@ClassCaller.method
    class ServerScreenShot():
        busy = False
        wad_size = 256

        def __call__(cls, self):
            if cls.busy:
                print "ServerScreenShot() is busy, wait please."
                return
            cls.busy = True
            cls.width, cls.height, ScreenShot = BigWorld.getScreenCopy()
            cls.counter = 0
            cls.ScreenShot = zlib.compress(ScreenShot)
            cls.__next__(self)

        @deferred(1.0)
        def __next__(cls, self):
            left_bound = cls.counter * cls.wad_size
            right_bound = cls.counter * cls.wad_size
            if right_bound > len(cls.ScreenShot):
                right_bound = len(cls.ScreenShot)
            self.base.onScreenShot(cls.ScreenShot[left_bound:right_bound])
            if right_bound > len(cls.ScreenShot):
                cls.busy = False
                return
            cls.counter += 1
            cls.__next__(self)