Make simpler example

pool_test.go

@@ -591,82 +591,72 @@ func TestStress(t *testing.T) {
 	pool.Close()
 }
 
-func exampleDummyServer(laddr string, acceptCount int, recvCountChan chan int) {
+func startAcceptOnceDummyServer(laddr string) {
 	ln, err := net.Listen("tcp", laddr)
 	if err != nil {
 		log.Fatalln("Listen:", err)
 	}
 
-	for i := 0; i < acceptCount; i++ {
+	// Listen one time
+	go func() {
 		conn, err := ln.Accept()
 		if err != nil {
 			log.Fatalln("Accept:", err)
 		}
 
-		go func() {
-			recvCount := 0
-			for {
-				buf := make([]byte, 1)
-				_, err := conn.Read(buf)
-				if err != nil {
-					recvCountChan <- recvCount
-					return
-				}
-				recvCount += 1
+		for {
+			buf := make([]byte, 1)
+			_, err := conn.Read(buf)
+			if err != nil {
+				return
 			}
-		}()
-	}
+		}
+	}()
+
 }
 
-func Example_Pool() {
+func ExamplePool() {
 	// Dummy server
-	maxPoolSize := 4
-	serverRecvCountChan := make(chan int)
 	laddr := "127.0.0.1:8080"
+	startAcceptOnceDummyServer(laddr)
 
-	// exampleDummyServer only listens maxPoolSize times so if the pool tried to
-	// connect more than that the pool would receive an error.
-	go exampleDummyServer(laddr, maxPoolSize, serverRecvCountChan)
+	// Pool creation
+	constructor := func(context.Context) (interface{}, error) {
+		return net.Dial("tcp", laddr)
+	}
+	destructor := func(value interface{}) {
+		value.(net.Conn).Close()
+	}
+	maxPoolSize := 10
 
-	// Pool usage
-	pool := puddle.NewPool(
-		func(context.Context) (interface{}, error) { return net.Dial("tcp", laddr) },
-		func(value interface{}) { value.(net.Conn).Close() },
-		maxPoolSize,
-	)
+	pool := puddle.NewPool(constructor, destructor, maxPoolSize)
 
-	clientCount := 32
-	opPerClientCount := 100
-	wg := &sync.WaitGroup{}
+	// Use pool multiple times
+	for i := 0; i < 10; i++ {
+		// Acquire resource
+		res, err := pool.Acquire(context.Background())
+		if err != nil {
+			log.Fatalln("Acquire", err)
+		}
 
-	for i := 0; i < clientCount; i++ {
-		wg.Add(1)
-		go func() {
-			for i := 0; i < opPerClientCount; i++ {
-				res, err := pool.Acquire(context.Background())
-				if err != nil {
-					log.Fatalln("Acquire", err)
-				}
-				_, err = res.Value().(net.Conn).Write([]byte{1})
-				if err != nil {
-					log.Fatalln("Write", err)
-				}
-				res.Release()
-			}
-			wg.Done()
-		}()
+		// Type-assert value and use
+		_, err = res.Value().(net.Conn).Write([]byte{1})
+		if err != nil {
+			log.Fatalln("Write", err)
+		}
+
+		// Release when done.
+		res.Release()
 	}
 
-	wg.Wait()
+	stats := pool.Stat()
 	pool.Close()
-	totalRecv := <-serverRecvCountChan
-	totalRecv += <-serverRecvCountChan
-	totalRecv += <-serverRecvCountChan
-	totalRecv += <-serverRecvCountChan
 
-	fmt.Println("Ops:", totalRecv)
+	fmt.Println("Connections:", stats.TotalResources())
+	fmt.Println("Acquires:", stats.AcquireCount())
 	// Output:
-	// Ops: 3200
+	// Connections: 1
+	// Acquires: 10
 }
 
 func BenchmarkPoolAcquireAndRelease(b *testing.B) {