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retrieval.cpython-39.pyc
a ���g� � @ s� d Z ddlmZ ddlmZ ddlmZmZ ddlZzddl m Z W n e yb ddlm Z Y n0 ddl m Z er�ddlmZmZmZ e d ed �Zdeje jfd d d dd�dd�ZdS )z2 Helpers related to (dynamic) resource retrieval. � )� annotations�� lru_cache)� TYPE_CHECKING�CallableN)�TypeVar)�Resource)�URI�D�Retrieve�_T)�defaultz+Callable[[Retrieve[D]], Retrieve[D]] | NonezCallable[[_T], D]zCallable[[D], Resource[D]]z,Callable[[Callable[[URI], _T]], Retrieve[D]])�cache�loads� from_contents�returnc s, � du rt dd�� dd�� ��fdd� }|S )aG Create a retriever which caches its return values from a simpler callable. Takes a function which returns things like serialized JSON (strings) and returns something suitable for passing to `Registry` as a retrieve function. This decorator both reduces a small bit of boilerplate for a common case (deserializing JSON from strings and creating `Resource` objects from the result) as well as makes the probable need for caching a bit easier. Retrievers which otherwise do expensive operations (like hitting the network) might otherwise be called repeatedly. Examples -------- .. testcode:: from referencing import Registry from referencing.typing import URI import referencing.retrieval @referencing.retrieval.to_cached_resource() def retrieve(uri: URI): print(f"Retrieved {uri}") # Normally, go get some expensive JSON from the network, a file ... return ''' { "$schema": "https://json-schema.org/draft/2020-12/schema", "foo": "bar" } ''' one = Registry(retrieve=retrieve).get_or_retrieve("urn:example:foo") print(one.value.contents["foo"]) # Retrieving the same URI again reuses the same value (and thus doesn't # print another retrieval message here) two = Registry(retrieve=retrieve).get_or_retrieve("urn:example:foo") print(two.value.contents["foo"]) .. testoutput:: Retrieved urn:example:foo bar bar N)�maxsizezCallable[[URI], _T]��retrievec s �dd���� fdd� �}|S )Nr )�uric s �| �}�|�}� |�S )N� )r �response�contents)r r r r �F/opt/nydus/tmp/pip-target-mke_irhy/lib/python/referencing/retrieval.py�cached_retrieveT s z>to_cached_resource.<locals>.decorator.<locals>.cached_retriever )r r �r r r r r � decoratorS s z%to_cached_resource.<locals>.decoratorr )r r r r r r r �to_cached_resource s 7 r )�__doc__� __future__r � functoolsr �typingr r �jsonZtyping_extensionsr � ImportErrorZ referencingr Zreferencing.typingr r r �strr r r r r r r r �<module> s �