class Board(object):
"""
Base class for Board hardware implementations
"""
__metaclass__ = ABCMeta
def __init__(self):
self.emitter = EventEmitter()
self.hardware_event_job = SCHEDULER.add_job(
self.update_hardware_state,
"interval",
seconds=ms(100),
coalesce=True,
max_instances=1
)
def trigger_hardware_event(self, event, *args, **kwargs):
"""
Signal hardware event.
"""
self.emitter.emit(event, *args, **kwargs)
def add_event_handler(self, event, handler, once=False):
"""
Add hardware event handler.
"""
if once:
self.emitter.once(event, handler)
else:
self.emitter.on(event, handler)
def remove_event_handler(self, event, handler):
"""
Remove hardware event handler.
"""
self.emitter.remove(event, handler)
@abstractmethod
def update_hardware_state(self):
"""
Abstract method for updating hardware state.
"""
pass
