Codes – typed application outcomes for Kotlin and Java

[aalsanie]

https://github.com/aalsanie/codes

[0x445442]

Result<T> { String resultCode; T data; List<String> errors; }

[looksjjhg]

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 !?

[qw → 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

[soltanov]

Title can be "Codes - typed application return values for Kotlin and Java".