package community.yuvomi.mobile

/** Never delivers a late system-picker result into a different server/web context. */
class SelectionGate {
    private var owner: Int? = null
    val outstanding: Boolean get() = owner != null

    fun begin(generation: Int): Boolean {
        if (outstanding) return false
        owner = generation
        return true
    }

    fun consume(generation: Int): Boolean {
        val previous = owner
        owner = null
        return previous == generation
    }

    fun restoreOutstanding() {
        owner = -1
    }
}