question: private void closeFile ( ) { if ( plogStream != null ) { try { plogStream . close ( ) ; logger . info ( "File " + plogFilename + " closed." ) ; } catch ( IOException e ) { logger . warn ( "Unable to close file cleanly: " + plogFilename ) ; } finally { plogStream = null ; } } }
target:  Close plog file. This operation is idempotent to allow convenient cleanup at thread exit.