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# -*- test-case-name: twisted.test.test_persisted -*- # Copyright (c) Twisted Matrix Laboratories. # See LICENSE for details. """ Utility classes for dealing with circular references. """ from twisted.python import log, reflect from twisted.python.compat import _constructMethod class NotKnown: def __init__(self): self.dependants = [] self.resolved = 0 def addDependant(self, mutableObject, key): assert not self.resolved self.dependants.append((mutableObject, key)) resolvedObject = None def resolveDependants(self, newObject): self.resolved = 1 self.resolvedObject = newObject for mut, key in self.dependants: mut[key] = newObject def __hash__(self): assert 0, "I am not to be used as a dictionary key." class _Container(NotKnown): """ Helper class to resolve circular references on container objects. """ def __init__(self, l, containerType): """ @param l: The list of object which may contain some not yet referenced objects. @param containerType: A type of container objects (e.g., C{tuple} or C{set}). """ NotKnown.__init__(self) self.containerType = containerType self.l = l self.locs = list(range(len(l))) for idx in range(len(l)): if not isinstance(l[idx], NotKnown): self.locs.remove(idx) else: l[idx].addDependant(self, idx) if not self.locs: self.resolveDependants(self.containerType(self.l)) def __setitem__(self, n, obj): """ Change the value of one contained objects, and resolve references if all objects have been referenced. """ self.l[n] = obj if not isinstance(obj, NotKnown): self.locs.remove(n) if not self.locs: self.resolveDependants(self.containerType(self.l)) class _Tuple(_Container): """ Manage tuple containing circular references. Deprecated: use C{_Container} instead. """ def __init__(self, l): """ @param l: The list of object which may contain some not yet referenced objects. """ _Container.__init__(self, l, tuple) class _InstanceMethod(NotKnown): def __init__(self, im_name, im_self, im_class): NotKnown.__init__(self) self.my_class = im_class self.name = im_name # im_self _must_ be a NotKnown im_self.addDependant(self, 0) def __call__(self, *args, **kw): import traceback log.msg(f"instance method {reflect.qual(self.my_class)}.{self.name}") log.msg(f"being called with {args!r} {kw!r}") traceback.print_stack(file=log.logfile) assert 0 def __setitem__(self, n, obj): assert n == 0, "only zero index allowed" if not isinstance(obj, NotKnown): method = _constructMethod(self.my_class, self.name, obj) self.resolveDependants(method) class _DictKeyAndValue: def __init__(self, dict): self.dict = dict def __setitem__(self, n, obj): if n not in (1, 0): raise RuntimeError("DictKeyAndValue should only ever be called with 0 or 1") if n: # value self.value = obj else: self.key = obj if hasattr(self, "key") and hasattr(self, "value"): self.dict[self.key] = self.value class _Dereference(NotKnown): def __init__(self, id): NotKnown.__init__(self) self.id = id from twisted.internet.defer import Deferred class _Defer(Deferred[object], NotKnown): def __init__(self): Deferred.__init__(self) NotKnown.__init__(self) self.pause() wasset = 0 def __setitem__(self, n, obj): if self.wasset: raise RuntimeError( "setitem should only be called once, setting {!r} to {!r}".format( n, obj ) ) else: self.wasset = 1 self.callback(obj) def addDependant(self, dep, key): # by the time I'm adding a dependant, I'm *not* adding any more # callbacks NotKnown.addDependant(self, dep, key) self.unpause() resovd = self.result self.resolveDependants(resovd)