1/*
2Copyright 2016 The Kubernetes Authors.
3
4Licensed under the Apache License, Version 2.0 (the "License");
5you may not use this file except in compliance with the License.
6You may obtain a copy of the License at
7
8    http://www.apache.org/licenses/LICENSE-2.0
9
10Unless required by applicable law or agreed to in writing, software
11distributed under the License is distributed on an "AS IS" BASIS,
12WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13See the License for the specific language governing permissions and
14limitations under the License.
15*/
16
17package cache
18
19import (
20	"sync"
21	"testing"
22	"time"
23
24	"k8s.io/apimachinery/pkg/util/wait"
25)
26
27const (
28	concurrencyLevel = 5
29)
30
31func BenchmarkListener(b *testing.B) {
32	var notification addNotification
33
34	var swg sync.WaitGroup
35	swg.Add(b.N)
36	b.SetParallelism(concurrencyLevel)
37	// Preallocate enough space so that benchmark does not run out of it
38	pl := newProcessListener(&ResourceEventHandlerFuncs{
39		AddFunc: func(obj interface{}) {
40			swg.Done()
41		},
42	}, 0, 0, time.Now(), 1024*1024)
43	var wg wait.Group
44	defer wg.Wait()       // Wait for .run and .pop to stop
45	defer close(pl.addCh) // Tell .run and .pop to stop
46	wg.Start(pl.run)
47	wg.Start(pl.pop)
48
49	b.ReportAllocs()
50	b.ResetTimer()
51	b.RunParallel(func(pb *testing.PB) {
52		for pb.Next() {
53			pl.add(notification)
54		}
55	})
56	swg.Wait() // Block until all notifications have been received
57	b.StopTimer()
58}
59