| Name | Lines of code | Maintainability | Test coverage |
| java/src/com/rubyeventmachine/NullEmReactor.java | 111 | B 4 hrs | |
| java/src/com/rubyeventmachine/EventableDatagramChannel.java | 125 | A 1 hr | |
| lib/em/iterator.rb | 128 | B 5 hrs | |
| lib/em/protocols/postgres3.rb | 133 | A 3 hrs | |
| lib/em/protocols/httpclient.rb | 178 | D 2 days | |
| lib/em/resolver.rb | 187 | A 2 hrs | |
| ext/extconf.rb | 190 | B 4 hrs | |
| lib/em/protocols/memcache.rb | 201 | A 3 hrs | |
| lib/em/protocols/smtpclient.rb | 210 | B 5 hrs | |
| lib/em/connection.rb | 220 | C 1 day | |
| lib/jeventmachine.rb | 226 | A 35 mins | |
| java/src/com/rubyeventmachine/EventableSocketChannel.java | 289 | D 1 day | |
| lib/em/protocols/httpclient2.rb | 316 | C 1 day | |
| lib/em/protocols/smtpserver.rb | 319 | D 2 days | |
| java/src/com/rubyeventmachine/EmReactor.java | 478 | F 3 days | |
| lib/eventmachine.rb | 527 | F 4 days | |
| lib/em/pure_ruby.rb | 863 | F 3 days |