RegionSelector

public final class RegionSelector {

    private final Object lock = new Object();
    private final long sessionLifetime;
    private final Int2ObjectMap<SelectorSession> sessions;
    private final int borderBlock;
    private final Int2ObjectMap<Set<Vector3>> borders;
    private final Field interfaz;
    private final boolean async;

    @SuppressWarnings("unchecked")
    public RegionSelector(long sessionLifetime, Block borderBlock, boolean async) {
        this.sessions = new Int2ObjectArrayMap<>();
        this.borders = new Int2ObjectArrayMap<>();
        this.borders.defaultReturnValue(Collections.EMPTY_SET);
        this.sessionLifetime = sessionLifetime;
        this.borderBlock = GlobalBlockPalette.getOrCreateRuntimeId(borderBlock.getId(), borderBlock.getDamage());
        this.async = async;

        Field interfaz = null;
        if (async) {
            try {
                interfaz = Player.class.getDeclaredField("interfaz");
                interfaz.setAccessible(true);
            } catch (NoSuchFieldException | SecurityException ignore) {
            }
        }
        this.interfaz = interfaz;
    }