ImageCache Class — netty Architecture

Source Code

example/src/main/java/io/netty/example/http2/tiles/ImageCache.java lines 31–62

public final class ImageCache {

    public static ImageCache INSTANCE = new ImageCache();

    private final Map<String, ByteBuf> imageBank = new HashMap<String, ByteBuf>(200);

    private ImageCache() {
        init();
    }

    public static String name(int x, int y) {
        return "tile-" + y + "-" + x + ".jpeg";
    }

    public ByteBuf image(int x, int y) {
        return imageBank.get(name(x, y));
    }

    private void init() {
        for (int y = 0; y < 10; y++) {
            for (int x = 0; x < 20; x++) {
                String name = name(x, y);
                try (InputStream resourceAsStream = getClass().getResourceAsStream(name)) {
                    ByteBuf fileBytes = unreleasableBuffer(toByteBuf(resourceAsStream).asReadOnly());
                    imageBank.put(name, fileBytes);
                } catch (IOException e) {
                    e.printStackTrace();
                }
            }
        }
    }
}