JRuby and You
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The "missing" slides from Charlotte JUG + RUG joint meeting for October 26, 2011. Keynote presentation is available upon request.
![Overloaded methods
obj = C.new
obj.method(5) # => "long"
obj.method(5.to_java(Java::int))
obj.java_send :method, [Java::int], 5
Wednesday, October 26, 11](https://image.slidesharecdn.com/charlotte-october2011-111027071830-phpapp01/85/JRuby-and-You-23-320.jpg)
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JRuby and You
- 1. JRuby and You Hiro Asari Engine Yard Wednesday, October 26, 11
- 2. History September 10, 2001 Source: Wikipedia Wednesday, October 26, 11
- 3. Wednesday, October 26, 11
- 4. Project Status • Current stable release: 1.6.5 (Oct 25, 2011) • Rails 3.1-compatible Wednesday, October 26, 11
- 5. What’s next in 1.7? • JSR 292 (a.k.a. invokedynamic) support • Improved Ruby 1.9 support Wednesday, October 26, 11
- 6. What’s in it for Java programmers? • REPL • Testing frameworks • Fun Wednesday, October 26, 11
- 7. What’s in it for Rubyists? • Real threads • No more GIL • Mature garbage collector • Easy deployment Wednesday, October 26, 11
- 8. Try JRuby http://jruby.org/tryjruby Wednesday, October 26, 11
- 9. Getting JRuby wget http://bit.ly/jruby_bin_165 | tar xzvf - export PATH=$PATH:$PWD/jruby-1.6.5/bin Wednesday, October 26, 11
- 10. jruby -S irb Wednesday, October 26, 11
- 11. Java Integration require 'java' Wednesday, October 26, 11
- 12. Loading JAR require 'example.jar' Wednesday, October 26, 11
- 13. Importing Java Class StringBuffer = java.lang.StringBuffer sb = StringBuffer.new "foo" Wednesday, October 26, 11
- 14. java_import java_import java.lang.StringBuffer java_import 'java.lang.StringBuffer' Wednesday, October 26, 11
- 15. Static methods java.lang.System.currentTimeMillis java.lang.System.current_time_millis Wednesday, October 26, 11
- 16. Static Fields java_import java.util.logging.Logger java_import java.util.loggin.Level Logger.global.log Level::SEVERE, "…" Wednesday, October 26, 11
- 17. Constructor URL.new 'http://engineyard.com' URL.new 'http', 'engineyard.com', '/' Wednesday, October 26, 11
- 18. Instance methods #given # void setPrice(int): car.setPrice(2000) car.price = 2000 # int getPrice() car.price Wednesday, October 26, 11
- 19. Explicit Coercion measurement = 5 measurement.to_java Wednesday, October 26, 11
- 20. Overloaded methods public class C { public static String method(String s) { return "String"; } public static String method(long l) { return "long"; } } Wednesday, October 26, 11
- 21. Overloaded methods obj = C.new obj.method("foo") # => "String" obj.method(5) # => "long" Wednesday, October 26, 11
- 22. Overloaded methods public class C { public String method(int i) { return "int"; } public String method(long l) { return "long"; } } Wednesday, October 26, 11
- 23. Overloaded methods obj = C.new obj.method(5) # => "long" obj.method(5.to_java(Java::int)) obj.java_send :method, [Java::int], 5 Wednesday, October 26, 11
- 24. Java Interfaces callable = java.util.concurrent.Executors.callable do puts "foo" end callable.call Wednesday, October 26, 11
- 25. Complex Example with Akka Java source: http://bit.ly/lTClmr Ruby source: https://gist.github.com/1013227 http://www.engineyard.com/blog/2011/using- java-from-ruby-with-jruby-irb/ Wednesday, October 26, 11
- 26. GUI Redcar http://redcareditor.com/ Wednesday, October 26, 11
- 27. Grafting Rails into Spring MVC Wednesday, October 26, 11
- 28. Pet Clinic • Example database- backed web app for Spring framework Wednesday, October 26, 11
- 29. Requests JRuby / /vets /rack/ Java/ Spring App Wednesday, October 26, 11
- 30. Adding Route diff --git a/src/main/webapp/WEB-INF/jsp/vets.jsp b/src/main/webapp/WEB-INF/jsp/vets.jsp index cff2154..0d99817 100644 --- a/src/main/webapp/WEB-INF/jsp/vets.jsp +++ b/src/main/webapp/WEB-INF/jsp/vets.jsp @@ -23,7 +23,7 @@ <table class="table-buttons"> <tr> <td> - <a href="<spring:url value="/vets.xml" htmlEscape="true" />">View as XML</a> + <a href="<spring:url value="/rack/vets.xml" htmlEscape="true" />">View as XML</a> </td> </tr> </table> Wednesday, October 26, 11
- 31. Cucumber • http://cukes.info • Testing framework for describing software behavior in plain English Wednesday, October 26, 11
- 32. Cucumber Feature: Pets Scenario: Edit Pet Given I am on the owners search page And I press "Find Owners" And I follow "George Franklin" And I follow "Edit Pet" When I fill in "Name" with "Leoni" And press "Update Pet" Then I should see "Leoni" Wednesday, October 26, 11
