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|
package pubsub_test
import (
"github.com/igm/pubsub"
"fmt"
"testing"
"time"
)
func TestSubReader(t *testing.T) {
pub := pubsub.Publisher{}
r, last := pub.SubReader()
if last != nil {
t.Fatal("last message shuold be nil")
}
pub.Publish("msg 1")
pub.Publish("msg 2")
if r.Read() != "msg 1" {
t.Fatal("incorrect message received")
}
if r.Read() != "msg 2" {
t.Fatal("incorrect message received")
}
}
func TestMultipleSubReaders(t *testing.T) {
pub := pubsub.Publisher{}
r, last := pub.SubReader()
if last != nil {
t.Fatal("last message shuold be nil")
}
pub.Publish("msg 1")
r2, last2 := pub.SubReader()
if last2 != "msg 1" {
t.Fatal("last message shuold be nil")
}
pub.Publish("msg 2")
if r.Read() != "msg 1" {
t.Fatal("incorrect message received")
}
if r.Read() != "msg 2" {
t.Fatal("incorrect message received")
}
if r2.Read() != "msg 2" {
t.Fatal("incorrect message received")
}
}
func TestSubChannel(t *testing.T) {
pub := pubsub.Publisher{}
ch, last := pub.SubChannel(nil)
if last != nil {
t.Fatal("last message shuold be nil")
}
pub.Publish("msg 1")
pub.Publish("msg 2")
pub.Publish(nil)
if "msg 1" != <-ch {
t.Fatal("incorrect message received")
}
if "msg 2" != <-ch {
t.Fatal("incorrect message received")
}
if nil != <-ch {
t.Fatal("incorrect message received")
}
if _, ok := <-ch; ok {
t.Fatal("channel should be closed")
}
}
func ExamplePublisher() {
pub := pubsub.Publisher{}
ch, _ := pub.SubChannel(nil)
pub.Publish("msg 1")
pub.Publish("msg 2")
fmt.Println(<-ch)
fmt.Println(<-ch)
// Output:
// msg 1
// msg 2
}
func ExamplePublisher_SubChannel() {
pub := new(pubsub.Publisher)
ch, _ := pub.SubChannel("close")
pub.Publish("msg 1")
pub.Publish("msg 2")
pub.Publish("close")
for msg := range ch {
fmt.Println(msg)
}
// Output:
// msg 1
// msg 2
// close
}
func ExamplePublisher_SubReader() {
type Timer struct {
pubsub.Publisher
}
timer := new(Timer)
go func() {
for /*...*/ {
time.Sleep(time.Second)
timer.Publish(time.Now())
// ...
}
}()
reader, _ := timer.SubReader()
for {
fmt.Println(reader.Read())
}
}
func ExamplePublisher_composition() {
type StockExchange struct {
pubsub.Publisher
}
se := new(StockExchange)
ch, _ := se.SubChannel(nil)
se.Publish("msg 1")
se.Publish("msg 2")
fmt.Println(<-ch)
fmt.Println(<-ch)
// Output:
// msg 1
// msg 2
}
func BenchmarkPubSub(b *testing.B) {
pub := new(pubsub.Publisher)
r1, _ := pub.SubReader()
r2, _ := pub.SubReader()
for i := 0; i < b.N; i++ {
pub.Publish(i)
v1 := r1.Read()
v2 := r2.Read()
if v1 != v2 || v1 != i {
b.Fatal("incorrect value")
}
}
}
|
