tomros766 / pollution_server

little project developed during erlang and erlixir course on CS studies

Pollution server

An OTP application developed as a continuous lab classes project on Erlang and Elixir programming course.

The application provides server allowing to measure pollution levels from different measuring stations.

TODO

• Change comments from polish to english in polution module
• fix streams usage in pollution_data_stream module
• build hierarchy in src dir - group utils and training modules
• fix testing so they pass with simple rebar3 eunit command

Build

$ rebar3 compile
$ rebar3 shell

Test

The stacktrace print during tests is caused by an intentional server crash

$ rebar3 test

Modules description

Pollution

The module contains structure of data - records station and measurement. A single measurement station is represented as a map(station -> map(measurement -> value)).

The module contains also number of functions providing operations available on a monitor:

• adding a station
• adding a measurement value to a specific station
• removing a specific measurement
• getting a specific value depending on station and measurement parameters
• getting a mean of measurements of given type on a given station
• getting a daily mean from all stations
• getting a maximum value of given type and a station that has measured it
• getting a mean of measurements of given type on a given rectangular area

PollutionServer

A client wrapper around previous module - creates more friendly API and guarantees basic app protection Not used anymore - replaced by PollutionGenServer

PollutionGenServer

From the client perspective basicly identical funcionality as PollutionServer, but it implements gen_server behaviour and because of that it delivers better application protection.

PollutionData and PollutionDataStream

Purely training modules - they import data from pollution.csv file, perform operations on it and measure the time of execution The Stream solution needs fixing.