Class GetIconUtil

src/main/java/file/engine/utils/GetIconUtil.java:22–256

import java.util.function.Consumer;

@Slf4j
public class GetIconUtil {
    private static final int MAX_CONSUMER_THREAD_NUM = 4;
    private static final FileSystemView FILE_SYSTEM_VIEW = FileSystemView.getFileSystemView();
    private static final Task EMPTY_TASK = new Task(null, 0, 0);
    private final ConcurrentHashMap<String, ImageIcon> constantIconMap = new ConcurrentHashMap<>();
    private final SynchronousQueue<Task> workingQueue = new SynchronousQueue<>();
    private final ConcurrentHashMap<String, IconCache> cacheIconMap = new ConcurrentHashMap<>();

    private static volatile GetIconUtil INSTANCE = null;

    private record IconCache(
            long cacheCreateTime,
            ImageIcon icon
    ) {
    }

    private GetIconUtil() {
        initIconCache();
        startWorkingThread();
        clearIconCacheThread();
    }

    public static GetIconUtil getInstance() {
        if (INSTANCE == null) {
            synchronized (GetIconUtil.class) {
                if (INSTANCE == null) {
                    INSTANCE = new GetIconUtil();
                }
            }
        }
        return INSTANCE;
    }

    public ImageIcon changeIcon(ImageIcon icon, int width, int height) {
        if (icon == null) {
            return null;
        }
        Image image = icon.getImage().getScaledInstance(width, height, Image.SCALE_FAST);
        return new ImageIcon(image);
    }

    private void initIconCache() {
        constantIconMap.put("dllImageIcon", Objects.requireNonNull((ImageIcon) FILE_SYSTEM_VIEW.getSystemIcon(new File("user", "emptyRecycleBin.dll"))));
        constantIconMap.put("folderImageIcon", Objects.requireNonNull((ImageIcon) FILE_SYSTEM_VIEW.getSystemIcon(new File("user"))));
        constantIconMap.put("txtImageIcon", Objects.requireNonNull((ImageIcon) FILE_SYSTEM_VIEW.getSystemIcon(new File("user\\cmds.txt"))));
        constantIconMap.put("blankIcon", new ImageIcon(Objects.requireNonNull(GetIconUtil.class.getResource("/icons/blank.png"))));
        constantIconMap.put("recycleBin", new ImageIcon(Objects.requireNonNull(GetIconUtil.class.getResource("/icons/recyclebin.png"))));
        constantIconMap.put("updateIcon", new ImageIcon(Objects.requireNonNull(GetIconUtil.class.getResource("/icons/update.png"))));
        constantIconMap.put("helpIcon", new ImageIcon(Objects.requireNonNull(GetIconUtil.class.getResource("/icons/help.png"))));
        constantIconMap.put("completeIcon", new ImageIcon(Objects.requireNonNull(GetIconUtil.class.getResource("/icons/complete.png"))));
        constantIconMap.put("loadingIcon", new ImageIcon(Objects.requireNonNull(GetIconUtil.class.getResource("/icons/loading.gif"))));
    }

    public ImageIcon getCommandIcon(String commandName, int width, int height) {
        if (commandName == null || commandName.isEmpty()) {
            if (IsDebug.isDebug()) {
                log.warn("Command is empty");