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Change-Id: I625af65b3fb1815b1af17dc2ef47dd697fdc3fb1
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trying to get remaining must-haves for ORM
Change-Id: I66a3ecbbb8e5ba37c818c8a92737b576ecf012f7
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Also adds some fixes to annotation-based mapping
that have come up, as well as starts to add more
pep-484 test cases
Change-Id: Ia722bbbc7967a11b23b66c8084eb61df9d233fee
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__future__.annotations mode allows us to use non-string
annotations for argument and return types in most cases,
but more importantly it removes a large amount of runtime
overhead that would be spent in evaluating the annotations.
Change-Id: I2f5b6126fe0019713fc50001be3627b664019ede
References: #6810
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Change-Id: I49abf2607e0eb0623650efdf0091b1fb3db737ea
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the discussion at #7387 refers to a condition that seems
to happen in the wild also, such as [1] [2] [3], it's not
entirely clear why this specific spot is how this occurs,
however it's maybe that when the connection is being acquired
from the pool, under load there might be a wait on the connection
pool, leading to more time for another errant thread to be
calling .close(), just a theory.
in this patch we propose using decorators and context managers
along with declarative state declarations to block reentrant
or concurrent calls to methods that conflict with expected
state changes.
The :class:`_orm.Session` (and by extension :class:`.AsyncSession`) now has
new state-tracking functionality that will proactively trap any unexpected
state changes which occur as a particular transactional method proceeds.
This is to allow situations where the :class:`_orm.Session` is being used
in a thread-unsafe manner, where event hooks or similar may be calling
unexpected methods within operations, as well as potentially under other
concurrency situations such as asyncio or gevent to raise an informative
message when the illegal access first occurs, rather than passing silently
leading to secondary failures due to the :class:`_orm.Session` being in an
invalid state.
[1] https://stackoverflow.com/questions/25768428/sqlalchemy-connection-errors
[2] https://groups.google.com/g/sqlalchemy/c/n5oVX3v4WOw
[3] https://github.com/cosmicpython/code/issues/23
Fixes: #7433
Change-Id: I699b935c0ec4e5a63f12cf878af6f7a92a30a3aa
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