def call_handlers(self, since_last_heartbeat):
        raise NotImplementedError('call_handlers must be defined in a subclass.')


#-----------------------------------------------------------------------------
# Main kernel manager class
#-----------------------------------------------------------------------------
Test that removing a user to a group fires the correct django signal
dataset/ETHPy150Open ipython/ipython-py3k/IPython/zmq/kernelmanager.py/HBSocketChannel.call_handlers--crossover with--dataset/ETHPy150Open ofa/connect/open_connect/groups/tests/test_tasks.py/TestRemoveUserFromGroup.test_fires_removed_from_group_signal