MRefresh | pod enables you to add pull | iOS library

private static PublishSubject mPublishSubject;
private static AtomicBoolean mRefreshing = new AtomicBoolean(false);
private static Observable mTokenObservable;

public Observable getNetTokenLocked() {
    if (mRefreshing.compareAndSet(false, true)) {
        Log.e(TAG, "first    request");
        mTokenObservable.subscribe(mPublishSubject);
    } else {
        Log.e(TAG, "else  wait back");
    }
    return mPublishSubject;                         //second didn't return  
}