django 源码分析

定时器场景

from threading import Timer

class CustomTimer(Timer):

    def run(self):
        while not self.finished.is_set():
            self.function(*self.args, **self.kwargs)
            self.finished.wait(self.interval)

class Command(BaseCommand):
    def handle(self, *args, **options):
        try:
            if get_execute_flag():
                init_conn()
                timer_list = [
                    # 市场首页数据缓存
                    CustomTimer(1.0, timed_refresh_market_home_page_data),
                    # 邀请排行榜活动开关缓存
                    CustomTimer(1.0, timed_refresh_invite_leaderboard_activity_switch_data),

                ]
                # 开始缓存
                for t in timer_list:
                    t.start()
                while True:
                    if not get_execute_flag():
                        # 取消定时缓存
                        for t in timer_list:
                            t.cancel()
                        break
                    time.sleep(5)
        except:
            write_error_log('main')
        finally:
            time.sleep(5)

timer 源码

 先分析wait源码

 wait使用的时lock的wait