public void unRegisterGroup()

in hazelcast/src/main/java/org/apache/karaf/cellar/hazelcast/HazelcastGroupManager.java [541:603]
53 lines of code
12 McCabe index (conditional complexity)

    public void unRegisterGroup(Group group) {
        ClassLoader originalClassLoader = Thread.currentThread().getContextClassLoader();
        try {
            Thread.currentThread().setContextClassLoader(combinedClassLoader);
            String groupName = group.getName();
            // remove local node from cluster group
            group.getNodes().remove(getNode());
            listGroups().put(groupName, group);

            // un-register cluster group consumers
            if (consumerRegistrations != null && !consumerRegistrations.isEmpty()) {
                ServiceRegistration consumerRegistration = consumerRegistrations.get(groupName);
                if (consumerRegistration != null) {
                    consumerRegistration.unregister();
                    consumerRegistrations.remove(groupName);
                }
            }

            // un-register cluster group producers
            if (producerRegistrations != null && !producerRegistrations.isEmpty()) {
                ServiceRegistration producerRegistration = producerRegistrations.get(groupName);
                if (producerRegistration != null) {
                    producerRegistration.unregister();
                    producerRegistrations.remove(groupName);
                }
            }

            // remove consumers & producers
            groupProducers.remove(groupName);
            EventConsumer consumer = groupConsumer.remove(groupName);
            if (consumer != null) {
                consumer.stop();
            }

            Node node = getNode();
            group.getNodes().add(node);
            Map<Node, Set<String>> map = getClusterGroups();
            Set<String> groupNames = (Set<String>) map.get(node);
            groupNames = new HashSet<String>(groupNames);
            groupNames.remove(groupName);
            map.put(node, groupNames);

            // remove cluster group from configuration
            try {
                Configuration configuration = getConfigurationForNode();
                Dictionary<String, Object> properties = configuration.getProperties();
                String groups = (String) properties.get(Configurations.GROUPS_KEY);
                if (groups == null || groups.isEmpty()) {
                    groups = "";
                } else if (groups.contains(groupName)) {
                    Set<String> groupNamesSet = convertStringToSet(groups);
                    groupNamesSet.remove(groupName);
                    groups = convertSetToString(groupNamesSet);
                }
                properties.put(Configurations.GROUPS_KEY, groups);
                updateConfiguration(configuration, properties);
            } catch (IOException e) {
                LOGGER.error("CELLAR HAZELCAST: failed to read cluster group configuration", e);
            }
        } finally {
            Thread.currentThread().setContextClassLoader(originalClassLoader);
        }
    }