231 lines
9.2 KiB
Python
231 lines
9.2 KiB
Python
# Copyright 2013-2016 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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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
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from mock import Mock
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import time
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import threading
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from six.moves.queue import PriorityQueue
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from cassandra.concurrent import execute_concurrent, execute_concurrent_with_args
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class MockResponseResponseFuture():
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"""
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This is a mock ResponseFuture. It is used to allow us to hook into the underlying session
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and invoke callback with various timing.
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"""
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_query_trace = None
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_col_names = None
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# a list pending callbacks, these will be prioritized in reverse or normal orderd
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pending_callbacks = PriorityQueue()
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def __init__(self, reverse):
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# if this is true invoke callback in the reverse order then what they were insert
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self.reverse = reverse
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# hardcoded to avoid paging logic
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self.has_more_pages = False
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if(reverse):
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self.priority = 100
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else:
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self.priority = 0
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def add_callback(self, fn, *args, **kwargs):
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"""
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This is used to add a callback our pending list of callbacks.
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If reverse is specified we will invoke the callback in the opposite order that we added it
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"""
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time_added = time.time()
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self.pending_callbacks.put((self.priority, (fn, args, kwargs, time_added)))
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if not reversed:
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self.priority += 1
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else:
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self.priority -= 1
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def add_callbacks(self, callback, errback,
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callback_args=(), callback_kwargs=None,
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errback_args=(), errback_kwargs=None):
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self.add_callback(callback, *callback_args, **(callback_kwargs or {}))
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def get_next_callback(self):
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return self.pending_callbacks.get()
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def has_next_callback(self):
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return not self.pending_callbacks.empty()
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def has_more_pages(self):
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return False
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def clear_callbacks(self):
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return
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class TimedCallableInvoker(threading.Thread):
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"""
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This is a local thread which is runs and invokes all the callbacks on the pending callback queue.
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The slowdown flag can used to invoke random slowdowns in our simulate queries.
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"""
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def __init__(self, handler, slowdown=False):
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super(TimedCallableInvoker, self).__init__()
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self.slowdown = slowdown
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self._stopper = threading.Event()
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self.handler = handler
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def stop(self):
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self._stopper.set()
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def stopped(self):
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return self._stopper.isSet()
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def run(self):
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while(not self.stopped()):
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if(self.handler.has_next_callback()):
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pending_callback = self.handler.get_next_callback()
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priority_num = pending_callback[0]
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if (priority_num % 10) == 0 and self.slowdown:
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self._stopper.wait(.1)
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callback_args = pending_callback[1]
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fn, args, kwargs, time_added = callback_args
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fn([time_added], *args, **kwargs)
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self._stopper.wait(.001)
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return
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class ConcurrencyTest((unittest.TestCase)):
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def test_results_ordering_forward(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
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when queries complete in the order they were executed.
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"""
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self.insert_and_validate_list_results(False, False)
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def test_results_ordering_reverse(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
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when queries complete in the reverse order they were executed.
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"""
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self.insert_and_validate_list_results(True, False)
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def test_results_ordering_forward_slowdown(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
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when queries complete in the order they were executed, with slow queries mixed in.
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"""
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self.insert_and_validate_list_results(False, True)
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def test_results_ordering_reverse_slowdown(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorListResults
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when queries complete in the reverse order they were executed, with slow queries mixed in.
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"""
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self.insert_and_validate_list_results(True, True)
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def test_results_ordering_forward_generator(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
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when queries complete in the order they were executed.
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"""
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self.insert_and_validate_list_generator(False, False)
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def test_results_ordering_reverse_generator(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
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when queries complete in the reverse order they were executed.
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"""
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self.insert_and_validate_list_generator(True, False)
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def test_results_ordering_forward_generator_slowdown(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
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when queries complete in the order they were executed, with slow queries mixed in.
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"""
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self.insert_and_validate_list_generator(False, True)
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def test_results_ordering_reverse_generator_slowdown(self):
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"""
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This tests the ordering of our various concurrent generator class ConcurrentExecutorGenResults
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when queries complete in the reverse order they were executed, with slow queries mixed in.
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"""
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self.insert_and_validate_list_generator(True, True)
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def insert_and_validate_list_results(self, reverse, slowdown):
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"""
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This utility method will execute submit various statements for execution using the ConcurrentExecutorListResults,
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then invoke a separate thread to execute the callback associated with the futures registered
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for those statements. The parameters will toggle various timing, and ordering changes.
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Finally it will validate that the results were returned in the order they were submitted
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:param reverse: Execute the callbacks in the opposite order that they were submitted
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:param slowdown: Cause intermittent queries to perform slowly
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"""
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our_handler = MockResponseResponseFuture(reverse=reverse)
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mock_session = Mock()
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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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mock_session.execute_async.return_value = our_handler
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t = TimedCallableInvoker(our_handler, slowdown=slowdown)
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t.start()
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results = execute_concurrent(mock_session, statements_and_params)
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while(not our_handler.pending_callbacks.empty()):
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time.sleep(.01)
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t.stop()
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self.validate_result_ordering(results)
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def insert_and_validate_list_generator(self, reverse, slowdown):
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"""
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This utility method will execute submit various statements for execution using the ConcurrentExecutorGenResults,
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then invoke a separate thread to execute the callback associated with the futures registered
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for those statements. The parameters will toggle various timing, and ordering changes.
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Finally it will validate that the results were returned in the order they were submitted
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:param reverse: Execute the callbacks in the opposite order that they were submitted
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:param slowdown: Cause intermittent queries to perform slowly
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"""
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our_handler = MockResponseResponseFuture(reverse=reverse)
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mock_session = Mock()
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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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mock_session.execute_async.return_value = our_handler
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t = TimedCallableInvoker(our_handler, slowdown=slowdown)
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t.start()
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results = execute_concurrent(mock_session, statements_and_params, results_generator=True)
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self.validate_result_ordering(results)
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t.stop()
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def validate_result_ordering(self, results):
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"""
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This method will validate that the timestamps returned from the result are in order. This indicates that the
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results were returned in the order they were submitted for execution
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:param results:
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"""
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last_time_added = 0
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for success, result in results:
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self.assertTrue(success)
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current_time_added = list(result)[0]
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self.assertLess(last_time_added, current_time_added)
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last_time_added = current_time_added
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