code: protected Future<?> dispatch(final int eventType, final String factoryPid, final String pid) {
          final ConfigurationEvent event = createConfigurationEvent(eventType, factoryPid, pid);
          if (event == null)
              return null;
  
          final ServiceReference<ConfigurationListener>[] refs = st.getServiceReferences();
          if (refs == null)
              return null;
  
          final String qPid = (factoryPid != null) ? factoryPid : pid;
          return caFactory.updateQueue.add(qPid, new Runnable() {
              @Override
              @FFDCIgnore(Exception.class)
              public void run() {
                  if (TraceComponent.isAnyTracingEnabled() && tc.isEventEnabled()) {
                      Tr.event(tc, "dispatch: sending configuration listener event for " + qPid);
                  }
                  for (ServiceReference<ConfigurationListener> sr : refs) {
                      if (sr != null) {
                          ConfigurationListener cl = st.getService(sr);
                          if (cl != null && FrameworkState.isValid()) {
                              try {
                                  cl.configurationEvent(event);
                              } catch (Exception e) {
                                  if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled()) {
                                      Tr.debug(tc, "dispatch(): Exception thrown while trying to dispatch ConfigurationEvent.", e);
                                  }
                                  FFDCFilter.processException(e, ME,
                                                              "dispatch(): Exception thrown while trying to dispatch ConfigurationEvent.",
                                                              new Object[] { pid, factoryPid, eventType, cl });
                              }
                          }
                      }
                  }
              }
          });
      }
docs: Dispatch ConfigurationEvent to the ConfigurationListeners.
  
  @param pid
  - Service PID
  @param factoryPid
  - factory PID
  @param eventType
  - ConfigurationEvent type