BaseBackend

Base (synchronous) result backend.

Constructor

Signature

def BaseBackend()

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Signature

def BaseBackend(
    app: [Celery](../../app/base/celery.md?sid=celery_app_base_celery),
    url: string,
    serializer: string,
    max_cached_results: integer
) - > null

Parameters

Name	Type	Description
app	[Celery](../../app/base/celery.md?sid=celery_app_base_celery)	The Celery application instance this backend is associated with
url	string	The connection URL used to configure the backend storage
serializer	string	The name of the serialization format used for task results
max_cached_results	integer	The maximum number of results to keep in the local memory cache

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Methods

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get_status()

def get_status(
    task_id: string
) - > string

Fetches the current status of a task from the backend storage.

Parameters

Name	Type	Description
task_id	string	The unique identifier of the task to query

Returns

Type	Description
string	The state of the task, such as PENDING, SUCCESS, or FAILURE

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store_result()

def store_result(
    task_id: string,
    result: any,
    state: string,
    traceback: string,
    request: object
) - > null

Persists the task result and state into the backend for later retrieval.

Parameters

Name	Type	Description
task_id	string	The unique identifier of the task being updated
result	any	The return value or exception object to be stored
state	string	The state to transition the task into
traceback	string	The stack trace string if the task failed
request	object	The original task request message

Returns

Type	Description
null	None

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wait_for()

def wait_for(
    task_id: string,
    timeout: float,
    propagate: boolean
) - > any

Blocks until the specified task reaches a ready state or the timeout expires.

Parameters

Name	Type	Description
task_id	string	The unique identifier of the task to wait for
timeout	float	The maximum number of seconds to wait before raising a TimeoutError
propagate	boolean	Whether to re-raise any exceptions that occurred during task execution

Returns

Type	Description
any	The decoded result of the task once it is available

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