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_saferef.cpython-310.pyc
o Q$ @ s d Z ddlZddlZddlZddlZze W n ey# dd ZY nw ejdk r4edZ edZ n edZ ed Z dd d Z G d d d e Z dS )z-Refactored 'safe reference from dispatcher.py Nc C s t | dS )N__call__)hasattr)object r 2/usr/lib/python3/dist-packages/blinker/_saferef.pycallable. s r ) im_selfim_func__self____func__c C s~ zt | }W n ty t|rt| | Y S t| Y S w |dur=t| ds5t| ds5J d| t| |d}|S dS )a Return a *safe* weak reference to a callable target. - ``target``: The object to be weakly referenced, if it's a bound method reference, will create a BoundMethodWeakref, otherwise creates a simple weakref. - ``on_delete``: If provided, will have a hard reference stored to the callable to be called after the safe reference goes out of scope with the reference object, (either a weakref or a BoundMethodWeakref) as argument. Nr r zRsafe_ref target %r has im_self, but no im_func, don't know how to create reference)target on_delete)get_selfAttributeErrorr weakrefrefr BoundMethodWeakref)r r r Z referencer r r safe_ref: s r c sh e Zd ZdZe Zd fdd ZdddZdd Z e e Z d d Z e Z d d Z d d Zdd Z ZS )r a 'Safe' and reusable weak references to instance methods. BoundMethodWeakref objects provide a mechanism for referencing a bound method without requiring that the method object itself (which is normally a transient object) is kept alive. Instead, the BoundMethodWeakref object keeps weak references to both the object and the function which together define the instance method. Attributes: - ``key``: The identity key for the reference, calculated by the class's calculate_key method applied to the target instance method. - ``deletion_methods``: Sequence of callable objects taking single argument, a reference to this object which will be called when *either* the target object or target function is garbage collected (i.e. when this object becomes invalid). These are specified as the on_delete parameters of safe_ref calls. - ``weak_self``: Weak reference to the target object. - ``weak_func``: Weak reference to the target function. Class Attributes: - ``_all_instances``: Class attribute pointing to all live BoundMethodWeakref objects indexed by the class's calculate_key(target) method applied to the target objects. This weak value dictionary is used to short-circuit creation so that multiple references to the same (object, function) pair produce the same BoundMethodWeakref instance. Nc sf | |}| j|}|dur|j| |S tt| | }|| j|< |j||g|R i | |S )a Create new instance or return current instance. Basically this method of construction allows us to short-circuit creation of references to already- referenced instance methods. The key corresponding to the target is calculated, and if there is already an existing reference, that is returned, with its deletion_methods attribute updated. Otherwise the new instance is created and registered in the table of already-referenced methods. N) calculate_key_all_instancesgetdeletion_methodsappendsuperr __new____init__)clsr r Z argumentsZnamedkeyZcurrentbase __class__r r r | s zBoundMethodWeakref.__new__c C sf | fdd}|g| _ | || _t|}t|}t||| _t||| _t || _ t |j | _ dS )a Return a weak-reference-like instance for a bound method. - ``target``: The instance-method target for the weak reference, must have im_self and im_func attributes and be reconstructable via the following, which is true of built-in instance methods:: target.im_func.__get__( target.im_self ) - ``on_delete``: Optional callback which will be called when this weak reference ceases to be valid (i.e. either the object or the function is garbage collected). Should take a single argument, which will be passed a pointer to this object. c S s |j dd }|j dd= z|jj|j= W n ty Y nw |D ]4}z t|r,|| W q! tyU zt W n t yR t d }t d|||f Y nw Y q!w dS )z=Set self.isDead to True when method or instance is destroyed.N z3Exception during saferef %s cleanup function %s: %s) r r! r r KeyErrorr Exception traceback print_excr sysexc_infoprint)Zweakselfmethodsfunctioner r r remove s0 z+BoundMethodWeakref.__init__.<locals>.removeN) r r r r get_funcr r weak_self weak_funcstr self_name__name__ func_name)r* r r r. r r r r r r s zBoundMethodWeakref.__init__c C s t t|t t|fS )zCalculate the reference key for this reference. Currently this is a two-tuple of the id()'s of the target object and the target function respectively. )idr r/ )r r r r r r s z BoundMethodWeakref.calculate_keyc C s d| j j| j| jf S )z-Give a friendly representation of the object.z %s(%s.%s))r! r4 r3 r5 r* r r r __str__ s zBoundMethodWeakref.__str__c C s | duS )z'Whether we are still a valid reference.Nr r7 r r r __nonzero__ s z BoundMethodWeakref.__nonzero__c C s* t || jst| jt|S t| j|jS )z Compare with another reference.) isinstancer! Zcmptyper )r* otherr r r __cmp__ s zBoundMethodWeakref.__cmp__c C s. | }|dur| }|dur||S dS )a? Return a strong reference to the bound method. If the target cannot be retrieved, then will return None, otherwise returns a bound instance method for our object and function. Note: You may call this method any number of times, as it does not invalidate the reference. N)r0 r1 __get__)r* r r, r r r r s zBoundMethodWeakref.__call__N)r4 __module__ __qualname____doc__r ZWeakValueDictionaryr r r r classmethodr8 __repr__r9 r= r __classcell__r r r r r X s ! ,r r? )rB operatorr' r% r r NameError version_info attrgetterr r/ r r r r r r r <module> s" "