Finally equivalent in Scala Try [duplicate]

Question

def doWork() = {
  getLock()
  Try(useResource) match {
    case Success(result) => releaseLock(); result
    case Failure(e: Exception) => releaseLock(); throw e
  }
}

I'm trying to idiomatically make sure a lock is released when I exit doWork. However as part of that method I may throw an exception, so I can't just release the lock at the end of doWork.

It looks like a bit of code smell to have releaseLock() repeated twice. I could cut that down by using the traditional Java-style try/catch/finally:

def doWork() = {
  getLock()
  try {
    useResource
  } catch {
    case e: Exception => throw e
  } finally {
    releaseLock()
  }
}

But I prefer to use Scala's Try if possible.

Is there a way to perform "finally" logic from within the framework of Try?

Answer 1

Just squirrel the Try away temporarily:

def doWork = {
  getLock()
  val t = Try(useResource)
  releaseLock()
  t.get
}