Effective Web Application Development with Apache Sling
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This document discusses an overview of Apache Sling, including quick facts about its history and community, its conceptual foundations as a REST-based and content-driven framework powered by OSGi and scripting, its main building blocks like resource providers and JCR, and how to build Sling applications by modeling content in JCR, accessing resources, using templating with Sightly, extensions, deployment and tooling.
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Effective Web Application Development with Apache Sling
- 1. http://robert.muntea.nu @rombert Effective Web Application Development with Apache Sling Effective Web Application Development with Apache Sling Robert Munteanu ApacheCon Core Europe 2015
- 2. http://robert.muntea.nu @rombert Who I am $DAYJOB Adobe Experience Manager Apache Sling Apache Jackrabbit Apache Felix FOSS Apache Sling MantisBT Mylyn Connector for MantisBT Mylyn Connector for Review Board Speaker.currentSpeaker().interrupt();
- 3. http://robert.muntea.nu @rombert Agenda ● Quick facts and figures ● Conceptual foundations ● Building blocks ● Building Sling applications
- 4. http://robert.muntea.nu @rombert Quick facts and figures Quick facts and figures
- 5. http://robert.muntea.nu @rombert Quick facts and figures 2007 incubation 2009 TLP 2014 Version 7 200x Pre-Apache
- 6. http://robert.muntea.nu @rombert High-level View of the Code Source: OpenHub
- 7. http://robert.muntea.nu @rombert Level of activity Source: OpenHub Source: status.apache.org
- 10. http://robert.muntea.nu @rombert Conceptual foundations REST-based Content-driven OSGi-powered Scripting insideApache
- 11. http://robert.muntea.nu @rombert Apache Open Source Project 4 Aries 1 ServiceMix 7 Commons 17 Felix 3 Geronimo 6 Jackrabbit 1 Derby 2 Tika
- 14. http://robert.muntea.nu @rombert Content-driven - jcr:primaryType = app:asset - jcr:title = Some Cat - jcr:description = A longer description of this picture of a cat - jcr:created = 2014-06-03T00:00:00.000+02:00 - jcr:lastUpdated = 2014-06-03T11:00:00.000+02:00 - tags = [Animal, Cat, Color] - width = 400 - height = 600 some-cat.jpg
- 17. http://robert.muntea.nu @rombert OSGi powered ● Provision and deploy bundles ● Configure, register and lookup services ● Eventing ● Web Console
- 19. http://robert.muntea.nu @rombert Serving a request GET /blog/welcome.html /blog/welcome myblog/blog.groovy ???
- 20. http://robert.muntea.nu @rombert Resource Types blog [blogapp/listing] hello-world images jcr:content [blogapp/blog/content] some-cat.jpg other-cat.jpg
- 21. http://robert.muntea.nu @rombert Script resolution GET /blog.html Type: blogapp/listing Extension: html Method: GET /libs/blogapp/listing/html.jsp @SlingServlet(resourceTypes=”blogapp/listing”,...) /libs/blogapp/listing.jsp
- 22. http://robert.muntea.nu @rombert Request selectors GET /blog.rss.xml Type: blogapp/listing Extension: xml Selector: rss Method: GET /libs/blogapp/listing/rss.html
- 23. http://robert.muntea.nu @rombert Resource Providers JCR MongoDB FS Cassandra / /content/ /content/comments /logs
- 25. http://robert.muntea.nu @rombert JCR Implementations Apache Jackrabbit Oak
- 26. http://robert.muntea.nu @rombert Building Sling Applications Building Sling Applications
- 27. http://robert.muntea.nu @rombert JCR Modeling images File uploadsome-cat.jpg renditions small.jpg ripple.jpg Observation annotations initial-review ACLs
- 28. http://robert.muntea.nu @rombert JCR Modeling etc rendition ripple - orientation = /etc/rendition/ripple/options↵ /orientation/vertical - antialiasing = true - edges = /etc/rendition/ripple/options/↵ edges/wrap - wave type = /etc/rendition/ripple/options/↵ wave_type/simple - period = 20 - amplitude = 5
- 29. http://robert.muntea.nu @rombert Everything is a Resource Everything is a resource
- 30. http://robert.muntea.nu @rombert Reading from the repository @SlingServlet(resourceTypes = "blogapp/listing", extensions = "xml", methods = "GET") public class RSSFeedServlet extends SlingSafeMethodsServlet { @Override protected void doGet(SlingHttpServletRequest request, SlingHttpServletResponse response) throws ServletException, IOException { // actual implementation } }
- 31. http://robert.muntea.nu @rombert Reading from the repository Resource res = request.getResource(); ValueMap properties = ↵ res.adaptTo(ValueMap.class); String title = properties.get(“jcr:title”,↵ “Missing”); Post post = res.adaptTo(Post.class); title = post.getTitle();
- 32. http://robert.muntea.nu @rombert Another templating language? ● Secure by default – XSS protection ● Batteries not included to encourage separation of concerns ● Natural templating by blending in HTML5 documents
- 33. http://robert.muntea.nu @rombert Sightly <h4 class="card--${card.itemprop['customStyle']}"> ${card.itemprop['description'] </h4> <div data-sly-list=”${resource.listChildren}”> <article data-sly-resource=”${childResource}”/> </div> <section data-sly-include=”template.html”/> <div data-sly-use.logic=”logic.js”> ${logic.hi} </div>
- 34. http://robert.muntea.nu @rombert Sightly server-side logic /* logic.js */ use(function() { return { hi: “hello, world” } }) /* Logic.java */ public class Logic{ public String getHi() { return “Hello, world” } }
- 35. http://robert.muntea.nu @rombert Extensions ● Thread Pools and Scheduled Tasks ● I18n ● Caching ● Models ● Health Checks ● Eventing
- 36. http://robert.muntea.nu @rombert SlingQuery Get the closest Folder parent $(resource).parents("sling:Folder").last(); Get the second child of each resource $(resource1, resource2).children(":eq(1)"); Find children named en or de $(resource).children("#en, #de")
- 37. http://robert.muntea.nu @rombert Deployment ● Single executable Jar or War file – the Sling launchpad ● Configuration defined in multiple text files, defining bundles, configuration, variables, bootstrap commands, etc
- 38. http://robert.muntea.nu @rombert Provisioning model [feature name=main] [variables] io.version=1.4 [configurations] org.apache.jackrabbit.....SegmentNodeStoreService name="Default NodeStore" repository.home="sling/oak/repository" [artifacts startLevel=5] commons-io/commons-io/${io.version}/jar commons-fileupload/commons-fileupload/1.3.1/jar
- 39. http://robert.muntea.nu @rombert Web Console – Development help
- 40. http://robert.muntea.nu @rombert Web Console – runtime configuration
- 41. http://robert.muntea.nu @rombert Tooling ● Maven Plugins ● Bundle deployment ● Launchpad creation ● Maven Archetypes ● IDE Tooling ● Eclipse ● Netbeans (external)