Added WSKeepAliveThread

Author: LatvianModder

src/main/java/dev/latvian/apps/tinyserver/ws/WSKeepAliveThread.java

@@ -0,0 +1,34 @@
+package dev.latvian.apps.tinyserver.ws;
+
+import dev.latvian.apps.tinyserver.HTTPServer;
+
+public class WSKeepAliveThread extends Thread {
+	public final HTTPServer<?> server;
+	public final WSHandler<?, ?> handler;
+
+	public WSKeepAliveThread(HTTPServer<?> server, WSHandler<?, ?> handler, String name) {
+		super("WSKeepAliveThread-" + name);
+		this.server = server;
+		this.handler = handler;
+		setDaemon(true);
+	}
+
+	@Override
+	public void run() {
+		while (server.isRunning()) {
+			try {
+				for (var session : handler) {
+					session.sendPing(new byte[0]);
+				}
+			} catch (Exception ex) {
+				ex.printStackTrace();
+			}
+
+			try {
+				Thread.sleep(10000L);
+			} catch (Exception ex) {
+				ex.printStackTrace();
+			}
+		}
+	}
+}