@Override
  public AsyncEvent<?, ?> take() throws CacheException {
    // Unsupported since we have no callers.
    // If we do want to support it then each caller needs
    // to call freeOffHeapResources and the returned GatewaySenderEventImpl
    throw new UnsupportedOperationException();
  }
Whether the <code>Gateway</code> queue should be no-ack instead of ack.
geode-core/src/main/java/org/apache/geode/internal/cache/wan/serial/SerialGatewaySenderQueue.java