228 lines
9.1 KiB
Python
228 lines
9.1 KiB
Python
# Copyright 2013-2015 DataStax, Inc.
|
|
#
|
|
# Licensed under the Apache License, Version 2.0 (the "License");
|
|
# you may not use this file except in compliance with the License.
|
|
# You may obtain a copy of the License at
|
|
#
|
|
# http://www.apache.org/licenses/LICENSE-2.0
|
|
#
|
|
# Unless required by applicable law or agreed to in writing, software
|
|
# distributed under the License is distributed on an "AS IS" BASIS,
|
|
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
# See the License for the specific language governing permissions and
|
|
# limitations under the License.
|
|
|
|
|
|
try:
|
|
import unittest2 as unittest
|
|
except ImportError:
|
|
import unittest # noqa
|
|
from itertools import cycle
|
|
from mock import Mock
|
|
import time
|
|
import threading
|
|
from six.moves.queue import PriorityQueue
|
|
|
|
from cassandra.concurrent import execute_concurrent, execute_concurrent_with_args
|
|
|
|
|
|
class MockResponseResponseFuture():
|
|
"""
|
|
This is a mock ResponseFuture. It is used to allow us to hook into the underlying session
|
|
and invoke callback with various timing.
|
|
"""
|
|
|
|
# a list pending callbacks, these will be prioritized in reverse or normal orderd
|
|
pending_callbacks = PriorityQueue()
|
|
|
|
def __init__(self, reverse):
|
|
|
|
# if this is true invoke callback in the reverse order then what they were insert
|
|
self.reverse = reverse
|
|
# hardcoded to avoid paging logic
|
|
self.has_more_pages = False
|
|
|
|
if(reverse):
|
|
self.priority = 100
|
|
else:
|
|
self.priority = 0
|
|
|
|
def add_callback(self, fn, *args, **kwargs):
|
|
"""
|
|
This is used to add a callback our pending list of callbacks.
|
|
If reverse is specified we will invoke the callback in the opposite order that we added it
|
|
"""
|
|
time_added = time.time()
|
|
self.pending_callbacks.put((self.priority, (fn, args, kwargs, time_added)))
|
|
if not reversed:
|
|
self.priority += 1
|
|
else:
|
|
self.priority -= 1
|
|
|
|
def add_callbacks(self, callback, errback,
|
|
callback_args=(), callback_kwargs=None,
|
|
errback_args=(), errback_kwargs=None):
|
|
|
|
self.add_callback(callback, *callback_args, **(callback_kwargs or {}))
|
|
|
|
def get_next_callback(self):
|
|
return self.pending_callbacks.get()
|
|
|
|
def has_next_callback(self):
|
|
return not self.pending_callbacks.empty()
|
|
|
|
def has_more_pages(self):
|
|
return False
|
|
|
|
def clear_callbacks(self):
|
|
return
|
|
|
|
|
|
class TimedCallableInvoker(threading.Thread):
|
|
"""
|
|
This is a local thread which is runs and invokes all the callbacks on the pending callback queue.
|
|
The slowdown flag can used to invoke random slowdowns in our simulate queries.
|
|
"""
|
|
def __init__(self, handler, slowdown=False):
|
|
super(TimedCallableInvoker, self).__init__()
|
|
self.slowdown = slowdown
|
|
self._stopper = threading.Event()
|
|
self.handler = handler
|
|
|
|
def stop(self):
|
|
self._stopper.set()
|
|
|
|
def stopped(self):
|
|
return self._stopper.isSet()
|
|
|
|
def run(self):
|
|
while(not self.stopped()):
|
|
if(self.handler.has_next_callback()):
|
|
pending_callback = self.handler.get_next_callback()
|
|
priority_num = pending_callback[0]
|
|
if (priority_num % 10) == 0 and self.slowdown:
|
|
self._stopper.wait(.1)
|
|
callback_args = pending_callback[1]
|
|
fn, args, kwargs, time_added = callback_args
|
|
fn(time_added, *args, **kwargs)
|
|
self._stopper.wait(.001)
|
|
return
|
|
|
|
|
|
class ConcurrencyTest((unittest.TestCase)):
|
|
|
|
def test_results_ordering_forward(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
|
|
when queries complete in the order they were executed.
