| # Copyright 2015, Google Inc. |
| # All rights reserved. |
| # |
| # Redistribution and use in source and binary forms, with or without |
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| # * Redistributions in binary form must reproduce the above |
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| # in the documentation and/or other materials provided with the |
| # distribution. |
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| # this software without specific prior written permission. |
| # |
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| |
| """Tests of the later module.""" |
| |
| import threading |
| import time |
| import unittest |
| |
| from grpc.framework.foundation import later |
| |
| TICK = 0.1 |
| |
| |
| class LaterTest(unittest.TestCase): |
| |
| def test_simple_delay(self): |
| lock = threading.Lock() |
| cell = [0] |
| return_value = object() |
| |
| def computation(): |
| with lock: |
| cell[0] += 1 |
| return return_value |
| computation_future = later.later(TICK * 2, computation) |
| |
| self.assertFalse(computation_future.done()) |
| self.assertFalse(computation_future.cancelled()) |
| time.sleep(TICK) |
| self.assertFalse(computation_future.done()) |
| self.assertFalse(computation_future.cancelled()) |
| with lock: |
| self.assertEqual(0, cell[0]) |
| time.sleep(TICK * 2) |
| self.assertTrue(computation_future.done()) |
| self.assertFalse(computation_future.cancelled()) |
| with lock: |
| self.assertEqual(1, cell[0]) |
| self.assertEqual(return_value, computation_future.result()) |
| |
| def test_callback(self): |
| lock = threading.Lock() |
| cell = [0] |
| callback_called = [False] |
| future_passed_to_callback = [None] |
| def computation(): |
| with lock: |
| cell[0] += 1 |
| computation_future = later.later(TICK * 2, computation) |
| def callback(outcome): |
| with lock: |
| callback_called[0] = True |
| future_passed_to_callback[0] = outcome |
| computation_future.add_done_callback(callback) |
| time.sleep(TICK) |
| with lock: |
| self.assertFalse(callback_called[0]) |
| time.sleep(TICK * 2) |
| with lock: |
| self.assertTrue(callback_called[0]) |
| self.assertTrue(future_passed_to_callback[0].done()) |
| |
| callback_called[0] = False |
| future_passed_to_callback[0] = None |
| |
| computation_future.add_done_callback(callback) |
| with lock: |
| self.assertTrue(callback_called[0]) |
| self.assertTrue(future_passed_to_callback[0].done()) |
| |
| def test_cancel(self): |
| lock = threading.Lock() |
| cell = [0] |
| callback_called = [False] |
| future_passed_to_callback = [None] |
| def computation(): |
| with lock: |
| cell[0] += 1 |
| computation_future = later.later(TICK * 2, computation) |
| def callback(outcome): |
| with lock: |
| callback_called[0] = True |
| future_passed_to_callback[0] = outcome |
| computation_future.add_done_callback(callback) |
| time.sleep(TICK) |
| with lock: |
| self.assertFalse(callback_called[0]) |
| computation_future.cancel() |
| self.assertTrue(computation_future.cancelled()) |
| self.assertFalse(computation_future.running()) |
| self.assertTrue(computation_future.done()) |
| with lock: |
| self.assertTrue(callback_called[0]) |
| self.assertTrue(future_passed_to_callback[0].cancelled()) |
| |
| def test_result(self): |
| lock = threading.Lock() |
| cell = [0] |
| callback_called = [False] |
| future_passed_to_callback_cell = [None] |
| return_value = object() |
| |
| def computation(): |
| with lock: |
| cell[0] += 1 |
| return return_value |
| computation_future = later.later(TICK * 2, computation) |
| |
| def callback(future_passed_to_callback): |
| with lock: |
| callback_called[0] = True |
| future_passed_to_callback_cell[0] = future_passed_to_callback |
| computation_future.add_done_callback(callback) |
| returned_value = computation_future.result() |
| self.assertEqual(return_value, returned_value) |
| |
| # The callback may not yet have been called! Sleep a tick. |
| time.sleep(TICK) |
| with lock: |
| self.assertTrue(callback_called[0]) |
| self.assertEqual(return_value, future_passed_to_callback_cell[0].result()) |
| |
| if __name__ == '__main__': |
| unittest.main(verbosity=2) |