How to catch client disconnection when sending a large file?

[setu basak]

I am sending a large file in play application response. When the client downloads the file, i am cleaning the file from the local server. I am achieving this using below code:

val fileToServe = TemporaryFile(new File(fileName))
Ok.sendFile(fileToServe.file, onClose = () => { fileToServe.clean })


But when client disconnects the connection, the temporary file remains in the local server. But i want to handle this disconnection and clean up the

temporary file. I heard about onDoneEnumerating() but couldn't use it.

Can anyone point me out the easiest way to catch the disconnection and clean up the temporary file from local server?

[Will Sargent]

TemporaryFile is for when Play receives a data stream that has to be kept in a temporary file location, rather than you sending a file out.  It removes on finalization (pre 2.6) or on phantom file reference (2.6.x).  

The easiest way to catch the disconnection is to call Files.deleteIfExists

https://docs.oracle.com/javase/8/docs/api/java/nio/file/Files.html#deleteIfExists-java.nio.file.Path- 

in the onClose block.  If that doesn't seem to be working for some reason, you can use the temporary file reaper:

https://www.playframework.com/documentation/2.6.x/ScalaFileUpload#Cleaning-up-temporary-files

that will clean out the temp files directory every so often.

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