|
|
"""
|
|
self.insert_and_validate_list_results(False, False)
|
|
|
|
def test_results_ordering_reverse(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
|
|
when queries complete in the reverse order they were executed.
|
|
"""
|
|
self.insert_and_validate_list_results(True, False)
|
|
|
|
def test_results_ordering_forward_slowdown(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
|
|
when queries complete in the order they were executed, with slow queries mixed in.
|
|
"""
|
|
self.insert_and_validate_list_results(False, True)
|
|
|
|
def test_results_ordering_reverse_slowdown(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
|
|
when queries complete in the reverse order they were executed, with slow queries mixed in.
|
|
"""
|
|
self.insert_and_validate_list_results(True, True)
|
|
|
|
def test_results_ordering_forward_generator(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
|
|
when queries complete in the order they were executed.
|
|
"""
|
|
self.insert_and_validate_list_generator(False, False)
|
|
|
|
def test_results_ordering_reverse_generator(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
|
|
when queries complete in the reverse order they were executed.
|
|
"""
|
|
self.insert_and_validate_list_generator(True, False)
|
|
|
|
def test_results_ordering_forward_generator_slowdown(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
|
|
when queries complete in the order they were executed, with slow queries mixed in.
|
|
"""
|
|
self.insert_and_validate_list_generator(False, True)
|
|
|
|
def test_results_ordering_reverse_generator_slowdown(self):
|
|
"""
|
|
This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
|
|
when queries complete in the reverse order they were executed, with slow queries mixed in.
|
|
"""
|
|
self.insert_and_validate_list_generator(True, True)
|
|
|
|
def insert_and_validate_list_results(self, reverse, slowdown):
|
|
"""
|
|
This utility method will execute submit various statements for execution using the ConcurrentExecutorListResults,
|
|
then invoke a separate thread to execute the callback associated with the futures registered
|
|
for those statements. The parameters will toggle various timing, and ordering changes.
|
|
Finally it will validate that the results were returned in the order they were submitted
|
|
:param reverse: Execute the callbacks in the opposite order that they were submitted
|
|
:param slowdown: Cause intermittent queries to perform slowly
|
|
"""
|
|
our_handler = MockResponseResponseFuture(reverse=reverse)
|
|
mock_session = Mock()
|
|
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
|
|
[(i, ) for i in range(100)])
|
|
mock_session.execute_async.return_value = our_handler
|
|
|
|
t = TimedCallableInvoker(our_handler, slowdown=slowdown)
|
|
t.start()
|
|
results = execute_concurrent(mock_session, statements_and_params)
|
|
|
|
while(not our_handler.pending_callbacks.empty()):
|
|
time.sleep(.01)
|
|
t.stop()
|
|
self.validate_result_ordering(results)
|
|
|
|
def insert_and_validate_list_generator(self, reverse, slowdown):
|
|
"""
|
|
This utility method will execute submit various statements for execution using the ConcurrentExecutorGenResults,
|
|
then invoke a separate thread to execute the callback associated with the futures registered
|
|
for those statements. The parameters will toggle various timing, and ordering changes.
|
|
Finally it will validate that the results were returned in the order they were submitted
|
|
:param reverse: Execute the callbacks in the opposite order that they were submitted
|
|
:param slowdown: Cause intermittent queries to perform slowly
|
|
"""
|
|
our_handler = MockResponseResponseFuture(reverse=reverse)
|
|
mock_session = Mock()
|
|
statements_and_params = zip(cycle(["INSERT INTO test3rf.test (k, v) VALUES (%s, 0)"]),
|
|
[(i, ) for i in range(100)])
|
|
mock_session.execute_async.return_value = our_handler
|
|
|
|
t = TimedCallableInvoker(our_handler, slowdown=slowdown)
|
|
t.start()
|
|
results = execute_concurrent(mock_session, statements_and_params, results_generator=True)
|
|
|
|
self.validate_result_ordering(results)
|
|
t.stop()
|
|
|
|
def validate_result_ordering(self, results):
|
|
"""
|
|
This method will validate that the timestamps returned from the result are in order. This indicates that the
|
|
results were returned in the order they were submitted for execution
|
|
:param results:
|
|
"""
|
|
last_time_added = 0
|
|
for result in results:
|
|
current_time_added = result[1]
|
|
self.assertLess(last_time_added, current_time_added)
|
|
last_time_added = current_time_added
|
|
|