Codes – typed application outcomes for Kotlin and Java

github.com5 pointsby aalsanie2 comments

Join the discussion

Write your take first — we'll ask for email only when you're ready to publish.

Hacker News
Title can be "Codes - typed application return values for Kotlin and Java".
by soltanov
I’ve read the readme 3 times and I still don’t understand what it is … it looks like someone learning effect systems but not quite there yet !?
by looksjjhg
From what I can tell it is a library for standardising return values that is independent on the transport medium. A HTTP service may return a particular http code or body, and gRPC would have its own representation.
I think this library maps the different representations into a single representation. The business logic, metrics, logging etc. will use the single representation instead of being tightly coupled to the transport medium
Example from the docs where the "PAYMENT_DECLINED" state is mapped from protocol specific responses:
```
  PAYMENT_DECLINED
  |
  +-- HTTP 422
  +-- gRPC FAILED_PRECONDITION
  |
  --> logs/metrics keep PAYMENT_DECLINED
```
by qw
Result<T> { String resultCode; T data; List<String> errors; }
by 0x445442