README.md

sensor-statistics

What is this app?

This is an simple tool which can scan given directory for *.csv files with temperature measurements from different sensors. This is expected format of those files:

sensor,temperature
s1,30
s2,30
s4,45
s3,NaN
s1,10

Some measurements may be not successful and in those cases instead of number in temperature field there is NaN There could be a lot of such files and measurements from one sensor can be in different files. This akka-actor based app reads all found files and make some statistics based on this data, which results in short summary.

This summary includes:

• Number of found files
• Number of measurements
• Number of failed measurements
• For any sensor there is an average, minimal and maximal temperature. All those measurements are sorted by average.

How to run it?

Before running a quick configuration is needed. There is an application.conf file in src/main/resourcesdirectory. It looks like this:

app {
  directoryPath = "src/test/resources/testDirectories/3-files-dir-example"
}

akka {
  loglevel = "INFO"
  stdout-loglevel = "OFF"
  loglevel = "OFF"
}

There you could specify in directoryPath field what directory should be scanned for *.csv files.

Optional configuration

Optionally you can also set up logger configuration in this files. By default logging is turned off. If you want to turn on logging, you need to remove those two lines:

stdout-loglevel = "OFF"
loglevel = "OFF"

so the effect would be:

app {
  directoryPath = "src/test/resources/testDirectories/3-files-dir-example"
}

akka {
  loglevel = "INFO"
}

Actual running sensor-statistics app

Go to main directory of this project and type:

sbt run

That's all! It while take a while to compile the project and you will have your sensor statistics in Standard Output.

Improvement ideas

• adding some library for streaming data with back-pressure feature
• rethink communication to adjust it to let it crash approach
• use types bigger than Int to store temperature