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| to reflect this by e.g. calling ``delattr(obj, attr)`` to remove the cached | to reflect this by e.g. calling ``delattr(obj, attr)`` to remove the cached | ||||
| method result as well as possibly calling ``del obj._filecache[attr]`` to | method result as well as possibly calling ``del obj._filecache[attr]`` to | ||||
| remove the ``filecacheentry``. | remove the ``filecacheentry``. | ||||
| """ | """ | ||||
| def __init__(self, *paths): | def __init__(self, *paths): | ||||
| self.paths = paths | self.paths = paths | ||||
| def tracked_paths(self, obj): | |||||
| return [self.join(obj, path) for path in self.paths] | |||||
| def join(self, obj, fname): | def join(self, obj, fname): | ||||
| """Used to compute the runtime path of a cached file. | """Used to compute the runtime path of a cached file. | ||||
| Users should subclass filecache and provide their own version of this | Users should subclass filecache and provide their own version of this | ||||
| function to call the appropriate join function on 'obj' (an instance | function to call the appropriate join function on 'obj' (an instance | ||||
| of the class that its member function was decorated). | of the class that its member function was decorated). | ||||
| """ | """ | ||||
| raise NotImplementedError | raise NotImplementedError | ||||
| assert self.sname not in obj.__dict__ | assert self.sname not in obj.__dict__ | ||||
| entry = obj._filecache.get(self.name) | entry = obj._filecache.get(self.name) | ||||
| if entry: | if entry: | ||||
| if entry.changed(): | if entry.changed(): | ||||
| entry.obj = self.func(obj) | entry.obj = self.func(obj) | ||||
| else: | else: | ||||
| paths = [self.join(obj, path) for path in self.paths] | paths = self.tracked_paths(obj) | ||||
| # We stat -before- creating the object so our cache doesn't lie if | # We stat -before- creating the object so our cache doesn't lie if | ||||
| # a writer modified between the time we read and stat | # a writer modified between the time we read and stat | ||||
| entry = filecacheentry(paths, True) | entry = filecacheentry(paths, True) | ||||
| entry.obj = self.func(obj) | entry.obj = self.func(obj) | ||||
| obj._filecache[self.name] = entry | obj._filecache[self.name] = entry | ||||
| obj.__dict__[self.sname] = entry.obj | obj.__dict__[self.sname] = entry.obj | ||||
| return entry.obj | return entry.obj | ||||
| # don't implement __set__(), which would make __dict__ lookup as slow as | # don't implement __set__(), which would make __dict__ lookup as slow as | ||||
| # function call. | # function call. | ||||
| def set(self, obj, value): | def set(self, obj, value): | ||||
| if self.name not in obj._filecache: | if self.name not in obj._filecache: | ||||
| # we add an entry for the missing value because X in __dict__ | # we add an entry for the missing value because X in __dict__ | ||||
| # implies X in _filecache | # implies X in _filecache | ||||
| paths = [self.join(obj, path) for path in self.paths] | paths = self.tracked_paths(obj) | ||||
| ce = filecacheentry(paths, False) | ce = filecacheentry(paths, False) | ||||
| obj._filecache[self.name] = ce | obj._filecache[self.name] = ce | ||||
| else: | else: | ||||
| ce = obj._filecache[self.name] | ce = obj._filecache[self.name] | ||||
| ce.obj = value # update cached copy | ce.obj = value # update cached copy | ||||
| obj.__dict__[self.sname] = value # update copy returned by obj.x | obj.__dict__[self.sname] = value # update copy returned by obj.x | ||||