def paginator_and_page(self, cache, buf_size=CACHE_CHUNK_SIZE):
paginator = BufferedPaginator(count=cache['count'], offset=cache['offset'],
buf_size=buf_size, per_page=cache['per_page'])
try:
page = paginator.page(cache['page_num'])
except (EmptyPage, InvalidPage):
page = paginator.page(paginator.num_pages)
return paginator, page
def test_overlap(self):
kwargs = {
'count': 100,
'offset': 50,
'buf_size': 10,
'object_list': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
'per_page': 2
}
bp = BufferedPaginator(**kwargs)
# use paginator's buf_size
self.assertEqual(bp.get_overlap(45), (True, (45, 5), (None, None)))
self.assertEqual(bp.get_overlap(47), (True, (47, 3), (None, None)))
self.assertEqual(bp.get_overlap(55), (True, (None, None), (61, 5)))
self.assertEqual(bp.get_overlap(52), (True, (None, None), (61, 2)))
self.assertEqual(bp.get_overlap(20), (False, (20, 10), (None, None)))
self.assertEqual(bp.get_overlap(70), (False, (70, 10), (None, None)))
# explicit buf_size
self.assertEqual(bp.get_overlap(47, 14), (True, (47, 3), (61, 1)))
self.assertEqual(bp.get_overlap(20, 100), (True, (20, 30), (61, 60)))
self.assertEqual(bp.get_overlap(55, 12), (True, (None, None), (61, 7)))
self.assertEqual(bp.get_overlap(20, 8), (False, (20, 8), (None, None)))
self.assertEqual(bp.get_overlap(70, 3), (False, (70, 3), (None, None)))
def test_base(self):
kwargs = {
'count': 100,
'offset': 0,
'buf_size': 10,
'object_list': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
'per_page': 2
}
bp = BufferedPaginator(**kwargs)
self.assertEqual(bp.num_pages, 50)
self.assertEqual(bp.cached_page_indices(), (1, 6))
self.assertEqual(bp.cached_pages(), 5)
self.assertTrue(bp.page(2).in_cache())
self.assertFalse(bp.page(6).in_cache())
def test_partial(self):
kwargs = {
'count': 20,
'offset': 0,
'buf_size': 10,
'object_list': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
'per_page': 40
}
bp = BufferedPaginator(**kwargs)
self.assertEqual(bp.num_pages, 1)
self.assertEqual(bp.cached_page_indices(), (1, 2))
self.assertEqual(bp.cached_pages(), 1)
p1 = bp.page(1)
self.assertTrue(p1.in_cache())
self.assertEqual((p1.start_index(), p1.end_index()), (1, 20))
self.assertEqual(p1.object_list, kwargs['object_list'])
kwargs['offset'] = 10
bp = BufferedPaginator(**kwargs)
self.assertEqual(bp.num_pages, 1)
self.assertEqual(bp.cached_page_indices(), (0, 0))
self.assertEqual(bp.cached_pages(), 0)
def test_offset(self):
kwargs = {
'count': 100,
'offset': 40,
'buf_size': 10,
'object_list': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9],
'per_page': 2
}
bp = BufferedPaginator(**kwargs)
self.assertEqual(bp.num_pages, 50)
self.assertEqual(bp.cached_page_indices(), (21, 26))
self.assertEqual(bp.cached_pages(), 5)
self.assertFalse(bp.page(20).in_cache())
self.assertTrue(bp.page(21).in_cache())
self.assertFalse(bp.page(26).in_cache())
# try as a negative offset
kwargs['offset'] = -60
bp = BufferedPaginator(**kwargs)
self.assertEqual(bp.num_pages, 50)
self.assertEqual(bp.cached_page_indices(), (21, 26))
self.assertEqual(bp.cached_pages(), 5)
self.assertFalse(bp.page(20).in_cache())
self.assertTrue(bp.page(21).in_cache())
self.assertFalse(bp.page(26).in_cache())
