loan pattern

loan.scala

class Loan[T <: {def close()}] private(resources: T) {
    def map[U](func: T => U): Option[U] =
        try {
            Option(func(resources))
        } catch {
            case ex: Throwable =>
            ex.printStackTrace()
            None
        } finally {
            if (resources != null)
                resources.close()
        }

    def flatMap[U](func: T => Option[U]): Option[U] =
        try {
            func(resources)
        } catch {
            case ex: Throwable =>
                ex.printStackTrace()
                None
        } finally {
            if (resources != null)
                resources.close()
        }
    }
object Loan {
    def apply[T <: {def close()}](value: T) = new Loan(value)
}