• There are 220 files with units, with 23,656 lines of code.
• 0 very complex files (McCabe index sum 251+; 0 lines of code)
• 5 complex files (McCabe index sum 126-250; 3,999 lines of code)
• 16 medium complex files (McCabe index sum 51-125; 5,446 lines of code)
• 23 slightly complex files (McCabe index sum 26-50; 4,391 lines of code)
• 176 simple files (McCabe index sum 1-25; 9,820 lines of code)
• 76 main files have no units (e.g. languages without unit analysis, or files without functions) and are not classified.

The McCabe index of a file grows with its size: per 100 lines tells a large but plain file from a dense one, and most complex unit whether the complexity sits in one unit or is spread over many.

File	# lines	# units	McCabe index (sum)	per 100 lines	most complex unit
DiscoveryClient.java in eureka-client/src/main/java/com/netflix/discovery	1246	74	231	19	15
AbstractInstanceRegistry.java in eureka-core/src/main/java/com/netflix/eureka/registry	924	53	184	20	15
InstanceInfo.java in eureka-client/src/main/java/com/netflix/appinfo	767	103	168	22	9
EurekaEntityComparators.java in eureka-client/src/main/java/com/netflix/discovery/util	327	16	155	47	46
EurekaJacksonCodec.java in eureka-client/src/main/java/com/netflix/discovery/converters	735	36	139	19	47
PeerAwareInstanceRegistryImpl.java in eureka-core/src/main/java/com/netflix/eureka/registry	454	33	99	22	9
DefaultEurekaServerConfig.java in eureka-core/src/main/java/com/netflix/eureka	512	79	92	18	7
Converters.java in eureka-client/src/main/java/com/netflix/discovery/converters	492	22	85	17	17
DeserializerStringCache.java in eureka-client/src/main/java/com/netflix/discovery/util	362	41	78	22	6
CodecWrappers.java in eureka-client/src/main/java/com/netflix/discovery/converters/wrappers	287	52	70	24	8
EurekaEntityFunctions.java in eureka-client/src/main/java/com/netflix/discovery/util	247	28	69	28	6
RemoteRegionRegistry.java in eureka-core/src/main/java/com/netflix/eureka/registry	408	19	68	17	11
AwsAsgUtil.java in eureka-core/src/main/java/com/netflix/eureka/aws	360	22	65	18	7
ResponseCacheImpl.java in eureka-core/src/main/java/com/netflix/eureka/registry	388	21	62	16	9
AbstractJersey2EurekaHttpClient.java in eureka-client-jersey2/src/main/java/com/netflix/discovery/shared/transport/jersey2	288	18	60	21	8
Route53Binder.java in eureka-core/src/main/java/com/netflix/eureka/aws	270	22	60	22	8
Applications.java in eureka-client/src/main/java/com/netflix/discovery/shared	283	32	59	21	7
AbstractJerseyEurekaHttpClient.java in eureka-client/src/main/java/com/netflix/discovery/shared/transport/jersey	271	17	57	21	9
EIPManager.java in eureka-core/src/main/java/com/netflix/eureka/aws	280	13	55	20	12
AcceptorExecutor.java in eureka-core/src/main/java/com/netflix/eureka/util/batcher	263	18	53	20	9
DefaultEurekaClientConfig.java in eureka-client/src/main/java/com/netflix/discovery	281	47	51	18	4
EndpointUtils.java in eureka-client/src/main/java/com/netflix/discovery/endpoint	283	9	50	18	18
AmazonInfo.java in eureka-client/src/main/java/com/netflix/appinfo	252	26	50	20	16
EurekaArchaius2ClientConfig.java in eureka-client-archaius2/src/main/java/com/netflix/discovery	188	47	50	27	4
JerseyEurekaHttpClientFactory.java in eureka-client/src/main/java/com/netflix/discovery/shared/transport/jersey	235	18	44	19	6
ReplicationInstance.java in eureka-core/src/main/java/com/netflix/eureka/cluster/protocol	142	22	44	31	16
ElasticNetworkInterfaceBinder.java in eureka-core/src/main/java/com/netflix/eureka/aws	235	12	39	17	7
ReplicationTaskProcessor.java in eureka-core/src/main/java/com/netflix/eureka/cluster	175	10	38	22	7
DiscoveryJerseyProvider.java in eureka-client/src/main/java/com/netflix/discovery/provider	149	13	37	25	5
ApplicationInfoManager.java in eureka-client/src/main/java/com/netflix/appinfo	161	18	37	23	8
EurekaJersey2ClientImpl.java in eureka-client-jersey2/src/main/java/com/netflix/discovery/shared/transport/jersey2	287	24	36	13	4
PeerEurekaNode.java in eureka-core/src/main/java/com/netflix/eureka/cluster	239	16	35	15	7
TaskExecutors.java in eureka-core/src/main/java/com/netflix/eureka/util/batcher	227	10	35	15	11
Jersey2ApplicationClientFactory.java in eureka-client-jersey2/src/main/java/com/netflix/discovery/shared/transport/jersey2	189	12	34	18	9
EurekaJerseyClientImpl.java in eureka-client/src/main/java/com/netflix/discovery/shared/transport/jersey	240	24	34	14	6
DefaultEndpoint.java in eureka-client/src/main/java/com/netflix/discovery/shared/resolver	110	13	34	31	11
InstanceResource.java in eureka-core/src/main/java/com/netflix/eureka/resources	206	7	34	17	8
Application.java in eureka-client/src/main/java/com/netflix/discovery/shared	165	17	33	20	13
PropertiesInstanceConfig.java in eureka-client/src/main/java/com/netflix/appinfo	167	27	33	20	3
PeerEurekaNodes.java in eureka-core/src/main/java/com/netflix/eureka/cluster	191	13	33	17	9
EurekaArchaius2InstanceConfig.java in eureka-client-archaius2/src/main/java/com/netflix/appinfo	154	26	32	21	4
RateLimitingFilter.java in eureka-core/src/main/java/com/netflix/eureka	140	11	32	23	10
DefaultServerCodecs.java in eureka-core/src/main/java/com/netflix/eureka/resources	129	18	30	23	5
PeerReplicationResource.java in eureka-core/src/main/java/com/netflix/eureka/resources	127	11	26	20	7
DnsResolver.java in eureka-client/src/main/java/com/netflix/discovery/endpoint	114	6	24	21	6
JerseyReplicationClient.java in eureka-core/src/main/java/com/netflix/eureka/transport	163	9	24	15	7
Jersey2ReplicationClient.java in eureka-core-jersey2/src/main/java/com/netflix/eureka/transport	157	8	23	15	7
ApplicationResource.java in eureka-core/src/main/java/com/netflix/eureka/resources	126	6	23	18	13
MetricsCollectingEurekaHttpClient.java in eureka-client/src/main/java/com/netflix/discovery/shared/transport/decorator	178	11	22	12	6
EurekaClientFactoryBuilder.java in eureka-client/src/main/java/com/netflix/discovery/shared/transport	137	22	22	16	1

• File complexity is the sum of the McCabe indexes (conditional complexity) of the units (methods, functions...) in a file.
• Files are classified in five categories based on that sum: 1-25 (simple files), 26-50 (slightly complex files), 51-125 (medium complex files), 126-250 (complex files), 251+ (very complex files). The default bands are five times the unit complexity bands, as a file is a group of units.
• Only main code files with units are classified. Files without units (languages without unit analysis, or files without functions) have no complexity to measure and are left out rather than counted as simple.
• A very complex file holds many decisions, which often means it has too many responsibilities: a candidate to split, and a place where changes need more testing.