private Selector selector;

public abstract class SelectorImpl extends AbstractSelector {    protected Set<SelectionKey> selectedKeys = new HashSet();    protected HashSet<SelectionKey> keys = new HashSet();    private Set<SelectionKey> publicKeys;    private Set<SelectionKey> publicSelectedKeys;

    protected SelectorImpl(SelectorProvider var1) {        super(var1);        if (Util.atBugLevel("1.4")) {            this.publicKeys = this.keys;            this.publicSelectedKeys = this.selectedKeys;        } else {            this.publicKeys = Collections.unmodifiableSet(this.keys);            this.publicSelectedKeys = Util.ungrowableSet(this.selectedKeys);        }    }}

NioEventLoop(NioEventLoopGroup parent, Executor executor, SelectorProvider selectorProvider,                 SelectStrategy strategy, RejectedExecutionHandler rejectedExecutionHandler) {            selector = openSelector();}

private SelectorTuple openSelector() {  final SelectedSelectionKeySet selectedKeySet = new SelectedSelectionKeySet();}

final class SelectedSelectionKeySet extends AbstractSet<SelectionKey> {

    SelectionKey[] keys;    int size;

    SelectedSelectionKeySet() {        keys = new SelectionKey[1024];    }

    @Override    public boolean add(SelectionKey o) {        if (o == null) {            return false;        }

        keys[size++] = o;        if (size == keys.length) {            increaseCapacity();        }

        return true;    }}

Field selectedKeysField = selectorImplClass.getDeclaredField("selectedKeys");Field publicSelectedKeysField = selectorImplClass.getDeclaredField("publicSelectedKeys");          
selectedKeysField.set(unwrappedSelector, selectedKeySet);publicSelectedKeysField.set(unwrappedSelector, selectedKeySet);