HTTP Streaming with Ruby on Rails running with JRuby (on Tomcat)

rubyonrails-talk
1

Is there any way to utilize Rails HTTP Streaming, the conventional way provided in Ruby on Rails 3.1, with JRuby (running in Tomcat)?

I did not expect this to work, but I’ll post the error message anyway:

NameError (uninitialized constant ActionView::StreamingTemplateRenderer::Fiber): /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/streaming_template_renderer.rb:71:in delayed_render' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/abstract_renderer.rb:38:in instrument’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/activesupport-3.2.1/lib/active_support/notifications.rb:123:in instrument' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/activesupport-3.2.1/lib/active_support/notifications/instrumenter.rb:20:in instrument’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/activesupport-3.2.1/lib/active_support/notifications.rb:123:in instrument' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/abstract_renderer.rb:38:in instrument’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/streaming_template_renderer.rb:70:in delayed_render' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/streaming_template_renderer.rb:56:in render_template’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/streaming_template_renderer.rb:23:in call' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_view/renderer/streaming_template_renderer.rb:23:in each’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/rack-1.4.1/lib/rack/chunked.rb:23:in each' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_dispatch/http/response.rb:44:in send’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/actionpack-3.2.1/lib/action_dispatch/http/response.rb:44:in each' /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/rack-1.4.1/lib/rack/body_proxy.rb:26:in send’ /path/to/tomcat/webapps/ROOT/WEB-INF/gems/gems/rack-1.4.1/lib/rack/body_proxy.rb:26:in method_missing' file:/path/to/tomcat/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.4.jar!/jruby/rack/response.rb:103:in send’ file:/path/to/tomcat/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.4.jar!/jruby/rack/response.rb:103:in write_body' file:/path/to/tomcat/webapps/ROOT/WEB-INF/lib/jruby-rack-1.1.4.jar!/jruby/rack/response.rb:50:in respond’

my controller looks like: class ApplicationController < ActionController::Base def index render :stream => true end end

Thanks in advance for any pointers. Thanks again!

2

this feature needs Fiber and that you have only with ruby 1.9.x, i.e. you need to use jruby in 1.9 mode. there is options setting in jruby- rack (or in warbler).

3

Yes, just found that. This now works.

warble.rb:

Warbler::Config.new do |config|

stuff before

config.webxml.jruby.compat.version = “1.9”

stuff after

end

In addition to the content, It spits out some random numbers and letters as it streams, but I guess I’ll find the answer for that in due time too :slight_smile: