mirror of
https://github.com/restic/restic.git
synced 2024-12-24 16:54:00 +00:00
109 lines
3.1 KiB
Go
109 lines
3.1 KiB
Go
// Copyright 2017, OpenCensus Authors
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
//
|
|
|
|
package stats
|
|
|
|
import (
|
|
"sync"
|
|
"sync/atomic"
|
|
)
|
|
|
|
// Measure represents a single numeric value to be tracked and recorded.
|
|
// For example, latency, request bytes, and response bytes could be measures
|
|
// to collect from a server.
|
|
//
|
|
// Measures by themselves have no outside effects. In order to be exported,
|
|
// the measure needs to be used in a View. If no Views are defined over a
|
|
// measure, there is very little cost in recording it.
|
|
type Measure interface {
|
|
// Name returns the name of this measure.
|
|
//
|
|
// Measure names are globally unique (among all libraries linked into your program).
|
|
// We recommend prefixing the measure name with a domain name relevant to your
|
|
// project or application.
|
|
//
|
|
// Measure names are never sent over the wire or exported to backends.
|
|
// They are only used to create Views.
|
|
Name() string
|
|
|
|
// Description returns the human-readable description of this measure.
|
|
Description() string
|
|
|
|
// Unit returns the units for the values this measure takes on.
|
|
//
|
|
// Units are encoded according to the case-sensitive abbreviations from the
|
|
// Unified Code for Units of Measure: http://unitsofmeasure.org/ucum.html
|
|
Unit() string
|
|
}
|
|
|
|
// measureDescriptor is the untyped descriptor associated with each measure.
|
|
// Int64Measure and Float64Measure wrap measureDescriptor to provide typed
|
|
// recording APIs.
|
|
// Two Measures with the same name will have the same measureDescriptor.
|
|
type measureDescriptor struct {
|
|
subs int32 // access atomically
|
|
|
|
name string
|
|
description string
|
|
unit string
|
|
}
|
|
|
|
func (m *measureDescriptor) subscribe() {
|
|
atomic.StoreInt32(&m.subs, 1)
|
|
}
|
|
|
|
func (m *measureDescriptor) subscribed() bool {
|
|
return atomic.LoadInt32(&m.subs) == 1
|
|
}
|
|
|
|
var (
|
|
mu sync.RWMutex
|
|
measures = make(map[string]*measureDescriptor)
|
|
)
|
|
|
|
func registerMeasureHandle(name, desc, unit string) *measureDescriptor {
|
|
mu.Lock()
|
|
defer mu.Unlock()
|
|
|
|
if stored, ok := measures[name]; ok {
|
|
return stored
|
|
}
|
|
m := &measureDescriptor{
|
|
name: name,
|
|
description: desc,
|
|
unit: unit,
|
|
}
|
|
measures[name] = m
|
|
return m
|
|
}
|
|
|
|
// Measurement is the numeric value measured when recording stats. Each measure
|
|
// provides methods to create measurements of their kind. For example, Int64Measure
|
|
// provides M to convert an int64 into a measurement.
|
|
type Measurement struct {
|
|
v float64
|
|
m Measure
|
|
desc *measureDescriptor
|
|
}
|
|
|
|
// Value returns the value of the Measurement as a float64.
|
|
func (m Measurement) Value() float64 {
|
|
return m.v
|
|
}
|
|
|
|
// Measure returns the Measure from which this Measurement was created.
|
|
func (m Measurement) Measure() Measure {
|
|
return m.m
|
|
}
|