mirror of
https://github.com/kovidgoyal/calibre.git
synced 2025-07-08 02:34:06 -04:00
Improved get_categories -- approximately 6 times faster
This commit is contained in:
Charles Haley
parent
f1911aa270
commit
d2ff37b5a1
@ -14,7 +14,7 @@ from operator import itemgetter
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from PyQt4.QtGui import QImage
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from calibre import prints
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from calibre.ebooks.metadata import title_sort, author_to_author_sort
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from calibre.ebooks.metadata.opf2 import metadata_to_opf
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from calibre.library.database import LibraryDatabase
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@ -1039,25 +1039,139 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
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tn=field['table'], col=field['link_column']), (id_,))
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return set(x[0] for x in ans)
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########## data structures for get_categories
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CATEGORY_SORTS = ('name', 'popularity', 'rating')
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def get_categories(self, sort='name', ids=None, icon_map=None):
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self.books_list_filter.change([] if not ids else ids)
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class TCat_Tag(object):
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categories = {}
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def __init__(self, name, sort):
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self.n = name
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self.s = sort
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self.c = 0
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self.rt = 0
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self.rc = 0
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self.id = None
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def set_all(self, c, rt, rc, id):
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self.c = c
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self.rt = rt
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self.rc = rc
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self.id = id
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def __str__(self):
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return unicode(self)
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def __unicode__(self):
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return 'n=%s s=%s c=%d rt=%d rc=%d id=%s'%\
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(self.n, self.s, self.c, self.rt, self.rc, self.id)
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def get_categories(self, sort='name', ids=None, icon_map=None):
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start = time.time()
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if icon_map is not None and type(icon_map) != TagsIcons:
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raise TypeError('icon_map passed to get_categories must be of type TagIcons')
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if sort not in self.CATEGORY_SORTS:
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raise ValueError('sort ' + sort + ' not a valid value')
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self.books_list_filter.change([] if not ids else ids)
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id_filter = None if not ids else frozenset(ids)
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tb_cats = self.field_metadata
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#### First, build the standard and custom-column categories ####
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tcategories = {}
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tids = {}
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md = []
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# First, build the maps. We need a category->items map and an
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# item -> (item_id, sort_val) map to use in the books loop
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for category in tb_cats.keys():
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cat = tb_cats[category]
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if not cat['is_category'] or cat['kind'] in ['user', 'search']:
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if not cat['is_category'] or cat['kind'] in ['user', 'search'] \
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or category in ['news', 'formats']:
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continue
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# Get the ids for the item values
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if not cat['is_custom']:
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funcs = {
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'authors' : self.get_authors_with_ids,
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'series' : self.get_series_with_ids,
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'publisher': self.get_publishers_with_ids,
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'tags' : self.get_tags_with_ids,
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'rating' : self.get_ratings_with_ids,
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}
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func = funcs.get(category, None)
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if func:
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list = func()
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else:
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raise ValueError(category + ' has no get with ids function')
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else:
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list = self.get_custom_items_with_ids(label=cat['label'])
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tids[category] = {}
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if category == 'authors':
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for l in list:
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(id, val, sort_val) = (l[0], l[1], l[2])
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tids[category][val] = (id, sort_val)
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else:
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for l in list:
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(id, val) = (l[0], l[1])
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tids[category][val] = (id, val)
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# add an empty category to the category map
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tcategories[category] = {}
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# create a list of category/field_index for the books scan to use.
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# This saves iterating through field_metadata for each book
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md.append((category, cat['rec_index'], cat['is_multiple']))
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print 'end phase "collection":', time.time() - start, 'seconds'
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# Now scan every book looking for category items.
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# Code below is duplicated because it shaves off 10% of the loop time
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id_dex = self.FIELD_MAP['id']
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rating_dex = self.FIELD_MAP['rating']
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for book in self.data.iterall():
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if id_filter and book[id_dex] not in id_filter:
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continue
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rating = book[rating_dex]
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# We kept track of all possible category field_map positions above
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for (cat, dex, mult) in md:
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if book[dex] is None:
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continue
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if not mult:
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val = book[dex]
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try:
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(item_id, sort_val) = tids[cat][val] # let exceptions fly
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item = tcategories[cat].get(val, None)
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if not item:
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item = LibraryDatabase2.TCat_Tag(val, sort_val)
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tcategories[cat][val] = item
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item.c += 1
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item.id = item_id
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if rating > 0:
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item.rt += rating
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item.rc += 1
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except:
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prints('get_categories: item', val, 'is not in', cat, 'list!')
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else:
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vals = book[dex].split(mult)
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for val in vals:
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try:
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(item_id, sort_val) = tids[cat][val] # let exceptions fly
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item = tcategories[cat].get(val, None)
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if not item:
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item = LibraryDatabase2.TCat_Tag(val, sort_val)
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tcategories[cat][val] = item
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item.c += 1
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item.id = item_id
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if rating > 0:
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item.rt += rating
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item.rc += 1
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except:
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prints('get_categories: item', val, 'is not in', cat, 'list!')
