private void _shuffleAndStoreInstances()

in eureka-client/src/main/java/com/netflix/discovery/shared/Application.java [211:253]
40 lines of code
13 McCabe index (conditional complexity)

    private void _shuffleAndStoreInstances(boolean filterUpInstances, boolean indexByRemoteRegions,
                                           @Nullable Map<String, Applications> remoteRegionsRegistry,
                                           @Nullable EurekaClientConfig clientConfig,
                                           @Nullable InstanceRegionChecker instanceRegionChecker) {
        List<InstanceInfo> instanceInfoList;
        synchronized (instances) {
            instanceInfoList = new ArrayList<InstanceInfo>(instances);
        }
        boolean remoteIndexingActive = indexByRemoteRegions && null != instanceRegionChecker && null != clientConfig
                && null != remoteRegionsRegistry;
        if (remoteIndexingActive || filterUpInstances) {
            Iterator<InstanceInfo> it = instanceInfoList.iterator();
            while (it.hasNext()) {
                InstanceInfo instanceInfo = it.next();
                if (filterUpInstances && InstanceStatus.UP != instanceInfo.getStatus()) {
                    it.remove();
                } else if (remoteIndexingActive) {
                    String instanceRegion = instanceRegionChecker.getInstanceRegion(instanceInfo);
                    if (!instanceRegionChecker.isLocalRegion(instanceRegion)) {
                        Applications appsForRemoteRegion = remoteRegionsRegistry.get(instanceRegion);
                        if (null == appsForRemoteRegion) {
                            appsForRemoteRegion = new Applications();
                            remoteRegionsRegistry.put(instanceRegion, appsForRemoteRegion);
                        }

                        Application remoteApp =
                                appsForRemoteRegion.getRegisteredApplications(instanceInfo.getAppName());
                        if (null == remoteApp) {
                            remoteApp = new Application(instanceInfo.getAppName());
                            appsForRemoteRegion.addApplication(remoteApp);
                        }

                        remoteApp.addInstance(instanceInfo);
                        this.removeInstance(instanceInfo, false);
                        it.remove();
                    }
                }
            }

        }
        Collections.shuffle(instanceInfoList, shuffleRandom);
        this.shuffledInstances.set(instanceInfoList);
    }