<s> """<STR_LIT>""" <EOL> import heapq <EOL> import threading <EOL> import time <EOL> class _Event ( object ) : <EOL> def __init__ ( self , eta , runnable , key ) : <EOL> self . _eta = eta <EOL> self . _runnable = runnable <EOL> self . _key = key <EOL> def __lt__ ( self , other ) : <EOL> return self . eta < other . eta <EOL> def cancel ( self ) : <EOL> self . _runnable = None <EOL> @ property <EOL> def eta ( self ) : <EOL> return self . _eta <EOL> @ property <EOL> def key ( self ) : <EOL> return self . _key <EOL> @ property <EOL> def cancelled ( self ) : <EOL> return self . _runnable is None <EOL> def copy ( self , new_eta ) : <EOL> return _Event ( new_eta , self . _runnable , self . key ) <EOL> def run ( self ) : <EOL> self . _runnable ( ) <EOL> class ScheduledExecutor ( object ) : <EOL> """<STR_LIT>""" <EOL> def __init__ ( self , thread_pool ) : <EOL> self . _thread_pool = thread_pool <EOL> self . _quit_event = threading . Event ( ) <EOL> self . _work_ready_condition = threading . Condition ( ) <EOL> self . _queue = [ ] <EOL> self . _key_to_events = { } <EOL> self . _worker_thread = threading . Thread ( <EOL> target = self . _loop_and_run_scheduled_events , name = "<STR_LIT>" ) <EOL> def start ( self ) : <EOL> self . _worker_thread . start ( ) <EOL> def quit ( self ) : <EOL> self . _quit_event . set ( ) <EOL> with self . _work_ready_condition : <EOL> self . _work_ready_condition . notify ( ) <EOL> def add_event ( self , runnable , eta , key = None ) : <EOL> """<STR_LIT>""" <EOL> event = _Event ( eta , runnable , key ) <EOL> with self . _work_ready_condition : <EOL> if key is not None : <EOL> self . _key_to_events [ key ] = event <EOL> self . _enqueue_event ( event ) <EOL> def update_event ( self , eta , key ) : <EOL> """<STR_LIT>""" <EOL> with self . _work_ready_condition : <EOL> old_event = self . _key_to_events . get ( key ) <EOL> if old_event : <EOL> event = old_event . copy ( eta ) <EOL> old_event . cancel ( ) <EOL> self . _key_to_events [ key ] = event <EOL> self . _enqueue_event ( event ) <EOL> def _enqueue_event ( self , event ) : <EOL> if self . _queue : <EOL> old_next_event_eta = self . _queue [ <NUM_LIT:0> ] . eta <EOL> else : <EOL> old_next_event_eta = event . eta + <NUM_LIT:1> <EOL> heapq . heappush ( self . _queue , event ) <EOL> if event . eta < old_next_event_eta : <EOL> self . _work_ready_condition . notify ( ) <EOL> def _loop_and_run_scheduled_events ( self ) : <EOL> with self . _work_ready_condition : <EOL> while not self . _quit_event . is_set ( ) : <EOL> now = time . time ( ) <EOL> while self . _queue and self . _queue [ <NUM_LIT:0> ] . eta <= now : <EOL> event = heapq . heappop ( self . _queue ) <EOL> if not event . cancelled : <EOL> if event . key : <EOL> del self . _key_to_events [ event . key ] <EOL> self . _work_ready_condition . release ( ) <EOL> self . _thread_pool . submit ( event . run ) <EOL> self . _work_ready_condition . acquire ( ) <EOL> now = time . time ( ) <EOL> if self . _queue : <EOL> self . _work_ready_condition . wait ( self . _queue [ <NUM_LIT:0> ] . eta - now ) <EOL> else : <EOL> self . _work_ready_condition . wait ( ) </s>
