scoping of data

Scoping.kt

typealias Session = String
typealias SessionId = String

// Global Graph
interface GlobalGraph {
    val sessionCache: SessionCache
}

// 1 - Global state
// globalGraph.sessionCache.getCurrentSession()
interface SessionCache {
    fun getCurrentSession(): Session
}

// 2 - Global state with method injection
// globalGraph.sessionCache.getSession(sessionId)
interface SessionCache {
    fun getSession(sessionId: SessionId): Session
}


// 3 - Scoped state
// globalGraph.sessionCache.getSession(sessionId)
interface GlobalGraph {
    val sessionGraph: SessionGraph
}
interface SessionGraph {
    val sessionId: SessionId
    val sessionCache: SessionCache
}

class SessionCache(private val sessionId: SessionId) {
    fun getSession(): Session = TODO()
}