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print 'end phase "books":', time.time() - start, 'seconds'
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# Now do news
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tcategories['news'] = {}
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cat = tb_cats['news']
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tn = cat['table']
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categories[category] = [] #reserve the position in the ordered list
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if tn is None: # Nothing to do for the moment
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continue
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cn = cat['column']
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if ids is None:
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query = '''SELECT id, {0}, count, avg_rating, sort
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@ -1065,17 +1179,30 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
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else:
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query = '''SELECT id, {0}, count, avg_rating, sort
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FROM tag_browser_filtered_{1}'''.format(cn, tn)
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if sort == 'popularity':
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query += ' ORDER BY count DESC, sort ASC'
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elif sort == 'name':
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query += ' ORDER BY sort COLLATE icucollate'
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else:
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query += ' ORDER BY avg_rating DESC, sort ASC'
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# results will be sorted later
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data = self.conn.get(query)
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for r in data:
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item = LibraryDatabase2.TCat_Tag(r[1], r[1])
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item.set_all(c=r[2], rt=r[2]*r[3], rc=r[2], id=r[0])
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tcategories['news'][r[1]] = item
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print 'end phase "news":', time.time() - start, 'seconds'
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# Build the real category list by iterating over the temporary copy
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# and building the Tag instances.
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categories = {}
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for category in tb_cats.keys():
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if category not in tcategories:
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continue
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cat = tb_cats[category]
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# prepare the place where we will put the array of Tags
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categories[category] = []
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# icon_map is not None if get_categories is to store an icon and
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# possibly a tooltip in the tag structure.
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icon, tooltip = None, ''
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icon = None
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tooltip = ''
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label = tb_cats.key_to_label(category)
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if icon_map:
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if not tb_cats.is_custom_field(category):
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@ -1087,23 +1214,40 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
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tooltip = self.custom_column_label_map[label]['name']
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datatype = cat['datatype']
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avgr = itemgetter(3)
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item_not_zero_func = lambda x: x[2] > 0
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avgr = lambda x: 0.0 if x.rc == 0 else x.rt/x.rc
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# Duplicate the build of items below to avoid using a lambda func
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# in the main Tag loop. Saves a few %
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if datatype == 'rating':
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# eliminate the zero ratings line as well as count == 0
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item_not_zero_func = (lambda x: x[1] > 0 and x[2] > 0)
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formatter = (lambda x:u'\u2605'*int(x/2))
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avgr = itemgetter(1)
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avgr = lambda x : x.n
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# eliminate the zero ratings line as well as count == 0
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items = [v for v in tcategories[category].values() if v.c > 0 and v.n != 0]
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elif category == 'authors':
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# Clean up the authors strings to human-readable form
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formatter = (lambda x: x.replace('|', ','))
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items = [v for v in tcategories[category].values() if v.c > 0]
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else:
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formatter = (lambda x:unicode(x))
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items = [v for v in tcategories[category].values() if v.c > 0]
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categories[category] = [Tag(formatter(r[1]), count=r[2], id=r[0],
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avg=avgr(r), sort=r[4], icon=icon,
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# sort the list
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if sort == 'name':
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kf = lambda x: sort_key(x.s) if isinstance(x.s, unicode) else x.s
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reverse=False
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elif sort == 'popularity':
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kf = lambda x: x.c
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reverse=True
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else:
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kf = avgr
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reverse=True
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items.sort(key=kf, reverse=reverse)
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categories[category] = [Tag(formatter(r.n), count=r.c, id=r.id,
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avg=avgr(r), sort=r.s, icon=icon,
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tooltip=tooltip, category=category)
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for r in data if item_not_zero_func(r)]
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for r in items]
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print 'end phase "tags list":', time.time() - start, 'seconds'
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# Needed for legacy databases that have multiple ratings that
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# map to n stars
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@ -1189,8 +1333,13 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
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icon_map['search'] = icon_map['search']
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categories['search'] = items
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t = time.time() - start
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print 'get_categories ran in:', t, 'seconds'
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return categories
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############# End get_categories
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def tags_older_than(self, tag, delta):
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tag = tag.lower().strip()
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now = nowf()
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@ -1486,6 +1635,12 @@ class LibraryDatabase2(LibraryDatabase, SchemaUpgrade, CustomColumns):
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# Note: we generally do not need to refresh_ids because library_view will
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# refresh everything.
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def get_ratings_with_ids(self):
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result = self.conn.get('SELECT id,rating FROM ratings')
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if not result:
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return []
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return result
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def dirty_books_referencing(self, field, id, commit=True):
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# Get the list of books to dirty -- all books that reference the item
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table = self.field_metadata[field]['table']
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