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27 lines
946 B
Python
27 lines
946 B
Python
from transitions import Machine
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class FSMBase:
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states, transitions = [], []
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def __init__(self, initial: str = None):
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self.message_handlers = []
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self.machine = Machine(model=self,
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states=self.states,
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transitions=self.transitions,
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initial=initial or self.states[0],
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send_event=True,
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ignore_invalid_triggers=True,
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after_state_change='forward_message')
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def forward_message(self, event_data):
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message = event_data.kwargs.get('message')
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for msghandler in self.message_handlers:
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msghandler(message)
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def subscribe_message_handler(self, msghandler):
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self.message_handlers.append(msghandler)
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def unsubscribe_message_handler(self, msghandler):
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self.message_handlers.remove(msghandler)
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