from direct.directnotify.DirectNotifyGlobal import directNotify
from direct.showbase.DirectObject import DirectObject
from direct.showbase.EventGroup import EventGroup
[docs]class InterestWatcher(DirectObject):
"""Object that observes all interests adds/removes over a period of time,
and sends out an event when all of those interests have closed"""
notify = directNotify.newCategory('InterestWatcher')
[docs] def __init__(self, interestMgr, name, doneEvent=None,
recurse=True, start=True, mustCollect=False, doCollectionMgr=None):
DirectObject.__init__(self)
self._interestMgr = interestMgr
if doCollectionMgr is None:
doCollectionMgr = interestMgr
self._doCollectionMgr = doCollectionMgr
self._eGroup = EventGroup(name, doneEvent=doneEvent)
self._doneEvent = self._eGroup.getDoneEvent()
self._gotEvent = False
self._recurse = recurse
if self._recurse:
# this will hold a dict of parentId to set(zoneIds) that are closing
self.closingParent2zones = {}
if start:
self.startCollect(mustCollect)
[docs] def startCollect(self, mustCollect=False):
self._mustCollect = mustCollect
self.accept(self._interestMgr._getAddInterestEvent(), self._handleInterestOpenEvent)
self.accept(self._interestMgr._getRemoveInterestEvent(), self._handleInterestCloseEvent)
[docs] def stopCollect(self):
self.ignore(self._interestMgr._getAddInterestEvent())
self.ignore(self._interestMgr._getRemoveInterestEvent())
mustCollect = self._mustCollect
del self._mustCollect
if not self._gotEvent:
if mustCollect:
logFunc = self.notify.error
else:
logFunc = self.notify.warning
logFunc('%s: empty interest-complete set' % self.getName())
self.destroy()
messenger.send(self.getDoneEvent())
else:
self.accept(self.getDoneEvent(), self.destroy)
[docs] def destroy(self):
if hasattr(self, '_eGroup'):
self._eGroup.destroy()
del self._eGroup
del self._gotEvent
del self._interestMgr
self.ignoreAll()
[docs] def getName(self):
return self._eGroup.getName()
[docs] def getDoneEvent(self):
return self._doneEvent
def _handleInterestOpenEvent(self, event):
self._gotEvent = True
self._eGroup.addEvent(event)
def _handleInterestCloseEvent(self, event, parentId, zoneIdList):
self._gotEvent = True
self._eGroup.addEvent(event)
"""
if self._recurse:
# this interest is in the process of closing. If an interest
# underneath any objects in that interest close, we need to know
# about it.
self.closingParent2zones.setdefault(parentId, set())
self.closingParent2zones[parentId].union(set(zoneIdList))
"""
