uvkrishnasai / codingexercise Goto Github PK

#README

This repository is created to push the following BCBS coding exercises:

1. ENCODER/DECODER Algorithm
   
2. Employee Leave/Vacation tracking App

1. ENCODER/DECODER Algorithm

The code corresponding this exercise is present in the following location:
https://github.com/uvks/BCBS-CodingExcercise/tree/master/EncryptionAlgorithm

This program will only decode the given text.
Input text consists of upper/lower/special characters

Eclipse

(i) Initialized an array with length = max ascii value of upper/lower/special characters which is 126
(ii) From the given 3 encode-decode patterns, populated the encoded character ascii value index of the array with its corresponding decoded character ascii value.
(iii) Created an input text file with encoded text which needs to be decoded.
(iv) Run Ecruption.java to create Output.txt file in bin directory with the decoded text.
(v) Since the algorithm uses fixed length array using index to retrieve decoded characters, the runtime complexity is O(1) , and the space is 126 integer length array.
(vi) This Algorithm can be modified to fill out the empty spaces in the array for the characters which are absent in given 3 encode-decode patterns.

2. Employee Leave/Vacation tracking App

The code corresponding this exercise is present in the following location:
https://github.com/uvks/BCBS-CodingExcercise/tree/master/employee-vacation-app

Build an Application to keep track of vacation/leaves of employees

Used Spring boot to create the application.
Created an UI page to Create Employee, getEmplyeeById and getAllEmployees.
Used spring MVC design pattern.
Used Restful WebServices to expose the Services - createEmployee, getEmployeeByEmplId, getAllEmployees, addEmployeeVacation.
Used DAO Pattern to persist and retrieve data.
Used H2 Inmemory database to store the data.
Used Maven to build the project.
Used JSTL and spring form taglibs to diaplay the data.

Following are the design patterns used while developing the applciation:
(i) Factory pattern - To create and get DB connections.
(ii) Singleton pattern - To create single instance of service and dao implementations.
(iii) MVC pattern - To persist and retrieve data to and from UI, database.
(iv) Filter Pattern - To filter the input request URL and invoke corresponding contoller/servlet.
(v) Composite pattern - To treat employee and vacation as single object and display in the front-end.
(vi) Facade Pattern- At every stage, the interfaces or controller hides the complexities of the system.
(vii) Mediator pattern - Restful webservices as the mediator between Spring web controller and backEnd services.
(viii)Front Controller pattern - All the input requests are controlled by a single Front controller and dipatched to their corresponding servlets.
(ix) DAO pattern - To persist and retreive information to/from database.

Build the application using maven, e.g mvn clean install eclipse:eclipse
Run Application.java file
Enter the url in browser - http://localhost:8080/emp-vac-app/web/

After running the Application.java, if the link doens't work ->
Uncomment the code in the following 3 places of MyAppBeanConfiguration.java, rebuild the app and restart Application.java

1. //@EnableWebMvc
   
2. // extends WebMvcConfigurerAdapter
   
3. configureViewResolvers
   

I am able to finish the exercise. It is a working application (not fully tested), for time being did not create Value/model objects (Used entity objects instead) & did not implement some of the functionalities like adding vacations from UI, etc.

UI images are added to the wiki. https://github.com/uvks/BCBS-CodingExcercise/wiki