- 33. Cucumber test Stand by while Tomcat finishes booting... Using the default profile... ............................................................F-............. (::) failed steps (::) expected: /xml/, got: "text/html;charset=utf-8" (using =~) Diff: @@ -1,2 +1,2 @@ -/xml/ +text/html;charset=utf-8 (RSpec::Expectations::ExpectationNotMetError) org/jruby/RubyProc.java:268:in `call' ./features/step_definitions/xml_json_steps.rb:12:in `(root)':in `/^I should see an XML document$/' features/vets.feature:6:in `Then I should see an XML document' Failing Scenarios: cucumber features/vets.feature:3 # Scenario: View vets as XML 13 scenarios (1 failed, 12 passed) 75 steps (1 failed, 1 skipped, 73 passed) 0m7.709s rake aborted! Cucumber failed Wednesday, October 26, 11
- 34. diff --git a/pom.xml b/pom.xml index 9e22f83..0810701 100644 --- a/pom.xml +++ b/pom.xml @@ -211,6 +211,18 @@ <scope>provided</scope> </dependency> + <!-- JRuby and JRuby-Rack --> + <dependency> + <groupId>org.jruby</groupId> + <artifactId>jruby-complete</artifactId> + <version>1.6.0</version> + </dependency> + <dependency> + <groupId>org.jruby.rack</groupId> + <artifactId>jruby-rack</artifactId> + <version>1.0.8</version> + </dependency> + <!-- Test dependencies --> <dependency> <groupId>org.junit</groupId> Wednesday, October 26, 11
- 35. diff --git a/src/main/webapp/WEB-INF/web.xml b/src/main/webapp/WEB-INF/web.xml index 8d02684..60ed6cb 100644 --- a/src/main/webapp/WEB-INF/web.xml +++ b/src/main/webapp/WEB-INF/web.xml @@ -87,6 +87,21 @@ <listener> <listener-class>org.springframework.web.context.ContextLoaderListener</listener-class> </listener> + + <listener> + <listener-class>org.jruby.rack.RackServletContextListener</listener-class> + </listener> + + <servlet> + <servlet-name>rack</servlet-name> + <servlet-class>org.jruby.rack.RackServlet</servlet-class> + </servlet> + + <servlet-mapping> + <servlet-name>rack</servlet-name> + <url-pattern>/rack/*</url-pattern> + </servlet-mapping> + <!-- Defines the 'default' servlet (usually for service static resources). Wednesday, October 26, 11
- 36. diff --git a/src/main/webapp/WEB-INF/lib/app.rb b/src/main/webapp/WEB-INF/lib/ app.rb index 6ab5b3c..4398fb4 100644 --- a/src/main/webapp/WEB-INF/lib/app.rb +++ b/src/main/webapp/WEB-INF/lib/app.rb @@ -1,6 +1,33 @@ require 'builder' require 'erb' +require 'spring_helpers' + +helpers do + include Spring +end get '/rack/' do '<h1>Sinatra</h1>' end + +get '/rack/vets.xml' do + content_type 'application/vnd.petclinic+xml' + builder do |xml| + xml.instruct! + xml.vets do + clinic.vets.each do |vet| + xml.vetList do + xml.id vet.id + xml.firstName vet.firstName + xml.lastName vet.lastName + vet.specialties.each do |spec| + xml.specialties do + xml.id spec.id + xml.name spec.name + end + end + end + end + end + end +end Wednesday, October 26, 11
- 37. Requests / /vets JRuby /owners Java/ / /vets /owners /1/pets Spring App Wednesday, October 26, 11
- 38. diff --git a/src/main/webapp/WEB-INF/web.xml b/src/main/webapp/WEB-INF/web.xml index 60ed6cb..f64b34d 100644 --- a/src/main/webapp/WEB-INF/web.xml +++ b/src/main/webapp/WEB-INF/web.xml @@ -92,16 +92,6 @@ <listener-class>org.jruby.rack.RackServletContextListener</listener-class> </listener> - <servlet> - <servlet-name>rack</servlet-name> - <servlet-class>org.jruby.rack.RackServlet</servlet-class> - </servlet> - - <servlet-mapping> - <servlet-name>rack</servlet-name> - <url-pattern>/rack/*</url-pattern> - </servlet-mapping> - <!-- Defines the 'default' servlet (usually for service static resources). @@ -162,6 +152,16 @@ <url-pattern>/</url-pattern> </servlet-mapping> + <filter> + <filter-name>RackFilter</filter-name> + <filter-class>org.jruby.rack.RubyFirstRackFilter</filter-class> + </filter> + + <filter-mapping> + <filter-name>RackFilter</filter-name> + <url-pattern>/*</url-pattern> + </filter-mapping> + <filter> <filter-name>httpMethodFilter</filter-name> <filter-class>org.springframework.web.filter.HiddenHttpMethodFilter</filter-class> Wednesday, October 26, 11
- 39. The Book http://pragprog.com/book/ jruby/using-jruby 25% off for one week only: http://bit.ly/vd4Mhj Wednesday, October 26, 11
- 40. Engine Yard 500 free hours http://engineyard.com Wednesday, October 26, 11
- 41. Questions? Twitter @hiro_asari G+ http://gplus.to/hiroasari LinkedIn http://linkedin.com/in/hiroasari [email protected] [email protected] http://github.com/banzaiman http://www.flickr.com/photos/42033648@N00/372887164 Wednesday, October 26, 11