• There are 208 files with units, with 20,701 lines of code.
• 1 very complex files (McCabe index sum 251+; 1,467 lines of code)
• 0 complex files (McCabe index sum 126-250; 0 lines of code)
• 8 medium complex files (McCabe index sum 51-125; 2,843 lines of code)
• 27 slightly complex files (McCabe index sum 26-50; 5,019 lines of code)
• 172 simple files (McCabe index sum 1-25; 11,372 lines of code)
• 42 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
AbstractCommand.java in hystrix-core/src/main/java/com/netflix/hystrix	1467	124	267	18	21
FallbackMethod.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/utils	346	36	90	26	15
HystrixCommandProperties.java in hystrix-core/src/main/java/com/netflix/hystrix	438	86	88	20	2
MetaHolder.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/command	409	71	85	21	3
HystrixServoMetricsPublisherCommand.java in hystrix-contrib/hystrix-servo-metrics-publisher/src/main/java/com/netflix/hystrix/contrib/servopublisher	521	67	70	13	2
ExecutionResult.java in hystrix-core/src/main/java/com/netflix/hystrix	295	39	70	24	7
HystrixRollingNumber.java in hystrix-core/src/main/java/com/netflix/hystrix/util	333	31	63	19	10
HystrixRollingPercentile.java in hystrix-core/src/main/java/com/netflix/hystrix/util	317	26	59	19	10
HystrixRequestCache.java in hystrix-core/src/main/java/com/netflix/hystrix	184	16	51	28	11
HystrixPropertiesManager.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/conf	344	45	50	15	5
HystrixCommandAspect.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/aop/aspectj	280	15	48	17	11
HystrixPlugins.java in hystrix-core/src/main/java/com/netflix/hystrix/strategy	211	21	47	22	6
HystrixPropertiesChainedArchaiusProperty.java in hystrix-core/src/main/java/com/netflix/hystrix/strategy/properties	225	42	46	20	4
MethodProvider.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/utils	209	24	44	21	8
HystrixCollapserProperties.java in hystrix-core/src/main/java/com/netflix/hystrix	205	40	40	20	1
Striped64.java in hystrix-core/src/main/java/com/netflix/hystrix/util	173	7	38	22	27
HystrixCommand.java in hystrix-core/src/main/java/com/netflix/hystrix	199	19	36	18	13
HystrixEventType.java in hystrix-core/src/main/java/com/netflix/hystrix	103	6	36	35	19
HystrixCommandMetrics.java in hystrix-core/src/main/java/com/netflix/hystrix	236	31	36	15	4
HystrixThreadPoolProperties.java in hystrix-core/src/main/java/com/netflix/hystrix	168	33	35	21	3
HystrixCircuitBreaker.java in hystrix-core/src/main/java/com/netflix/hystrix	170	16	35	21	6
HystrixObservableCollapser.java in hystrix-core/src/main/java/com/netflix/hystrix	252	21	35	14	8
HystrixThreadPoolMetrics.java in hystrix-core/src/main/java/com/netflix/hystrix	178	30	34	19	3
HystrixCollapser.java in hystrix-core/src/main/java/com/netflix/hystrix	220	22	32	15	6
RequestBatch.java in hystrix-core/src/main/java/com/netflix/hystrix/collapser	163	6	32	20	14
CachedValuesHistogram.java in hystrix-core/src/main/java/com/netflix/hystrix/metric	107	6	32	30	27
HystrixPropertiesChainedProperty.java in hystrix-core/src/main/java/com/netflix/hystrix/strategy/properties	168	24	32	19	5
HystrixCommandExecutionHook.java in hystrix-core/src/main/java/com/netflix/hystrix/strategy/executionhook	106	32	32	30	1
HystrixCommandConfiguration.java in hystrix-core/src/main/java/com/netflix/hystrix/config	201	31	31	15	1
AbstractHystrixCommand.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/command	130	13	28	22	5
LongMaxUpdater.java in hystrix-core/src/main/java/com/netflix/hystrix/util	85	12	28	33	9
AopUtils.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/utils	133	8	27	20	7
HystrixMetricsPoller.java in hystrix-contrib/hystrix-metrics-event-stream/src/main/java/com/netflix/hystrix/contrib/metrics/eventstream	385	14	27	7	6
LongAdder.java in hystrix-core/src/main/java/com/netflix/hystrix/util	87	14	26	30	7
HystrixThreadPool.java in hystrix-core/src/main/java/com/netflix/hystrix	139	12	26	19	7
HystrixContextScheduler.java in hystrix-core/src/main/java/com/netflix/hystrix/strategy/concurrency	142	20	26	18	3
GenericObservableCommand.java in hystrix-contrib/hystrix-javanica/src/main/java/com/netflix/hystrix/contrib/javanica/command	128	7	25	20	7
Hystrix.java in hystrix-core/src/main/java/com/netflix/hystrix	123	15	25	20	4
HystrixRequestLog.java in hystrix-core/src/main/java/com/netflix/hystrix	138	7	25	18	16
HystrixRequestEvents.java in hystrix-core/src/main/java/com/netflix/hystrix/metric	143	14	25	17	7
SerialHystrixDashboardData.java in hystrix-serialization/src/main/java/com/netflix/hystrix/serial	341	10	23	7	5
CollapsedRequestSubject.java in hystrix-core/src/main/java/com/netflix/hystrix/collapser	98	11	23	23	4
CommandExecutionPerfTest.java in hystrix-core/src/jmh/java/com/netflix/hystrix/perf	269	15	23	9	2
HystrixServoMetricsPublisherThreadPool.java in hystrix-contrib/hystrix-servo-metrics-publisher/src/main/java/com/netflix/hystrix/contrib/servopublisher	217	20	22	10	2
HystrixRollingNumberEvent.java in hystrix-core/src/main/java/com/netflix/hystrix/util	40	4	21	53	18
HystrixServoMetricsPublisherCollapser.java in hystrix-contrib/hystrix-servo-metrics-publisher/src/main/java/com/netflix/hystrix/contrib/servopublisher	227	18	20	9	2
HystrixYammerMetricsPublisherCommand.java in hystrix-contrib/hystrix-yammer-metrics-publisher/src/main/java/com/netflix/hystrix/contrib/yammermetricspublisher	462	17	20	4	2
RequestCollapser.java in hystrix-core/src/main/java/com/netflix/hystrix/collapser	102	6	20	20	7
HystrixConfigurationStream.java in hystrix-core/src/main/java/com/netflix/hystrix/config	153	16	19	12	2
HystrixCollapserMetrics.java in hystrix-core/src/main/java/com/netflix/hystrix	112	17	19	17	3

• 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.