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. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org