public boolean processDispatchedMessage(ClientProxyMembershipID proxyId, EventID eid) {
    boolean success = false;
    CacheClientProxy proxy = getClientProxy(proxyId);
    if (proxy != null) {
      HARegionQueue harq = proxy.getHARegionQueue();
      harq.addDispatchedMessage(new ThreadIdentifier(eid.getMembershipID(), eid.getThreadID()),
          eid.getSequenceID());
      success = true;
    }
    return success;
  }
Adds or updates entry in the dispatched message map when client sends an ack.
geode-core/src/main/java/org/apache/geode/internal/cache/tier/sockets/CacheClientNotifier.java