使用简单的自定义日志框架通过线程将消息记录到JavaFXTextArea的最有效方法

我有一个简单的自定义日志框架，如下所示：

package something;

import javafx.scene.control.TextArea;

public class MyLogger {
    public final TextArea textArea;

    private boolean verboseMode = false;
    private boolean debugMode = false;

    public MyLogger(final TextArea textArea) {
        this.textArea = textArea;
    }

    public MyLogger setVerboseMode(boolean value) {
        verboseMode = value;
        return this;
    }

    public MyLogger setDebugMode(boolean value) {
        debugMode = value;
        return this;
    }

    public boolean writeMessage(String msg) {
        textArea.appendText(msg);
        return true;
    }

    public boolean logMessage(String msg) {
        return writeMessage(msg + "\n");
    }

    public boolean logWarning(String msg) {
        return writeMessage("Warning: " + msg + "\n");
    }

    public boolean logError(String msg) {
        return writeMessage("Error: " + msg + "\n");
    }

    public boolean logVerbose(String msg) {
        return verboseMode ? writeMessage(msg + "\n") : true;
    }

    public boolean logDebug(String msg) {
        return debugMode ? writeMessage("[DEBUG] " + msg + "\n") : true;
    }
}

现在我想做的是扩展它，以便它能够通过线程正确地处理消息日志记录。我尝试过这样的解决方案。它可以工作，但会减慢GUI的速度

我还尝试使用一个线程，该线程运行一个线程，从消息队列读取消息，将它们连接起来，并将它们附加到TextArea（

TextArea.appendText（stringBuilder.toString（））

）。问题是TextArea控件不稳定，即您必须使用

Ctrl-A

突出显示所有文本，并尝试调整窗口大小以使其显示良好。还有一些显示在浅蓝色背景中，不确定是什么原因造成的。我的第一个猜测是，竞争条件可能不允许控件根据新字符串很好地更新自身。还值得注意的是，textarea被包装在滚动窗格中，因此如果textarea实际上是有问题的那一个或滚动窗格，则会增加混淆。我还必须提到的是，这种方法不能使TextArea控件用消息快速更新自身

我曾考虑将

绑定到执行更新的某个对象，但我不确定如何正确地做到这一点，因为我知道消息收集程序（无论是通过服务还是单个线程）的运行方式与GUI线程不同

我曾尝试查找其他已知的日志框架解决方案，如log4j和一些参考资料，但它们似乎都没有提供一种通过线程到TextArea进行日志记录的明显方法。我也不喜欢在它们上面构建日志系统，因为它们已经有了预定义的机制，比如日志级别等

我也见过。这意味着使用
SwingUtilities.invokeLater（Runnable）
来更新控件，但我已经尝试了类似的方法，使用
javafx.application.platform.runLater（）
在工作线程上执行。我不确定我是否做错了什么，但它只是挂断了。它可以产生信息，但当它们足够具有攻击性时就不能。我估计，以纯同步方式运行的工作线程在调试模式下，平均每秒可以产生大约20行或更多行。一个可能的解决方法是将消息队列也添加到其中，但这不再有意义。
log-view.css

LogViewer.java

导入javafx.animation.animation；
导入javafx.animation.KeyFrame；
导入javafx.animation.Timeline；
导入javafx.application.application；
导入javafx.beans.binding.Bindings；
导入javafx.beans.property.*；
导入javafx.collections.FXCollections；
导入javafx.collections.ObservableList；
导入javafx.collections.transformation.FilteredList；
导入javafx.css.pseudo类；
导入javafx.geometry.Pos；
导入javafx.scene.scene；
导入javafx.scene.control.*；
导入javafx.scene.layout.HBox；
导入javafx.scene.layout.Priority；
导入javafx.scene.layout.VBox；
导入javafx.stage.stage；
导入javafx.util.Duration；
导入java.text.simpleDataFormat；
导入java.util.Collection；
导入java.util.Date；
导入java.util.Random；
导入java.util.concurrent.BlockingDeque；
导入java.util.concurrent.LinkedBlockingDeque；
类日志{
私有静态最终int MAX_LOG_条目=1_000_000；
private final BlockingDeque log=新的LinkedBlockingDeque（最大日志项）；
公共空白DRAITO（收藏不使用文本，使用虚拟化控件，也就是，@宝石海谢谢，我可以考虑。ListVIEW的布局可以配置为看起来像TeTaTra？真的令人印象深刻…
.root {
    -fx-padding: 10px;
}

