0x1998 - MANAGER
Düzenlenen Dosya: attr.cpython-37.pyc
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The attribute mechanics here spend effort trying to ensure listener functions are available with a minimum of function call overhead, that unnecessary objects aren't created (i.e. many empty per-instance listener collections), as well as that everything is garbage collectable when owning references are lost. Other features such as "propagation" of listener functions across many ``_Dispatch`` instances, "joining" of multiple ``_Dispatch`` instances, as well as support for subclass propagation (e.g. events assigned to ``Pool`` vs. ``QueuePool``) are all implemented here. � )�absolute_import)�with_statementN)�chain� )�legacy)�registry� )�exc)�util)� threadingc @ s e Zd ZdZdd� ZdS )� RefCollection)�refc C s t �| tj�S )N)�weakrefr r Z_collection_gced)�self� r �H/opt/alt/python37/lib64/python3.7/site-packages/sqlalchemy/event/attr.py�_memoized_attr_ref1 s z RefCollection._memoized_attr_refN)�__name__� __module__� __qualname__� __slots__r r r r r r . s r c @ s4 e Zd Zdd� Zdd� Zdd� Zdd� Zd d � Zd S ) �_empty_collectionc C s d S )Nr )r �elementr r r �append6 s z_empty_collection.appendc C s d S )Nr )r �otherr r r �extend9 s z_empty_collection.extendc C s d S )Nr )r r r r r �remove< s z_empty_collection.removec C s t g �S )N)�iter)r r r r �__iter__? s z_empty_collection.__iter__c C s d S )Nr )r r r r �clearB s z_empty_collection.clearN)r r r r r r r r r r r r r 5 s r c @ sd e Zd ZdZdZdd� Zdd� Zdd� Zd d � Zd d � Z d d� Z dd� Z dd� Z dd� Z dd� ZdS )�_ClsLevelDispatchz2Class-level events on :class:`._Dispatch` classes.)�name� arg_names�has_kw�legacy_signatures� _clslevel� __weakref__c C sn |j | _t�|�}|jdd � | _t|j�| _t t t t |dg �dd� d���| _ t�| ||�|_t�� | _d S )Nr Z_legacy_signaturesc S s | d S )Nr r )�sr r r �<lambda>Z � z,_ClsLevelDispatch.__init__.<locals>.<lambda>)�key)r r! r Zinspect_getfullargspec�argsr" �bool�varkwr# �list�reversed�sorted�getattrr$ r Z_augment_fn_docs�__doc__r �WeakKeyDictionaryr% )r Zparent_dispatch_cls�fn�argspecr r r �__init__R s z_ClsLevelDispatch.__init__c C sN |r| � |�}| jrJytj|dd�}W n tk r: Y nX t�| ||�}|S )NT)Zno_self)�_wrap_fn_for_kwr$ r Zget_callable_argspec� TypeErrorr Z_wrap_fn_for_legacy)r r4 �namedr5 r r r �_adjust_fn_specb s z!_ClsLevelDispatch._adjust_fn_specc s � �fdd�}|S )Nc s$ t t�j| ��}|�|� � f |�S )N)�dict�zipr" �update)r+ �kwZargdict)r4 r r r �wrap_kwo s z2_ClsLevelDispatch._wrap_fn_for_kw.<locals>.wrap_kwr )r r4 r? r )r4 r r r7 n s z!_ClsLevelDispatch._wrap_fn_for_kwc C s� |j }t|t�std��t|dd�s2t�d| ��|g}xd|r�|�d�}|�|� � � ||k rt|| j krt| � |� q:|| j kr�| � |� | j | � |j� q:W t�|| � d S )Nz*Class-level Event targets must be classes.