Usage Examples 🚩 | Developer Reference 👩💻 | Authors 👫
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Injectable is an elegant and simple Dependency Injection framework built with Heart and designed for Humans.
from typing import Annotated, List
from injectable import Autowired, autowired
from models import Database
from messaging import Broker
class Service:
@autowired
def __init__(
self,
database: Annotated[Database, Autowired],
brokers: Annotated[List[Broker], Autowired],
):
pending = database.get_pending_messages()
for broker in brokers:
broker.send_pending(pending)from abc import ABC
class Broker(ABC):
def send_pending(messages):
... |
from injectable import injectable
@injectable
class Database:
...from messaging import Broker
from injectable import injectable
@injectable
class KafkaProducer(Broker):
...from messaging import Broker
from injectable import injectable
@injectable
class SQSProducer(Broker):
... |
- Autowiring: injection is
transparent to the function. Just decorate the function with
@autowiredand annotate parameters withAutowired, that's it. see an example - Automatic dependency discovery: just call
load_injection_container()at the root of your project or pass the root path as an argument. All classes decorated with@injectablewill be automatically discovered and ready for injection. see reference - Qualifier overloading: declare as many injectables as you like for a single
qualifier or extending the same base class. You can inject all of them just by
specifying a
typing.ListtoAutowired:deps: Annotated[List["qualifier"], Autowired]. see an example - Transparent lazy initialization: passing the argument
lazy=TrueforAutowiredwill make your dependency to be initialized only when actually used, all in a transparent fashion. see an example - Singletons: decorate your class with
@injectable(singleton=True)and only a single instance will be initialized and shared for injection. see an example - Namespaces: specify different namespaces for injectables as in
@injectable(namespace="foo")and then just use them when annotating your parameters as indep: Annotated[..., Autowired(namespace="foo")]. see an example - Linters friendly:
Autowiredis carefully designed to comply with static linter analysis such as PyCharm's to preserve the parameter original type hint.
These are just a few cool and carefully built features for you. Check out our docs!