Extract the logic closing the destinations

This will be useful to dry #44.

lib/kiba/runner.rb

@@ -13,8 +13,9 @@ def run(control)
       process_rows(
         to_instances(control.sources),
         to_instances(control.transforms, true),
-        to_instances(control.destinations)
+        destinations = to_instances(control.destinations)
       )
+      close_destinations(destinations)
       # TODO: when I add post processes as class, I'll have to add a test to
       # make sure instantiation occurs after the main processing is done (#16)
       run_post_processes(control)
@@ -28,6 +29,12 @@ def run_post_processes(control)
       to_instances(control.post_processes, true, false).each(&:call)
     end
 
+    def close_destinations(destinations)
+      destinations
+      .find_all { |d| d.respond_to?(:close) }
+      .each(&:close)
+    end
+
     def process_rows(sources, transforms, destinations)
       sources.each do |source|
         source.each do |row|
@@ -41,7 +48,6 @@ def process_rows(sources, transforms, destinations)
           end
         end
       end
-      destinations.find_all { |d| d.respond_to?(:close) }.each(&:close)
     end
 
     # not using keyword args because JRuby defaults to 1.9 syntax currently