Switch to an efficient pool of daemon threads instead of thread per websocket and sleeping!

Client/src/main/java/io/github/jwdeveloper/tiktok/websocket/TikTokWebSocketClient.java

@@ -142,7 +142,7 @@ public class TikTokWebSocketClient implements LiveSocketClient {
                 case 2 -> webSocketClient.closeConnection(CloseFrame.NORMAL, "");
                 default -> webSocketClient.close();
             }
-            heartbeatTask.stop();
+            heartbeatTask.stop(webSocketClient);
         }
         webSocketClient = null;
     }

Client/src/main/java/io/github/jwdeveloper/tiktok/websocket/WebSocketHeartbeatTask.java

@@ -24,41 +24,52 @@ package io.github.jwdeveloper.tiktok.websocket;
 
 import org.java_websocket.WebSocket;
 
-import java.util.Base64;
+import java.util.*;
+import java.util.concurrent.*;
 
 public class WebSocketHeartbeatTask
 {
-    private Thread thread;
-    private boolean isRunning = false;
-    private final int MAX_TIMEOUT = 250;
-    private final int SLEEP_TIME = 500;
+    // Single shared pool for all heartbeat tasks
+    private final ScheduledExecutorService scheduler = Executors.newScheduledThreadPool(1, r -> {
+        Thread t = new Thread(r, "heartbeat-pool");
+        t.setDaemon(true);
+        return t;
+    });
+    private final Map<WebSocket, ScheduledFuture<?>> tasks = new ConcurrentHashMap<>();
+    private final Map<WebSocket, Long> commTime = new ConcurrentHashMap<>();
+
     private final byte[] heartbeatBytes = Base64.getDecoder().decode("MgJwYjoCaGI="); // Used to be '3A026862' aka ':\x02hb', now is '2\x02pb:\x02hb'.
 
     public void run(WebSocket webSocket, long pingTaskTime) {
-        stop();
-        thread = new Thread(() -> heartbeatTask(webSocket, pingTaskTime), "heartbeat-task");
-        isRunning = true;
-        thread.start();
-    }
+        stop(webSocket); // remove existing task if any
 
-    public void stop() {
-        if (thread != null)
-            thread.interrupt();
-        isRunning = false;
-    }
-
-    private void heartbeatTask(WebSocket webSocket, long pingTaskTime) {
-        while (isRunning) {
+        tasks.put(webSocket, scheduler.scheduleAtFixedRate(() -> {
             try {
                 if (webSocket.isOpen()) {
                     webSocket.send(heartbeatBytes);
-                    Thread.sleep(pingTaskTime + (int) (Math.random() * MAX_TIMEOUT));
-                } else
-                    Thread.sleep(SLEEP_TIME);
+                    commTime.put(webSocket, System.currentTimeMillis());
+                } else {
+                    Long time = commTime.get(webSocket);
+                    if (time != null && System.currentTimeMillis() - time >= 60_000) // Stop if disconnected longer than 60s
+                        stop(webSocket);
+                }
             } catch (Exception e) {
-                //TODO we should display some kind of error message
-                isRunning = false;
+                e.printStackTrace();
+                stop(webSocket);
             }
-        }
+        }, 0, pingTaskTime, TimeUnit.MILLISECONDS));
+    }
+
+    public void stop(WebSocket webSocket) {
+        ScheduledFuture<?> future = tasks.remove(webSocket);
+        if (future != null)
+			future.cancel(true);
+        commTime.remove(webSocket);
+    }
+
+    public void shutdown() {
+        tasks.values().forEach(f -> f.cancel(true));
+        commTime.clear();
+        scheduler.shutdownNow();
     }
 }