.log-view .list-cell {
    -fx-background-color: null; // removes alternating list gray cells.
}

.log-view .list-cell:debug {
    -fx-text-fill: gray;
}

.log-view .list-cell:info {
    -fx-text-fill: green;
}

.log-view .list-cell:warn {
    -fx-text-fill: purple;
}

.log-view .list-cell:error {
    -fx-text-fill: red;
}

import javafx.animation.Animation;
import javafx.animation.KeyFrame;
import javafx.animation.Timeline;
import javafx.application.Application;
import javafx.beans.binding.Bindings;
import javafx.beans.property.*;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.collections.transformation.FilteredList;
import javafx.css.PseudoClass;
import javafx.geometry.Pos;
import javafx.scene.Scene;
import javafx.scene.control.*;
import javafx.scene.layout.HBox;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
import javafx.util.Duration;

import java.text.SimpleDateFormat;
import java.util.Collection;
import java.util.Date;
import java.util.Random;
import java.util.concurrent.BlockingDeque;
import java.util.concurrent.LinkedBlockingDeque;

class Log {
    private static final int MAX_LOG_ENTRIES = 1_000_000;

    private final BlockingDeque<LogRecord> log = new LinkedBlockingDeque<>(MAX_LOG_ENTRIES);

    public void drainTo(Collection<? super LogRecord> collection) {
        log.drainTo(collection);
    }

    public void offer(LogRecord record) {
        log.offer(record);
    }
}

class Logger {
    private final Log log;
    private final String context;

    public Logger(Log log, String context) {
        this.log = log;
        this.context = context;
    }

    public void log(LogRecord record) {
        log.offer(record);
    }

    public void debug(String msg) {
        log(new LogRecord(Level.DEBUG, context, msg));
    }

    public void info(String msg) {
        log(new LogRecord(Level.INFO, context, msg));
    }

    public void warn(String msg) {
        log(new LogRecord(Level.WARN, context, msg));
    }

    public void error(String msg) {
        log(new LogRecord(Level.ERROR, context, msg));
    }

    public Log getLog() {
        return log;
    }
}

enum Level { DEBUG, INFO, WARN, ERROR }

class LogRecord {
    private Date   timestamp;
    private Level  level;
    private String context;
    private String message;

    public LogRecord(Level level, String context, String message) {
        this.timestamp = new Date();
        this.level     = level;
        this.context   = context;
        this.message   = message;
    }

    public Date getTimestamp() {
        return timestamp;
    }

    public Level getLevel() {
        return level;
    }

    public String getContext() {
        return context;
    }

    public String getMessage() {
        return message;
    }
}

class LogView extends ListView<LogRecord> {
    private static final int MAX_ENTRIES = 10_000;

    private final static PseudoClass debug = PseudoClass.getPseudoClass("debug");
    private final static PseudoClass info  = PseudoClass.getPseudoClass("info");
    private final static PseudoClass warn  = PseudoClass.getPseudoClass("warn");
    private final static PseudoClass error = PseudoClass.getPseudoClass("error");

    private final static SimpleDateFormat timestampFormatter = new SimpleDateFormat("HH:mm:ss.SSS");

    private final BooleanProperty       showTimestamp = new SimpleBooleanProperty(false);
    private final ObjectProperty<Level> filterLevel   = new SimpleObjectProperty<>(null);
    private final BooleanProperty       tail          = new SimpleBooleanProperty(false);
    private final BooleanProperty       paused        = new SimpleBooleanProperty(false);
    private final DoubleProperty        refreshRate   = new SimpleDoubleProperty(60);

