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Event store using PostgreSQL for persistence.
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lib/event_store/streams/all_stream.ex
defmodule EventStore.Streams.AllStream do
@moduledoc """
A logical stream containing events appended to all streams
"""
use GenServer
require Logger
alias EventStore.{RecordedEvent,Storage}
alias EventStore.Streams.AllStream
alias EventStore.Subscriptions
defstruct serializer: nil
def start_link(serializer) do
GenServer.start_link(__MODULE__, %AllStream{serializer: serializer}, name: __MODULE__)
end
def read_stream_forward(start_event_id \\ 0, count \\ nil) do
GenServer.call(__MODULE__, {:read_stream_forward, start_event_id, count})
end
def subscribe_to_stream(subscription_name, subscriber) do
GenServer.call(__MODULE__, {:subscribe_to_stream, subscription_name, subscriber})
end
def init(%AllStream{} = state) do
{:ok, state}
end
def handle_call({:read_stream_forward, start_event_id, count}, _from, %AllStream{serializer: serializer} = state) do
reply = read_storage_forward(start_event_id, count, serializer)
{:reply, reply, state}
end
def handle_call({:subscribe_to_stream, subscription_name, subscriber}, _from, %AllStream{} = state) do
reply = Subscriptions.subscribe_to_all_streams(self, subscription_name, subscriber)
{:reply, reply, state}
end
defp read_storage_forward(start_event_id, count, serializer) do
{:ok, recorded_events} = Storage.read_all_streams_forward(start_event_id, count)
events = Enum.map(recorded_events, fn event -> deserialize_recorded_event(event, serializer) end)
{:ok, events}
end
defp deserialize_recorded_event(%RecordedEvent{data: data, metadata: metadata, event_type: event_type} = recorded_event, serializer) do
%RecordedEvent{recorded_event |
data: serializer.deserialize(data, type: event_type),
metadata: serializer.deserialize(metadata, [])
}
end
end