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JRuby Webwith JRuby Enterprise Web Application Development 2010 12 4 Akasaka.rbPhoto by Michael Pick

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Photo by Koichiro Ohba

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RubyistStruts

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Front ControllerActionServlet RequestProcessor Action processActionPerform process execute

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Front ControllerActionServlet RequestProcessor Action processActionPerform process execute

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JRubyRequestControllerStruts RequestProcessor Rubyclass RubyActionRequestProcessor def process_action_form req, res, mapping # do something end def process_action_perform req, res, action, form, mapping # do something endend

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JRubyRequestController.javapublic class JRubyRequestProcessor extends RequestProcessor {... @Override public void init(ActionServlet servlet, ModuleConfig moduleConfig) throws ServletException { super.init(servlet, moduleConfig);...

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struts-config.xml<struts-config>... <controller processorClass="n.r.s.JRubyRequestProcessor"> <set-property key="scriptPath" value="/WEB-INF/request-processor.rb" /> </controller>...</struts-config>

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JRubyRequestController#init()container = new ScriptingContainer( LocalContextScope.THREADSAFE );•• LocalContextScope.THREADSAFE Ruby

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JRubyRequestController#init()container.put("SERVLET_CONTEXT", servlet.getServletContext());• ServletContext SERVLET_CONTEXT

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JRubyRequestController#init()String path = moduleConfig.getControllerConfig() .getProperty("scriptPath");InputStream stream = servlet.getServletContext() .getResourceAsStream(path);EmbedEvalUnit unit = container.parse(stream, path);requestProcessor = unit.run();• scriptPath requestProcessor

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JRubyRequestController#init()String[] names = container.callMethod(requestProcessor, "public_methods", false, String[].class);supportedMethods = new HashSet<String>(Arrays.asList(names));• requestProcessor public_methods false

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JRubyRequestController.java@Overrideprotected ActionForward process...( HttpServletRequest request...) throws ...{ if (supportedMethods.contains("process...")){ return container.callMethod( requestProcessor, "process...", new Object[] { request, ... }, ActionForward.class); } else { return super.process... }...

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requestProcessor JRubyRequsetProcessor :IRubyObjectprocessActionPerform process_action_perform Ruby

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JRubyRequestProcessor

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SinatraRequestProcessorclass SinatraRequestProcessor def initialize @app = SinatraHelloAction.new end def process req, res servlet_env = ServletRackEnvironment.new req env = Rack::Handler::LazyEnv.new servlet_env status, header, body = @app.call env.to_hash res.setStatus(status) header.each do |k, v| res.setHeader(k, v) end out = res.getOutputStream out.print(body.join) endend

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Happy Hacking! and Good Carling!