private void updateDelta()

in eureka-core/src/main/java/com/netflix/eureka/registry/RemoteRegionRegistry.java [313:357]
42 lines of code
9 McCabe index (conditional complexity)

    private void updateDelta(Applications delta) {
        int deltaCount = 0;
        for (Application app : delta.getRegisteredApplications()) {
            for (InstanceInfo instance : app.getInstances()) {
                ++deltaCount;
                if (ActionType.ADDED.equals(instance.getActionType())) {
                    Application existingApp = getApplications()
                            .getRegisteredApplications(instance.getAppName());
                    if (existingApp == null) {
                        getApplications().addApplication(app);
                    }
                    logger.debug("Added instance {} to the existing apps ",
                            instance.getId());
                    getApplications().getRegisteredApplications(
                            instance.getAppName()).addInstance(instance);
                } else if (ActionType.MODIFIED.equals(instance.getActionType())) {
                    Application existingApp = getApplications()
                            .getRegisteredApplications(instance.getAppName());
                    if (existingApp == null) {
                        getApplications().addApplication(app);
                    }
                    logger.debug("Modified instance {} to the existing apps ",
                            instance.getId());

                    getApplications().getRegisteredApplications(
                            instance.getAppName()).addInstance(instance);

                } else if (ActionType.DELETED.equals(instance.getActionType())) {
                    Application existingApp = getApplications()
                            .getRegisteredApplications(instance.getAppName());
                    if (existingApp == null) {
                        getApplications().addApplication(app);
                    }
                    logger.debug("Deleted instance {} to the existing apps ",
                            instance.getId());
                    getApplications().getRegisteredApplications(
                            instance.getAppName()).removeInstance(instance);
                }
            }
        }
        logger.debug(
                "The total number of instances fetched by the delta processor : {}",
                deltaCount);

    }