Play2 new plugin: File NonBlocking/Async API - Copying a file

gistfile1.scala

"copy file" in {
  var i = 0
  val fileGenerator = Enumerator.fromCallback( () => 
    if(i<1000){ i+=1; Future.successful(Some((new java.util.Date).getTime.toString + "\n")) } else Future(None) 
  )

  val f = FileChannel("/tmp/testwrite.txt").delete.writing.create
  val f2 = FileChannel("/tmp/testwrite2.txt").delete.writing.create

  fileGenerator                                     // generates data
    .through(RichEnumeratee.binarize())             // binarizes data to write into File
    .run(f.writer())                                // writes into file
    .flatMap{ sz => f.reader().run(f2.writer()) }  // when written, reads file and writes into dest file
    .onSuccess{ case sz: Long => println("wrote %d".format(sz)) }   // when finished, tells how many bytes were written

  // Same with operators
  fileGenerator                                     // generates data
    &> RichEnumeratee.binarize()             // binarizes data to write into File
    |>>> f.writer()                                // writes into file
    flatMap { sz => f.reader() |>>> (f2.writer()) }  // when written, reads file and writes into dest file
    onSuccess { case sz: Long => println("wrote %d".format(sz)) }   // when finished, tells how many bytes were written

  success
}