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"""Tests for grpc.framework.foundation.logging_pool."""

import threading
import unittest

from grpc.framework.foundation import logging_pool

_POOL_SIZE = 16


class _CallableObject(object):

  def __init__(self):
    self._lock = threading.Lock()
    self._passed_values = []

  def __call__(self, value):
    with self._lock:
      self._passed_values.append(value)

  def passed_values(self):
    with self._lock:
      return tuple(self._passed_values)


class LoggingPoolTest(unittest.TestCase):

  def testUpAndDown(self):
    pool = logging_pool.pool(_POOL_SIZE)
    pool.shutdown(wait=True)

    with logging_pool.pool(_POOL_SIZE) as pool:
      self.assertIsNotNone(pool)

  def testTaskExecuted(self):
    test_list = []

    with logging_pool.pool(_POOL_SIZE) as pool:
      pool.submit(lambda: test_list.append(object())).result()

    self.assertTrue(test_list)

  def testException(self):
    with logging_pool.pool(_POOL_SIZE) as pool:
      raised_exception = pool.submit(lambda: 1/0).exception()

    self.assertIsNotNone(raised_exception)

  def testCallableObjectExecuted(self):
    callable_object = _CallableObject()
    passed_object = object()
    with logging_pool.pool(_POOL_SIZE) as pool:
      future = pool.submit(callable_object, passed_object)
    self.assertIsNone(future.result())
    self.assertSequenceEqual((passed_object,), callable_object.passed_values())


if __name__ == '__main__':
  unittest.main(verbosity=2)
