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This commit is contained in:
Kovid Goyal 2012-01-18 11:17:58 +05:30
parent a2e76a5993
commit 64503d07fe
1 changed files with 10 additions and 5 deletions
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15
src/calibre/db/lazy.py
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@ -11,6 +11,13 @@
from functools import wraps
from collections import MutableMapping, MutableSequence
'''
Avoid doing stats on all files in a book when getting metadata for that book.
Speeds up calibre startup with large libraries/libraries on a network share,
with a composite custom column.
'''
# Lazy format metadata retrieval {{{
def resolved(f):
@wraps(f)
def wrapper(self, *args, **kwargs):
@ -20,7 +27,7 @@ def wrapper(self, *args, **kwargs):
return f(self, *args, **kwargs)
return wrapper
class MutableBaseMixin(object): # {{{
class MutableBase(object):
@resolved
def __str__(self):
@ -58,9 +65,8 @@ def __setitem__(self, key, val):
def __delitem__(self, key):
del self._values[key]
# }}}
class FormatMetadata(MutableBaseMixin, MutableMapping): # {{{
class FormatMetadata(MutableBase, MutableMapping):
def __init__(self, db, id_, formats):
self._dbwref = weakref.ref(db)
@ -76,7 +82,7 @@ def _resolve(self):
except:
pass
class FormatsList(MutableBaseMixin, MutableSequence):
class FormatsList(MutableBase, MutableSequence):
def __init__(self, formats, format_metadata):
self._formats = formats
@ -91,4 +97,3 @@ def insert(self, idx, val):
# }}}