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eventstore
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Event store using PostgreSQL for persistence.
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lib/event_store/streams/stream.ex
defmodule EventStore.Streams.Stream do
@moduledoc """
An event stream
"""
use GenServer
require Logger
alias EventStore.Storage
alias EventStore.Streams.Stream
defstruct stream_uuid: nil
def start_link(stream_uuid) do
GenServer.start_link(__MODULE__, %Stream{
stream_uuid: stream_uuid
})
end
@doc """
Append the given list of events to the stream, expected version is used for optimistic concurrency
Each `Stream` is a GenServer process, so writes to a single logical stream will always be serialized.
"""
def append_to_stream(stream, expected_version, events) do
GenServer.call(stream, {:append_to_stream, expected_version, events})
end
def init(state) do
{:ok, state}
end
def handle_call({:append_to_stream, expected_version, events}, _from, %Stream{stream_uuid: stream_uuid} = state) do
reply = Storage.append_to_stream(stream_uuid, expected_version, events)
{:reply, reply, state}
end
end