事件驱动引擎
| 12 | |
| 13 | |
| 14 | class EventEngine: |
| 15 | """事件驱动引擎""" |
| 16 | |
| 17 | def __init__(self): |
| 18 | """初始化事件引擎""" |
| 19 | # 事件队列 |
| 20 | self.__queue = Queue() |
| 21 | |
| 22 | # 事件引擎开关 |
| 23 | self.__active = False |
| 24 | |
| 25 | # 事件引擎处理线程 |
| 26 | self.__thread = Thread(target=self.__run, name="EventEngine.__thread") |
| 27 | |
| 28 | # 事件字典，key 为时间， value 为对应监听事件函数的列表 |
| 29 | self.__handlers = defaultdict(list) |
| 30 | |
| 31 | def __run(self): |
| 32 | """启动引擎""" |
| 33 | while self.__active: |
| 34 | try: |
| 35 | event = self.__queue.get(block=True, timeout=1) |
| 36 | handle_thread = Thread(target=self.__process, name="EventEngine.__process", args=(event,)) |
| 37 | handle_thread.start() |
| 38 | except Empty: |
| 39 | pass |
| 40 | |
| 41 | def __process(self, event): |
| 42 | """事件处理""" |
| 43 | # 检查该事件是否有对应的处理函数 |
| 44 | if event.event_type in self.__handlers: |
| 45 | # 若存在,则按顺序将时间传递给处理函数执行 |
| 46 | for handler in self.__handlers[event.event_type]: |
| 47 | handler(event) |
| 48 | |
| 49 | def start(self): |
| 50 | """引擎启动""" |
| 51 | self.__active = True |
| 52 | self.__thread.start() |
| 53 | |
| 54 | def stop(self): |
| 55 | """停止引擎""" |
| 56 | self.__active = False |
| 57 | self.__thread.join() |
| 58 | |
| 59 | def register(self, event_type, handler): |
| 60 | """注册事件处理函数监听""" |
| 61 | if handler not in self.__handlers[event_type]: |
| 62 | self.__handlers[event_type].append(handler) |
| 63 | |
| 64 | def unregister(self, event_type, handler): |
| 65 | """注销事件处理函数""" |
| 66 | handler_list = self.__handlers.get(event_type) |
| 67 | if handler_list is None: |
| 68 | return |
| 69 | if handler in handler_list: |
| 70 | handler_list.remove(handler) |
| 71 | if len(handler_list) == 0: |
no outgoing calls