�_sa_propagate_class_eventsTz.Can't assign an event directly to the %s classr )�dispatch_target� isinstance�type�AssertionErrorr1 r �InvalidRequestError�popr �__subclasses__r% �update_subclass�_assign_cls_collection� appendleft� _listen_fnr �_stored_in_collection)r � event_key� propagate�target�stack�clsr r r �insertv s" z_ClsLevelDispatch.insertc C s� |j }t|t�std��t|dd�s2t�d| ��|g}xd|r�|�d�}|�|� � � ||k rt|| j krt| � |� q:|| j kr�| � |� | j | � |j� q:W t�|| � d S )Nz*Class-level Event targets must be classes.r@ Tz.Can't assign an event directly to the %s classr )rA rB rC rD r1 r rE rF r rG r% rH rI r rK r rL )r rM rN rO rP rQ r r r r � s" z_ClsLevelDispatch.appendc C s, t |dd�r t�� | j|< n t� | j|< d S )Nr@ T)r1 � collections�dequer% r )r rO r r r rI � s z(_ClsLevelDispatch._assign_cls_collectionc sb || j kr| �|� | j | � x>|jdd � D ],}|| j kr.� �� fdd�| j | D �� q.W d S )Nr c s g | ]}|� kr|�qS r r )�.0r4 )�clslevelr r � <listcomp>� s z5_ClsLevelDispatch.update_subclass.<locals>.<listcomp>)r% rI �__mro__r )r rO rQ r )rV r rH � s z!_ClsLevelDispatch.update_subclassc C sZ |j }|g}x<|rH|�d�}|�|�� � || jkr| j| �|j� qW t�|| � d S )Nr ) rA rF r rG r% r rK r �_removed_from_collection)r rM rO rP rQ r r r r � s z_ClsLevelDispatch.removec C s< t � }x$| j�� D ]}|�|� |�� qW t�| |� dS )z Clear all class level listenersN)�setr% �valuesr= r r �_clear)r Zto_clearZ dispatcherr r r r � s z_ClsLevelDispatch.clearc C s | S )z�Return an event collection which can be modified. For _ClsLevelDispatch at the class level of a dispatcher, this returns self. r )r �objr r r � for_modify� s z _ClsLevelDispatch.for_modifyN)r r r r2 r r6 r: r7 rR r rI rH r r r^ r r r r r F s r c @ s e Zd ZdZdd� ZdS )�_InstanceLevelDispatchr c C s | j �||�S )N)�parentr: )r r4 r9 r r r r: � s z&_InstanceLevelDispatch._adjust_fn_specN)r r r r r: r r r r r_ � s r_ c @ sn e Zd ZdZe� ZdZdZdd� Zdd� Z dd � Z e Z Z Z ZZd d � Zd d � Zdd� Zdd� ZeZdS )�_EmptyListenerz�Serves as a proxy interface to the events served by a _ClsLevelDispatch, when there are no instance-level events present. Is replaced by _ListenerCollection when instance-level events are added. r )r` �parent_listenersr! c C s2 ||j kr|�|� || _|j | | _|j| _d S )N)r% rH r` rb r! )r r` � target_clsr r r r6 � s z_EmptyListener.__init__c C sH t | j|j�}t|| j�| kr.t|| j|� ntt|| j�t�sDt�|S )z�Return an event collection which can be modified. For _EmptyListener at the instance level of a dispatcher, this generates a new _ListenerCollection, applies it to the instance, and returns it. ) �_ListenerCollectionr` Z _instance_clsr1 r! �setattrrB �_JoinedListenerrD )r r] �resultr r r r^ � s z_EmptyListener.for_modifyc O s t d��d S )Nzneed to call for_modify())�NotImplementedError)r r+ r> r r r � _needs_modify� s z _EmptyListener._needs_modifyc O s x| j D ]}|||� qW dS )zExecute this event.N)rb )r r+ r> r4 r r r �__call__� s z_EmptyListener.__call__c C s t | j�S )N)�lenrb )r r r r �__len__ s z_EmptyListener.__len__c C s t | j�S )N)r rb )r r r r r s z_EmptyListener.__iter__c C s t | j�S )N)r, rb )r r r r �__bool__ s z_EmptyListener.__bool__N)r r r r2 � frozensetrN � listenersr r6 r^ ri � exec_oncerR r r r rj rl r rm � __nonzero__r r r r ra � s ra c @ sD e Zd ZdZdd� Zdd� Zdd� Zdd � Zd d � Zd d � Z e Z dS )�_CompoundListener)�_exec_once_mutex� _exec_oncec C s t �� S )N)r �Lock)r r r r � _memoized_attr__exec_once_mutex s z1_CompoundListener._memoized_attr__exec_once_mutexc O s: | j s6| j�$ | j s,z| ||� W dd| _ X W dQ R X dS )z]Execute this event, but only if it has not been executed already for this collection.NT)rt rs )r r+ r> r r r rp s z_CompoundListener.exec_oncec O s8 x| j D ]}|||� qW x| jD ]}|||� q"W dS )zExecute this event.N)rb ro )r r+ r> r4 r r r rj # s z_CompoundListener.