public void handle()

in config/src/main/java/org/apache/karaf/cellar/config/ConfigurationEventHandler.java [44:110]
50 lines of code
17 McCabe index (conditional complexity)

    public void handle(ClusterConfigurationEvent event) {

        // check if the handler is ON
        if (this.getSwitch().getStatus().equals(SwitchStatus.OFF)) {
            LOGGER.debug("CELLAR CONFIG: {} switch is OFF, cluster event not handled", SWITCH_ID);
            return;
        }
        
        if (groupManager == null) {
        	//in rare cases for example right after installation this happens!
        	LOGGER.error("CELLAR CONFIG: retrieved event {} while groupManager is not available yet!", event);
        	return;
        }

        // check if the group is local
        if (!groupManager.isLocalGroup(event.getSourceGroup().getName())) {
            LOGGER.debug("CELLAR CONFIG: node is not part of the event cluster group {}",event.getSourceGroup().getName());
            return;
        }

        // check if it's not a "local" event
        if (event.getLocal() != null && event.getLocal().getId().equalsIgnoreCase(clusterManager.getNode().getId())) {
            LOGGER.trace("CELLAR CONFIG: cluster event is local (coming from local synchronizer or listener)");
            return;
        }

        Group group = event.getSourceGroup();
        String groupName = group.getName();

        Map<String, Properties> clusterConfigurations = clusterManager.getMap(Constants.CONFIGURATION_MAP + Configurations.SEPARATOR + groupName);

        String pid = event.getId();

        if (isAllowed(event.getSourceGroup(), Constants.CATEGORY, pid, EventType.INBOUND)) {
            Dictionary clusterDictionary = clusterConfigurations.get(pid);
            try {
                // update the local configuration
                Configuration localConfiguration = findLocalConfiguration(pid, clusterDictionary);

                if (event.getType() != null && event.getType() == ConfigurationEvent.CM_DELETED) {
                    // delete the configuration
                    if (localConfiguration != null) {
                        deleteConfiguration(localConfiguration);
                    }
                } else {
                    if (clusterDictionary != null && shouldReplicateConfig(clusterDictionary)) {
                        if (localConfiguration == null) {
                            // Create new configuration
                            localConfiguration = createLocalConfiguration(pid, clusterDictionary);
                        }
                        Dictionary localDictionary = localConfiguration.getProperties();
                        if (localDictionary == null)
                            localDictionary = new Properties();
                        localDictionary = filter(localDictionary);
                        if (!equals(clusterDictionary, localDictionary) && canDistributeConfig(localDictionary)) {
                            Dictionary convertedDictionary = convertPropertiesFromCluster(clusterDictionary);

                            localConfiguration.update(convertedDictionary);
                            persistConfiguration(localConfiguration, clusterDictionary);
                        }
                    }
                }
            } catch (Exception ex) {
                LOGGER.error("CELLAR CONFIG: failed to read cluster configuration", ex);
            }
        } else LOGGER.trace("CELLAR CONFIG: configuration PID {} is marked BLOCKED INBOUND for cluster group {}", pid, groupName);
    }