/usr/share/pyshared/glitch/multicontext.py is in python-glitch 0.6-3.
This file is owned by root:root, with mode 0o644.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 | "Base class for objects that have per-context state."
class CacheEntry(object):
def __init__(self, version, data):
self.version = version
self.data = data
class MultiContext(object):
"Base class for objects that have per-context state."
def __init__(self):
self.version = 0
def _context_create(self, ctx):
"Create per-context state."
raise NotImplementedError()
def _context_update(self, ctx, old_data):
"Update per-context state."
raise NotImplementedError()
def _context_delete(self, ctx, obj):
"Delete per-context state."
raise NotImplementedError()
def context_delete(self, ctx):
"Remove this object from the given context."
cache = ctx.setdefault(self._context_key, {})
entry = cache.get(self)
if entry is not None:
self._context_delete(ctx, entry.data)
del cache[self]
def context_get(self, ctx):
"""Get the instantiation of this object in the given context.
This instantiates the object in the context if necessary.
"""
cache = ctx.setdefault(self._context_key, {})
entry = cache.get(self)
if entry is not None:
if entry.version < self.version:
data = self._context_update(ctx, entry.data)
entry.version = self.version
entry.data = data
else:
data = self._context_create(ctx)
entry = cache[self] = CacheEntry(self.version, data)
return entry.data
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