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Traverses the entire inheritance graph of a cls and returns a
collection of instrumentation factories for those classes. Factories
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instrumentation_finders is consulted.
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Zd Zd Zd Zd Zd ZdS )InstrumentationManageraW User-defined class instrumentation extension.
:class:`.InstrumentationManager` can be subclassed in order
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how class instrumentation proceeds. This class exists for
the purposes of integration with other object management
frameworks which would like to entirely modify the
instrumentation methodology of the ORM, and is not intended
for regular usage. For interception of class instrumentation
events, see :class:`.InstrumentationEvents`.
The API for this class should be considered as semi-stable,
and may change slightly with new releases.
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1 1 1 : : : r r- c t t t j t j t j dS )a Replace global class/object management functions
with ExtendedInstrumentationRegistry implementations, which
allow multiple types of class managers to be present,
at the cost of performance.
This function is called only by ExtendedInstrumentationRegistry
and unit tests specific to this behavior.
The _reinstall_default_lookups() function can be called
after this one to re-establish the default functions.
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