class CustomEventBannerAdapter implements CustomEventBannerListener {

    @Override
    public void onBannerFailed(MoPubErrorCode errorCode) {
        if (isInvalidated()) return;
        
        if (mMoPubView != null) {
            if (errorCode == null) {
                errorCode = UNSPECIFIED;
            }
            cancelTimeout();
            mMoPubView.loadFailUrl(errorCode);
        }
    }

    public  CustomEventBannerAdapter(MoPubView moPubView, String className, String classData);

}