public void handle()

in features/src/main/java/org/apache/karaf/cellar/features/FeaturesEventHandler.java [57:131]
67 lines of code
19 McCabe index (conditional complexity)

    public void handle(ClusterFeaturesEvent event) {

        if (this.getSwitch().getStatus().equals(SwitchStatus.OFF)) {
            LOGGER.debug("CELLAR FEATURE: {} switch is OFF, cluster event is not handled", SWITCH_ID);
            return;
        }

        if (groupManager == null) {
        	//in rare cases for example right after installation this happens!
        	LOGGER.error("CELLAR FEATURE: 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 FEATURE: 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 FEATURE: cluster event is local (coming from local synchronizer or listener)");
            return;
        }

        String name = event.getName();
        String version = event.getVersion();
        if (isAllowed(event.getSourceGroup(), Constants.CATEGORY, name, EventType.INBOUND) || event.getForce()) {
            FeatureEvent.EventType type = event.getType();
            Boolean isInstalled = isFeatureInstalledLocally(name, version);
            try {
                if (FeatureEvent.EventType.FeatureInstalled.equals(type)) {
                    boolean noRefresh = event.getNoRefresh();
                    boolean noStart = event.getNoStart();
                    boolean noManage = event.getNoManage();
                    boolean upgrade = event.getUpgrade();
                    EnumSet<FeaturesService.Option> options = EnumSet.noneOf(FeaturesService.Option.class);
                    if (noRefresh) {
                        options.add(FeaturesService.Option.NoAutoRefreshBundles);
                    }
                    if (noStart) {
                        options.add(FeaturesService.Option.NoAutoStartBundles);
                    }
                    if (noManage) {
                        options.add(FeaturesService.Option.NoAutoManageBundles);
                    }
                    if (upgrade) {
                        options.add(FeaturesService.Option.Upgrade);
                    }
                    if (version != null) {
                        LOGGER.debug("CELLAR FEATURE: installing feature {}/{}", name, version);
                        featuresService.installFeature(name, version, options);
                    } else {
                        LOGGER.debug("CELLAR FEATURE: installing feature {}", name);
                        featuresService.installFeature(name, options);
                    }
                } else if (FeatureEvent.EventType.FeatureUninstalled.equals(type) && isInstalled) {
                    boolean noRefresh = event.getNoRefresh();
                    EnumSet<FeaturesService.Option> options = EnumSet.noneOf(FeaturesService.Option.class);
                    if (noRefresh) {
                        options.add(FeaturesService.Option.NoAutoRefreshBundles);
                    }
                    if (version != null) {
                        LOGGER.debug("CELLAR FEATURE: uninstalling feature {}/{}", name, version);
                        featuresService.uninstallFeature(name, version, options);
                    } else {
                        LOGGER.debug("CELLAR FEATURE: uninstalling feature {}", name);
                        featuresService.uninstallFeature(name, options);
                    }
                }
            } catch (Exception e) {
                LOGGER.error("CELLAR FEATURE: failed to handle cluster feature event", e);
            }
        } else LOGGER.trace("CELLAR FEATURE: feature {} is marked BLOCKED INBOUND for cluster group {}", name, event.getSourceGroup().getName());
    }