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eventstore
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Event store using PostgreSQL for persistence.
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Files
lib/event_store/notifications/global_runner.ex
defmodule EventStore.Notifications.GlobalRunner do
use GenServer
def child_spec(child_child_spec) do
%{
id: __MODULE__,
start: {GenServer, :start_link, [__MODULE__, child_child_spec, []]}
}
end
def init(child_spec) do
Process.flag(:trap_exit, true)
{:ok, register(%{child_spec: child_spec})}
end
def handle_info({:DOWN, ref, :process, _, _}, %{ref: ref} = state) do
# Random delay until restart attempted
:timer.sleep(:random.uniform(1000))
{:noreply, register(state)}
end
defp name(%{child_spec: {_, {event_store, _, _, _}}}) do
Module.concat([event_store, __MODULE__])
end
defp register(state) do
case :global.register_name(name(state), self()) do
:yes -> start(state)
:no -> monitor(state)
end
end
defp start(%{child_spec: child_spec}) do
{:ok, pid} = Supervisor.start_link([child_spec], strategy: :one_for_one)
%{child_spec: child_spec, pid: pid}
end
defp monitor(%{child_spec: child_spec} = state) do
ref = Process.monitor(name(state))
%{child_spec: child_spec, ref: ref}
end
def terminate(reason, %{pid: pid}) do
Supervisor.stop(pid, reason)
end
def terminate(_reason, _state), do: nil
end