Places in code with 6 or more lines that are exactly the same.
Intro
- 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.
- 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."
Duplication Overall
- 16% duplication:
- 9,729 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 1,644 duplicated lines
- 1,960 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events (6%)
--> aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/models (44%)
814
80 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events (6%) --> aws-lambda-java-events/src/main/java/com/amazonaws/services/lambda/runtime/events/models (44%) |
814 | 80 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 43 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events |  IamPolicyResponse.javaIamPolicyResponseV1.java |
36:90 (78%)37:91 (76%) | view |
| 31 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...e/events/models/kinesis | KinesisEvent.javaRecord.java |
81:114 (13%)436:469 (29%) | view |
| 28 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s.../events/models/dynamodb | DynamodbEvent.javaRecord.java |
99:126 (22%)746:773 (20%) | view |
| 23 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | KinesisAnalyticsFirehoseInputPreproce...KinesisAnalyticsStreamsInputPreproces... |
34:74 (35%)34:74 (27%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCustomMessageEvent.javaCognitoUserPoolDefineAuthChallengeEve... |
42:62 (40%)43:63 (33%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCustomMessageEvent.javaCognitoUserPoolVerifyAuthChallengeRes... |
42:62 (40%)42:62 (36%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolDefineAuthChallengeEve...CognitoUserPoolPreTokenGenerationEven... |
43:63 (33%)42:62 (30%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolPreTokenGenerationEven...CognitoUserPoolVerifyAuthChallengeRes... |
42:62 (30%)42:62 (36%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolDefineAuthChallengeEve...CognitoUserPoolVerifyAuthChallengeRes... |
43:63 (33%)42:62 (36%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCustomMessageEvent.javaCognitoUserPoolPreTokenGenerationEven... |
42:62 (40%)42:62 (30%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CloudFrontEvent.javaCodeCommitEvent.java |
906:932 (3%)791:817 (3%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCreateAuthChallengeEve...CognitoUserPoolCustomMessageEvent.java |
43:63 (32%)42:62 (40%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCreateAuthChallengeEve...CognitoUserPoolDefineAuthChallengeEve... |
43:63 (32%)43:63 (33%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCreateAuthChallengeEve...CognitoUserPoolPreTokenGenerationEven... |
43:63 (32%)42:62 (30%) | view |
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCreateAuthChallengeEve...CognitoUserPoolVerifyAuthChallengeRes... |
43:63 (32%)42:62 (36%) | view |
| 15 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCustomMessageEvent.javaCognitoUserPoolMigrateUserEvent.java |
42:58 (37%)42:58 (34%) | view |
| 15 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCustomMessageEvent.javaCognitoUserPoolPreSignUpEvent.java |
42:58 (37%)43:59 (39%) | view |
| 15 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolDefineAuthChallengeEve...CognitoUserPoolPreSignUpEvent.java |
43:59 (31%)43:59 (39%) | view |
| 15 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolMigrateUserEvent.javaCognitoUserPoolPreTokenGenerationEven... |
42:58 (34%)42:58 (28%) | view |
| 15 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCreateAuthChallengeEve...CognitoUserPoolMigrateUserEvent.java |
43:59 (30%)42:58 (34%) | view |
Duplicated Units
The list of top 15 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 16 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | IamPolicyResponse.javaIamPolicyResponseV1.java |
36:53 37:54 | view |
| 15 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | DynamodbTimeWindowEvent.javaKinesisTimeWindowEvent.java |
67:82 67:82 | view |
| 12 | x 7 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolCreateAuthChallengeEve...CognitoUserPoolDefineAuthChallengeEve...CognitoUserPoolCustomMessageEvent.javaCognitoUserPoolPreTokenGenerationEven...CognitoUserPoolMigrateUserEvent.javaCognitoUserPoolVerifyAuthChallengeRes...CognitoUserPoolPreSignUpEvent.java |
42:54 42:54 41:53 41:53 41:53 41:53 42:54 | view |
| 10 | x 3 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CognitoUserPoolPostAuthenticationEven...CognitoUserPoolPreAuthenticationEvent...CognitoUserPoolPostConfirmationEvent.... |
40:50 40:50 40:50 | view |
| 7 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | KinesisEvent.javaS3Event.java |
430:437 53:60 | view |
| 7 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | SNSEvent.javaDynamodbEvent.java |
830:837 180:187 | view |
| 7 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CloudFrontEvent.javaCodeCommitEvent.java |
918:925 803:810 | view |
| 7 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | KinesisAnalyticsFirehoseInputPreproce...KinesisAnalyticsStreamsInputPreproces... |
33:40 33:40 | view |
| 6 | x 2 | aws-lambda-java-core/src...services/lambda/runtimeaws-lambda-java-runtime-...time/api/client/logging | LambdaRuntime.javaStdOutLogSink.java |
15:22 9:15 | view |
| 6 | x 2 | aws-lambda-java-serializ...serialization/factoriesaws-lambda-java-serializ...serialization/factories | JacksonFactory.javaJacksonFactory.java |
180:186 189:195 | view |
| 6 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | IamPolicyResponse.javaIamPolicyResponseV1.java |
55:61 56:62 | view |
| 6 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | IamPolicyResponse.javaIamPolicyResponseV1.java |
63:69 64:70 | view |
| 6 | x 2 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | SQSEvent.javaSNSEvent.java |
193:199 149:155 | view |
| 6 | x 3 | aws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/eventsaws-lambda-java-events/s...s/lambda/runtime/events | CloudFrontEvent.javaKinesisFirehoseEvent.javaCodeCommitEvent.java |
872:878 272:278 757:763 | view |
| 6 | x 2 | aws-lambda-java-events/s...e/events/models/kinesisaws-lambda-java-events/s.../events/models/dynamodb | Record.javaRecord.java |
487:493 793:799 | view |