This remote calculator provides a calculator accessible as a SOAP web service. The web-service is referred to as calculation-service. It is accompanied by a cli-client that can be used to interact with the calculation-service. To get started, you have to first build the project, then deploy the web-service before you can use the cli-client.

To better understand the design choices I made I am going to give a rough outline of the most important assumptions I made:\

1. The web service should be easily accessible to developers that do not know anything about the exact implementation (-> well known protocol is needed)
2. Calculations can are not limited to one mathematical operator per calculation, rather they can be arbitrarily long/complex
3. The calculator is used for calculations that are depictable with values of the double datatype.

The calculator can handle calculations involving the following mathematical operators:

+-*\

Decimal numbers are expressed with a dot.
It is possible to chain an arbitrary number of calculations, e.g.: 500+3*-29+400/-3*5+6000

All the provided instructions and the application were tested on a machine running GNU/Linux with the following software versions:
java 11 maven 3.8.6 docker 20.10.17

The project is build via maven. To build the server-side project run the following command from the projects root directory:

mvn -pl '!cli-client' clean install

(on Windows you might have to use " instead of ')

The cli-client can only be build once the calculation-service is running since it creates the sources for the SOAP endpoint during the maven build process, which necessitates that the service is running at that time.

The cli-client is build by running the following command from the cli-client directory, while the calculation-service is running:

mvn clean install

The calculation service can be deployed either directly on the host operating system, or via a provided Docker Container.

Run the following command from the projects root directory:

java -jar calculation-service/target/calculation-service-1.0-SNAPSHOT.jar

To deploy the service as a docker container, the container image has to be build first by running the following command from the projects root directory:

docker build -t example/calculation-service:1.0.0 ./calculation-service/.

To run the container execute the following command:

docker run -p 8080:8080 example/calculation-service:1.0.0

After building the cli-client module you have two options to use the cli-client application. Either you run it with the calculation you want to solve as argument, or you run it without arguments to enter a session where you can directly enter and solve as many successive calculations as you want.
To run the client with the calculation as argument, run the following from the projects root directory (modify the calculation to fit whatever calculation you want to solve):

java -jar cli-client/target/cli-client-1.0-SNAPSHOT.jar "500+3*-29+400/-3*5+6000"

To enter a session run the application without arguments:

java -jar cli-client/target/cli-client-1.0-SNAPSHOT.jar