110 lines
2.7 KiB
Go
110 lines
2.7 KiB
Go
// Copyright 2013 The Prometheus Authors
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package stats
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import (
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"bytes"
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"fmt"
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"sort"
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"time"
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)
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// A Timer that can be started and stopped and accumulates the total time it
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// was running (the time between Start() and Stop()).
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type Timer struct {
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name fmt.Stringer
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created time.Time
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start time.Time
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duration time.Duration
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}
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// Start the timer.
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func (t *Timer) Start() *Timer {
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t.start = time.Now()
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return t
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}
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// Stop the timer.
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func (t *Timer) Stop() {
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t.duration += time.Since(t.start)
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}
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// ElapsedTime returns the time that passed since starting the timer.
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func (t *Timer) ElapsedTime() time.Duration {
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return time.Since(t.start)
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}
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// Return a string representation of the Timer.
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func (t *Timer) String() string {
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return fmt.Sprintf("%s: %s", t.name, t.duration)
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}
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// A TimerGroup represents a group of timers relevant to a single query.
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type TimerGroup struct {
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timers map[fmt.Stringer]*Timer
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child *TimerGroup
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}
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// NewTimerGroup constructs a new TimerGroup.
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func NewTimerGroup() *TimerGroup {
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return &TimerGroup{timers: map[fmt.Stringer]*Timer{}}
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}
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// GetTimer gets (and creates, if necessary) the Timer for a given code section.
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func (t *TimerGroup) GetTimer(name fmt.Stringer) *Timer {
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if timer, exists := t.timers[name]; exists {
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return timer
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}
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timer := &Timer{
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name: name,
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created: time.Now(),
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}
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t.timers[name] = timer
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return timer
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}
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// Timers is a slice of Timer pointers that implements Len and Swap from
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// sort.Interface.
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type Timers []*Timer
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type byCreationTimeSorter struct{ Timers }
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// Len implements sort.Interface.
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func (t Timers) Len() int {
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return len(t)
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}
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// Swap implements sort.Interface.
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func (t Timers) Swap(i, j int) {
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t[i], t[j] = t[j], t[i]
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}
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func (s byCreationTimeSorter) Less(i, j int) bool {
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return s.Timers[i].created.Before(s.Timers[j].created)
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}
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// Return a string representation of a TimerGroup.
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func (t *TimerGroup) String() string {
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timers := byCreationTimeSorter{}
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for _, timer := range t.timers {
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timers.Timers = append(timers.Timers, timer)
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}
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sort.Sort(timers)
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result := &bytes.Buffer{}
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for _, timer := range timers.Timers {
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fmt.Fprintf(result, "%s\n", timer)
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}
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return result.String()
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}
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