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prefect.server.models.concurrency_limits

Functions for interacting with concurrency limit ORM objects. Intended for internal use by the Prefect REST API.

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Functions

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create_concurrency_limit 

create_concurrency_limit(db: PrefectDBInterface, session: AsyncSession, concurrency_limit: schemas.core.ConcurrencyLimit) -> orm_models.ConcurrencyLimit

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read_concurrency_limit 

read_concurrency_limit(db: PrefectDBInterface, session: AsyncSession, concurrency_limit_id: UUID) -> Union[orm_models.ConcurrencyLimit, None]
Reads a concurrency limit by id. If used for orchestration, simultaneous read race conditions might allow the concurrency limit to be temporarily exceeded.

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read_concurrency_limit_by_tag 

read_concurrency_limit_by_tag(db: PrefectDBInterface, session: AsyncSession, tag: str) -> Union[orm_models.ConcurrencyLimit, None]
Reads a concurrency limit by tag. If used for orchestration, simultaneous read race conditions might allow the concurrency limit to be temporarily exceeded.

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reset_concurrency_limit_by_tag 

reset_concurrency_limit_by_tag(db: PrefectDBInterface, session: AsyncSession, tag: str, slot_override: Optional[List[UUID]] = None) -> Union[orm_models.ConcurrencyLimit, None]
Resets a concurrency limit by tag.

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filter_concurrency_limits_for_orchestration 

filter_concurrency_limits_for_orchestration(db: PrefectDBInterface, session: AsyncSession, tags: List[str]) -> Sequence[orm_models.ConcurrencyLimit]
Filters concurrency limits by tag. This will apply a “select for update” lock on these rows to prevent simultaneous read race conditions from enabling the the concurrency limit on these tags from being temporarily exceeded.

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delete_concurrency_limit 

delete_concurrency_limit(db: PrefectDBInterface, session: AsyncSession, concurrency_limit_id: UUID) -> bool

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delete_concurrency_limit_by_tag 

delete_concurrency_limit_by_tag(db: PrefectDBInterface, session: AsyncSession, tag: str) -> bool

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read_concurrency_limits 

read_concurrency_limits(db: PrefectDBInterface, session: AsyncSession, limit: Optional[int] = None, offset: Optional[int] = None) -> Sequence[orm_models.ConcurrencyLimit]
Reads a concurrency limits. If used for orchestration, simultaneous read race conditions might allow the concurrency limit to be temporarily exceeded. Args:
  • session: A database session
  • offset: Query offset
  • limit: Query limit
Returns:
  • List[orm_models.ConcurrencyLimit]: concurrency limits