    private final ObservableList<LogRecord> logItems = FXCollections.observableArrayList();

    public BooleanProperty showTimeStampProperty() {
        return showTimestamp;
    }

    public ObjectProperty<Level> filterLevelProperty() {
        return filterLevel;
    }

    public BooleanProperty tailProperty() {
        return tail;
    }

    public BooleanProperty pausedProperty() {
        return paused;
    }

    public DoubleProperty refreshRateProperty() {
        return refreshRate;
    }

    public LogView(Logger logger) {
        getStyleClass().add("log-view");

        Timeline logTransfer = new Timeline(
                new KeyFrame(
                        Duration.seconds(1),
                        event -> {
                            logger.getLog().drainTo(logItems);

                            if (logItems.size() > MAX_ENTRIES) {
                                logItems.remove(0, logItems.size() - MAX_ENTRIES);
                            }

                            if (tail.get()) {
                                scrollTo(logItems.size());
                            }
                        }
                )
        );
        logTransfer.setCycleCount(Timeline.INDEFINITE);
        logTransfer.rateProperty().bind(refreshRateProperty());

        this.pausedProperty().addListener((observable, oldValue, newValue) -> {
            if (newValue && logTransfer.getStatus() == Animation.Status.RUNNING) {
                logTransfer.pause();
            }

            if (!newValue && logTransfer.getStatus() == Animation.Status.PAUSED && getParent() != null) {
                logTransfer.play();
            }
        });

        this.parentProperty().addListener((observable, oldValue, newValue) -> {
            if (newValue == null) {
                logTransfer.pause();
            } else {
                if (!paused.get()) {
                    logTransfer.play();
                }
            }
        });

        filterLevel.addListener((observable, oldValue, newValue) -> {
            setItems(
                    new FilteredList<LogRecord>(
                            logItems,
                            logRecord ->
                                logRecord.getLevel().ordinal() >=
                                filterLevel.get().ordinal()
                    )
            );
        });
        filterLevel.set(Level.DEBUG);

        setCellFactory(param -> new ListCell<LogRecord>() {
            {
                showTimestamp.addListener(observable -> updateItem(this.getItem(), this.isEmpty()));
            }

            @Override
            protected void updateItem(LogRecord item, boolean empty) {
                super.updateItem(item, empty);

                pseudoClassStateChanged(debug, false);
                pseudoClassStateChanged(info, false);
                pseudoClassStateChanged(warn, false);
                pseudoClassStateChanged(error, false);

                if (item == null || empty) {
                    setText(null);
                    return;
                }

                String context =
                        (item.getContext() == null)
                                ? ""
                                : item.getContext() + " ";

                if (showTimestamp.get()) {
                    String timestamp =
                            (item.getTimestamp() == null)
                                    ? ""
                                    : timestampFormatter.format(item.getTimestamp()) + " ";
                    setText(timestamp + context + item.getMessage());
                } else {
                    setText(context + item.getMessage());
                }

                switch (item.getLevel()) {
                    case DEBUG:
                        pseudoClassStateChanged(debug, true);
                        break;

                    case INFO:
                        pseudoClassStateChanged(info, true);
                        break;

                    case WARN:
                        pseudoClassStateChanged(warn, true);
                        break;

                    case ERROR:
                        pseudoClassStateChanged(error, true);
                        break;
                }
            }
        });
    }
}

class Lorem {
    private static final String[] IPSUM = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Quisque hendrerit imperdiet mi quis convallis. Pellentesque fringilla imperdiet libero, quis hendrerit lacus mollis et. Maecenas porttitor id urna id mollis. Suspendisse potenti. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Cras lacus tellus, semper hendrerit arcu quis, auctor suscipit ipsum. Vestibulum venenatis ante et nulla commodo, ac ultricies purus fringilla. Aliquam lectus urna, commodo eu quam a, dapibus bibendum nisl. Aliquam blandit a nibh tincidunt aliquam. In tellus lorem, rhoncus eu magna id, ullamcorper dictum tellus. Curabitur luctus, justo a sodales gravida, purus sem iaculis est, eu ornare turpis urna vitae dolor. Nulla facilisi. Proin mattis dignissim diam, id pellentesque sem bibendum sed. Donec venenatis dolor neque, ut luctus odio elementum eget. Nunc sed orci ligula. Aliquam erat volutpat.".split(" ");
    private static final int MSG_WORDS = 8;
    private int idx = 0;

