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package event
import (
"math/rand"
"sync"
"testing"
"time"
)
type testEvent int
func TestSub(t *testing.T) {
mux := new(TypeMux)
defer mux.Stop()
sub := mux.Subscribe(testEvent(0))
go func() {
if err := mux.Post(testEvent(5)); err != nil {
t.Errorf("Post returned unexpected error: %v", err)
}
}()
ev := <-sub.Chan()
if ev.(testEvent) != testEvent(5) {
t.Errorf("Got %v (%T), expected event %v (%T)",
ev, ev, testEvent(5), testEvent(5))
}
}
func TestMuxErrorAfterStop(t *testing.T) {
mux := new(TypeMux)
mux.Stop()
sub := mux.Subscribe(testEvent(0))
if _, isopen := <-sub.Chan(); isopen {
t.Errorf("subscription channel was not closed")
}
if err := mux.Post(testEvent(0)); err != ErrMuxClosed {
t.Errorf("Post error mismatch, got: %s, expected: %s", err, ErrMuxClosed)
}
}
func TestUnsubscribeUnblockPost(t *testing.T) {
mux := new(TypeMux)
defer mux.Stop()
sub := mux.Subscribe(testEvent(0))
unblocked := make(chan bool)
go func() {
mux.Post(testEvent(5))
unblocked <- true
}()
select {
case <-unblocked:
t.Errorf("Post returned before Unsubscribe")
default:
sub.Unsubscribe()
<-unblocked
}
}
func TestMuxConcurrent(t *testing.T) {
rand.Seed(time.Now().Unix())
mux := new(TypeMux)
defer mux.Stop()
recv := make(chan int)
poster := func() {
for {
err := mux.Post(testEvent(0))
if err != nil {
return
}
}
}
sub := func(i int) {
time.Sleep(time.Duration(rand.Intn(99)) * time.Millisecond)
sub := mux.Subscribe(testEvent(0))
<-sub.Chan()
sub.Unsubscribe()
recv <- i
}
go poster()
go poster()
go poster()
nsubs := 1000
for i := 0; i < nsubs; i++ {
go sub(i)
}
// wait until everyone has been served
counts := make(map[int]int, nsubs)
for i := 0; i < nsubs; i++ {
counts[<-recv]++
}
for i, count := range counts {
if count != 1 {
t.Errorf("receiver %d called %d times, expected only 1 call", i, count)
}
}
}
func emptySubscriber(mux *TypeMux, types ...interface{}) {
s := mux.Subscribe(testEvent(0))
go func() {
for _ = range s.Chan() {
}
}()
}
func BenchmarkPost3(b *testing.B) {
var mux = new(TypeMux)
defer mux.Stop()
emptySubscriber(mux, testEvent(0))
emptySubscriber(mux, testEvent(0))
emptySubscriber(mux, testEvent(0))
for i := 0; i < b.N; i++ {
mux.Post(testEvent(0))
}
}
func BenchmarkPostConcurrent(b *testing.B) {
var mux = new(TypeMux)
defer mux.Stop()
emptySubscriber(mux, testEvent(0))
emptySubscriber(mux, testEvent(0))
emptySubscriber(mux, testEvent(0))
var wg sync.WaitGroup
poster := func() {
for i := 0; i < b.N; i++ {
mux.Post(testEvent(0))
}
wg.Done()
}
wg.Add(5)
for i := 0; i < 5; i++ {
go poster()
}
wg.Wait()
}
// for comparison
func BenchmarkChanSend(b *testing.B) {
c := make(chan interface{})
closed := make(chan struct{})
go func() {
for _ = range c {
}
}()
for i := 0; i < b.N; i++ {
select {
case c <- i:
case <-closed:
}
}
}
|
