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event_bus

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Traceable, extendable and minimalist event bus implementation for Elixir with built-in event store and event watcher based on ETS

Retired package: Deprecated - Please prefer always latest minor
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event_bus lib event_bus services notification.ex
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lib/event_bus/services/notification.ex 

defmodule EventBus.Service.Notification do

  @moduledoc false



  require Logger

  alias EventBus.Manager.{Observation, Store, Subscription}

  alias EventBus.Model.Event



  @logging_level :info



  @doc false

  @spec notify(Event.t()) :: no_return()

  def notify(%Event{id: id, topic: topic} = event) do

    listeners = Subscription.subscribers(topic)

    :ok = Store.create(event)

    :ok = Observation.create({listeners, topic, id})



    notify_listeners(listeners, {topic, id})

  end



  @spec notify_listeners(list(), tuple()) :: no_return()

  defp notify_listeners(listeners, event_shadow) do

    for listener <- listeners, do: notify_listener(listener, event_shadow)

  end



  @spec notify_listener(tuple(), tuple()) :: no_return()

  @spec notify_listener(module(), tuple()) :: no_return()

  defp notify_listener({listener, config}, {topic, id}) do

    listener.process({config, topic, id})

  rescue

    error ->

      log(listener, error)

      Observation.mark_as_skipped({{listener, config}, topic, id})

  end



  defp notify_listener(listener, {topic, id}) do

    listener.process({topic, id})

  rescue

    error ->

      log(listener, error)

      Observation.mark_as_skipped({listener, topic, id})

  end



  @spec log(module(), any()) :: no_return()

  defp log(listener, error) do

    msg = "#{listener}.process/1 raised an error!\n#{inspect(error)}"

    Logger.log(@logging_level, msg)

  end

end