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// Copyright 2015 The Vanadium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package stats
import (
// NewCounter creates a new Counter StatsObject with the given name and
// returns a pointer to it.
func NewCounter(name string) *counter.Counter {
defer lock.Unlock()
node := findNodeLocked(name, true)
c := counter.New()
cw := &counterWrapper{c}
node.object = cw
addCounterChild(node, name+"/delta1h", cw, time.Hour, cw.Delta1h)
addCounterChild(node, name+"/delta10m", cw, 10*time.Minute, cw.Delta10m)
addCounterChild(node, name+"/delta1m", cw, time.Minute, cw.Delta1m)
addCounterChild(node, name+"/rate1h", cw, time.Hour, cw.Rate1h)
addCounterChild(node, name+"/rate10m", cw, 10*time.Minute, cw.Rate10m)
addCounterChild(node, name+"/rate1m", cw, time.Minute, cw.Rate1m)
return c
type counterWrapper struct {
c *counter.Counter
func (cw counterWrapper) LastUpdate() time.Time {
return cw.c.LastUpdate()
func (cw counterWrapper) Value() interface{} {
return cw.c.Value()
func (cw counterWrapper) Delta1h() interface{} {
return cw.c.Delta1h()
func (cw counterWrapper) Delta10m() interface{} {
return cw.c.Delta10m()
func (cw counterWrapper) Delta1m() interface{} {
return cw.c.Delta1m()
func (cw counterWrapper) Rate1h() interface{} {
return cw.c.Rate1h()
func (cw counterWrapper) Rate10m() interface{} {
return cw.c.Rate10m()
func (cw counterWrapper) Rate1m() interface{} {
return cw.c.Rate1m()
type counterChild struct {
c *counterWrapper
period time.Duration
value func() interface{}
func (cc counterChild) LastUpdate() time.Time {
now := time.Now()
if t := cc.c.LastUpdate().Add(cc.period); t.Before(now) {
return t
return now
func (cc counterChild) Value() interface{} {
return cc.value()
func addCounterChild(parent *node, name string, c *counterWrapper, period time.Duration, value func() interface{}) {
child := findNodeLocked(name, true)
child.object = &counterChild{c, period, value}