GenServers are a concept directly taken from Elixir.
A GenServer is a process like any other Elixir process and it can be used to keep state, execute code asynchronously and so on. The advantage of using a generic server process (GenServer) implemented using this module is that it will have a standard set of interface functions and include functionality for tracing and error reporting. It will also fit into a supervision tree.
From the Elixir hexdocs
with GenServer from std:sync
with console from std:io
class Counter < GenServer
func! init(state)
put {:ok, state}
end
//If you want to use function matching, you have to explicetly state this
func! call(msg, from, state);
//We don't need ! since we already stated it above
func call(msg := :get, _, state)
put {:reply, state, state}
end
func! cast(msg, state);
func cast(msg := {:increment, number}, state)
put {:noreply, state + number}
end
end
try
var {:ok, ctrPid} = GenServer.start(Counter, 0)
send(ctrPid, {:increment, 10})
var nr = GenServer.call(ctrPid, :get)
console.out(nr) //Output: 10
catch(e)
//ignored
end
