Simple demonstration of supervision by setting up a Math.Calculate module that has a method divide. If a divide by zero occurs then the process gets restarted.
In mix.exs, the Math supervisor gets kicked off via:
def application do
[applications: [:logger],
mod: {Math, []}
]
end
In the Math supervisor, it kicks off and supervises the Math.Calculate worker process.
Thus, when you fire up iex -S mix it'll start up the Math supervisor and the Math.Calculate worker process for you!
So then I can call the divide function:
> Math.Calculate.divide(10,2)
5.0
:ok
> Math.Calculate.divide(34,3)
11.333333333333334
:ok
> Math.Calculate.divide(34,0)
A BIG UGLY ERROR MESSAGE... BUT LITTLE DID YOU KNOW THE PROCESS WAS RESTARTED AND LIVES!
> Math.Calculate.divide(34,2)
17.0
:OK
