Felix HTTP - Paving the road to the future
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This document discusses Felix HTTP, a modular web application framework. It provides an overview of the current state, available extensions, and a new specification. The new specification standardizes the whiteboard pattern and adds support for asynchronous servlets, filters, listeners, custom error pages, WebSockets, SPDY, and the Servlet 3.0 API. Future work includes finalizing the new specification and improving support for technologies like SPDY and WebSockets.
![Example
Dictionaryprops=newHashtable();
props.put("osgi.http.whiteboard.filter.pattern","/*");
props.put("osgi.http.whiteboard.filter.dispatcher",
newString[]{"REQUEST","INCLUDE","FORWARD"});
context.registerService(Filter.class.getName(),newSecurityFilter(),props);](https://image.slidesharecdn.com/felixhttp-pavingtheroadtothefuture-140410110840-phpapp01/85/Felix-HTTP-Paving-the-road-to-the-future-29-320.jpg)
![Example
Dictionaryprops=newHashtable();
props.put("osgi.http.whiteboard.servlet.errorPage",
newString[]{"500","java.io.IOException"});
context.registerService(Servlet.class.getName(),newMyErrorHandlingServlet(),props);](https://image.slidesharecdn.com/felixhttp-pavingtheroadtothefuture-140410110840-phpapp01/85/Felix-HTTP-Paving-the-road-to-the-future-33-320.jpg)
![Example
//Client-side
varwsConn=newWebSocket("ws://"+window.location.host+"/servlet",["my-protocol"]);
wsConn.onmessage=function(event){
vardata=event.data;
//dosomethingwithdata
}
//Server-side,registeredat"/servlet"
classMyWebSocketServletextendsWebSocketServlet{
publicWebSocketdoWebSocketConnect(HttpServletRequestrequest,Stringprotocol){
if("my-protocol".equals(protocol)){
returnnewWebSocket.OnTextMessage(){
publicvoidonOpen(Connectionconn){}
publicvoidonClose(intcode,Stringreason){}
publicvoidonMessage(Stringdata){}
};
}
returnnull;
}
}](https://image.slidesharecdn.com/felixhttp-pavingtheroadtothefuture-140410110840-phpapp01/85/Felix-HTTP-Paving-the-road-to-the-future-36-320.jpg)
Felix HTTP - Paving the road to the future
- 2. Jan Willem Janssen Software architect at Luminis Technologies Currently working on PulseOn and Amdatu Committer and PMC member at Apache Felix and Apache ACE
- 3. Marcel Offermans Director at Luminis Technologies, Fellow at Luminis Currently working on Amdatu Apache Member, Committer and PMC member at Apache ACE and Apache Felix
- 4. Agenda Modular Web Applications Current State Available Extensions The New Specification New extensions Future Work Wrap Up
- 6. Modular Architectures High Cohesion, Low Coupling Separation of Concerns Maintainable Code Reusable, Composable
- 7. Deployments Compose modules into different deployments Low bandwidth by just sending changed modules Fast deployments by being able to update running applications
- 11. ResourceshttpService.registerResources("/site","/resources",null/*httpContext*/); $catresources/hello HelloApacheConworld,I'mastaticresource! request a static resource called hello ...
- 12. HttpContext Provides secure access to servlets and resources. Layer of abstraction for resource loading. publicinterfaceHttpContext{ booleanhandleSecurity(HttpServletRequestrequest, HttpServletResponseresponse); URLgetResource(Stringname); StringgetMimeType(Stringname); }
- 13. Web Application Specification Part of the OSGi Enterprise Specification, chapter 128. Web Application Bundle (WAB) are extended Java EE WAR files. They have optional JSP support. Integration with OSGi BundleContextand service registry.
- 15. Whiteboard don't call us, we'll call you! Register your Servletin the service registry and add a property called aliascontaining its endpoint. For more information: http://www.osgi.org/wiki/uploads/Links/whiteboard.pdf
- 16. Filters Just like Servlets, these can be registered whiteboard style or use explicit registration: the ExtHttpServiceservice from Felix HTTP the WebContainerservice from PAX Web
- 17. Amdatu Web Resources of the open source project (Apache Licensed).Part Amdatu.org X-Web-Resource-Version:1.1 X-Web-Resource:/amdatu-resources;resources X-Web-Resource-Default-Page:index.html,/doc=javadoc.html Include-Resource:resources=resources/basic
- 18. Demo request a static resource called /amdatu‑resources ...
- 19. Amdatu Web REST Extensive support for based on industry standards.REST endpoints JAX-RS based annotation support. Includes support for Jackson mappings. Self-documenting endpoints with Swagger.
- 21. Self- documenting Endpoints Swagger is a library that creates documentation for endpoints based on JAX-RS annotations plus some extras. Go to Swagger documentation
- 23. Whiteboard No longer an extension No explicit registration Specify HttpService to be used
- 25. (A)synchronous Servlets Servlet 3.0 API Support wildcard one or more patterns Process work outside the servlet lifecycle
- 32. Custom Error Pages By error code By exception
- 34. New extensions
- 35. WebSockets “Real-time” Binary or text-based Two-way communication RFC 6455
- 37. Demo Multi-user Etch A Sketch
- 38. SPDY Let's make the web faster Session layer on top of SSL Reduce bandwidth & lower latency Push multiple resources in a request Basis of HTTP 2.0
- 39. Application Session Presentation Transport How SPDY fits in the OSI layer model.
- 40. SPDY vs WebSockets SPDY WebSockets Goal optimize HTTP 2-way communication Upgradeability transparent needs works Secure? ✔ (mandatory) ✔ (if needed) Two-way? ✔ / ✘ ✔ Multiplexed ✔ ✘ Prioritized ✔ ✘
- 42. Future Work
- 43. Finalize support for new HttpService specification Upgrade to Jetty 9 Allow “new style” WebSockets (JSR 356) to be used Improved support for SPDY
- 44. Wrap Up
- 45. New/updated specifications New features, functionality & improvements Available extensions Build modular web applications
- 46. Questions?