update

Author: TLexYuW

06-select-timeout/README.md

@@ -1,18 +1,24 @@
 ```mermaid
 sequenceDiagram
     participant M as Main
-    participant S as Select Statement
+    participant S as Sender(goroutine)
     participant C as Channel
-    participant T as Timer
-
-    M->>S: Start select
-    S->>C: Try receive
-    S->>T: Start timer
-    alt Channel receives value
-        C-->>S: Value received
-        S-->>M: Return value
-    else Timer expires
-        T-->>S: Timeout
-        S-->>M: Return timeout error
+    participant T as Time.After
+    
+    M->>S: Start sender goroutine
+    activate S
+    S-->>M: Return channel
+    
+    loop Until timeout
+        S->>C: Send message (i)
+        S->>S: Sleep random time
+        alt Message Available
+            C->>M: Receive message
+            M->>M: Print message
+        else 5s Timeout
+            T->>M: Timeout signal
+            M->>M: Print "no response"
+            M->>M: return
+        end
     end
 ```

06-select-timeout/main.go

@@ -1,5 +1,34 @@
 package main
 
+import (
+	"fmt"
+	"math/rand"
+	"time"
+)
+
+func sender(message string) <-chan string {
+	c := make(chan string)
+	go func() {
+		for i := 0; ; i++ {
+			c <- fmt.Sprintf("%s =  %d", message, i)
+			time.Sleep(time.Duration(rand.Intn(1000)) * time.Millisecond)
+		}
+	}()
+
+	return c
+}
+
 func main() {
+	c := sender("Test")
 
+	timeout := time.After(5 * time.Second)
+	for {
+		select {
+		case str := <-c:
+			fmt.Println(str)
+		case <-timeout:
+			fmt.Println("no response...")
+			return
+		}
+	}
 }