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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.
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test/example_domain/bank_account/bank_account_batch_handler.ex
defmodule Commanded.ExampleDomain.BankAccount.BankAccountBatchHandler do
@moduledoc false
use Commanded.Event.Handler,
application: Commanded.ExampleDomain.BankApp,
name: __MODULE__,
start_from: :origin,
batch_size: 3
alias Commanded.ExampleDomain.BankAccount.Events.BankAccountOpened
def init do
case Agent.start_link(fn -> %{prefix: "", accounts: []} end, name: __MODULE__) do
{:ok, _} -> :ok
{:error, {:already_started, _}} -> :ok
_ -> {:error, :unable_to_start}
end
end
def before_reset do
Agent.update(__MODULE__, fn state -> %{state | accounts: []} end)
end
def handle_batch([]), do: :ok
def handle_batch([{%BankAccountOpened{} = event, _metadata} | rest]) do
%BankAccountOpened{account_number: account_number} = event
Agent.update(__MODULE__, fn %{prefix: prefix, accounts: accounts} = state ->
%{state | accounts: accounts ++ [prefix <> account_number]}
end)
handle_batch(rest)
end
def subscribed? do
try do
Agent.get(__MODULE__, fn _ -> true end)
catch
:exit, _reason -> false
end
end
def change_prefix(prefix) do
try do
Agent.update(__MODULE__, fn s -> %{s | prefix: prefix} end)
catch
:exit, _reason ->
nil
end
end
def current_accounts do
try do
Agent.get(__MODULE__, fn %{accounts: accounts} -> accounts end)
catch
# catch agent not started exits, return `nil` balance
:exit, _reason ->
nil
end
end
end