/
utils.py
39 lines (33 loc) · 1.37 KB
/
utils.py
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# Copyright 2012 MemSQL, 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.
import time
class Reporter(object):
'''A utility class that can report the number of actions per second to a
listening master process over a pipe.'''
def __init__(self, pipe):
'''Initialize the reporter, writing on given pipe.'''
self.pipe = pipe
self.count = 0
self.start_time = time.time()
def mark_event(self):
'''Mark that an event has occurred, automatically reporting the number
of actions per second to the master.'''
self.count += 1
if time.time() - self.start_time > 1.0:
self.report()
def report(self):
'''Recalculate and send the number of actions per second.'''
self.pipe.send(self.count / (time.time() - self.start_time))
self.start_time = time.time()
self.count = 0