This is a java application for authorizing banking transaction based on a set predefined rules.

The program receives json lines as inputs that are read from operations file at "/src/main/java/resources/operations". As output, the program provides json lines for each given input — imagine this as a stream of events arriving at an authorizer consumer.

• Java (OpenJDK 15+) (instruction)
• Maven (3.6.3+) (instructions)
• Your favorite IDE (the recommended one is IntelliJ Community Edition).

In this project's root directory, run:

mvn clean install

AuthorizerApplication is the project's main file. So, in order to run application, execute:

mvn exec:java -Dexec.mainClass=transaction.authorizer.AuthorizerApplication

The application reads all transaction inputs inside "/src/main/java/resources/operations" , and produces a output file in the project's root directory.

If you want to test application against other transaction inputs, feel free to change content inside "/src/main/java/resources/operations", and re-run application.

You may run the project by executing AuthorizerApplication via Intellij as follows:

Let's talk about the structure or architecture of the application. The project has been separated into the following layers:

1. Main Application (AuthorizerApplication) starts application, and setups input and output files.
2. Consumers receive and handle transaction events.
3. Services process transaction events by applying a set of predefined rules, and producing an output for each event.
4. Models represent the domain that we're using within the application (e.g., Account, and Transaction).