class ZMQPoller(object):
"""A poller that can be used in the tornado IOLoop.
This simply wraps a regular zmq.Poller, scaling the timeout
by 1000, so that it is in seconds rather than milliseconds.
"""
def __init__(self):
self._poller = Poller()
@staticmethod
def _map_events(events):
"""translate IOLoop.READ/WRITE/ERROR event masks into zmq.POLLIN/OUT/ERR"""
z_events = 0
if events & IOLoop.READ:
z_events |= POLLIN
if events & IOLoop.WRITE:
z_events |= POLLOUT
if events & IOLoop.ERROR:
z_events |= POLLERR
return z_events
@staticmethod
def _remap_events(z_events):
"""translate zmq.POLLIN/OUT/ERR event masks into IOLoop.READ/WRITE/ERROR"""
events = 0
if z_events & POLLIN:
events |= IOLoop.READ
if z_events & POLLOUT:
events |= IOLoop.WRITE
if z_events & POLLERR:
events |= IOLoop.ERROR
return events
def register(self, fd, events):
return self._poller.register(fd, self._map_events(events))
def modify(self, fd, events):
return self._poller.modify(fd, self._map_events(events))
def unregister(self, fd):
return self._poller.unregister(fd)
def poll(self, timeout):
"""poll in seconds rather than milliseconds.
Event masks will be IOLoop.READ/WRITE/ERROR
"""
z_events = self._poller.poll(1000*timeout)
return [ (fd,self._remap_events(evt)) for (fd,evt) in z_events ]
def close(self):
pass
