Created
March 23, 2019 14:54
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defmodule Router do | |
def get do | |
end | |
def owner_id_currency_to_name(owner_id, currency_id) do | |
try do | |
String.to_existing_atom("wallet-#{owner_id}-#{currency_id}") | |
rescue | |
ArgumentError -> String.to_atom("wallet-#{owner_id}-#{currency_id}") | |
end | |
end | |
end | |
defmodule Wallet do | |
use GenServer | |
def start_link(name) do | |
GenServer.start_link(__MODULE__, 0, name: name) | |
end | |
def balance(name) do | |
GenServer.call(name, :balance) | |
end | |
def credit(name, value) do | |
GenServer.call(name, {:credit, value}) | |
end | |
def handle_call(:balance, _from, state) do | |
{:reply, state, state} | |
end | |
def handle_call({:credit, value}, _from, state) do | |
new_state = state + value | |
{:reply, new_state, new_state} | |
end | |
end | |
defmodule MySupervisor do | |
use DynamicSupervisor | |
def start_link(arg) do | |
DynamicSupervisor.start_link(__MODULE__, arg, name: __MODULE__) | |
end | |
def init(_arg), do: DynamicSupervisor.init(strategy: :one_for_one) | |
def ensure_running(name) do | |
spec = {Wallet, name} | |
DynamicSupervisor.start_child(__MODULE__, spec) | |
end | |
end | |
MySupervisor.start_link([]) | |
# in router | |
owner_id_1 = 1 | |
currency_id_1 = 2 | |
name_1 = Router.owner_id_currency_to_name(owner_id_1, currency_id_1) | |
MySupervisor.ensure_running(name_1) | |
IO.inspect(Wallet.balance(name_1)) | |
IO.inspect(Wallet.credit(name_1, 10)) | |
IO.inspect(Wallet.balance(name_1)) |
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