https://github.com/fabianmurariu/reactivefs

Asynchrnonous IO on disk
https://github.com/fabianmurariu/reactivefs

Last synced: about 17 hours ago
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Asynchrnonous IO on disk

• Host: GitHub
• URL: https://github.com/fabianmurariu/reactivefs
• Owner: fabianmurariu
• Created: 2014-11-03T07:58:55.000Z (about 10 years ago)
• Default Branch: master
• Last Pushed: 2014-11-29T19:16:50.000Z (about 10 years ago)
• Last Synced: 2023-03-30T03:11:22.465Z (almost 2 years ago)
• Language: Scala
• Size: 188 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
**Proper Functional IO with Play Iteratees**

 

The current IO implementation in Play Iteratees is not functional enough, it is using mutable state over OutputStream 

or InputStream see [EnumeratorsSpec](https://github.com/playframework/playframework/blob/master/framework/src/iteratees/src/test/scala/play/api/libs/iteratee/EnumeratorsSpec.scala)

The suggested approach in this repo uses [AsynchronousFileChannel](https://docs.oracle.com/javase/8/docs/api/java/nio/channels/AsynchronousFileChannel.html)

to handle asynchronous read/writes over a file and wraps them functional structures Reader/Writer that always return

 a new object on every apply, they also wrap scala.concurrent.Future making them very easy to integrate with Play Iteratees

 

 

 Reader is an enumerator over a file

```scala

...

val enumerator: Enumerator[Array[Byte]] = Readers.toEnumerator("file", 5)

val eventualArray = enumerator |>>> Iteratee.fold(Array[Byte]())((chunk, result) => chunk ++ result)

result(eventualArray, 5 seconds) //file content should be here

...

```

Writer is an Iteratee over that writes to a file the byte arrays pushed by an Enumerator

```scala

...

val iterateeWriter = Writers.toIteratee("file")

val eventualWriter = input |>>> iterateeWriter

result(eventualWriter, 5 seconds) // the number of bytes written

```

For more detail see ReaderSpec and WriterSpec