downloadhandlers.py 文件源码

def __init__(self, settings):
        self.options = settings.get('PHANTOMJS_OPTIONS', {})  # ???
        max_run = settings.get('PHANTOMJS_MAXRUN', 10)  # PhantomJS ???????????, ??10
        self.sem = defer.DeferredSemaphore(max_run)
        self.queue = Queue.LifoQueue(maxsize=max_run)  # LifoQueue ??????
        SignalManager(dispatcher.Any).connect(receiver=self._close, signal=signals.spider_closed)