akka/akka-core

Akka Typed / Persistence : add .recover to Effect.persist for faster failure notification

Open

#27,426 opened on Jul 26, 2019

View on GitHubContributor guide
 (2 comments) (0 reactions) (0 assignees)Scala (3,547 forks)batch import
1 - triagedhelp wantedt:typed

Repository metrics

Stars
 (13,277 stars)
PR merge metrics
 (PR metrics pending)

Description

I'd like to be able to notify the replyTo in the case of failure a quickly as possible from Effect.persist. So .recover would be nice. Maybe something like the following:

Effect.persist(ArtifactRead())
  .thenRun(_ => replyTo ! Okay())
  .recover { 
     case ex: Exception => 
         replyTo ! Failure(ex.getMessage)
  }

Contributor guide

Research direction
Study the existing Effect API in akka persistence typed, particularly Effect.persist and its return type. Look at how thenRun and other combinators are implemented. Then design a recover method that handles failure cases and allows notifying replyTo. Consider the semantics of recovery after persist failures and ensure compatibility with existing callback ordering.
Tech stack
scala
Domain
backenddistributed systems
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
Half day
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
ScalaAkkaAkka Persistence
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
60