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// Copyright 2018 Google Inc.
//
// 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 state
import (
"bytes"
"fmt"
"reflect"
"sort"
"time"
)
type statEntry struct {
count uint
total time.Duration
}
// Stats tracks encode / decode timing.
//
// This currently provides a meaningful String function and no other way to
// extract stats about individual types.
//
// All exported receivers accept nil.
type Stats struct {
// byType contains a breakdown of time spent by type.
byType map[reflect.Type]*statEntry
// stack contains objects in progress.
stack []reflect.Type
// last is the last start time.
last time.Time
}
// sample adds the samples to the given object.
func (s *Stats) sample(typ reflect.Type) {
now := time.Now()
s.byType[typ].total += now.Sub(s.last)
s.last = now
}
// Add adds a sample count.
func (s *Stats) Add(obj reflect.Value) {
if s == nil {
return
}
if s.byType == nil {
s.byType = make(map[reflect.Type]*statEntry)
}
typ := obj.Type()
entry, ok := s.byType[typ]
if !ok {
entry = new(statEntry)
s.byType[typ] = entry
}
entry.count++
}
// Start starts a sample.
func (s *Stats) Start(obj reflect.Value) {
if s == nil {
return
}
if len(s.stack) > 0 {
last := s.stack[len(s.stack)-1]
s.sample(last)
} else {
// First time sample.
s.last = time.Now()
}
s.stack = append(s.stack, obj.Type())
}
// Done finishes the current sample.
func (s *Stats) Done() {
if s == nil {
return
}
last := s.stack[len(s.stack)-1]
s.sample(last)
s.stack = s.stack[:len(s.stack)-1]
}
type sliceEntry struct {
typ reflect.Type
entry *statEntry
}
// String returns a table representation of the stats.
func (s *Stats) String() string {
if s == nil || len(s.byType) == 0 {
return "(no data)"
}
// Build a list of stat entries.
ss := make([]sliceEntry, 0, len(s.byType))
for typ, entry := range s.byType {
ss = append(ss, sliceEntry{
typ: typ,
entry: entry,
})
}
// Sort by total time (descending).
sort.Slice(ss, func(i, j int) bool {
return ss[i].entry.total > ss[j].entry.total
})
// Print the stat results.
var (
buf bytes.Buffer
count uint
total time.Duration
)
buf.WriteString("\n")
buf.WriteString(fmt.Sprintf("%12s | %8s | %8s | %s\n", "total", "count", "per", "type"))
buf.WriteString("-------------+----------+----------+-------------\n")
for _, se := range ss {
count += se.entry.count
total += se.entry.total
per := se.entry.total / time.Duration(se.entry.count)
buf.WriteString(fmt.Sprintf("%12s | %8d | %8s | %s\n",
se.entry.total, se.entry.count, per, se.typ.String()))
}
buf.WriteString("-------------+----------+----------+-------------\n")
buf.WriteString(fmt.Sprintf("%12s | %8d | %8s | [all]",
total, count, total/time.Duration(count)))
return string(buf.Bytes())
}
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