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commanded test example_domain bank_account account_balance_handler.ex
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test/example_domain/bank_account/account_balance_handler.ex

defmodule Commanded.ExampleDomain.BankAccount.AccountBalanceHandler do
@moduledoc false
use Commanded.Event.Handler,
application: Commanded.ExampleDomain.BankApp,
name: __MODULE__
alias Commanded.ExampleDomain.BankAccount.Events.BankAccountOpened
alias Commanded.ExampleDomain.BankAccount.Events.MoneyDeposited
alias Commanded.ExampleDomain.BankAccount.Events.MoneyWithdrawn
def init do
with {:ok, _pid} <- Agent.start_link(fn -> 0 end, name: __MODULE__) do
:ok
end
end
def handle(%BankAccountOpened{initial_balance: initial_balance}, _metadata) do
Agent.update(__MODULE__, fn _ -> initial_balance end)
end
def handle(%MoneyDeposited{balance: balance}, _metadata) do
Agent.update(__MODULE__, fn _ -> balance end)
end
def handle(%MoneyWithdrawn{balance: balance}, _metadata) do
Agent.update(__MODULE__, fn _ -> balance end)
end
def subscribed? do
try do
Agent.get(__MODULE__, fn _ -> true end)
catch
:exit, _reason -> false
end
end
def current_balance do
try do
Agent.get(__MODULE__, fn balance -> balance end)
catch
# Catch agent not started exits, return `nil` balance
:exit, _reason ->
nil
end
end
end