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# ================================================================================
# Copyright (c) 2018 AT&T Intellectual Property. All rights reserved.
# ================================================================================
# 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.
# ============LICENSE_END=========================================================
#
# ECOMP is a trademark and service mark of AT&T Intellectual Property.
"""periodically callback"""
from threading import Event, Thread
class StepTimer(Thread):
"""call on_time after interval number of seconds, then wait to continue"""
def __init__(self, name, interval, on_time, *args, **kwargs):
Thread.__init__(self, name=name)
self._interval = interval
self._on_time = on_time
self._args = args
self._kwargs = kwargs
self._timeout = Event()
self._paused = Event()
self._continue = Event()
self._finished = Event()
def next(self):
"""continue with the next timeout"""
self._paused.clear()
self._continue.set()
def pause(self):
"""pause the timer"""
self._paused.set()
def stop(self):
"""stop the timer if it hasn't finished yet"""
self._finished.set()
self._timeout.set()
self._continue.set()
def run(self):
"""loop until stopped=finished"""
while True:
self._timeout.wait(self._interval)
if self._finished.is_set():
break
self._timeout.clear()
self._continue.clear()
if not self._paused.is_set():
self._on_time(*self._args, **self._kwargs)
self._continue.wait()
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