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example_sharder_test.go
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example_sharder_test.go
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package sharded_test
import (
"context"
"errors"
"fmt"
"os"
"github.com/embano1/memlog"
"github.com/embano1/memlog/sharded"
)
func Example_sharder() {
ctx := context.Background()
keys := []string{"galaxies", "planets"}
ks := sharded.NewKeySharder(keys)
opts := []sharded.Option{
sharded.WithNumShards(2), // must be >=len(keys)
sharded.WithSharder(ks),
}
l, err := sharded.New(ctx, opts...)
if err != nil {
fmt.Printf("create log: %v", err)
os.Exit(1)
}
data := map[string][]string{
keys[0]: {"Centaurus A", "Andromeda", "Eye of Sauron"},
keys[1]: {"Mercury", "Venus", "Earth", "Mars", "Jupiter", "Saturn", "Uranus", "Neptune"},
}
for key, vals := range data {
for _, val := range vals {
_, err := l.Write(ctx, []byte(key), []byte(val))
if err != nil {
fmt.Printf("write: %v", err)
os.Exit(1)
}
}
}
KEYS:
for _, key := range keys {
fmt.Printf("reading all %s...\n", key)
offset := memlog.Offset(0)
for {
read, err := l.Read(ctx, []byte(key), offset)
if err != nil {
if errors.Is(err, memlog.ErrFutureOffset) {
fmt.Println()
continue KEYS
}
fmt.Printf("read: %v", err)
os.Exit(1)
}
fmt.Printf("- %s\n", string(read.Data))
offset++
}
}
// Output: reading all galaxies...
// - Centaurus A
// - Andromeda
// - Eye of Sauron
//
// reading all planets...
// - Mercury
// - Venus
// - Earth
// - Mars
// - Jupiter
// - Saturn
// - Uranus
// - Neptune
}