reiern70 commented on a change in pull request #469:
URL: https://github.com/apache/wicket/pull/469#discussion_r636070852



##########
File path: 
wicket-examples/src/main/java/org/apache/wicket/examples/websocket/progress/ProgressUpdater.java
##########
@@ -0,0 +1,155 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.wicket.examples.websocket.progress;
+
+import java.io.Serializable;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+
+import org.apache.wicket.Application;
+import org.apache.wicket.protocol.ws.WebSocketSettings;
+import org.apache.wicket.protocol.ws.api.IWebSocketConnection;
+import org.apache.wicket.protocol.ws.api.WebSocketPushBroadcaster;
+import org.apache.wicket.protocol.ws.api.message.ConnectedMessage;
+import org.apache.wicket.protocol.ws.api.message.IWebSocketPushMessage;
+import org.apache.wicket.protocol.ws.api.registry.IKey;
+import org.apache.wicket.protocol.ws.api.registry.IWebSocketConnectionRegistry;
+
+/**
+ * A helper class that uses the web connection to push components updates to 
the client.
+ */
+public class ProgressUpdater
+{
+       public static ProgressUpdateTask start(ConnectedMessage message, 
ScheduledExecutorService scheduledExecutorService)
+       {
+               // create an asynchronous task that will write the data to the 
client
+               ProgressUpdateTask progressUpdateTask = new 
ProgressUpdateTask(message.getApplication(), message.getSessionId(), 
message.getKey());
+        scheduledExecutorService.schedule(progressUpdateTask, 1, 
TimeUnit.SECONDS);
+               return progressUpdateTask;
+       }
+
+       public static void restart(ProgressUpdateTask progressUpdateTask, 
ScheduledExecutorService scheduledExecutorService) {
+               scheduledExecutorService.schedule(progressUpdateTask, 1, 
TimeUnit.SECONDS);
+       }
+
+       /**
+        * A push message used to update progress.
+        */
+       public static class ProgressUpdate implements IWebSocketPushMessage
+       {
+
+               private final int progress;
+
+               public ProgressUpdate(int progress)
+               {
+                       this.progress = progress;
+               }
+
+               public int getProgress()
+               {
+                       return progress;
+               }
+       }
+
+       /**
+        * A task that sends data to the client by pushing it to the web socket 
connection
+        */
+       public static class ProgressUpdateTask implements Runnable, Serializable
+       {
+               /**
+                * The following fields are needed to be able to lookup the 
IWebSocketConnection from
+                * IWebSocketConnectionRegistry
+                */
+               private final String applicationName;
+               private final String sessionId;
+               private final IKey key;
+
+               private boolean canceled = false;
+               private boolean running = false;
+
+               private ProgressUpdateTask(Application application, String 
sessionId, IKey key)
+               {
+                       this.applicationName = application.getName();
+                       this.sessionId = sessionId;
+                       this.key = key;
+               }
+
+               @Override
+               public void run()
+               {
+                       running = true;
+                       Application application = 
Application.get(applicationName);
+                       WebSocketSettings webSocketSettings = 
WebSocketSettings.Holder.get(application);
+                       IWebSocketConnectionRegistry 
webSocketConnectionRegistry = webSocketSettings.getConnectionRegistry();
+
+                       int progress = 0;
+
+                       while (progress <= 100)
+                       {
+                               IWebSocketConnection connection = 
webSocketConnectionRegistry.getConnection(application, sessionId, key);
+                               try
+                               {
+                                       if (connection == null || 
!connection.isOpen())
+                                       {
+                                               running = false;
+                                               // stop if the web socket 
connection is closed
+                                               return;
+                                       }
+
+                                       if (canceled)
+                                       {
+                                               canceled = false;
+                                               running = false;
+                                               return;
+                                       }
+
+                                       WebSocketPushBroadcaster broadcaster =
+                                                       new 
WebSocketPushBroadcaster(webSocketSettings.getConnectionRegistry());
+                                       broadcaster.broadcast(new 
ConnectedMessage(application, sessionId, key), new ProgressUpdate(progress));
+
+                                       // sleep for a while to simulate work
+                                       TimeUnit.SECONDS.sleep(1);
+                                       progress++;
+                               }
+                               catch (InterruptedException x)
+                               {
+                                       Thread.currentThread().interrupt();
+                                       break;
+                               }
+                               catch (Exception e)
+                               {
+                                       e.printStackTrace();

Review comment:
       Copy and paste from ChartUdater. I will fix.




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