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55 lines
1.4 KiB
Python
55 lines
1.4 KiB
Python
import logging
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class Subject:
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"""Adds support for observers"""
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logger = logging.getLogger("subject.subject")
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def __init__(self):
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"""list of current observers"""
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self._observers = list()
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@property
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def observers(self) -> list:
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"""returns the current observers"""
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return self._observers
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def notify(self, modifier=None):
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"""run callbacks on update"""
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[o.on_update(modifier) for o in self._observers]
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def add(self, observer):
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"""adds an observer to _observers"""
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if observer not in self._observers:
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self._observers.append(observer)
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self.logger.info(f"{type(observer).__name__} added to event observers")
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else:
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self.logger.error(
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f"Failed to add {type(observer).__name__} to event observers"
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)
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register = add
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def remove(self, observer):
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"""removes an observer from _observers"""
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try:
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self._observers.remove(observer)
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self.logger.info(f"{type(observer).__name__} removed from event observers")
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except ValueError:
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self.logger.error(
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f"Failed to remove {type(observer).__name__} from event observers"
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)
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deregister = remove
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def clear(self):
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"""clears the _observers list"""
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self._observers.clear()
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