private CacheEntry searchWithCacheMiss(Ruby runtime, final String id, final boolean cacheUndef) {
        final int token = generation;

        CacheEntry methodEntry = searchMethodEntryInner(id);

        if (methodEntry == null) {
            if (cacheUndef) {
                return addToCache(id, UndefinedMethod.getInstance(), this, token);
            }
            return cacheEntryFactory.newCacheEntry(id, UndefinedMethod.getInstance(), methodEntry.sourceModule, token);
        } else if (!runtime.isBooting()) {
            addToCache(id, methodEntry);
        }

        return methodEntry;
    }