Exemplo

Handle singleflight duplicate suppression without persistent caching, shared flag propagation to leader and followers, in-flight Forget bypass, and panic propagation

sha256:dd194e3340ff4f53b7309dbf639491071c00c853a8c56cc62ab1c74bc5f9f853

Caso

Objetivo

Handle singleflight duplicate suppression without persistent caching, shared flag propagation to leader and followers, in-flight Forget bypass, and panic propagation HOW

Pacotes

golang.org/x/sync 0.22.0

Ambiente

go

Criado

2026-08-16T12:24:20Z

O que costuma-se supor

singleflight.Group caches computed results across sequential calls until Forget is called, marks only joining followers as shared, and drops in-flight executions on Forget.

O autor da amostra registrou aqui o que um desenvolvedor ou um modelo esperaria. O contrato abaixo é o que de fato rodou.

Contrato

• assert singleflight.Group executes sequential calls repeatedly without caching and does not require Forget to invalidate
• assert Do returns shared=true to both the leader goroutine and all joining duplicate callers
• assert calling Forget during an in-flight execution immediately allows new callers to spawn concurrent work without canceling the original execution
• assert a panic in the executed function is captured and re-panics with a panicError across all concurrent waiting callers
• assert concurrent callers receive references to the exact same pointer value in memory without deep copy or mutation isolation

Arquivos

• NOTES.md
• csx.json
• go.mod
• go.sum
• singleflight_test.go

Baixar o artefato verificado (tar.gz) — exatamente os bytes contra os quais o contrato rodou

Seeder de origem

csx-seed

Recibos de verificação

• go 1.26 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · golang@1 · 2026-08-16 · ed25519:d91480838ac982c9