Using a variable in finally block

Question

Here is code in Scala:

def write() = {
    try {
      val out = new PrintWriter(new BufferedWriter(new FileWriter(fileName, true)))
      out.println(\"123\")
          


        

Answer 1

This is what I use to manage closable resources passed to function returning and not retuning futures

  def withClosable[ T, C <: Closeable ]( closable: C )( f: C ⇒ T ) = try { f( closable ) } finally { IOUtils closeQuietly closable }

  def withFutureClosable[ T <: Future[Any], C <: Closeable ]( closable: C )( f: C ⇒ T ) = f( closable ) andThen {

        case _ => IOUtils closeQuietly closable
    } 
}

I use IOUtils from commons-io to simplify the call to actually close the resource. A simple try { closable.close() } catch { case _ => /* blah */ } would do

Example usage:

withClosable(new FileInpustream("f")) { stream => /* read the stream */ }