Implementation of web searcher based on requirements specified on page below https://s3.amazonaws.com/fieldlens-public/Website+Searcher.html

I. Overview

Application flows as follow (Thread Pool related calls are omitted for brevity)

Main -> load file with links
     -> extract Urls 
     -> create callback object (PageContentSearcher class) 
     -> creates Controller with injected callback  
     Controller -> create tasks and queue in thread pool
                -> uses HttpConnectionManager to create URL connection for generated links (HTTP protocol)
                -> uses UrlReader to load contents of the link
                -> uses callback (PageContentSearcher class) to search loaded contents for provided search terms 
                -> awaits for all tasks to be completed 
     -> uses ReportWriter to create and write results to results file (see VII for file format )       
     -> exits the program

II Building and running with installed JDK and Maven

(See item III. in case if java is not installed on this machine )
Prerequisites

• Java 8
• Maven 3.3+

Command to build

mvn clean package

Commands to run application

a) change directory from application root to target

cd target

b) execute java command

java -Xmx1g -jar website-searcher-1.0-SNAPSHOT.jar app.WebContentsSearcher

Commands to run tests

a) change directory from application root to target

cd target

b) execute java command to run all tests

java -cp test-classes;lib/takari-cpsuite-1.2.7.jar;lib/hamcrest-core-1.3.jar;lib/junit-4.12.jar;website-searcher-1.0-SNAPSHOT.jar org.junit.runner.JUnitCore RunAllTests 

III. Building and running without pre-installed JDK

Distribution of Java 8 must be located on PC Note: I was unable to add JDK distribution to the project since github rejects any files > 100 mb

Execute batch scripts

Command to build

build

EX: build [Full path to JDK distribution location on PC]

Commands to run application

run

EX: run [Full path to JDK distribution location on PC]

**Note: If [Full path to JDK distribution location on PC] contains spaces wrap path in double quotes

IV. App configuration

All parameters used in app.WebContentsSearcher configured in the file website-searcher\src\main\resources\config.properties

Configurable properties used:

1) To control log level
     logger.level=FINE

2) To specify a link to load Urls for processing 
     web.link.to.urls=https://s3.amazonaws.com/fieldlens-public/urls.txt

3) To specify a thread pool size
     pool.size=20

4) To specify a thread pool queue's capacity
     pool.queue.capacity=50

5) Sleep time of worker thread
     pool.worker.thread.sleep.time=10

6) Time to wait for thread pool termination
     pool.await.termination.sleep.time=60000

7) Terms to be used to search on downloaded pages  
     web.page.content.search.terms=Moved,document,Region,scrollbar

V. Results output

All matching results will be saved in the file: results_{timestamp}.txt

Ex: results_2018-09-18T10-15-30.150.txt

Links that failed to load will have details of exception

VI. Logging

Log file will be generated and saved in logs folder in the file websearcher_log_{timestamp}.txt with current timestamp

Ex: websearcher_log_2018-09-18T10-15-30.150.txt

VII. Sequence diagrams

Refer to directory ./diagrams to see various parts of an application flow