Begin to allow deferred app creation/loading

Some applications do not handle loading before forking
out-of-the-box very gracefully, this starts adding support
to build the Rack(-ish) application later in the process.

1 files changed, 5 insertions, 0 deletions

diff --git a/lib/unicorn.rb b/lib/unicorn.rb
index aad4c3d..fa2ebe8 100644
--- a/lib/unicorn.rb
+++ b/lib/unicorn.rb
@@ -86,6 +86,7 @@ module Unicorn
       config_listeners.each { |addr| listen(addr) }
       listen(Const::DEFAULT_LISTENER) if @listeners.empty?
       self.pid = @config[:pid]
+      build_app!
       spawn_missing_workers
       self
     end
@@ -529,5 +530,9 @@ module Unicorn
       listeners.map { |io| sock_name(io) }
     end
 
+    def build_app!
+      @app = @app.call if @app.respond_to?(:arity) && @app.arity == 0
+    end
+
   end
 end