queue.py 文件源码

def push(self, message):
        """ Push a new message. """
        if self.overflow_mode == 'drop':
            if self.max_length > -1 and self.get_length() >= self.max_length:
                return
            if self.max_size > -1 and self.get_size() >= self.max_size:
                return

        with open(self.file_path, 'a') as fd:
            # Let's hold an exclusive lock.
            fcntl.flock(fd, fcntl.LOCK_EX)
            fd.write(message.serialize())
            fcntl.flock(fd, fcntl.LOCK_UN)
            fd.close()

        if self.overflow_mode == 'slide':
            if self.max_size == -1 and self.max_length > -1:
                while self.get_length() > self.max_length:
                    self.shift()
            elif self.max_size > -1 and self.max_length == -1:
                while self.get_size() > self.max_size:
                    self.shift()