Mercurial > fife-parpg

annotate clients/editor/scripts/events/saferef.py @ 341:3a268cf93752

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author cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
date Tue, 25 Aug 2009 00:09:05 +0000
parents 51cc05d862f2
children
rev   line source
255
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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1 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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2 "Safe weakrefs", originally from pyDispatcher. Copied from django v1.1 beta 1
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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3
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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4 Provides a way to safely weakref any function, including bound methods (which
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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5 aren't handled by the core weakref module).
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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6 """
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7
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
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8 import weakref, traceback
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9
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10 def safeRef(target, onDelete = None):
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11 """Return a *safe* weak reference to a callable target
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12
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13 target -- the object to be weakly referenced, if it's a
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14 bound method reference, will create a BoundMethodWeakref,
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15 otherwise creates a simple weakref.
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16 onDelete -- if provided, will have a hard reference stored
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17 to the callable to be called after the safe reference
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18 goes out of scope with the reference object, (either a
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19 weakref or a BoundMethodWeakref) as argument.
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20 """
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21 if hasattr(target, 'im_self'):
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22 if target.im_self is not None:
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23 # Turn a bound method into a BoundMethodWeakref instance.
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24 # Keep track of these instances for lookup by disconnect().
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25 assert hasattr(target, 'im_func'), """safeRef target %r has im_self, but no im_func, don't know how to create reference"""%( target,)
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26 reference = get_bound_method_weakref(
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27 target=target,
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28 onDelete=onDelete
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29 )
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30 return reference
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31 if callable(onDelete):
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32 return weakref.ref(target, onDelete)
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33 else:
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34 return weakref.ref( target )
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35
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36 class BoundMethodWeakref(object):
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37 """'Safe' and reusable weak references to instance methods
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38
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39 BoundMethodWeakref objects provide a mechanism for
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40 referencing a bound method without requiring that the
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41 method object itself (which is normally a transient
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42 object) is kept alive. Instead, the BoundMethodWeakref
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43 object keeps weak references to both the object and the
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44 function which together define the instance method.
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45
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46 Attributes:
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47 key -- the identity key for the reference, calculated
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48 by the class's calculateKey method applied to the
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49 target instance method
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50 deletionMethods -- sequence of callable objects taking
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51 single argument, a reference to this object which
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52 will be called when *either* the target object or
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53 target function is garbage collected (i.e. when
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54 this object becomes invalid). These are specified
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55 as the onDelete parameters of safeRef calls.
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56 weakSelf -- weak reference to the target object
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57 weakFunc -- weak reference to the target function
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58
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59 Class Attributes:
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60 _allInstances -- class attribute pointing to all live
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61 BoundMethodWeakref objects indexed by the class's
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62 calculateKey(target) method applied to the target
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63 objects. This weak value dictionary is used to
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64 short-circuit creation so that multiple references
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65 to the same (object, function) pair produce the
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66 same BoundMethodWeakref instance.
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67
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68 """
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69
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70 _allInstances = weakref.WeakValueDictionary()
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71
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72 def __new__( cls, target, onDelete=None, *arguments,**named ):
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73 """Create new instance or return current instance
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74
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75 Basically this method of construction allows us to
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76 short-circuit creation of references to already-
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77 referenced instance methods. The key corresponding
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78 to the target is calculated, and if there is already
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79 an existing reference, that is returned, with its
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80 deletionMethods attribute updated. Otherwise the
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81 new instance is created and registered in the table
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82 of already-referenced methods.
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83 """
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84 key = cls.calculateKey(target)
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85 current =cls._allInstances.get(key)
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86 if current is not None:
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87 current.deletionMethods.append( onDelete)
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88 return current
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89 else:
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90 base = super( BoundMethodWeakref, cls).__new__( cls )
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91 cls._allInstances[key] = base
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92 base.__init__( target, onDelete, *arguments,**named)
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93 return base
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94
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95 def __init__(self, target, onDelete=None):
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96 """Return a weak-reference-like instance for a bound method
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97
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98 target -- the instance-method target for the weak
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99 reference, must have im_self and im_func attributes
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100 and be reconstructable via:
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101 target.im_func.__get__( target.im_self )
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102 which is true of built-in instance methods.
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103 onDelete -- optional callback which will be called
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104 when this weak reference ceases to be valid
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105 (i.e. either the object or the function is garbage
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106 collected). Should take a single argument,
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107 which will be passed a pointer to this object.
