code: public void eventLocked()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(tc, "eventLocked");
  
      // modify prefetching info
      synchronized (this)
      {
        RemoteDispatchableKey dkey = key.getRemoteDispatchableKey();
        RemoteQPConsumerKey ck = null;
        if (dkey instanceof RemoteQPConsumerKey)
          ck = (RemoteQPConsumerKey) dkey;
  
        if (ck != null)
        {
          ck.messageLocked(key);
          informedConsumerKeyThatLocked = true;
        }
      }
  
      // call superclass
      super.eventLocked();
  
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "eventLocked");
    }
docs: Notification that this message has been locked.