Duplication · Netflix/zuul

Duplication Overall

3% duplication:

13,452 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
494 duplicated lines

38 duplicates

dependency graphs: 2D graph | 2D graph (with duplicates)... | 3D graph | 3D graph (with duplicates)...

Duplication per Extension

Duplication per Component (primary)

Longest Duplicates

The list of 38 longest duplicates.

See data for all 38 duplicates...

Size	#	Folders	Files	Lines	Code
18	x 2	zuul-core/src/main/java/...tflix/zuul/netty/server zuul-core/src/main/java/...tflix/zuul/netty/server	BaseServerStartup.java BaseServerStartup.java	161:183 (7%) 189:211 (7%)	view
17	x 2	zuul-core/src/main/java/...tflix/zuul/message/http zuul-core/src/main/java/...tflix/zuul/message/http	HttpRequestMessageImpl.java HttpResponseMessageImpl.java	180:208 (4%) 81:109 (11%)	view
13	x 2	zuul-core/src/jmh/java/com/netflix/zuul/message zuul-core/src/jmh/java/com/netflix/zuul/message	HeadersBenchmark.java HeadersBenchmark.java	49:61 (13%) 104:116 (13%)	view
10	x 2	zuul-core/src/main/java/...tflix/zuul/message/http zuul-core/src/main/java/...tflix/zuul/message/http	HttpRequestMessageImpl.java HttpRequestMessageImpl.java	107:116 (2%) 133:142 (2%)	view
10	x 2	zuul-core/src/main/java/...tflix/zuul/message/http zuul-core/src/main/java/...tflix/zuul/message/http	HttpRequestMessageImpl.java HttpResponseMessageImpl.java	223:238 (2%) 109:124 (7%)	view
9	x 2	zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle	RejectionUtils.java RejectionUtils.java	177:185 (5%) 218:226 (5%)	view
8	x 2	zuul-sample/src/main/java/com/netflix/zuul/sample zuul-sample/src/main/java/com/netflix/zuul/sample	SampleServerStartup.java SampleServerStartup.java	223:232 (5%) 246:255 (5%)	view
8	x 2	zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle	RejectionUtils.java RejectionUtils.java	209:216 (5%) 244:251 (5%)	view
8	x 2	zuul-core/src/main/java/...etflix/netty/common/ssl zuul-core/src/main/java/...etflix/netty/common/ssl	SslHandshakeInfo.java SslHandshakeInfo.java	63:70 (7%) 112:119 (7%)	view
8	x 2	zuul-core/src/main/java/...etflix/netty/common/ssl zuul-core/src/main/java/...etflix/netty/common/ssl	SslHandshakeInfo.java SslHandshakeInfo.java	89:96 (7%) 115:122 (7%)	view
8	x 2	zuul-core/src/main/java/com/netflix/zuul/message zuul-core/src/main/java/com/netflix/zuul/message	Headers.java Headers.java	565:574 (2%) 590:599 (2%)	view
8	x 2	zuul-core/src/main/java/...etflix/netty/common/ssl zuul-core/src/main/java/...etflix/netty/common/ssl	ServerSslConfig.java ServerSslConfig.java	93:100 (8%) 118:125 (8%)	view
8	x 2	zuul-core/src/main/java/...tflix/zuul/netty/server zuul-sample/src/main/java/com/netflix/zuul/sample	BaseServerStartup.java SampleServerStartup.java	81:88 (3%) 80:87 (5%)	view
7	x 2	zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle	RejectionUtils.java RejectionUtils.java	105:111 (4%) 247:253 (4%)	view
7	x 2	zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle	RejectionUtils.java RejectionUtils.java	180:186 (4%) 258:264 (4%)	view
7	x 2	zuul-core/src/main/java/...ix/netty/common/metrics zuul-core/src/main/java/...ix/netty/common/metrics	Http2MetricsChannelHandlers.java Http2MetricsChannelHandlers.java	106:113 (8%) 141:148 (8%)	view
7	x 2	zuul-core/src/main/java/...etflix/netty/common/ssl zuul-core/src/main/java/...etflix/netty/common/ssl	SslHandshakeInfo.java SslHandshakeInfo.java	49:55 (6%) 87:93 (6%)	view
7	x 2	zuul-core/src/main/java/...ix/netty/common/metrics zuul-core/src/main/java/...lix/zuul/netty/insights	HttpBodySizeRecordingChannelHandler.java PassportStateHttpServerHandler.java	78:86 (11%) 66:74 (16%)	view
7	x 2	zuul-core/src/main/java/com/netflix/zuul/filters zuul-core/src/main/java/com/netflix/zuul/filters	Endpoint.java SyncZuulFilterAdapter.java	27:38 (70%) 52:63 (20%)	view
7	x 2	zuul-core/src/main/java/...tflix/zuul/message/http zuul-core/src/main/java/...tflix/zuul/message/http	HttpRequestMessageImpl.java HttpResponseMessageImpl.java	208:218 (1%) 129:139 (4%)	view
6	x 2	zuul-core/src/jmh/java/com/netflix/zuul/message zuul-core/src/jmh/java/com/netflix/zuul/message	HeadersBenchmark.java HeadersBenchmark.java	38:45 (6%) 91:98 (6%)	view
6	x 2	zuul-sample/src/main/java/com/netflix/zuul/sample zuul-sample/src/main/java/com/netflix/zuul/sample	SampleServerStartup.java SampleServerStartup.java	167:173 (4%) 201:207 (4%)	view
6	x 2	zuul-sample/src/main/java/com/netflix/zuul/sample zuul-sample/src/main/java/com/netflix/zuul/sample	SampleServerStartup.java SampleServerStartup.java	203:208 (4%) 223:228 (4%)	view
6	x 2	zuul-sample/src/main/java/com/netflix/zuul/sample zuul-sample/src/main/java/com/netflix/zuul/sample	SampleServerStartup.java SampleServerStartup.java	203:208 (4%) 246:251 (4%)	view
6	x 2	zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle	RejectionUtils.java RejectionUtils.java	221:226 (3%) 258:263 (3%)	view
6	x 2	zuul-core/src/main/java/...tflix/zuul/netty/filter zuul-core/src/main/java/...tflix/zuul/netty/filter	BaseZuulFilterRunner.java BaseZuulFilterRunner.java	148:153 (2%) 175:180 (2%)	view
6	x 2	zuul-core/src/main/java/...tflix/zuul/message/http zuul-core/src/main/java/...tflix/zuul/message/http	HttpRequestMessageImpl.java HttpRequestMessageImpl.java	419:424 (1%) 440:445 (1%)	view
6	x 2	zuul-core/src/main/java/...ix/netty/common/metrics zuul-core/src/main/java/...ix/netty/common/metrics	HttpBodySizeRecordingChannelHandler.java HttpBodySizeRecordingChannelHandler.java	63:73 (9%) 96:106 (9%)	view
6	x 2	zuul-core/src/main/java/...etflix/netty/common/ssl zuul-core/src/main/java/...etflix/netty/common/ssl	SslHandshakeInfo.java SslHandshakeInfo.java	51:56 (5%) 66:71 (5%)	view
6	x 2	zuul-core/src/main/java/...etflix/netty/common/ssl zuul-core/src/main/java/...etflix/netty/common/ssl	SslHandshakeInfo.java SslHandshakeInfo.java	74:79 (5%) 99:104 (5%)	view
6	x 2	zuul-core/src/main/java/...flix/netty/common/http2 zuul-core/src/main/java/...flix/netty/common/http2	DynamicHttp2FrameLogger.java DynamicHttp2FrameLogger.java	80:85 (3%) 93:98 (3%)	view
6	x 2	zuul-core/src/main/java/...tflix/zuul/netty/server zuul-core/src/main/java/...tflix/zuul/netty/server	Server.java Server.java	182:187 (2%) 200:205 (2%)	view
6	x 2	zuul-core/src/main/java/...ul/netty/connectionpool zuul-core/src/main/java/...ul/netty/connectionpool	DefaultClientChannelManager.java PerServerConnectionPool.java	257:263 (2%) 399:405 (2%)	view
6	x 2	zuul-core/src/main/java/...ul/netty/connectionpool zuul-core/src/main/java/...ul/netty/connectionpool	DefaultClientChannelManager.java PerServerConnectionPool.java	357:362 (2%) 90:95 (2%)	view
6	x 2	zuul-core/src/main/java/com/netflix/zuul/message zuul-core/src/main/java/...tflix/zuul/netty/server	Header.java NamedSocketAddress.java	46:52 (18%) 51:57 (22%)	view
6	x 2	zuul-core/src/main/java/...ul/netty/connectionpool zuul-core/src/main/java/...lix/zuul/netty/insights	ClientTimeoutHandler.java PassportStateHttpClientHandler.java	58:67 (15%) 56:65 (16%)	view
6	x 2	zuul-core/src/main/java/...lix/zuul/netty/insights zuul-core/src/main/java/...lix/zuul/netty/insights	PassportLoggingHandler.java PassportStateHttpServerHandler.java	62:67 (8%) 69:74 (14%)	view
6	x 2	zuul-core/src/main/java/...ix/netty/common/metrics zuul-core/src/main/java/...lix/zuul/netty/insights	HttpBodySizeRecordingChannelHandler.java PassportLoggingHandler.java	81:86 (9%) 62:67 (8%)	view

