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Event store using PostgreSQL for persistence.
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lib/event_store/streams/supervisor.ex
defmodule EventStore.Streams.Supervisor do
@moduledoc """
Streams supervisor provides access to a single stream process per logical stream by its stream uuid
"""
use Supervisor
alias EventStore.Registration
alias EventStore.Streams.Stream
def start_link(serializer) do
Supervisor.start_link(__MODULE__, serializer, name: __MODULE__)
end
@doc """
Open a stream by starting a `Stream` process, or return the pid of an already started process
"""
@spec open_stream(String.t) :: {:ok, pid} | {:error, term()}
def open_stream(stream_uuid) do
name = Stream.name(stream_uuid)
case Registration.start_child(name, __MODULE__, [stream_uuid]) do
{:ok, stream} -> {:ok, stream}
{:ok, stream, _info} -> {:ok, stream}
{:error, {:already_started, stream}} -> {:ok, stream}
reply -> reply
end
end
def close_stream(stream_uuid), do: Stream.close(stream_uuid)
@doc false
def init(serializer) do
children = [
worker(Stream, [serializer], restart: :temporary)
]
supervise(children, strategy: :simple_one_for_one)
end
end