Lock based map

locks.go

package main

import (
	"sync"
)

type conn struct{}

type connectionMap struct {
	connections map[string]*conn
	lock        sync.Mutex
}

func NewMap() *connectionMap {
	return &connectionMap{
		connections: make(map[string]*conn),
	}
}

func (cm *connectionMap) get(key string) *conn {
	cm.lock.Lock()
	defer cm.lock.Unlock()
	return cm.connections[key]
}

func (cm *connectionMap) set(key string, c *conn) {
	cm.lock.Lock()
	defer cm.lock.Unlock()
	cm.connections[key] = c
}

func main() {
	myMap := NewMap()
	myMap.set("key", new(conn))
}