Most Frequent Duplicates

The list of 3 most frequently found duplicates.

Size	#	Folders	Files	Lines	Code
6	x 3	zuul-sample/src/main/java/com/netflix/zuul/sample zuul-sample/src/main/java/com/netflix/zuul/sample zuul-sample/src/main/java/com/netflix/zuul/sample	SampleServerStartup.java SampleServerStartup.java SampleServerStartup.java	203:208 (4%) 223:228 (4%) 246:251 (4%)	view
6	x 3	zuul-core/src/main/java/...ix/netty/common/metrics zuul-core/src/main/java/...lix/zuul/netty/insights zuul-core/src/main/java/...lix/zuul/netty/insights	HttpBodySizeRecordingChannelHandler.java PassportStateHttpServerHandler.java PassportLoggingHandler.java	81:86 (9%) 69:74 (14%) 62:67 (8%)	view
6	x 3	zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle zuul-core/src/main/java/...x/netty/common/throttle	RejectionUtils.java RejectionUtils.java RejectionUtils.java	180:185 (3%) 221:226 (3%) 258:263 (3%)	view

About This Analysis

For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.

Learn more...

To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:

Avoid Repetition, MartinFlower.com (IEEE Software article)
Refactoring duplicated code, sourcemaking.com
Beck Design Rules, MartinFowler.com
DRY (Don't Repeat Yourself) Principle, Wikipedia
The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:

"Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"

Reducing Coupling, MartinFlower.com (IEEE Software article):

"There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."