Java tutorial
/* * 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.tamaya.examples.distributed; import io.vertx.core.Vertx; import io.vertx.core.VertxOptions; import io.vertx.core.json.Json; import io.vertx.core.spi.cluster.ClusterManager; import io.vertx.spi.cluster.hazelcast.HazelcastClusterManager; import javafx.application.Application; import javafx.application.Platform; import javafx.scene.Group; import javafx.scene.Node; import javafx.scene.Scene; import javafx.scene.layout.BorderPane; import javafx.scene.layout.HBox; import javafx.scene.layout.Pane; import javafx.scene.layout.VBox; import javafx.scene.paint.Color; import javafx.stage.Stage; import org.apache.tamaya.spisupport.propertysource.EnvironmentPropertySource; import org.apache.tamaya.spisupport.propertysource.SystemPropertySource; import org.apache.tamaya.functions.ConfigurationFunctions; import org.apache.tamaya.hazelcast.HazelcastPropertySource; import org.apache.tamaya.inject.ConfigurationInjection; import org.apache.tamaya.inject.api.Config; import java.time.LocalDateTime; import java.util.logging.Logger; import javafx.scene.control.Button; import javafx.scene.control.Label; import javafx.scene.control.ScrollPane; import javafx.scene.control.Tab; import javafx.scene.control.TabPane; import javafx.scene.control.TextArea; import javafx.scene.control.TextField; import org.apache.tamaya.Configuration; import org.apache.tamaya.spi.ConfigurationBuilder; /** * Created by atsticks on 12.11.16. */ public class Display extends Application { private static final Logger LOG = Logger.getLogger(Display.class.getSimpleName()); public static final String DISPLAY_SHOW_TOPIC = "Display::show"; public static final String DISPLAY_REGISTER_TOPIC = "Display::register"; public static final String CONTENT_FIELD = "content"; @Config(defaultValue = "UNKNOWN DISPLAY") private String displayName; private Scene scene; private Group root = new Group(); private Stage stage; private TextField titleField = new TextField("title"); private TextField configFilterField = new TextField(""); private TextArea contentField = new TextArea("scene"); private TextArea monitorField = new TextArea("monitor"); private DisplayContent displayContent = new DisplayContent(); private DisplayRegistration registration; private StringBuffer monitorBuffer = new StringBuffer(); private Vertx vertx; private static HazelcastPropertySource hazelCastPropertySource; public Display() { LOG.info("\n-----------------------------------\n" + "Starting Display...\n" + "-----------------------------------"); LOG.info("--- Starting Vertx cluster..."); // Reusing the hazelcast instance already in place for vertx... ClusterManager mgr = new HazelcastClusterManager(hazelCastPropertySource.getHazelcastInstance()); VertxOptions vertxOptions = new VertxOptions().setClusterManager(mgr); Vertx.clusteredVertx(vertxOptions, h -> { vertx = h.result(); }); LOG.info("--- Waiting for Vertx cluster..."); while (vertx == null) { try { Thread.sleep(100L); } catch (InterruptedException e) { LOG.severe("Vertx cluster did not respond in time."); Thread.currentThread().interrupt(); } } titleField.getStyleClass().add("title"); contentField.getStyleClass().add("content"); monitorField.getStyleClass().add("monitor"); titleField.setId("title"); titleField.setEditable(false); contentField.setId("scene"); contentField.setEditable(false); } @Override public void start(Stage stage) throws Exception { this.stage = stage; LOG.info("--- Configuring application..."); ConfigurationInjection.getConfigurationInjector().configure(this); LOG.info("--- Registering display..."); registerDisplay(); LOG.info("--- Starting stage..."); initStage(stage); registerListeners(); LOG.info("--- Showing stage..."); stage.show(); LOG.info("\n---------------\n" + "Display started\n" + "---------------"); } private void registerDisplay() { registration = new DisplayRegistration(displayName); logToMonitor("Display started at " + LocalDateTime.now() + "\n id = " + registration.getId() + "\n name = " + registration.getDisplayName()); // Register in the shared map every 10 seconds, with a TTL of 20 seconds... vertx.eventBus().publish(DISPLAY_REGISTER_TOPIC, Json.encode(registration)); vertx.periodicStream(10000).handler(time -> { registration = registration.update(); vertx.eventBus().publish(DISPLAY_REGISTER_TOPIC, Json.encode(registration)); vertx.sharedData().getClusterWideMap("displays", h -> { h.result().put(registration.getId(), registration, 20000L, null); }); }); } private void registerListeners() { // registering update hook vertx.eventBus().consumer(DISPLAY_SHOW_TOPIC, h -> { DisplayContent content = Json.decodeValue((String) h.body(), DisplayContent.class); logToMonitor("NEW CONTENT: " + content.toString()); if (registration.getId().equals(content.getDisplayId())) { logToMonitor("Applying content: " + content + "..."); titleField.setText(content.getTitle()); contentField.setText(content.getContent().get(CONTENT_FIELD)); if (content.getDisplayName() != null) { this.registration.setDisplayName(content.getDisplayName()); Platform.runLater(() -> { this.stage.setTitle(content.getDisplayName()); }); } logToMonitor("SUCCESS."); } }); vertx.eventBus().consumer(DISPLAY_REGISTER_TOPIC, h -> { DisplayRegistration thisRegistration = Json.decodeValue((String) h.body(), DisplayRegistration.class); logToMonitor("NEW DISPLAY: " + thisRegistration.toString()); }); } private void initStage(Stage stage) { stage.setTitle(registration.getDisplayName()); scene = new Scene(root, Color.WHITE); scene.getStylesheets().add("/stylesheet.css"); BorderPane layout = new BorderPane(); layout.getStyleClass().add("main-layout"); layout.setPrefSize(600, 400); // layout.setTop(createWinTitle()); Node displayPanel = createDisplayNode(); Node monitorPanel = createMonitorNode(); TabPane tabPane = new TabPane(); tabPane.getStylesheets().add("main-tabs"); Tab tab0 = new Tab("Display", displayPanel); tab0.setClosable(false); Tab tab1 = new Tab("Monitor", monitorPanel); tab1.setClosable(false); tabPane.getTabs().add(0, tab0); tabPane.getTabs().add(1, tab1); layout.setCenter(tabPane); layout.setBottom(createStatusPane()); scene.setRoot(layout); stage.setScene(scene); } private Node createStatusPane() { return new Label(); } private Node createMonitorNode() { VBox vbox = new VBox(); ScrollPane monitorPane = new ScrollPane(monitorField); monitorPane.setFitToHeight(true); monitorPane.setFitToWidth(true); monitorField.setPrefSize(2000, 2000); vbox.getChildren().addAll(monitorPane); return vbox; } private Node createDisplayNode() { VBox vbox = new VBox(); ScrollPane contentPane = new ScrollPane(contentField); contentPane.setFitToHeight(true); contentPane.setFitToWidth(true); titleField.setText("- Nothing to show -"); contentField.setText("- Nothing to show -"); vbox.getChildren().addAll(titleField, contentPane, createButtonPane()); return vbox; } private Pane createButtonPane() { HBox buttonLayout = new HBox(); buttonLayout.getStyleClass().add("button-pane"); Button showConfig = new Button("Show Config"); showConfig.setId("showConfig-button"); showConfig.onActionProperty().set(h -> { if ("Hide Config".equals(showConfig.getText())) { monitorField.setText(monitorBuffer.toString()); showConfig.setText("Show Config"); } else { showConfig(); showConfig.setText("Hide Config"); } }); configFilterField.onActionProperty().set(h -> { showConfig(); }); configFilterField.setId("configFilter-field"); buttonLayout.getChildren().addAll(showConfig, configFilterField); return buttonLayout; } private void showConfig() { String filter = configFilterField.getText(); String configAsText; if (filter != null && !filter.trim().isEmpty()) { configAsText = Configuration.current().map(ConfigurationFunctions.section(filter)) .adapt(ConfigurationFunctions.textInfo()); } else { configAsText = Configuration.current().adapt(ConfigurationFunctions.textInfo()); } monitorField.setText(configAsText); } public static void main(String[] args) { // Programmatically setup our configuration hazelCastPropertySource = new HazelcastPropertySource(); Configuration cfg = Configuration.current(); ConfigurationBuilder builder = Configuration.createConfigurationBuilder().setConfiguration(cfg); Configuration built = builder.addPropertySources(new EnvironmentPropertySource(), new SystemPropertySource(), hazelCastPropertySource).addDefaultPropertyConverters().build(); Configuration.setCurrent(built); // Launch the app Application.launch(Display.class); } public void logToMonitor(String message) { if (!message.endsWith("\n")) { monitorBuffer.append(message + '\n'); } else { monitorBuffer.append(message); } synchronized (monitorField) { monitorField.setText(monitorBuffer.toString()); } } }