afterPayCodingExercise
AfterPay Coding Exercise
Languages and Tools
- Java
- Gradle
- JUnit
Info
- Expecting Java , Gradle
- Tested it on MacOS
- Gradle 6.3
- JVM: 13.0.2 (Oracle Corporation 13.0.2+8)
- src/main/resources has the input files
Linting
- google-java-format-gradle-plugin
Execute the task googleJavaFormat to format all *.java files in the project ./gradlew goJF
Execute the task verifyGoogleJavaFormat to verify that all *.java files are formatted properly ./gradlew verGJF
Concepts
- Using HashMap to store transactions for a specified hashed Credit Card .
- Go with Concrete classes , until there is a requirement to extract stuff into interfaces. - Dependency Inversion
Assumptions
- InMemory Operations
- No TimeZone Conversions required
- Data provided is valid.
- Sliding 24hr window is ongoing i.e. specified date and time onward
To Run the program
- ./gradlew run
- Check example.log for the logs
To Run the tests
-- ./gradlew clean test
-- Reports : at relative path build/reports/tests/test/index.html
-- CC with transactions under the threshold
-- CC with transactions over the threshold
Drawbacks of the Solution in its current form
- Have introduced a bit more complexity than required , inorder to make the solution extensible.
- Need to figure out how to improve the complexity in TransactionValidator from O(n*m)
- Need to add exception handling. (Time Constraint)