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![Task: Subclasses of Number? START n=node:types(name="java.lang.Number") MATCH n<-[:SUPER_TYPE]-s RETURN s.name ORDER BY s.name; •Return just the name •Order them alphabetically 11 11](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-13-2048.jpg)
![Task: Which Methods does it have / how many START n=node:types(name="java.lang.Number") MATCH n-[:METHOD_OF|FIELD_OF]->m RETURN m; •Find the top 5 classes with the most members 12 12](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-15-2048.jpg)
![Task: Calculate the fan-out of java.lang.StringBuilder START o=node:types(name="j.l.StringBuilder") MATCH o-[:FIELD_OF]->f-[:FIELD_TYPE]->tf, o-[:METHOD_OF]->m-[:PARAM_TYPE]->tp, m-[:RETURN_TYPE]->tr RETURN o,count(distinct tf) + count(distinct tp) + count(distinct tr) as fan_out; •Calculate fan-in •Which class has the highest fan-out •What about package-level? 13 13](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-17-2048.jpg)
![Task: Find longest Inheritance Path start c=node:types(name="java.lang.Object") match path=p<-[:SUPER_TYPE*]-c return extract(n in nodes(path) : n.name), length(path) as len order by len desc limit 5; 14 14](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-19-2048.jpg)
![Task: Find the class that used IOException most often START ex=node:types(name="java.io.IOException" MATCH ex<-[:THROWS]-m<-[:METHOD_OF]-c RETURN c, count(*) ORDER BY count(*) LIMIT 5; 15 15](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-21-2048.jpg)
![Task: Which other classes did classes that threw IOException use most often? START ex=node:types(name="java.io.IOException") MATCH ex<-[:THROWS]-m<-[:METHOD_OF]-c, mbr<-[:METHOD_OF|FIELD_OF]-c, mbr-[:FIELD_TYPE|PARAM_TYPE| RETURN_TYPE|THROWS]->other_type WHERE other_type.name =~ /.+[.].+/ RETURN other_type.name, count(*) ORDER BY count(*) desc LIMIT 10; •What could be a source of IOExceptions 16 16](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-23-2048.jpg)
![Task: Find a class you like and add a field with your name and some type START c=node:types(name="void"), t=node:types(name="java.lang.reflect.Proxy") CREATE c-[:FIELD_OF]->(field {name:“Michael“}) -[:FIELD_TYPE]->t; 17 17](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-25-2048.jpg)
![Task: Delete the most annoying class and all its methods, fields and their relationships START c=node:types(name="java.awt.List"), MATCH c-[r1:FIELD_OF|METHOD_OF]->mbr-[r2]-() c-[r]-() DELETE c,mbr,r1,r2,r; 18 18](https://image.slidesharecdn.com/classgraphneo4jandsoftwaremetrics-130409003023-phpapp01/75/Class-graph-neo4j-and-software-metrics-27-2048.jpg)
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Class graph neo4j and software metrics
The document discusses the use of graphs in software technology, specifically emphasizing dependency analysis and software metrics for visualizing relationships between classes and methods. It introduces the 'class-graph' tool for scanning Java files and performing various tasks using the Neo4j database and Cypher queries. A series of practical tasks are outlined, demonstrating how to analyze class hierarchies, dependencies, and other software metrics related to Java coding.
