JRuby experiences

Small talk from BCNonRails monthly meeting

Transcript

1. JRuby experiences Hacks, Tips and Ideas
2. Me: Mauro Asprea Github: /brutuscat Twitter: @brutuscat E-mail: mauroasprea@gmail.com I am a Freelancer. I love to try and build things. I am Pragmatic
3. So JRuby Ruby running in the JVM Java running on Ruby JVM Integration components JVM Speed (sometimes) Limitations • Can't fork • Some gems using C extensions won't work
4. Java My experience with it was not that good. Keywords, patterns everywhere, it is not that easy to "discover" But it was "easy" to integrate things. Because is so Enterprise, it needs integration tools As long as you can program it... Many stuff are explained with XML. Which I HATE
5. Stuff: FTP Dropbox Connect to your Dropbox using ubiquitous FTP client. But there's no "good" FTP Server in Ruby Solution: • Use FTPServer from ASF • Programmatically be a virtual FTPServer
6. Stuff: FTP Dropbox Could it be built? FTP Server Virtual File System Dropbox Dropbox SDK
7. Stuff: FTP Dropbox Basically 3 things: • List files ◦ /metadata • Download ◦ /files GET • Upload ◦ /chunked_upload
8. Stuff: FTP Dropbox Solution: PipedInputStream (Upload) PipedOutputStream (Download) Celluloid (Glue) Hack the Dropbox SDK
9. Stuff: FTP Dropbox DEMO
10. Stuff: FTP Dropbox JAVA Ruby Interop WORKS!
11. Stuff: FTP Dropbox Code ends up messy because all the interop...
12. Questions? ???
13. Stuff 2: Camel-FIX-Websockets A "server" to push Financial Information (FIX) to the client Solution: • Camel as an integration framework • Quickfix/j as a FIX library • Jetty as a http server • Ruby instead of Java
14. Camel has GREAT docs and examples Enterprise Integration Patterns: It's ALL there Stuff 2: Camel-FIX-Websockets
15. Camel is GOOD: • Nice DSL for "dataflow" programming • Lots of components ◦ Quickfix ◦ Websocket ◦ Mongodb ◦ Everything? • "easy" to extend/fix using Ruby metaprogramming Stuff 2: Camel-FIX-Websockets
16. Stuff 2: Camel-FIX-Websockets JRuby caveats: • Because of its "reflective" nature, everything has to be a proper Java object obj.become_java!.newInstance For writing real Java classes
17. Questions? ???
18. Tips Use jbundler (Maven) for jar dependencies: Gemfile Jarfile • search.maven.org • mvnrepository.com
19. Tips • Naming issues? Wrap • Use PRY for "object discovery" • Add your directories in the classpath (log4j, configuration, etc) • For best performance wrap your Java objects instead of using Ruby objects (see JrJackson)
20. Ideas Embed-ness: • Apache James: smtp, pop3, imap, nntp, etc • Apache sshd: ssh client/server ◦ http://dylanv.org/2012/10/01/building-ssh-services- with-jruby-and-apache-mina/ • Jetty: http, spdy, websockets, servlet container • Jython, JS, anything?
21. Questions? ???
22. Me: Mauro Asprea Thank you! E-mail: mauroasprea@gmail.com I am a Freelancer. I love to try and build things. I am Pragmatic