import time
from msg.listener import MsgListener
from msg.talker   import MsgTalker
from msg.container import MsgContainer


class ReplayPacer(MsgListener, MsgTalker):
    """Sits between a packetizer and its listeners; sleeps after each
    complete frame so file replay runs at a controlled rate."""

    def __init__(self, delay: float = 1.0):
        MsgListener.__init__(self)
        MsgTalker.__init__(self)
        self.delay = delay

    def is_msg(self, msg: MsgContainer) -> bool:
        return True

    def on_recv(self, msg: MsgContainer):
        if self.delay > 0:
            time.sleep(self.delay)
        self.call_listener(msg)