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#!/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)
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