Implementation of dependency injection for apscheduler
Prerequisites:
apscheduler-disolves the problem sinceapschedulerdoesn't support Dependency Injection natively, and it's real problem for developers to pass on complicated objects to jobs without corruptions
Features:
- Supports type hints (PEP 561)
- Extend
apschedulerand provide handy aliases for events(such ason_startup,on_shutdownand etc) - Provide an opportunity to implement Dependency Inversion SOLID principle
"Under the hood" apscheduler-di just implements Decorator pattern and wraps up the work of native BaseScheduler using rodi lib
Quick example:
import os
from typing import Dict
from apscheduler.jobstores.redis import RedisJobStore
from apscheduler.schedulers.blocking import BlockingScheduler
from apscheduler_di import ContextSchedulerDecorator
# pip install redis
job_defaults: Dict[str, RedisJobStore] = {
"default": RedisJobStore(
jobs_key="dispatched_trips_jobs", run_times_key="dispatched_trips_running"
)
}
job_stores: Dict[str, RedisJobStore] = {
"default": RedisJobStore(
jobs_key="dispatched_trips_jobs", run_times_key="dispatched_trips_running"
)
}
class Tack:
def tack(self):
print("Tack!")
def tick(tack: Tack):
print(tack)
def main():
scheduler = ContextSchedulerDecorator(BlockingScheduler(jobstores=job_stores,
job_defaults=job_defaults))
scheduler.ctx.add_instance(Tack(), Tack)
scheduler.add_executor('processpool')
scheduler.add_job(tick, 'interval', seconds=3)
print('Press Ctrl+{0} to exit'.format('Break' if os.name == 'nt' else 'C'))
try:
scheduler.start()
except (KeyboardInterrupt, SystemExit):
pass
if __name__ == '__main__':
main()
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