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main.go
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main.go
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package main
import (
"fmt"
"io/ioutil"
"log"
"os"
"time"
"github.com/nutsdb/nutsdb"
"github.com/xujiajun/utils/strconv2"
)
func readWorker(id int, jobs <-chan int, results chan<- struct{}) {
for j := range jobs {
fmt.Println("readWorker", id, "started job", j)
time.Sleep(time.Second)
key := strconv2.IntToStr(j)
if err := db.View(
func(tx *nutsdb.Tx) error {
value, err := tx.Get(bucket, []byte(key))
if err != nil {
return err
}
fmt.Println("val:", string(value))
return nil
}); err != nil {
log.Println(err)
}
fmt.Println("readWorker", id, "finished job", j)
results <- struct{}{}
}
}
func writeWorker(id int, jobs <-chan int, results chan<- struct{}) {
for j := range jobs {
fmt.Println("writeWorker", id, "started job", j)
time.Sleep(time.Second)
key := strconv2.IntToStr(j)
if err := db.Update(
func(tx *nutsdb.Tx) error {
val := []byte("val" + key)
return tx.Put(bucket, []byte(key), val, 0)
}); err != nil {
log.Fatal(err)
}
fmt.Println("writeWorker", id, "finished job", j)
results <- struct{}{}
}
}
var (
db *nutsdb.DB
err error
bucket string
)
func removeFileDir(fileDir string) {
files, _ := ioutil.ReadDir(fileDir)
for _, f := range files {
name := f.Name()
if name != "" {
fmt.Println(fileDir + "/" + name)
err := os.Remove(fileDir + "/" + name)
if err != nil {
panic(err)
}
}
}
}
func main() {
removeFlag := false
fileDir := "/tmp/nutsdb_example_concurrence"
if removeFlag {
removeFileDir(fileDir)
}
db, err = nutsdb.Open(
nutsdb.DefaultOptions,
nutsdb.WithDir(fileDir),
nutsdb.WithSegmentSize(1024*1024), // 1MB
)
if err != nil {
panic(err)
}
bucket = "bucketForString"
// create bucket first
createBucket()
readJobs := make(chan int, 10)
writeJobs := make(chan int, 10)
readResults := make(chan struct{}, 10)
writeResults := make(chan struct{}, 10)
for w := 1; w <= 3; w++ {
go readWorker(w, readJobs, readResults)
}
for w := 1; w <= 3; w++ {
go writeWorker(w, writeJobs, writeResults)
}
for j := 1; j <= 10; j++ {
readJobs <- j
}
for j := 1; j <= 10; j++ {
writeJobs <- j
}
close(readJobs)
close(writeJobs)
for a := 1; a <= 10; a++ {
<-readResults
}
for a := 1; a <= 10; a++ {
<-writeResults
}
}
func createBucket() {
if err := db.Update(
func(tx *nutsdb.Tx) error {
return tx.NewBucket(nutsdb.DataStructureBTree, bucket)
}); err != nil {
//log.Fatal(err)
}
}