Another main point of this post is to show the different of loading data in various stage. There are three position in the code to load barchart data.
- At position A: call prepareMemInfo() to load barchart data in JavaFX Application Thread, before UI show.
- At position B, call prepareMemInfo() to load barchart data in JavaFX Application Thread, after UI show.
- At position C, start another thread to load barchart data.
In this case, another question rised: in prepareMemInfo(), the file /proc/meminfo is parsed in sequency, but add data to series2 in Application Thread by calling Platform.runLater(). May be it will not in the same sequency. <- I'm not sure here.
Check this video to know the different:
package javafx_meminfo; import java.io.IOException; import java.nio.file.Files; import java.nio.file.Path; import java.nio.file.Paths; import java.util.logging.Level; import java.util.logging.Logger; import java.util.stream.Stream; import javafx.application.Application; import javafx.application.Platform; import javafx.beans.property.SimpleFloatProperty; import javafx.beans.property.SimpleIntegerProperty; import javafx.beans.property.SimpleStringProperty; import javafx.collections.FXCollections; import javafx.collections.ObservableList; import javafx.concurrent.Task; import javafx.scene.Scene; import javafx.scene.chart.BarChart; import javafx.scene.chart.CategoryAxis; import javafx.scene.chart.NumberAxis; import javafx.scene.chart.XYChart; import javafx.scene.control.ProgressBar; import javafx.scene.control.TableColumn; import javafx.scene.control.TableView; import javafx.scene.control.cell.PropertyValueFactory; import javafx.scene.layout.StackPane; import javafx.scene.layout.VBox; import javafx.stage.Stage; /** * * @web http://java-buddy.blogspot.com/ */ public class JavaFX_meminfo extends Application { final static String FILE_MEMINFO = "/proc/meminfo"; private final TableView<Record> tableMem = new TableView<>(); ObservableList<Record> listRecords = FXCollections.observableArrayList(); XYChart.Series series1 = new XYChart.Series(); //load in Application Thread XYChart.Series series2 = new XYChart.Series(); //load in Background Thread final CategoryAxis xAxis = new CategoryAxis(); final NumberAxis yAxis = new NumberAxis(); final BarChart<String, Number> barChart = new BarChart<>(xAxis, yAxis); @Override public void start(Stage primaryStage) { //position A - run in UI Thread, before UI show //prepareMemInfo(); tableMem.setEditable(false); TableColumn colMemField = new TableColumn("Field"); colMemField.setMinWidth(150); colMemField.setCellValueFactory( new PropertyValueFactory<>("memField")); TableColumn colMemValue = new TableColumn("Value"); colMemValue.setMinWidth(100); colMemValue.setCellValueFactory( new PropertyValueFactory<>("memValue")); TableColumn colMemUnit = new TableColumn("Unit"); colMemUnit.setMinWidth(50); colMemUnit.setCellValueFactory( new PropertyValueFactory<>("memUnit")); TableColumn colMemQty = new TableColumn("Qty"); colMemQty.setMinWidth(200); colMemQty.setCellValueFactory( new PropertyValueFactory<>("memQty")); tableMem.setItems(listRecords); tableMem.getColumns().addAll(colMemField, colMemValue, colMemUnit, colMemQty); //Create a dummy ProgressBar running ProgressTask progressTask = new ProgressTask(); ProgressBar progressBar = new ProgressBar(); progressBar.setProgress(0); progressBar.progressProperty().bind(progressTask.progressProperty()); new Thread(progressTask).start(); //--- VBox vBox = new VBox(); vBox.getChildren().addAll(tableMem, progressBar); StackPane root = new StackPane(); root.getChildren().add(vBox); Scene scene = new Scene(root, 500, 250); primaryStage.setTitle("java-buddy"); primaryStage.setScene(scene); primaryStage.show(); //Open