code: protected void changedCacheData (String cache, final Streamable data)
      {
          // see if we have any observers
          ObserverList<StaleCacheObserver> list = _cacheobs.get(cache);
          if (list == null) {
              return;
          }
          // if so, notify them
          list.apply(new ObserverList.ObserverOp<StaleCacheObserver>() {
              public boolean apply (StaleCacheObserver observer) {
                  observer.changedCacheData(data);
                  return true;
              }
          });
      }
docs: Called when possibly cached data has changed on one of our peer servers.