code: public void addCache(
          I_CmsGlobalConfigurationCache offlineCache,
          I_CmsGlobalConfigurationCache onlineCache,
          String debugName) {
  
          CachePair cachePair = new CachePair(offlineCache, onlineCache, debugName);
          m_caches.add(cachePair);
      }
docs: Adds a new pair of cache instances which should be managed by this event handler.<p>
  
  @param offlineCache the offline cache instance
  @param onlineCache the online cache instance
  @param debugName an identifier used for debugging