second window barChart.setTitle(FILE_MEMINFO); xAxis.setLabel("Field"); yAxis.setLabel("Qty"); barChart.getData().addAll(series1, series2); StackPane secondaryLayout = new StackPane(); secondaryLayout.getChildren().add(barChart); Scene secondScene = new Scene(secondaryLayout, 500, 400); Stage secondStage = new Stage(); secondStage.setTitle("Second Stage"); secondStage.setScene(secondScene); //Set position of second window, related to primary window. secondStage.setX(primaryStage.getX() + 250); secondStage.setY(primaryStage.getY() + 20); secondStage.show(); //position B - run in UI Thread, after UI show //prepareMemInfo(); //position C - run in background Thread new Thread(BackgroundPrepareMemoInfo).start(); } public static void main(String[] args) { launch(args); } Runnable BackgroundPrepareMemoInfo = () -> { prepareMemInfo(); }; private void prepareMemInfo() { //dummy delay try { Thread.sleep(1000); } catch (InterruptedException ex) { Logger.getLogger(JavaFX_meminfo.class.getName()).log(Level.SEVERE, null, ex); } Stream<String> streamMemInfo = readFile(FILE_MEMINFO); streamMemInfo.forEach((line) -> { System.out.println(line); //split one line by whitespace/grouped whitespaces String[] oneLine = line.split("\\s+"); for (String ele : oneLine) { System.out.println(ele); } System.out.println("---"); String rField = ""; int rMemValue = 0; String rMemUnit = ""; if (oneLine.length <= 3) { if (oneLine.length == 3) { rField = oneLine[0]; rMemValue = Integer.parseInt(oneLine[1]); rMemUnit = oneLine[2]; } else if (oneLine.length == 2) { rField = oneLine[0]; rMemValue = Integer.parseInt(oneLine[1]); rMemUnit = "B"; } else if (oneLine.length == 1) { rField = oneLine[0]; rMemValue = 0; rMemUnit = "B"; } Record record = new Record( rField, rMemValue, rMemUnit); listRecords.add(record); if (Platform.isFxApplicationThread()) { //It's running in UI Thread series1.getData().add(new XYChart.Data(record.getMemField(), record.getMemQty())); } else { //It's running in background Thread Platform.runLater(() -> { series2.getData().add(new XYChart.Data(record.getMemField(), record.getMemQty())); }); } } }); } private Stream<String> readFile(String filePath) { Path path = Paths.get(filePath); Stream<String> fileLines = null; try { fileLines = Files.lines(path); } catch (IOException ex) { Logger.getLogger(JavaFX_meminfo.class.getName()).log(Level.SEVERE, null, ex); } return fileLines; } public static class Record { private final SimpleStringProperty memField; private final SimpleIntegerProperty memValue; private final SimpleStringProperty memUnit; private final SimpleFloatProperty memQty; private Record(String memField, int memValue, String memUnit) { this.memField = new SimpleStringProperty(memField); this.memValue = new SimpleIntegerProperty(memValue); this.memUnit = new SimpleStringProperty(memUnit); if (memValue == 0) { this.memQty = new SimpleFloatProperty(0.0f); } else if (memUnit.equalsIgnoreCase("MB")) { this.memQty = new SimpleFloatProperty((float) memValue * 1000000.0f); } else if (memUnit.equalsIgnoreCase("kB")) { this.memQty = new SimpleFloatProperty((float) memValue * 1000.0f); } else { this.memQty = new SimpleFloatProperty((float) memValue); } } public String getMemField() { return memField.get(); } public int getMemValue() { return memValue.get(); } public String getMemUnit() { return memUnit.get(); } public float getMemQty() { return memQty.get(); } } final int MAX_PROGRESS = 50; class ProgressTask extends Task<Void>{ @Override protected Void call() throws Exception { for (int i = 1; i <= MAX_PROGRESS; i++) { updateProgress(i, MAX_PROGRESS); Thread.sleep(200); } return null; } } }
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