Add retry in templates to wait realtime notifications

test/templates/realtime.tpl.cpp

@@ -43,7 +43,7 @@ int main() {
 
   [snippet-code]
 
-  while (is_empty(&cout_copy)) {
+  for (size_t i = 20; i > 0 && is_empty(&cout_copy); --i) {
     usleep(200);
   }
 

test/templates/realtime.tpl.go

@@ -28,6 +28,11 @@ func main() {
 
 	[snippet-code]
 
+	go func() {
+		time.Sleep(4 * time.Second)
+		os.Exit(0)
+	}()
+
 	b := make([]byte, 4096)
 	n, _ := r.Read(b)
 

test/templates/realtime.tpl.java

@@ -18,7 +18,7 @@ public static void main(String[] args) {
 
       [snippet-code]
 
-      while (baos.size() == 0) {
+      for (int i = 20; i > 0 && baos.size() == 0; --i) {
         try {
           Thread.sleep(200);
         } catch (InterruptedException e) {

test/templates/realtime.tpl.js

@@ -31,9 +31,11 @@ function sleep (ms) {
   };
 
   [snippet-code] finally {
-    while (outputs.length <= 0) {
-      await sleep(200);
-    }
+    (async () => {
+      for (let i = 20; i > 0 && outputs.length <= 0; --i) {
+        await sleep(200);
+      }
+    })();
 
     console.log = consoleLog;
     console.log(...outputs);