ExampleRepository.kt

class ExampleRepository {

    private val cache = MutableStateFlow<Example?>(null)

    /**
     * Observe the current value. Emits `null` if it's empty.
     */
    fun observe(): Flow<Example?> = cache.asStateFlow()

    /**
     * Get the current value. Returns `null` if it's empty.
     */
    fun get(): Example? = cache.value

    /**
     * Update the current value. Setting `null` will clear it.
     */
    fun set(value: Example?) {
        cache.update { value }
    }

    /**
     * Clear the current value.
     */
    fun clear() {
        cache.update { null }
    }
}