python事件信号调度，python事件调度,#idle_queue.

python事件信号调度，python事件调度,#idle_queue.

#idle_queue.pyimport Queue#Global queue, import it from anywhere, you get the same object instance.idle_loop = Queue.Queue()def idle_add(func, *args, **kwargs):    def idle():        func(*args, **kwargs)        return False    idle_loop.put(idle)#weak_ref.pyimport weakrefclass _BoundMethodWeakref:    def __init__(self, func):        self.func_name = func.__name__        self.wref = weakref.ref(func.__self__) #__self__ returns the class    def __call__(self):        func_cls = self.wref()        if func_cls is None: #lost reference            return None        else:            func = getattr(func_cls, self.func_name)            return funcdef weak_ref(callback):    if hasattr(callback, '__self__') and callback.__self__ is not None: #is a bound method?        return _BoundMethodWeakref(callback)    else:        return weakref.ref(callback)#event.pyimport threading#import logging#logger = logging.getLogger(__name__)import idle_queuefrom weak_ref import weak_refclass Event:    def __init__(self, name):        self.name = name        self.callbacks = []        self.lock = threading.Lock()    def connect(self, callback):        with self.lock:            callback = weak_ref(callback)            self.callbacks.append(callback)    def disconnect(self, callback):        with self.lock:            for index, weakref_callback in enumerate(self.callbacks):                if callback == weakref_callback():                    del self.callbacks[index]                    break    def emit(self, *args, **kwargs):        with self.lock:            #logger.debug("Event emitted: {}".format(self.name))            for weakref_callback in self.callbacks[:]:                callback = weakref_callback()                if callback is not None:                    idle_queue.idle_add(callback, *args, **kwargs)                else: #lost reference                    self.callbacks.remove(weakref_callback)            #if not self.callbacks:                #logger.debug("No signals assosiated to: {}".format(self.name))#events.pyimport Eventclass _Events:    #add some signals, example:    #do_something = Event('do something') #args: my_arg1, my_arg_list2, my_arg_str3    quit_app = Event('quit app') #args: some_argevents = _Events()if __name__ == "__main__":    def quit(some_arg):        print some_arg        sys.exit(0)    events.quit_app.connect(quit) #connect the callback/slot    #events.quit_app.disconnect(quit) #disconnect    something = "goodbye"    events.quit_app.emit(something) #emit the signal    #this should go in your main thread loop if your are using a gui.    #example: http://code.activestate.com/recipes/578299-pyqt-pyside-thread-safe-global-queue-main-loop-int/    callback = idle_loop.get()    callback() #dispatch the event