def test_reset_resets_timestamp_and_samples_taken(self):
mock_time = MockTime()
new_time = 1345576088.71
guesstimator = Guesstimator(redis_host='localhost', random=MockRandom(), time=mock_time, environment='test')
guesstimator.create_sample_set(
name='100-percent-sample',
recording_frequency=1.0
)
guesstimator.record('100-percent-sample')
guesstimator.record('100-percent-sample')
timestamp, samples_taken = guesstimator.read('100-percent-sample')
self.assertEqual( '2', self.redis.hget( guesstimator._get_hash_key('100-percent-sample'), 'samples_taken' ) )
self.assertFalse( timestamp == new_time )
mock_time.time = new_time
guesstimator.reset('100-percent-sample')
timestamp, samples_taken = guesstimator.read('100-percent-sample')
self.assertEqual( '0', self.redis.hget( guesstimator._get_hash_key('100-percent-sample'), 'samples_taken' ) )
self.assertEqual( new_time, timestamp )
def test_read_returns_a_timestamp_and_an_estimation_of_the_number_of_samples_taken(self):
mock_time = MockTime()
guesstimator = Guesstimator(redis_host='localhost', random=MockRandom(), time=mock_time, environment='test')
guesstimator.create_sample_set(
name='50-percent-sample',
recording_frequency=0.5
)
guesstimator.record('50-percent-sample')
guesstimator.record('50-percent-sample')
guesstimator.record('50-percent-sample')
guesstimator.record('50-percent-sample')
timestamp, samples_taken = guesstimator.read('50-percent-sample')
self.assertEqual(4, samples_taken)
self.assertEqual(mock_time.time, timestamp)
guesstimator.create_sample_set(
name='25-percent-sample',
recording_frequency=0.25
)
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
timestamp, samples_taken = guesstimator.read('25-percent-sample')
self.assertEqual(8, samples_taken)
def test_record_increments_the_number_of_samples_taken_with_the_appropriate_frequency(self):
guesstimator = Guesstimator(redis_host='localhost', random=MockRandom(), environment='test')
guesstimator.create_sample_set(
name='100-percent-sample',
recording_frequency=1.0
)
guesstimator.record('100-percent-sample')
guesstimator.record('100-percent-sample')
self.assertEqual( '2', self.redis.hget( guesstimator._get_hash_key('100-percent-sample'), 'samples_taken' ) )
guesstimator.create_sample_set(
name='50-percent-sample',
recording_frequency=0.5
)
guesstimator.record('50-percent-sample')
guesstimator.record('50-percent-sample')
guesstimator.record('50-percent-sample')
guesstimator.record('50-percent-sample')
self.assertEqual( '3', self.redis.hget( guesstimator._get_hash_key('50-percent-sample'), 'samples_taken' ) )
guesstimator.create_sample_set(
name='25-percent-sample',
recording_frequency=0.25
)
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
guesstimator.record('25-percent-sample')
self.assertEqual( '2', self.redis.hget( guesstimator._get_hash_key('25-percent-sample'), 'samples_taken' ) )
from guesstimator import Guesstimator
from redis import Redis
guesstimator = Guesstimator(environment="example")
sample_set_name = "count-operations"
redis = Redis("localhost")
last_operations_count = 0
# Initialize a sample set, this should only be done once.
if not sample_set_name in guesstimator.list_sample_sets():
guesstimator.create_sample_set(name=sample_set_name)
while True:
# Record that an operation has occurred.
guesstimator.record(sample_set_name)
# our operation happens to be an increment in Redis, it could be anything.
# this is a convenient operation because it lets us keep track of the
# true number of total operations across multiple workers.
operations = redis.incr("guesstimator_example_actual_operation_count")
# reader.py must have reset the operation count.
if last_operations_count > operations:
guesstimator.writes_performed = 0
last_operations_count = operations
if (operations % 10000) == 0:
# Read the timestamp since metrics started being tracked.
# and the estimated number of samples taken.
