def __init__(self):
"""
Constructor.
Create ZeroMQ context.
"""
self.connections = set()
self.context = Context(self.ioThreads)
def __init__(self, io_threads=1):
"""
@param io_threads; Passed through to zmq.core.context.Context
"""
global _context
assert _context is None, 'Only one ZmqContext instance is permitted'
self._sockets = set()
self._zctx = Context(io_threads)
_context = self
reactor.addSystemEventTrigger('during', 'shutdown', _cleanup)
