alternate.scala

val managerOne: ManagerGetter[Manager[One]] = getManager(oneParam)
managerOne.get().write(one.key, one)
managerOne.flush()

managers.scala

// getManager(param: String): Manager[T]
// val one: One
// val two: Two
// val three: Three
// val four: Four


// ?
def write(t: T) = {
    // ?
}


val managerOne = getManager(oneParam)
(managerOne.get(): Manager[One]).write(one.key, one)
managerOne.flush()

val managerTwo = getManager(twoParam)
(managerTwo.get(): Manager[Two]).write(two.key, two)
managerTwo.flush()

val managerThree = getManager(threeParam)
(managerThree.get(): Manager[Three]).write(three.key, three)
managerThree.flush()

val managerFour = getManager(fourParam)
(managerFour.get(): Manager[Four]).write(four.key, four)
managerFour.flush()