__call__c C s t | j�t | j� S )N)rk rb ro )r r r r rl + s z_CompoundListener.__len__c C s t | j| j�S )N)r rb ro )r r r r r . s z_CompoundListener.__iter__c C s t | jp | j�S )N)r, ro rb )r r r r rm 1 s z_CompoundListener.__bool__N) r r r r rv rp rj rl r rm rq r r r r rr s rr c @ sN e Zd ZdZdZdd� Zdd� Zddd �Zd d � Zd d � Z dd� Z dd� Z dS )rd z�Instance-level attributes on instances of :class:`._Dispatch`. Represents a collection of listeners. As of 0.7.9, _ListenerCollection is only first created via the _EmptyListener.for_modify() method. )rb r` r! ro rN r& c C sJ ||j kr|�|� d| _|j | | _|| _|j| _t�� | _t � | _ d S )NF) r% rH rt rb r` r! rS rT ro rZ rN )r r` rc r r r r6 J s z _ListenerCollection.__init__c C s | S )z�Return an event collection which can be modified. For _ListenerCollection at the instance level of a dispatcher, this returns self. r )r r] r r r r^ T s z _ListenerCollection.for_modifyTc s\ �j }t|�� �j�|j� � ��fdd�|j D �}|�|� |j�|�}t��||� dS )zMPopulate from the listeners in another :class:`_Dispatch` object.c s& g | ] }|� kr�r |�j kr|�qS r )rN )rU �l)�existing_listener_set�only_propagater r r rW e s z/_ListenerCollection._update.<locals>.<listcomp>N)ro rZ rN r= r �unionr Z_stored_in_collection_multi)r r ry Zexisting_listenersZother_listenersZ to_associater )rx ry r r �_update] s z_ListenerCollection._updatec C s$ |� | | j�r |r | j�|j� d S )N)Zprepend_to_listro rN �addrK )r rM rN r r r rR q s z_ListenerCollection.insertc C s$ |� | | j�r |r | j�|j� d S )N)Zappend_to_listro rN r| rK )r rM rN r r r r v s z_ListenerCollection.appendc C s, | j �|j� | j�|j� t�|| � d S )N)ro r rK rN �discardr rY )r rM r r r r { s z_ListenerCollection.removec C s& t �| | j� | j�� | j�� d S )N)r r\ ro rN r )r r r r r � s z_ListenerCollection.clearN)T) r r r r2 r r6 r^ r{ rR r r r r r r r rd 7 s rd c @ sT e Zd ZdZdd� Zedd� �Zdd� Zdd � Zd d � Z d d � Z dd� Z dd� Z dS )rf )r` r! �localrb c C s$ d| _ || _|| _|| _| j| _d S )NF)rt r` r! r~ rb )r r` r! r~ r r r r6 � s z_JoinedListener.__init__c C s t | j| j�S )N)r1 r` r! )r r r r ro � s z_JoinedListener.listenersc C s | j �||�S )N)r~ r: )r r4 r9 r r r r: � s z _JoinedListener._adjust_fn_specc C s | j �|� | _ | _| S )N)r~ r^ rb )r r] r r r r^ � s z_JoinedListener.for_modifyc C s | j �||� d S )N)r~ rR )r rM rN r r r rR � s z_JoinedListener.insertc C s | j �||� d S )N)r~ r )r rM rN r r r r � s z_JoinedListener.appendc C s | j �|� d S )N)r~ r )r rM r r r r � s z_JoinedListener.removec C s t � �d S )N)rh )r r r r r � s z_JoinedListener.clearN) r r r r r6 �propertyro r: r^ rR r r r r r r r rf � s rf )r2 � __future__r r rS � itertoolsr r � r r r r r Z MemoizedSlotsr �objectr r r_ ra rr rd rf r r r r �<module> s& =&O
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