Class graph neo4j and software metrics
- 1. Neo4j in Action SoftwareMetrics Michael Hunger (@mesirii) 1 1
- 2. Graphs in SoftwareTechnolgoy ๏ UML Diagrams are graphs ๏ dependencies between classes, packages, modules etc are graphs ๏ Software Metrics use dependency analysis ๏ Visualizations ๏ Cyclomatic Complexity, ๏ Fan-in (afferent-coupling) / Fan-out (efferent coupling) etc. 2 2
- 3. Code City 3 3
- 4. Class Diagram isa Graph 4 4
- 5. SonarJ 5 5
- 6. But there ismore ๏Visualize & query Method, Field dependencies ๏Collaborative filtering (co-usage) ๏Ranking ๏God classes ๏Paths between classes 6 6
- 7. Welcome to Class-Graph ๏takea JAR ๏put it under ASM ๏scan it superfast ๏pull everything into Neo4j ๏add categories, indexes ๏Have Fun http://github.com/jexp/class-graph 7 7
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- 9. Interactive Hands-On Session ๏Lotsof tasks ๏use Cypher to solve them http://neo4j.org/resources/cypher ๏be creative, work together ๏ask ! ๏Server http://bit.ly/innoq-neo4j ๏just the beginning 9 9
- 10. Task: Find java.lang.Numberand return it 10 10
- 11. Task: Find java.lang.Numberand return it START o=node:types(name="java.lang.Number") RETURN o; 10 10
- 12. Task: Subclasses ofNumber? •Return just the name •Order them alphabetically 11 11
- 13. Task: Subclasses ofNumber? START n=node:types(name="java.lang.Number") MATCH n<-[:SUPER_TYPE]-s RETURN s.name ORDER BY s.name; •Return just the name •Order them alphabetically 11 11
- 14. Task: Which Methodsdoes it have / how many •Find the top 5 classes with the most members 12 12
- 15. Task: Which Methodsdoes it have / how many START n=node:types(name="java.lang.Number") MATCH n-[:METHOD_OF|FIELD_OF]->m RETURN m; •Find the top 5 classes with the most members 12 12
- 16. Task: Calculate thefan-out of java.lang.StringBuilder •Calculate fan-in •Which class has the highest fan-out •What about package-level? 13 13
- 17. Task: Calculate thefan-out of java.lang.StringBuilder START o=node:types(name="j.l.StringBuilder") MATCH o-[:FIELD_OF]->f-[:FIELD_TYPE]->tf, o-[:METHOD_OF]->m-[:PARAM_TYPE]->tp, m-[:RETURN_TYPE]->tr RETURN o,count(distinct tf) + count(distinct tp) + count(distinct tr) as fan_out; •Calculate fan-in •Which class has the highest fan-out •What about package-level? 13 13
- 18. Task: Find longestInheritance Path 14 14
- 19. Task: Find longestInheritance Path start c=node:types(name="java.lang.Object") match path=p<-[:SUPER_TYPE*]-c return extract(n in nodes(path) : n.name), length(path) as len order by len desc limit 5; 14 14
- 20. Task: Find theclass that used IOException most often 15 15
- 21. Task: Find theclass that used IOException most often START ex=node:types(name="java.io.IOException" MATCH ex<-[:THROWS]-m<-[:METHOD_OF]-c RETURN c, count(*) ORDER BY count(*) LIMIT 5; 15 15
- 22. Task: Which otherclasses did classes that threw IOException use most often? •What could be a source of IOExceptions 16 16
- 23. Task: Which otherclasses did classes that threw IOException use most often? START ex=node:types(name="java.io.IOException") MATCH ex<-[:THROWS]-m<-[:METHOD_OF]-c, mbr<-[:METHOD_OF|FIELD_OF]-c, mbr-[:FIELD_TYPE|PARAM_TYPE| RETURN_TYPE|THROWS]->other_type WHERE other_type.name =~ /.+[.].+/ RETURN other_type.name, count(*) ORDER BY count(*) desc LIMIT 10; •What could be a source of IOExceptions 16 16
- 24. Task: Find aclass you like and add a field with your name and some type 17 17
- 25. Task: Find aclass you like and add a field with your name and some type START c=node:types(name="void"), t=node:types(name="java.lang.reflect.Proxy") CREATE c-[:FIELD_OF]->(field {name:“Michael“}) -[:FIELD_TYPE]->t; 17 17
- 26. Task: Delete themost annoying class and all its methods, fields and their relationships 18 18
- 27. Task: Delete themost annoying class and all its methods, fields and their relationships START c=node:types(name="java.awt.List"), MATCH c-[r1:FIELD_OF|METHOD_OF]->mbr-[r2]-() c-[r]-() DELETE c,mbr,r1,r2,r; 18 18