Lil Functor | United States America (US)

Create: 2021-10-19 Update: 2025-07-09 21:09:20

В DI-фреймворке под названием ZIO можно автовайрить зависимости с помощью zio-magic, который ещё и встроят в версию 2.0. Код выглядит примерно так:

ZLayer.fromMagic[Env](
  UsersRepository.live,
  ClientsRepository.live,
  RegistrationService.live
)

А дальше макрос на этапе компиляции выстроит граф зависимостей по входящим типам слоёв. Но частенько в приложении бывают классы, принимающие зависимости одного и того же типа. Допустим, grpc-клиенты к микросервисам BillingClient и NotificatorClient принимают в зависимости GrpcConfig. Содержимое этих конфигов очевидно разное, но на уровне типов этого не видно, поэтому нельзя понять, какой экземляр конфига к кому относится. Можно решить это ручным вайрингом:

ZLayer.fromMagic[Env](
  Grpc.live,
  Config.loadLayer[GrpcConfig]("billing") ++ ZLayer.environment[Has[Grpc]] >>> BillingClient.live,
  Config.loadLayer[GrpcConfig]("notificator") ++ ZLayer.environment[Has[Grpc]] >>> NotificatorClient.live
)

Но мне это не нравится, потому что приходится внедрять куски ручного построения графа зависимостей в плоский список слоёв.

Так как вайринг происходит во время компиляции, различать зависимости нужно на уровне типов. Сразу пришла идея использовать тайп-теги: пометить слой зависимости каким-то тегом, и такой же тип затребовать в слое-получателе. Собственно, после некоторого пердолинга с компилятором было написано такое вот поделие: https://gist.github.com/poslegm/f252994a15453457e64d6498249928f3.

И с ним можно писать уже так:

ZLayer.fromMagic[Env](
  Grpc.live,
  Config.loadLayer[GrpcConfig]("billing").tagged[BillingClient.Service],
  Config.loadLayer[GrpcConfig]("notificator").tagged[NotificatorClient.Service],
  BillingClient.live.requireTagged[GrpcConfig, BillingClient.Service, Has[Grpc]],
  NotificatorClient.live.requireTagged[GrpcConfig, NotificatorClient.Service, Has[Grpc]]
)

К сожалению не получилось придумать реализацию requireTagged, в которой не надо явно указывать компилятору тип "остатка" требуемых слоёв, кроме протегированного.

Зато теперь все зависимости укладываются в один плоский список, а zio-magic ругнётся, если не будет протегированной зависимости к какому-то слою.

Lil Functor

ZLayer.fromMagic[Env](
  UsersRepository.live,
  ClientsRepository.live,
  RegistrationService.live
)

ZLayer.fromMagic[Env](
  Grpc.live,
  Config.loadLayer[GrpcConfig]("billing") ++ ZLayer.environment[Has[Grpc]] >>> BillingClient.live,
  Config.loadLayer[GrpcConfig]("notificator") ++ ZLayer.environment[Has[Grpc]] >>> NotificatorClient.live
)

ZLayer.fromMagic[Env](
  Grpc.live,
  Config.loadLayer[GrpcConfig]("billing").tagged[BillingClient.Service],
  Config.loadLayer[GrpcConfig]("notificator").tagged[NotificatorClient.Service],
  BillingClient.live.requireTagged[GrpcConfig, BillingClient.Service, Has[Grpc]],
  NotificatorClient.live.requireTagged[GrpcConfig, NotificatorClient.Service, Has[Grpc]]
)

hottg.com/lilfunctor/260

2.22K viewsOct 19, 2021 at 17:41

>>Click here to continue<<

Lil Functor

Share with your best friend

Should You Buy Bitcoin?

In general, many financial experts support their clients’ desire to buy cryptocurrency, but they don’t recommend it unless clients express interest. “The biggest concern for us is if someone wants to invest in crypto and the investment they choose doesn’t do well, and then all of a sudden they can’t send their kids to college,” says Ian Harvey, a certified financial planner (CFP) in New York City. “Then it wasn’t worth the risk.” The speculative nature of cryptocurrency leads some planners to recommend it for clients’ “side” investments. “Some call it a Vegas account,” says Scott Hammel, a CFP in Dallas. “Let’s keep this away from our real long-term perspective, make sure it doesn’t become too large a portion of your portfolio.” In a very real sense, Bitcoin is like a single stock, and advisors wouldn’t recommend putting a sizable part of your portfolio into any one company. At most, planners suggest putting no more than 1% to 10% into Bitcoin if you’re passionate about it. “If it was one stock, you would never allocate any significant portion of your portfolio to it,” Hammel says.

В DI-фреймворке под названием ZIO можно автовайрить зависимости с помощью zio-magic

Lil Functor TG
Webview: 260
Telegram TG Webview: hottg.com/lilfunctor/webview
Telegram TG Channel: Lil Functor
Telegram Updated: 2025-07-09 21:09:20

United States America Popular Telegram Group (US)

Telegram Q&A

Q: How does hottg.com work?

Once you've set up a username, you can give people a hottg.com/username link. Opening that link on their phone will automatically fire up their Telegram app and open a chat with you. You can share username links with friends, write them on business cards or put them up on your website.This way people can contact you on Telegram without knowing your phone number.

With Telegram, you can send messages, photos, videos and files of any type (doc, zip, mp3, etc), as well as create groups for up to 200,000 people or channels for broadcasting to unlimited audiences. You can write to your phone contacts and find people by their usernames. As a result, Telegram is like SMS and email combined — and can take care of all your personal or business messaging needs. In addition to this, we support end-to-end encrypted voice calls.

Q: What is Telegram? What do I do here?

Telegram is a messaging app with a focus on speed and security, it’s super-fast, simple and free. You can use Telegram on all your devices at the same time — your messages sync seamlessly across any number of your phones, tablets or computers.

Q: Who is Telegram for?

Telegram is for everyone who wants fast and reliable messaging and calls. Business users and small teams may like the large groups, usernames, desktop apps and powerful file sharing options. You can appoint admins with advanced tools to help these communities prosper in peace. Public groups can be joined by anyone and are powerful platforms for discussions and collecting feedback.In case you're more into pictures, Telegram has animated gif search, a state of the art photo editor, and an open sticker platform (find some cool stickers here or here). What's more, there is no need to worry about disk space on your device. With Telegram's cloud support and cache management options, Telegram can take up nearly zero space on your phone.

Q: How is Telegram different from WhatsApp?

Unlike WhatsApp, Telegram is a cloud-based messenger with seamless sync. As a result, you can access your messages from several devices at once, including tablets and computers, and share an unlimited number of photos, videos and files (doc, zip, mp3, etc.) of up to 2 GB each. And if you don't want to store all that data on your device, you can always keep it in the cloud.Thanks to our multi-data center infrastructure and encryption, Telegram is faster and way more secure. On top of that, Telegram is free and will stay free — no ads, no subscription fees, forever.

Q: Can I make calls via Telegram?

Yes! Voice calls are currently available to users around the world.

Many modern travelers appear to struggle with managing various aspects of their finances simultaneously while abroad, such as banking, budgeting, investing, trading, and saving. It is important to have apps installed on the device that will help you carry out these necessary tasks.

Hot Topic in US