127 lines
4.8 KiB
Python
127 lines
4.8 KiB
Python
# Copyright 2013-2014 DataStax, Inc.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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from tests.integration import PROTOCOL_VERSION
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import logging
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log = logging.getLogger(__name__)
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try:
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import unittest2 as unittest
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except ImportError:
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import unittest # noqa
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from itertools import cycle, count
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from threading import Event
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from cassandra.cluster import Cluster
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from cassandra.concurrent import execute_concurrent
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from cassandra.policies import HostDistance
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from cassandra.query import SimpleStatement
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class QueryPagingTests(unittest.TestCase):
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def setUp(self):
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if PROTOCOL_VERSION < 2:
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raise unittest.SkipTest(
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"Protocol 2.0+ is required for BATCH operations, currently testing against %r"
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% (PROTOCOL_VERSION,))
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self.cluster = Cluster(protocol_version=PROTOCOL_VERSION)
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self.cluster.set_core_connections_per_host(HostDistance.LOCAL, 1)
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self.session = self.cluster.connect()
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self.session.execute("TRUNCATE test3rf.test")
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def test_paging(self):
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statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
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[(i, ) for i in range(100)])
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execute_concurrent(self.session, statements_and_params)
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prepared = self.session.prepare("SELECT * FROM test3rf.test")
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for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
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self.session.default_fetch_size = fetch_size
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self.assertEqual(100, len(list(self.session.execute("SELECT * FROM test3rf.test"))))
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statement = SimpleStatement("SELECT * FROM test3rf.test")
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self.assertEqual(100, len(list(self.session.execute(statement))))
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self.assertEqual(100, len(list(self.session.execute(prepared))))
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def test_async_paging(self):
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statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
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[(i, ) for i in range(100)])
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execute_concurrent(self.session, statements_and_params)
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prepared = self.session.prepare("SELECT * FROM test3rf.test")
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for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
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self.session.default_fetch_size = fetch_size
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self.assertEqual(100, len(list(self.session.execute_async("SELECT * FROM test3rf.test").result())))
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statement = SimpleStatement("SELECT * FROM test3rf.test")
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self.assertEqual(100, len(list(self.session.execute_async(statement).result())))
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self.assertEqual(100, len(list(self.session.execute_async(prepared).result())))
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def test_paging_callbacks(self):
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statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
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[(i, ) for i in range(100)])
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execute_concurrent(self.session, statements_and_params)
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prepared = self.session.prepare("SELECT * FROM test3rf.test")
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for fetch_size in (2, 3, 7, 10, 99, 100, 101, 10000):
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self.session.default_fetch_size = fetch_size
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future = self.session.execute_async("SELECT * FROM test3rf.test")
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event = Event()
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counter = count()
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def handle_page(rows, future, counter):
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for row in rows:
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counter.next()
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if future.has_more_pages:
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future.start_fetching_next_page()
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else:
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event.set()
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def handle_error(err):
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event.set()
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self.fail(err)
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future.add_callbacks(callback=handle_page, callback_args=(future, counter), errback=handle_error)
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event.wait()
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self.assertEquals(counter.next(), 100)
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# simple statement
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future = self.session.execute_async(SimpleStatement("SELECT * FROM test3rf.test"))
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event.clear()
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counter = count()
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future.add_callbacks(callback=handle_page, callback_args=(future, counter), errback=handle_error)
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event.wait()
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self.assertEquals(counter.next(), 100)
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# prepared statement
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future = self.session.execute_async(prepared)
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event.clear()
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counter = count()
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future.add_callbacks(callback=handle_page, callback_args=(future, counter), errback=handle_error)
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event.wait()
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self.assertEquals(counter.next(), 100)
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