Django source code analysis

Timer scene

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 = [
                     # Market homepage data cache
                     CustomTimer(1.0, timed_refresh_market_home_page_data),
                     # Invitation ranking event switch cache
                     CustomTimer(1.0, timed_refresh_invite_leaderboard_activity_switch_data),

                 ]
                 # Start caching
                 for t in timer_list:
                     t.start()
                 while True:
                     if not get_execute_flag():
                         # Cancel scheduled caching
                         for t in timer_list:
                             t.cancel()
                         break
                     time.sleep(5)
         except:
             write_error_log(\'main\')
         finally:
             time.sleep(5)

timer source code

First analyze the wait source code

When wait is used, lock’s wait