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commanded

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Use Commanded to build your own Elixir applications following the CQRS/ES pattern.

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commanded test event_store support subscriber.ex
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test/event_store/support/subscriber.ex 

defmodule Commanded.EventStore.Subscriber do

  use GenServer



  alias Commanded.EventStore.Subscriber



  defmodule State do

    defstruct [

      :event_store,

      :event_store_meta,

      :owner,

      :subscription,

      received_events: [],

      subscribed?: false

    ]

  end



  alias Subscriber.State



  def start_link(event_store, event_store_meta, owner) do

    state = %State{event_store: event_store, event_store_meta: event_store_meta, owner: owner}



    GenServer.start_link(__MODULE__, state)

  end



  def init(%State{} = state) do

    %State{event_store: event_store, event_store_meta: event_store_meta} = state



    {:ok, subscription} =

      event_store.subscribe_to(event_store_meta, :all, "subscriber", self(), :origin)



    {:ok, %State{state | subscription: subscription}}

  end



  def subscribed?(subscriber),

    do: GenServer.call(subscriber, :subscribed?)



  def received_events(subscriber),

    do: GenServer.call(subscriber, :received_events)



  def handle_call(:subscribed?, _from, %State{} = state) do

    %State{subscribed?: subscribed?} = state



    {:reply, subscribed?, state}

  end



  def handle_call(:received_events, _from, %State{} = state) do

    %State{received_events: received_events} = state



    {:reply, received_events, state}

  end



  def handle_info({:subscribed, subscription}, %State{subscription: subscription} = state) do

    %State{owner: owner} = state



    send(owner, {:subscribed, subscription})



    {:noreply, %State{state | subscribed?: true}}

  end



  def handle_info({:events, events}, %State{} = state) do

    %State{

      event_store: event_store,

      event_store_meta: event_store_meta,

      owner: owner,

      received_events: received_events,

      subscription: subscription

    } = state



    send(owner, {:events, events})



    state = %State{state | received_events: received_events ++ events}



    event_store.ack_event(event_store_meta, subscription, List.last(events))



    {:noreply, state}

  end

end