    private Random random = new Random(42);

    synchronized public String nextString() {
        int end = Math.min(idx + MSG_WORDS, IPSUM.length);

        StringBuilder result = new StringBuilder();
        for (int i = idx; i < end; i++) {
            result.append(IPSUM[i]).append(" ");
        }

        idx += MSG_WORDS;
        idx = idx % IPSUM.length;

        return result.toString();
    }

    synchronized public Level nextLevel() {
        double v = random.nextDouble();

        if (v < 0.8) {
            return Level.DEBUG;
        }

        if (v < 0.95) {
            return Level.INFO;
        }

        if (v < 0.985) {
            return Level.WARN;
        }

        return Level.ERROR;
    }

}

public class LogViewer extends Application {
    private final Random random = new Random(42);

    @Override
    public void start(Stage stage) throws Exception {
        Lorem  lorem  = new Lorem();
        Log    log    = new Log();
        Logger logger = new Logger(log, "main");

        logger.info("Hello");
        logger.warn("Don't pick up alien hitchhickers");

        for (int x = 0; x < 20; x++) {
            Thread generatorThread = new Thread(
                    () -> {
                        for (;;) {
                            logger.log(
                                    new LogRecord(
                                            lorem.nextLevel(),
                                            Thread.currentThread().getName(),
                                            lorem.nextString()
                                    )
                            );

                            try {
                                Thread.sleep(random.nextInt(1_000));
                            } catch (InterruptedException e) {
                                Thread.currentThread().interrupt();
                            }
                        }
                    },
                    "log-gen-" + x
            );
            generatorThread.setDaemon(true);
            generatorThread.start();
        }

        LogView logView = new LogView(logger);
        logView.setPrefWidth(400);

        ChoiceBox<Level> filterLevel = new ChoiceBox<>(
                FXCollections.observableArrayList(
                        Level.values()
                )
        );
        filterLevel.getSelectionModel().select(Level.DEBUG);
        logView.filterLevelProperty().bind(
                filterLevel.getSelectionModel().selectedItemProperty()
        );

        ToggleButton showTimestamp = new ToggleButton("Show Timestamp");
        logView.showTimeStampProperty().bind(showTimestamp.selectedProperty());

        ToggleButton tail = new ToggleButton("Tail");
        logView.tailProperty().bind(tail.selectedProperty());

        ToggleButton pause = new ToggleButton("Pause");
        logView.pausedProperty().bind(pause.selectedProperty());

        Slider rate = new Slider(0.1, 60, 60);
        logView.refreshRateProperty().bind(rate.valueProperty());
        Label rateLabel = new Label();
        rateLabel.textProperty().bind(Bindings.format("Update: %.2f fps", rate.valueProperty()));
        rateLabel.setStyle("-fx-font-family: monospace;");
        VBox rateLayout = new VBox(rate, rateLabel);
        rateLayout.setAlignment(Pos.CENTER);

        HBox controls = new HBox(
                10,
                filterLevel,
                showTimestamp,
                tail,
                pause,
                rateLayout
        );
        controls.setMinHeight(HBox.USE_PREF_SIZE);

        VBox layout = new VBox(
                10,
                controls,
                logView
        );
        VBox.setVgrow(logView, Priority.ALWAYS);

        Scene scene = new Scene(layout);
        scene.getStylesheets().add(
            this.getClass().getResource("log-view.css").toExternalForm()
        );
        stage.setScene(scene);
        stage.show();
    }

    public static void main(String[] args) {
        launch(args);
    }
}