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Diffstat (limited to 'src/GeneratorUtils.py')
-rw-r--r-- | src/GeneratorUtils.py | 56 |
1 files changed, 56 insertions, 0 deletions
diff --git a/src/GeneratorUtils.py b/src/GeneratorUtils.py index e69de29bb..69fe86e3f 100644 --- a/src/GeneratorUtils.py +++ b/src/GeneratorUtils.py @@ -0,0 +1,56 @@ +#!/usr/bin/env python +# $Id$ + +from os import listdir, stat +from stat import ST_MTIME + +class FileBacked(object): + '''FileBacked is a class that will cache file data and automatically reload it as required from disk. + This class is currently READ-ONLY.''' + + def __init__(self,filename): + '''Setup initial structures''' + self.filename = filename + self.mtime = stat(filename)[ST_MTIME] + self._data = file(filename).read() + + def getdata(self): + mtime = stat(self.filename)[ST_MTIME] + if mtime != self.mtime: + self._data = file(self.filename).read() + self.mtime = mtime + return self._data + + def setdata(self,val): + pass + + data=property(getdata,setdata) + +class DirectoryBacked(object): + '''DirectoryBacked caches a complete directory (including proper negative caching)''' + + def __init__(self,path): + self.path = path + self._entries = {} + self.mtime = stat(path)[ST_MTIME] + for entry in listdir(path): + self._entries[entry] = FileBacked("%s/%s"%(path,entry)) + + def GetEntries(self): + mtime = stat(self.path)[ST_MTIME] + if mtime != self.mtime: + current = self._entries.keys() + new = listdir(self.path) + for key in new: + if key not in current: + self._entries[key] = FileBacked("%s/%s"%(self.path,key)) + for key in current: + if key not in new: + del self._entries[key] + return self._entries + + def SetEntries(self,val): + pass + + entries = property(GetEntries,SetEntries) + |