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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/registration/local_registry.ex
defmodule EventStore.Registration.LocalRegistry do
@moduledoc """
Pub/sub using Elixir's local `Registry` module, restricted to running on a
single node only.
"""
@behaviour EventStore.Registration
@doc """
Return the local supervisor child spec.
"""
@spec child_spec() :: [:supervisor.child_spec()]
@impl EventStore.Registration
def child_spec do
[
Supervisor.child_spec(
{
Registry,
keys: :duplicate, name: EventStore.PubSub, partitions: System.schedulers_online()
},
id: EventStore.PubSub
)
]
end
@doc """
Subscribes the caller to the given topic.
"""
@spec subscribe(
binary,
selector: (EventStore.RecordedEvent.t() -> any()),
mapper: (EventStore.RecordedEvent.t() -> any())
) :: :ok | {:error, term}
@impl EventStore.Registration
def subscribe(topic, opts) do
with {:ok, _} <- Registry.register(EventStore.PubSub, topic, opts) do
:ok
end
end
@doc """
Broadcasts message on given topic.
"""
@spec broadcast(binary, term) :: :ok | {:error, term}
@impl EventStore.Registration
def broadcast(topic, message) do
Registry.dispatch(EventStore.PubSub, topic, fn entries ->
for {pid, opts} <- entries do
notify_subscriber(pid, message, opts)
end
end)
end
defp notify_subscriber(_pid, {:events, []}, _), do: nil
defp notify_subscriber(pid, {:events, events}, opts) do
selector = Keyword.get(opts, :selector)
mapper = Keyword.get(opts, :mapper)
events = events |> filter(selector) |> map(mapper)
send(pid, {:events, events})
end
defp notify_subscriber(pid, message, _opts) do
send(pid, message)
end
defp filter(events, selector) when is_function(selector, 1), do: Enum.filter(events, selector)
defp filter(events, _selector), do: events
defp map(events, mapper) when is_function(mapper, 1), do: Enum.map(events, mapper)
defp map(events, _mapper), do: events
end