = FF4k(
    features = SqliteFeatureStore(driver),
    properties = SqlitePropertyStore(driver),
)

Both stores share one schema, so create it once per database.

Custom strategies and property types

Pass a Json built on ff4kSerializersModule to persist your own strategies and property value types:

val json = Json {
    serializersModule = ff4kSerializersModule + SerializersModule {
        polymorphic(FlippingStrategy::class) { subclass(MyStrategy::class) }
        polymorphic(Any::class) { subclass(MyValueType::class) }
    }
}
val featureStore = SqliteFeatureStore(driver, json)
val propertyStore = SqlitePropertyStore(driver, json)

Both stores must receive the same json, otherwise one of them will not recognise the custom types.