public void handle()

in bundle/src/main/java/org/apache/karaf/cellar/bundle/BundleEventHandler.java [51:136]
75 lines of code
23 McCabe index (conditional complexity)

    public void handle(ClusterBundleEvent event) {

        // check if the handler switch is ON
        if (this.getSwitch().getStatus().equals(SwitchStatus.OFF)) {
            LOGGER.debug("CELLAR BUNDLE: {} 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 BUNDLE: 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 BUNDLE: node is not part of the event cluster group {}", event.getSourceGroup().getName());
            return;
        }

        try {
            // check if it's not a "local" event
            if (event.getLocal() != null && event.getLocal().getId().equalsIgnoreCase(clusterManager.getNode().getId())) {
                LOGGER.trace("CELLAR BUNDLE: cluster event is local (coming from local synchronizer or listener)");
                return;
            }
            // check if the pid is marked as local.
            if (isAllowed(event.getSourceGroup(), Constants.CATEGORY, event.getLocation(), EventType.INBOUND)) {
                // check the features first
                List<Feature> matchingFeatures = retrieveFeature(event.getLocation());
                for (Feature feature : matchingFeatures) {
                    if (!isAllowed(event.getSourceGroup(), "feature", feature.getName(), EventType.INBOUND)) {
                        LOGGER.trace("CELLAR BUNDLE: bundle {} is contained in feature {} marked BLOCKED INBOUND for cluster group {}", event.getLocation(), feature.getName(), event.getSourceGroup().getName());
                        return;
                    }
                }
                if (event.getType() == Bundle.INSTALLED) {
                    installBundleFromLocation(event.getLocation(), event.getStartLevel());
                    LOGGER.debug("CELLAR BUNDLE: installing {}/{}", event.getSymbolicName(), event.getVersion());
                } else if (event.getType() == Bundle.UNINSTALLED) {
                    uninstallBundle(event.getSymbolicName(), event.getVersion());
                    LOGGER.debug("CELLAR BUNDLE: uninstalling {}/{}", event.getSymbolicName(), event.getVersion());
                } else if (event.getType() == Bundle.ACTIVE) {
                    if (!isInstalled(event.getLocation())) {
                        installBundleFromLocation(event.getLocation(), event.getStartLevel());
                    }
                    try {
                        startBundle(event.getSymbolicName(), event.getVersion());
                        LOGGER.debug("CELLAR BUNDLE: starting {}/{}", event.getSymbolicName(), event.getVersion());
                    } catch (Exception e) {
                        // start failed, update cluster state
                        Map<String, BundleState> clusterBundles = clusterManager.getMap(Constants.BUNDLE_MAP + Configurations.SEPARATOR + event.getSourceGroup().getName());
                        BundleState state = clusterBundles.get(event.getSymbolicName() + "/" + event.getVersion());
                        if (state != null) {
                            state.setStatus(Bundle.INSTALLED);
                            clusterBundles.put(event.getSymbolicName() + "/" + event.getVersion(), state);
                        }
                    }
                } else if (event.getType() == Bundle.RESOLVED) {
                    if (!isInstalled(event.getLocation())) {
                        installBundleFromLocation(event.getLocation(), event.getStartLevel());
                        LOGGER.debug("CELLAR BUNDLE: installing {}/{}", event.getSymbolicName(), event.getVersion());
                    }
                    Bundle b = findBundle(event.getLocation());
                    if (b != null) {
                        if (b.getState() == Bundle.ACTIVE) {
                            LOGGER.debug("CELLAR BUNDLE: stopping bundle {}/{} on node", event.getSymbolicName(), event.getVersion());
                            stopBundle(event.getSymbolicName(), event.getVersion());
                        } else if (b.getState() == Bundle.INSTALLED) {
                            LOGGER.debug("CELLAR BUNDLE: resolving bundle {}/{} on node", event.getSymbolicName(), event.getVersion());
                            getBundleContext().getBundle(0).adapt(FrameworkWiring.class).resolveBundles(Collections.singleton(b));
                        }
                    } else {
                        LOGGER.warn("CELLAR BUNDLE: unable to find bundle located {} on node", event.getLocation());
                    }
                } else if (event.getType() == BundleState.UPDATE) {
                    updateBundle(event.getSymbolicName(), event.getVersion(), event.getLocation());
                }
            } else
                LOGGER.trace("CELLAR BUNDLE: bundle {} is marked BLOCKED INBOUND for cluster group {}", event.getSymbolicName(), event.getSourceGroup().getName());
        } catch (BundleException e) {
            LOGGER.error("CELLAR BUNDLE: failed to install bundle {}/{}.", new Object[]{event.getSymbolicName(), event.getVersion()}, e);
        } catch (Exception e) {
        	LOGGER.error("CELLAR BUNDLE: failed to handle bundle event", e);
        }
    }