def __update_count(self):
"""Update the bookkeeping structure at the head of the file
with the total count of reusable IDs
Parameters
----------
None
Returns
-------
None"""
self.db_map.seek(0)
bin_str = structs.pack_garbage(self.__count)
self.db_map.write(bin_str)
def append(self, _id):
"""Append an object ID to be "garbage collected" to this GarbageFile.
Once appended, the ID will be available for reuse by the ObjectFile
that this GarbageFile is associated with.
Parameters
----------
_id: the integer ID to append to this GarbageFile
Returns
-------
None"""
self._ids.insert(0, _id)
self.db_map.seek((structs._SIZEOF_GARBAGE * self.__count) + structs._SIZEOF_GARBAGE)
bin_str = structs.pack_garbage(_id)
self.db_map.write(bin_str)
self.__count += 1
self.__update_count()