DRY up file locks.

lib/acts_as_indexed/storage.rb

@@ -90,10 +90,8 @@ def operate(operation, atoms)
 
         atoms = from_file.merge(atoms){ |k,o,n| o.send(operation, n) }
 
-        lock_file(path) do
-          write_file(path) do |f|
-            Marshal.dump(atoms,f)
-          end
+        write_file(path) do |f|
+          Marshal.dump(atoms,f)
         end
       end
     end
@@ -102,10 +100,8 @@ def update_record_count(delta)
       new_count = self.record_count + delta
       new_count = 0 if new_count < 0
 
-      lock_file(@size_path) do
-        write_file(@size_path) do |f|
-          f.write(new_count)
-        end
+      write_file(@size_path) do |f|
+        f.write(new_count)
       end
     end
 
@@ -150,14 +146,16 @@ def encode_character(char)
     end
 
     def write_file(file_path)
-      new_file = file_path.to_s
-      tmp_file = new_file + TEMP_FILE_EXTENSION
+      lock_file(file_path) do
+        new_file = file_path.to_s
+        tmp_file = new_file + TEMP_FILE_EXTENSION
 
-      File.open(tmp_file, 'w+') do |f|
-        yield(f)
-      end
+        File.open(tmp_file, 'w+') do |f|
+          yield(f)
+        end
 
-      FileUtils.mv(tmp_file, new_file)
+        FileUtils.mv(tmp_file, new_file)
+      end
     end
 
     # Borrowed from Rails' ActiveSupport FileStore. Also under MIT licence.