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108 """
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109 def remove(weak, self=self):
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110 """Set self.isDead to true when method or instance is destroyed"""
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111 methods = self.deletionMethods[:]
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112 del self.deletionMethods[:]
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113 try:
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114 del self.__class__._allInstances[ self.key ]
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115 except KeyError:
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116 pass
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
117 for function in methods:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
118 try:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
119 if callable( function ):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
120 function( self )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
121 except Exception, e:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
122 try:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
123 traceback.print_exc()
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
124 except AttributeError, err:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
125 print '''Exception during saferef %s cleanup function %s: %s'''%(
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
126 self, function, e
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
127 )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
128 self.deletionMethods = [onDelete]
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
129 self.key = self.calculateKey( target )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
130 self.weakSelf = weakref.ref(target.im_self, remove)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
131 self.weakFunc = weakref.ref(target.im_func, remove)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
132 self.selfName = str(target.im_self)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
133 self.funcName = str(target.im_func.__name__)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
134
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
135 def calculateKey( cls, target ):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
136 """Calculate the reference key for this reference
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
137
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
138 Currently this is a two-tuple of the id()'s of the
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
139 target object and the target function respectively.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
140 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
141 return (id(target.im_self),id(target.im_func))
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
142 calculateKey = classmethod( calculateKey )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
143
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
144 def __str__(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
145 """Give a friendly representation of the object"""
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
146 return """%s( %s.%s )"""%(
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
147 self.__class__.__name__,
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
148 self.selfName,
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
149 self.funcName,
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
150 )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
151
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
152 __repr__ = __str__
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
153
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
154 def __nonzero__( self ):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
155 """Whether we are still a valid reference"""
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
156 return self() is not None
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
157
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
158 def __cmp__( self, other ):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
159 """Compare with another reference"""
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
160 if not isinstance (other,self.__class__):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
161 return cmp( self.__class__, type(other) )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
162 return cmp( self.key, other.key)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
163
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
164 def __call__(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
165 """Return a strong reference to the bound method
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
166
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
167 If the target cannot be retrieved, then will
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
168 return None, otherwise returns a bound instance
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
169 method for our object and function.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
170
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
171 Note:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
172 You may call this method any number of times,
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
173 as it does not invalidate the reference.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
174 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
175 target = self.weakSelf()
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
176 if target is not None:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
177 function = self.weakFunc()
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
178 if function is not None:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
179 return function.__get__(target)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
180 return None
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
181
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
182 class BoundNonDescriptorMethodWeakref(BoundMethodWeakref):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
183 """A specialized BoundMethodWeakref, for platforms where instance methods
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
184 are not descriptors.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
185
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
186 It assumes that the function name and the target attribute name are the
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
187 same, instead of assuming that the function is a descriptor. This approach
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
188 is equally fast, but not 100% reliable because functions can be stored on an
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
189 attribute named differenty than the function's name such as in:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
190
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
191 class A: pass
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
192 def foo(self): return "foo"
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
193 A.bar = foo
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
194
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
195 But this shouldn't be a common use case. So, on platforms where methods
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
196 aren't descriptors (such as Jython) this implementation has the advantage
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
197 of working in the most cases.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
198 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
199 def __init__(self, target, onDelete=None):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
200 """Return a weak-reference-like instance for a bound method
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
201
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
202 target -- the instance-method target for the weak
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
203 reference, must have im_self and im_func attributes
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
204 and be reconstructable via:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
205 target.im_func.__get__( target.im_self )
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
206 which is true of built-in instance methods.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
207 onDelete -- optional callback which will be called
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
208 when this weak reference ceases to be valid
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
209 (i.e. either the object or the function is garbage
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
210 collected). Should take a single argument,
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
211 which will be passed a pointer to this object.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
212 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
213 assert getattr(target.im_self, target.__name__) == target, \
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
214 ("method %s isn't available as the attribute %s of %s" %
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
215 (target, target.__name__, target.im_self))
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
216 super(BoundNonDescriptorMethodWeakref, self).__init__(target, onDelete)
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
217
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
218 def __call__(self):
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
219 """Return a strong reference to the bound method
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
220
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
221 If the target cannot be retrieved, then will
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
222 return None, otherwise returns a bound instance
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
223 method for our object and function.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
224
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
225 Note:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
226 You may call this method any number of times,
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
227 as it does not invalidate the reference.
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
228 """
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
229 target = self.weakSelf()
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
230 if target is not None:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
231 function = self.weakFunc()
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
232 if function is not None:
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
233 # Using curry() would be another option, but it erases the
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
234 # "signature" of the function. That is, after a function is
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cheesesucker@33b003aa-7bff-0310-803a-e67f0ece8222
parents:
diff changeset
235 # curried, the inspect module can't be used to determine how
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236 # many arguments the function expects, nor what keyword
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237 # arguments it supports, and pydispatcher needs this
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238 # information.
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239 return getattr(target, function.__name__)
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240 return None
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241
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242 def get_bound_method_weakref(target, onDelete):
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243 """Instantiates the appropiate BoundMethodWeakRef, depending on the details of
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244 the underlying class method implementation"""
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245 if hasattr(target, '__get__'):
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246 # target method is a descriptor, so the default implementation works:
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247 return BoundMethodWeakref(target=target, onDelete=onDelete)
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248 else:
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249 # no luck, use the alternative implementation:
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250 return BoundNonDescriptorMethodWeakref(target=target, onDelete=onDelete)