mirror of
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108 lines
3.8 KiB
Python
108 lines
3.8 KiB
Python
#!/usr/bin/python
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# -*- coding: utf-8 -*-
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"""!
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____ ____ ______ __ __ __ _____
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/ __ )/ __ \/ ___/ | / /___ _/ /______/ /_ |__ /
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/ __ / / / /\__ \| | /| / / __ `/ __/ ___/ __ \ /_ <
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/ /_/ / /_/ /___/ /| |/ |/ / /_/ / /_/ /__/ / / / ___/ /
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/_____/\____//____/ |__/|__/\__,_/\__/\___/_/ /_/ /____/
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German BOS Information Script
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by Bastian Schroll
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@file: timer.py
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@date: 21.09.2018
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@author: Bastian Schroll
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@description: Timer class for interval timed events
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"""
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import logging
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import time
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from threading import Thread, Event
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logging.debug("- %s loaded", __name__)
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class RepeatedTimer:
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def __init__(self, interval, targetFunction, *args, **kwargs):
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"""!Create a new instance of the RepeatedTimer
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@param interval: interval in sec. to recall target function
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@param targetFunction: function to call on timer event
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@param *args: arguments for the called function
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@param *kwargs: keyword arguments for the called function
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"""
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self._interval = interval
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self._function = targetFunction
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self._args = args
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self._kwargs = kwargs
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self._start = 0
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self.overdueCount = 0
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self.lostEvents = 0
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self._isRunning = False
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self._event = Event()
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self._thread = None
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def start(self):
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"""!Start a new timer worker thread
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@return True or False"""
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if self._thread is None:
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self._event.clear()
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self._thread = Thread(target=self._target)
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self._thread.name = "RepTim(" + str(self._interval) + ")"
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self._thread.daemon = True # start as daemon (thread dies if main program ends)
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self._thread.start()
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logging.debug("start repeatedTimer: %s", self._thread.name)
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return True
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logging.debug("repeatedTimer always started")
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return True
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def stop(self):
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"""!Stop the timer worker thread
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@return True or False"""
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if self._thread is not None:
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logging.debug("stop repeatedTimer: %s", self._thread.name)
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self._event.set()
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if self._thread is not None:
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self._thread.join()
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return True
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logging.warning("repeatedTimer always stopped")
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return True
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def _target(self):
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"""!Runs the target function with his arguments in own thread"""
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self._start = time.time()
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while not self._event.wait(self.restTime):
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logging.debug("work")
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startTime = time.time()
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try:
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self._function(*self._args, **self._kwargs)
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except: # pragma: no cover
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logging.exception("target throws an exception")
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runTime = time.time() - startTime
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if runTime < self._interval:
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logging.debug("ready after: %0.3f sec. - next call in: %0.3f sec.", runTime, self.restTime)
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else:
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lostEvents = int(runTime / self._interval)
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logging.warning("timer overdue! interval: %0.3f sec. - runtime: %0.3f sec. - "
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"%d events lost - next call in: %0.3f sec.", self._interval, runTime, lostEvents, self.restTime)
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self.lostEvents += lostEvents
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self.overdueCount += 1
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logging.debug("repeatedTimer thread stopped: %s", self._thread.name)
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self._thread = None # set to none after leave teh thread (running recognize)
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@property
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def isRunning(self):
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"""!Property for repeatedTimer running state"""
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if self._thread:
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return True
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return False
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@property
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def restTime(self):
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"""!Property to get remaining time till next call"""
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return self._interval - ((time.time() - self._start) % self._interval)
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