Refactor temp directory methods into helper module

lib/directory_helper.rb

@@ -0,0 +1,22 @@
+module DirectoryHelper
+
+  def tmp_directory(prefix)
+    directory_cache[prefix] ||= begin
+      f = File.join( Rails.root, 'tmp', Time.now.strftime("#{prefix}%Y%m%d%H%M%S") )
+      FileUtils.mkdir_p(f) unless Dir[f].present?
+      f
+    end
+  end
+
+  def remove_tmp_directory(prefix)
+    tmp_directory_name = directory_cache[prefix] || ''
+    directory_cache.delete(prefix)
+    FileUtils.rm_rf(tmp_directory_name) if Dir[tmp_directory_name].present?
+  end
+
+  private
+  def directory_cache
+    @directory_cache ||= {}
+  end
+
+end