ok && read.amended { // 加锁访问Map.dirty m.mu.Lock() // 双重检测:若加锁前Map.dirty被替换为readonly,则前面m.read.Load().(readOnly)无效,需 // 要再次检查 read, _ = m.read.Load().(readOnly) e, ok = read.m[key] // read.m没有此key && dirty
sync.Map更适合读多更新多而插入新值少的场景(appendOnly模式,尤其是key存一次,多次读而且不删除的情况),因为在key存在的情况下读写删操作可以不用加锁直接访问readOnly不适合反复插入与读取新值的场景,因为这种场景会频繁操作dirty,需要频繁加锁和更新read【此场景github开源库orcaman/concurrent-map更合适】 3.2 设...
并通过回调更新属性rpc GetAttributes (GetAttributesReq) returns (GetAttributesResp);rpc SetAttributes (SetAttributesReq) returns (SetAttributesResp); rpc Connect (AuthReq) returns (GetAttributesResp);rpc Disconnect (AuthReq) returns (empty);} message AuthReq { string identity = 1; map<string, ...
packagewalletimport("bytes""crypto/elliptic""encoding/gob""fmt""io/ioutil""log""os")constwalletFile ="./tmp/wallets.data"typeWalletsstruct{ Walletsmap[string]*Wallet }funcCreateWallets() (*Wallets,error) { wallets :=Wallets{} wallets.Wallets=make(map[string]*Wallet) err :=wallets.LoadFile...
$ go run viper_get_item.go [IsSet()]mysql.host is set mysql - host: 127.0.0.1 , username: root , port: 3306 mysql ports : [5799 6029] metric port: 2112 redis - 127.0.0.1:33000 mysqlmap - map[host:127.0.0.1 metric: password:123456 port:3306 ports: username:root] , username: roo...
go 中还有一个第三方的 ConcurrentMap,其采用分段锁的原理,通过降低锁的粒度提升性能,参见:current-map 针对map、sync.map、ConcurrentMap 的测试如下: const mapCnt = 20 func BenchmarkStdMapGetSet(b *testing.B) { mp := map[string]string{}
package main import ( "fmt" "sync" "time" ) type Container struct { sync.Mutex // <-- Added a mutex counters map[string]int } func (c Container) inc(name string) { c.Lock() // <-- Added locking of the mutex defer c.Unlock() c.counters[name]++ } func main() { c := Con...
针对map、sync.map、ConcurrentMap 的测试如下: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 const mapCnt = 20 func BenchmarkStdMapGetSet(b *testing.B) { mp := map[string]string{} keys := []string{"a", "b", "c", "e", "f", "g", "h", "i", "j", "k", "l", "...
newCacheWithJanitor(de time.Duration, ci time.Duration, m map[string]Item) *Cache { c := newCache(de, m) // This trick ensures that the janitor goroutine (which--granted it // was enabled--is running DeleteExpired on c forever) does not keep // the returned C object from being ...
支持array、slice、map、string、channel 和自定义集合类 go-linq 提供的方法可以按照是否支持泛型分为两大类。泛型方法都以T结尾。非泛型方法需要将函数的入参类型限制为interface{}并做类型断言。 基本使用 牛刀小试 首先,肯定是先引入包: go get /ahmetb/go-linq/v3 ...