public int getQueueSize() {
    return _messageDispatcher == null ? 0 : _messageDispatcher.getQueueSize();
  }
Returns the size of the queue for heuristic purposes. This size may be changing concurrently if
puts/gets are occurring at the same time.
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientProxy.java