138 lines
3.6 KiB
Python
138 lines
3.6 KiB
Python
import logging
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logger = logging.getLogger(__name__)
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class Subscription(object):
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def __init__(self, subscriptee, subscriber):
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self.subscriptee = subscriptee
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self.subscriber = subscriber
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def call(self, *args, **kwargs):
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self.subscriber(*args, **kwargs)
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def cancel(self):
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self.subscriptee.unwire(self)
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class Property(object):
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def __init__(self, value=None):
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self.value = value
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self.subscribers = []
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def getValue(self):
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return self.value
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def setValue(self, value):
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if self.value == value:
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return self
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self.value = value
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for c in self.subscribers:
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try:
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c.call(self.value)
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except Exception as e:
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logger.exception(e)
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return self
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def wire(self, callback):
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sub = Subscription(self, callback)
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self.subscribers.append(sub)
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if not self.value is None:
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sub.call(self.value)
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return sub
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def unwire(self, sub):
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try:
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self.subscribers.remove(sub)
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except ValueError:
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# happens when already removed before
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pass
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return self
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class PropertyManager(object):
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sharedInstance = None
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@staticmethod
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def getSharedInstance():
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if PropertyManager.sharedInstance is None:
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PropertyManager.sharedInstance = PropertyManager()
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return PropertyManager.sharedInstance
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def collect(self, *props):
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return PropertyManager(
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{name: self.getProperty(name) if self.hasProperty(name) else Property() for name in props}
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)
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def __init__(self, properties=None):
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self.properties = {}
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self.subscribers = []
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if properties is not None:
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for (name, prop) in properties.items():
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self.add(name, prop)
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def add(self, name, prop):
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self.properties[name] = prop
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def fireCallbacks(value):
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for c in self.subscribers:
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try:
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c.call(name, value)
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except Exception as e:
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logger.exception(e)
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prop.wire(fireCallbacks)
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return self
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def __contains__(self, name):
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return self.hasProperty(name)
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def __getitem__(self, name):
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return self.getPropertyValue(name)
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def __setitem__(self, name, value):
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if not self.hasProperty(name):
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self.add(name, Property())
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self.getProperty(name).setValue(value)
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def __dict__(self):
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return {k: v.getValue() for k, v in self.properties.items()}
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def hasProperty(self, name):
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return name in self.properties
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def getProperty(self, name):
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if not self.hasProperty(name):
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self.add(name, Property())
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return self.properties[name]
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def getPropertyValue(self, name):
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return self.getProperty(name).getValue()
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def wire(self, callback):
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sub = Subscription(self, callback)
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self.subscribers.append(sub)
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return sub
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def unwire(self, sub):
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try:
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self.subscribers.remove(sub)
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except ValueError:
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# happens when already removed before
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pass
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return self
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def defaults(self, other_pm):
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for (key, p) in self.properties.items():
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if p.getValue() is None:
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p.setValue(other_pm[key])
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return self
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def loadConfig(self, filename):
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cfg = __import__(filename)
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for name, value in cfg.__dict__.items():
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if name.startswith("__"):
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continue
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self[name] = value
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return self
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