https://github.com/t2bot/go-typed-singleflight
Generic-supporting golang.org/x/sync/singleflight
https://github.com/t2bot/go-typed-singleflight
Last synced: 6 months ago
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Generic-supporting golang.org/x/sync/singleflight
- Host: GitHub
- URL: https://github.com/t2bot/go-typed-singleflight
- Owner: t2bot
- License: apache-2.0
- Created: 2023-08-21T00:54:56.000Z (almost 3 years ago)
- Default Branch: main
- Last Pushed: 2023-08-21T01:31:11.000Z (almost 3 years ago)
- Last Synced: 2025-02-06T09:51:22.278Z (over 1 year ago)
- Language: Go
- Size: 8.79 KB
- Stars: 0
- Watchers: 1
- Forks: 0
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# go-typed-singleflight
Generic-supporting [golang.org/x/sync/singleflight](https://golang.org/x/sync/singleflight).
Example usage ([Go Playground](https://go.dev/play/p/jPDKiE7pNp_4)):
```go
package main
import (
"fmt"
"sync"
"time"
typedsf "github.com/t2bot/go-typed-singleflight"
)
type MyValue string
func main() {
g := new(typedsf.Group[MyValue])
workFn := func() (MyValue, error) {
// for example purposes only, sleep for a moment
time.Sleep(1 * time.Second)
return MyValue("this is a value"), nil
}
key := "my_resource" // deduplication key
// This loop simulates multiple requests
wg := new(sync.WaitGroup)
for i := 0; i < 5; i++ {
wg.Add(1)
go func() {
defer wg.Done()
val, err, shared := g.Do(key, workFn)
if err != nil {
panic(err)
}
if shared {
fmt.Println("Response was shared!")
// When true, the workFn was only called once and its output used
// multiple times.
} else {
// This might happen - it's dependent on the underlying singleflight
// library behaviour.
fmt.Println("WARN: Response was not shared!")
}
fmt.Println("Got val: ", val)
}()
}
fmt.Println("Waiting for all requests to finish")
wg.Wait()
fmt.Println("Done!")
}
```