Server should also sweep cache

lib/propshaft/load_path.rb

@@ -44,13 +44,9 @@ def cache_sweeper
     @cache_sweeper ||= begin
       exts_to_watch  = Mime::EXTENSION_LOOKUP.map(&:first)
       files_to_watch = Array(paths).collect { |dir| [ dir.to_s, exts_to_watch ] }.to_h
-      mutex = Mutex.new
 
       Rails.application.config.file_watcher.new([], files_to_watch) do
-        mutex.synchronize do
-          clear_cache
-          seed_cache
-        end
+        clear_cache
       end
     end
   end
@@ -85,10 +81,6 @@ def clear_cache
       @cached_asset_paths_by_glob = nil
     end
 
-    def seed_cache
-      assets_by_path
-    end
-
     def dedup(paths)
       paths   = Array(paths).map { |path| Pathname.new(path) }
       deduped = [].tap do |deduped|

lib/propshaft/server.rb

@@ -7,6 +7,7 @@ def initialize(assembly)
   end
 
   def call(env)
+    Rails.application.assets.load_path.cache_sweeper.execute_if_updated
     path, digest = extract_path_and_digest(env)
 
     if (asset = @assembly.load_path.find(path)) && asset.fresh?(digest)