Hi,
i am now doing some prototypes for my projects which will be dealing with
tones of files. After a little scouting i decided to try z3c.extfile. Every
thing works fine. But i found it strange that there is no delete feature in
z3c.extfile. ie, even if i can delete a ExtFile object, the file in the hash
directory is not getting deleted! and it keeps on accumulating...
So i thought i 'll add a delete feature... but my __del__() approach
doesn't work for me. but i added an additional delete() function too which
can be invoked explicitly to delete the file before trying to delete ExtFile
object.
i made following changes to the source...
inside z3c.extfile.file.file.ExtFile,
----------------------------------------------------------------------------------------------
class ExtFile(Persistent):
"""A zope file implementation based on z3c.extfile"""
interface.implements(IExtFile)
data = ExtBytesProperty('data')
def __init__(self, data='', contentType=''):
self.data = data
self.contentType = contentType
# added the following lines#
* def __del__(self): # <- this is not being invoked when i try to
delete an extfile object
del self.data
#print "deleted data via destructor"
def delete(self): # <- added this to be able to manually able to
delete files
del self.data
#print "deleted data via delete()"
# # # # # # # # # # # # # # #
*
def getSize(self):
return len(self.data)
----------------------------------------------------------------------------------------------
and the 'data' is a 'property' (ExtBytesProperty)
so i made following changes to z3c.extfile.property.ExtBytesProperty
----------------------------------------------------------------------------------------------
class ExtBytesProperty(object):
"""a property which's values are stored as external files"""
def __init__(self, name):
self.__name = name
# added the following lines#
* def __delete__(self,inst):
digest = inst.__dict__[self.__name]
self.hd.delete(digest)
* *# # # # # # # # # # # # # # #
* @property
def hd(self):
return component.getUtility(interfaces.IHashDir)
def __get__(self, inst, klass):
if inst is None:
return self
digest = inst.__dict__.get(self.__name, _marker)
if digest is _marker:
return None
return getFile(digest)
def __set__(self, inst, value):
# ignore if value is None
if value is None:
if inst.__dict__.has_key(self.__name):
del inst.__dict__[self.__name]
return
# Handle case when value is a string
if isinstance(value, unicode):
value = value.encode('UTF-8')
if isinstance(value, str):
value = StringIO(value)
value.seek(0)
f = self.hd.new()
while True:
chunk = value.read(BLOCK_SIZE)
if not chunk:
newDigest = f.commit()
oldDigest = inst.__dict__.get(self.__name, _marker)
if newDigest == oldDigest:
# we have no change, so we have to seek to zero
# because this is normal behaviour when setting a
# new value
if hasattr(_storage, 'dataManager'):
if newDigest in _storage.dataManager.files:
f = _storage.dataManager.files[newDigest]
f.seek(0)
else:
inst.__dict__[self.__name] = newDigest
break
f.write(chunk)
----------------------------------------------------------------------------------------------------
and at last added the real code which delete the file in hash directory too
i added following codes inside z3c.extfile.hashdir.HashDir class
---------------------------------------------------
def delete(self,digest):
"""delete the file"""
path=self.getPath(digest)
if os.path.exists(path):
os.remove(path)
return
----------------------------------------------------
Now, everything works fine when i try to delete an ExtFile object in ZODB,
__del__() is not being invoked!!!!!
can anyone tell me how can i fix this???
thanks in advance
jayaraj
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