feat(GlobalDataCache): Try populating cache out of band on startup

mbta · Sep 25, 2024 · 011cfda · 011cfda
1 parent 4781abb
commit 011cfda
Showing 1 changed file with 9 additions and 2 deletions.
diff --git a/lib/mobile_app_backend/global_data_cache.ex b/lib/mobile_app_backend/global_data_cache.ex
@@ -132,14 +132,21 @@ defmodule MobileAppBackend.GlobalDataCache.Impl do
       update_ms: opts[:update_ms] || :timer.minutes(5)
     }
 
+    Process.send_after(self(), :recalculate, :timer.seconds(1))
+
     {:ok, state}
   end
 
   @impl GenServer
-  def handle_info(:recalculate, %State{} = state) do
+  def handle_info(:recalculate, %State{update_ms: update_ms} = state) do
     update_data(state.key)
 
-    Process.send_after(self(), :recalculate, state.update_ms)
+    if :persistent_term.get(state.key, nil) do
+      Process.send_after(self(), :recalculate, update_ms)
+    else
+      # no data yet, try again sooner
+      Process.send_after(self(), :recalculate, :timer.seconds(5))
+    end
 
     {:noreply, state}
   end