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timer.go
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90 lines (74 loc) · 1.77 KB
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/*
* Copyright 2019 The CovenantSQL 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 timer
import (
"sync"
"time"
"github.com/CovenantSQL/CovenantSQL/utils/log"
)
// Timer defines a stop watch timer for performance analysis.
type Timer struct {
sync.Mutex
start time.Time
names []string
pivots []time.Time
}
// NewTimer returns a new stop watch timer instance.
func NewTimer() *Timer {
return &Timer{
start: time.Now(),
}
}
// Add records a time pivot.
func (t *Timer) Add(name string) {
t.Lock()
defer t.Unlock()
t.names = append(t.names, name)
t.pivots = append(t.pivots, time.Now())
}
// ToLogFields returns analysis results as log fields.
func (t *Timer) ToLogFields() log.Fields {
var (
m = t.ToMap()
f = log.Fields{}
)
for k, v := range m {
f[k] = v
}
return f
}
// ToMap returns analysis results as time duration map.
func (t *Timer) ToMap() map[string]time.Duration {
t.Lock()
defer t.Unlock()
// calc
lp := len(t.pivots)
m := make(map[string]time.Duration, 1+lp)
for i := 0; i != lp; i++ {
var d time.Duration
if i == 0 {
d = t.pivots[i].Sub(t.start)
} else {
d = t.pivots[i].Sub(t.pivots[i-1])
}
m[t.names[i]] = d
if i+1 == lp {
// last one
m["total"] = t.pivots[i].Sub(t.start)
}
}
return m
}