[Assorted-commits] SF.net SVN: assorted: [235] python-commons/trunk/src/commons/files.py

[<yan...@us...>]

Revision: 235
          http://assorted.svn.sourceforge.net/assorted/?rev=235&view=rev
Author:   yangzhang
Date:     2008-01-17 15:57:23 -0800 (Thu, 17 Jan 2008)

Log Message:
-----------
fixed accidental wiping out of read-file in persistent disk double buffer

Modified Paths:
--------------
    python-commons/trunk/src/commons/files.py

Modified: python-commons/trunk/src/commons/files.py
===================================================================
--- python-commons/trunk/src/commons/files.py	2008-01-17 23:41:52 UTC (rev 234)
+++ python-commons/trunk/src/commons/files.py	2008-01-17 23:57:23 UTC (rev 235)
@@ -86,18 +86,18 @@
     writing, and a facility for swapping the two roles is provided.
     """
     def __init__( self, path_base, do_persist = True ):
-        self.paths = [ path_base + '.0', path_base + '.1' ]
+        self.paths = map( path, [ path_base + '.0', path_base + '.1' ] )
         self.do_persist = do_persist
         self.switch_status = path( path_base + '.switched' )
         if not do_persist or not self.switch_status.exists():
             self.w, self.r = 0, 1 # default
         else:
             self.w, self.r = 1, 0
-        # initialize empty reader file
-        with file( self.paths[ self.r ], 'w' ): pass
         self.reload_files()
     def reload_files( self ):
         self.writer = file( self.paths[ self.w ], 'w' )
+        if not self.paths[ self.r ].exists():
+            self.paths[ self.r ].touch()
         self.reader = file( self.paths[ self.r ] )
     def switch( self ):
         self.close()


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