@Override
  public void close() {
    isClosed = true;
    close2();
  }
Returns whether or not one of this <code>CacheListener</code> methods was invoked. Before
returning, the <code>invoked</code> flag is cleared.

@return whether one of this <code>CacheListener</code> methods was invoked
geode-dunit/src/main/java/org/apache/geode/cache30/TestCacheCallback.java