Would scala close the InputStream automatically?

Question

I'm a newbie of scala and not familiar to the stream close mechanism. I wrote some code like this.

def loadResourceAsString(path: String) = {

  val is = this.getClass().getResourceAsStream(path)

  Source.fromInputStream(is).getLines().mkString("\n")

}

I found this in scala source code. The Source would return a BufferedSource which override close method to close the input stream.

def fromInputStream(is: InputStream)(implicit codec: Codec): BufferedSource =
  createBufferedSource(is, reset = () => fromInputStream(is)(codec), close = () => is.close())(codec)

If there was exception, would scala execute the close method by its own mechanism?

Or, should I close input stream in finally block explicitly just like java?

score 3 · Accepted Answer · answered Aug 28 '13 at 03:48

3

In short - no. createBufferedSource creates BufferedSource with given close function, but never calls neither for reset not for close

answered Aug 28 '13 at 03:48

1esha

1,722
11
17

in this case how to close the inputstream in scala? – yabchexu Jun 26 '20 at 23:31

score 0 · Answer 2 · edited May 23 '17 at 12:08

0

May be this post will be helpful: Scala: “using” function.

It looks similar to C# using statement which I find very convenient.

edited May 23 '17 at 12:08

Community

1
1

answered Aug 28 '13 at 08:33

user4298319

432
3
10

Also look at [scala-arm](http://jsuereth.com/scala-arm/) if you need a consistent solution to resource management – pagoda_5b Aug 28 '13 at 10:41

Would scala close the InputStream automatically?

2 Answers2

Linked