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

[nosretep]

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!

[mkristian]

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).

[nosretep]

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 :)