@Override
  public int getDSFID() {
    return FILTER_PROFILE;
  }
get the clients interested in the given event that are attached to this server.

@param event the entry event being applied to the cache
@param akc allKeyClients collection
@param koi keysOfInterest collection
@param pats patternsOfInterest collection
@param foi filtersOfInterest collection
@return a set of the clients interested in the event
geode-core/src/main/java/org/apache/geode/internal/cache/FilterProfile.java