spakky-task 6.1.3

Task queue abstraction for Spakky Framework (@TaskHandler, @task)

spakky-task

Task queue abstraction layer for Spakky Framework.

Installation

pip install spakky-task

Features

• @TaskHandler stereotype: Marks classes as task handler pods
• @task decorator: Marks methods as on-demand dispatchable tasks
• @schedule decorator: Marks methods for periodic execution (interval, daily, crontab)
• Crontab value object: Python-native cron specification with Weekday/Month enums
• Post-processor: Automatically scans and registers task routes from @TaskHandler pods
• Implementation-agnostic: Works with any task queue backend (Celery, etc.) via plugins

Usage

On-Demand Tasks

@task marks methods for on-demand dispatch. The backend plugin (e.g., spakky-celery) intercepts calls via AOP and routes them to the task queue.

from spakky.task import TaskHandler, task


@TaskHandler()
class EmailTaskHandler:
    @task
    def send_email(self, to: str, subject: str, body: str) -> None:
        """Dispatched to the task queue when called."""
        ...

Scheduled Tasks

@schedule marks methods for periodic execution. Exactly one of interval, at, or crontab must be specified.

from datetime import time, timedelta

from spakky.task import TaskHandler, Crontab, Weekday, schedule


@TaskHandler()
class MaintenanceHandler:
    @schedule(interval=timedelta(minutes=30))
    def health_check(self) -> None:
        """Runs every 30 minutes."""
        ...

    @schedule(at=time(3, 0))
    def daily_cleanup(self) -> None:
        """Runs daily at 03:00."""
        ...

    @schedule(crontab=Crontab(weekday=Weekday.MONDAY, hour=9))
    def weekly_report(self) -> None:
        """Runs every Monday at 09:00."""
        ...

Crontab Specification

Crontab uses Python-native types instead of cron strings. None means "every" (wildcard).

from spakky.task import Crontab, Weekday, Month

# Every Monday at 03:00
Crontab(weekday=Weekday.MONDAY, hour=3)

# Mon/Wed/Fri at 09:00
Crontab(weekday=(Weekday.MONDAY, Weekday.WEDNESDAY, Weekday.FRIDAY), hour=9)

# 1st and 15th of every month at midnight
Crontab(day=(1, 15))

# Every January 1st at midnight
Crontab(month=Month.JANUARY, day=1)

Field order (descending temporal granularity):

Field	Type	Default
month	Month | tuple[Month, ...] | None	None (every)
day	int | tuple[int, ...] | None	None (every)
weekday	Weekday | tuple[Weekday, ...] | None	None (every)
hour	int	0
minute	int	0

Accessing Task Routes

from spakky.task import TaskRegistrationPostProcessor

post_processor = container.get(TaskRegistrationPostProcessor)
routes = post_processor.get_task_routes()
# {<bound method send_email>: TaskRoute(), ...}

Components

Component	Description
TaskHandler	Stereotype decorator for task handler classes
@task	Method decorator for on-demand task dispatch
@schedule	Method decorator for periodic execution (interval, at, crontab)
TaskRoute	Annotation for @task methods
ScheduleRoute	Annotation for @schedule methods
Crontab	Frozen dataclass for cron-like schedule specification
Weekday	IntEnum for day of the week (Monday=0 ... Sunday=6)
Month	IntEnum for month of the year (January=1 ... December=12)
TaskRegistrationPostProcessor	Scans @TaskHandler pods and collects @task methods

Errors

Error	Description
TaskNotFoundError	Task reference not found in the registry
DuplicateTaskError	Attempting to register an already-registered task
InvalidScheduleSpecificationError	@schedule called with zero or multiple schedule options

Related Packages

• spakky-celery: Celery backend for task dispatch and schedule registration via AOP

License

MIT License