Top-N-Paths

Project demonstrates capabilities of Java 8 Stream API and lambdas Task to find top most N-pages path in log like

user	page
U1	/
U2	/
U1	/page
U1	/filter
U1	/catalog
U3	/
U4	/
U2	/new
U2	/catalog
U1	/pageZ

U* is a id of user session, second column is visit page from a log file

Examples of N-page-paths, where N=3:

• / -> /new -> /catalog
• / -> /page -> /filter
• /page -> /filter -> /catalog
• /filter -> /catalog ->pageZ

example of maven build

bash-3.2$ mvn clean test package
[INFO] Scanning for projects...
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building topnpath 1.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ topnpath ---
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ topnpath ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ topnpath ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /work/top3paths/topnpath/target/classes
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ topnpath ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.6.1:testCompile (default-testCompile) @ topnpath ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 1 source file to /work/top3paths/topnpath/target/test-classes
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ topnpath ---
[INFO] Surefire report directory: /work/top3paths/topnpath/target/surefire-reports

-------------------------------------------------------
 T E S T S
-------------------------------------------------------
Running us.filin.topnpaths.TopMostPopularPathsTest
/ -> subscribers -> filter
subscribers -> filter -> export
filter -> export -> /
export -> / -> subscribers
/ -> catalog -> edit
catalog -> edit -> /
edit -> / -> catalog
Tests run: 5, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.13 sec

Results :

Tests run: 5, Failures: 0, Errors: 0, Skipped: 0

[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ topnpath ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 0 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.6.1:compile (default-compile) @ topnpath ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-resources-plugin:2.6:testResources (default-testResources) @ topnpath ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 1 resource
[INFO] 
[INFO] --- maven-compiler-plugin:3.6.1:testCompile (default-testCompile) @ topnpath ---
[INFO] Nothing to compile - all classes are up to date
[INFO] 
[INFO] --- maven-surefire-plugin:2.12.4:test (default-test) @ topnpath ---
[INFO] Skipping execution of surefire because it has already been run for this configuration
[INFO] 
[INFO] --- maven-jar-plugin:3.0.2:jar (default-jar) @ topnpath ---
[INFO] Building jar: /work/top3paths/topnpath/target/topnpath-1.0-SNAPSHOT.jar
[INFO] ------------------------------------------------------------------------
[INFO] BUILD SUCCESS
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 2.499 s
[INFO] Finished at: 2017-04-24T11:59:59-07:00
[INFO] Final Memory: 20M/305M
[INFO] ------------------------------------------------------------------------
bash-3.2$ pwd
/work/top3paths/topnpath
bash-3.2$ java -jar target/topnpath-1.0-SNAPSHOT.jar  src/test/resources/files/test.txt 
/ -> subscribers -> filter
subscribers -> filter -> export
filter -> export -> /
export -> / -> subscribers
/ -> catalog -> edit
catalog -> edit -> /
edit -> / -> catalog
bash-3.2$