hollow-zenoadapter/src/main/java/com/netflix/hollow/zenoadapter/util/ObjectIdentityOrdinalMap.java
public void put(Object obj, int ordinal) {
        int hashCode = System.identityHashCode(obj);
        int segment = segment(hashCode);
        segments[segment].put(obj, hashCode, ordinal);
    }
public void put(Object obj, int ordinal) {
        int hashCode = System.identityHashCode(obj);
        int segment = segment(hashCode);
        segments[segment].put(obj, hashCode, ordinal);
    }
Associating the obj with an ordinal

@param obj
@param ordinal