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Locking for composite render cache

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Kovid Goyal 2011-07-15 16:38:36 -06:00
parent 2290a06894
commit 97428f93a2
1 changed files with 13 additions and 6 deletions
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19
src/calibre/db/fields.py
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@ -8,6 +8,8 @@ __license__ = 'GPL v3'
__copyright__ = '2011, Kovid Goyal <kovid@kovidgoyal.net>'
__docformat__ = 'restructuredtext en'
from threading import Lock
from calibre.db.tables import ONE_ONE, MANY_ONE, MANY_MANY
from calibre.utils.icu import sort_key
@ -92,26 +94,31 @@ class CompositeField(OneToOneField):
OneToOneField.__init__(self, *args, **kwargs)
self._render_cache = {}
self._lock = Lock()
def render_composite(self, book_id, mi):
ans = self._render_cache.get(book_id, None)
with self._lock:
ans = self._render_cache.get(book_id, None)
if ans is None:
ans = mi.get(self.metadata['label'])
self._render_cache[book_id] = ans
with self._lock:
self._render_cache[book_id] = ans
return ans
def clear_cache(self):
self._render_cache = {}
with self._lock:
self._render_cache = {}
def pop_cache(self, book_id):
self._render_cache.pop(book_id, None)
with self._lock:
self._render_cache.pop(book_id, None)
def get_value_with_cache(self, book_id, get_metadata):
ans = self._render_cache.get(book_id, None)
with self._lock:
ans = self._render_cache.get(book_id, None)
if ans is None:
mi = get_metadata(book_id)
ans = mi.get(self.metadata['label'])
self._render_cache[book_id] = ans
return ans
def sort_books(self, get_metadata, all_book_ids, ascending=True):