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Tentative implementation of using global render cache when evaluating composite columns in composite_getter()

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Kovid Goyal 2014-11-01 21:48:38 +05:30
parent d9ac4fcfcf
commit 066b749ebb
2 changed files with 27 additions and 9 deletions
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11
src/calibre/db/fields.py
View File

@ -253,6 +253,17 @@ class CompositeField(OneToOneField):
def bool_sort_key(self, val):
return self._bool_sort_key(force_to_bool(val))
def render_composite_with_cache(self, book_id, mi, formatter, template_cache):
with self._lock:
ans = self._render_cache.get(book_id, None)
if ans is None:
ans = formatter.safe_format(
self.metadata['display']['composite_template'], mi, _('TEMPLATE ERROR'),
mi, column_name=self._composite_name, template_cache=template_cache).strip()
with self._lock:
self._render_cache[book_id] = ans
return ans
def render_composite(self, book_id, mi):
with self._lock:
ans = self._render_cache.get(book_id, None)

23
src/calibre/db/lazy.py
View File

@ -219,17 +219,24 @@ def custom_getter(field, dbref, book_id, cache):
cache[field] = ret = fmt_custom(db.field_for(field, book_id))
return ret
def composite_getter(mi, field, metadata, book_id, cache, formatter, template_cache):
def composite_getter(mi, field, db, book_id, cache, formatter, template_cache):
try:
return cache[field]
except KeyError:
cache[field] = 'RECURSIVE_COMPOSITE FIELD (Metadata) ' + field
ret = cache[field] = formatter.safe_format(
metadata['display']['composite_template'],
mi,
_('TEMPLATE ERROR'),
mi, column_name=field,
template_cache=template_cache).strip()
try:
db = db()
with db.safe_read_lock:
try:
fo = db.fields[field]
except KeyError:
ret = cache[field] = _('Invalid field: %s') % field
else:
ret = cache[field] = fo.render_composite_with_cache(book_id, mi, formatter, template_cache)
except Exception:
import traceback
traceback.print_exc()
return ''
return ret
def virtual_libraries_getter(dbref, book_id, cache):
@ -316,7 +323,7 @@ class ProxyMetadata(Metadata):
if field.endswith('_index') and dt == 'float':
return series_index_getter(field[:-6])(ga(self, '_db'), ga(self, '_book_id'), ga(self, '_cache'))
return custom_getter(field, ga(self, '_db'), ga(self, '_book_id'), ga(self, '_cache'))
return composite_getter(self, field, d, ga(self, '_book_id'), ga(self, '_cache'), ga(self, 'formatter'), ga(self, 'template_cache'))
return composite_getter(self, field, ga(self, '_db'), ga(self, '_book_id'), ga(self, '_cache'), ga(self, 'formatter'), ga(self, 'template_cache'))
try:
return ga(self, '_cache')[field]