31 lines
1011 B
Python
31 lines
1011 B
Python
from media.monitor.log import Loggable
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from media.monitor.events import DeleteFile
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class EventContractor(Loggable):
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def __init__(self):
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self.store = {}
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def event_registered(self, evt):
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return evt.path in self.store
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def get_old_event(self, evt):
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return evt.store[ evt.path ]
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def register(self, evt):
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if self.event_registered(evt):
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old_e = self.get_old_event(evt)
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# If two events are of the same type we can safely discard the old
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# one
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if evt.__class__ == old_e.__class__:
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old_e.morph_into(evt)
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# delete overrides any other event
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elif isinstance(evt, DeleteFile):
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old_e.morph_into(evt)
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else:
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evt.add_safe_pack_hook( lambda : self.__unregister(evt) )
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self.store[ evt.path ] = evt
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# events are unregistered automatically no need to screw around with them
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def __unregister(self, evt):
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del self.store[evt.path]
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