app_handler.py

from services.app.create import create_app
from services.update import update_app
from services.delete import delete_app
from repositories.app import delete_app, find_app_by_id, idempotent_save_app

class AppHandler(object):
    def create(self, name: str, description: str) -> Entity:
        if not validate_create_input(name, description):
            ...
        app = create_app(name, description)
        self.metrics.record_metric(...)
        self.event_publisher("create_entity"..)
        return entity

    def update(self, app_id, name, description):
        if not validate_update_input(app_id, name, description):
            ...
        old_app = find_app_by_id(app_id)
        app = update_app(old_app, name, description)
        self.metrics.record_metric(...)
        self.event_publisher("...")
        return app

    def delete(self, app_id):
        if not validate_delete_input(app_id):
            ...
        app = find_app_by_id(app_id)
        delete_app(app):
        self.metrics.record_metric(...)
        self.event_publisher("...")
        return
    
    def __init__(...):
        self.metrics = ...
        self.event_publisher = ...