55 lines
1.5 KiB
Python
55 lines
1.5 KiB
Python
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# Python imports
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from collections import defaultdict
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# Lib imports
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# Application imports
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from .singleton import Singleton
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class EventSystem(Singleton):
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""" Create event system. """
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def __init__(self):
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self.subscribers = defaultdict(list)
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def subscribe(self, event_type, fn):
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self.subscribers[event_type].append(fn)
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def unsubscribe(self, event_type, fn):
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self.subscribers[event_type].remove(fn)
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def unsubscribe_all(self, event_type):
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self.subscribers.pop(event_type, None)
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def emit(self, event_type, data = None):
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if event_type in self.subscribers:
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for fn in self.subscribers[event_type]:
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if data:
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if hasattr(data, '__iter__') and not type(data) is str:
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fn(*data)
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else:
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fn(data)
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else:
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fn()
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def emit_and_await(self, event_type, data = None):
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""" NOTE: Should be used when signal has only one listener and vis-a-vis """
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if event_type in self.subscribers:
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response = None
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for fn in self.subscribers[event_type]:
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if data:
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if hasattr(data, '__iter__') and not type(data) is str:
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response = fn(*data)
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else:
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response = fn(data)
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else:
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response = fn()
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if not response in (None, ''):
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break
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return response
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