Effective Web Application Development with Apache Sling
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Effective Web Application Development with Apache Sling Robert Munteanu ( @rombert ) , Adobe Systems Romania
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Apache Sling is an innovative web framework built on top of the Java Content Repository (JCR), that uses OSGi for its component model and fosters RESTful application design. This talk shows how Sling integrates various standard-based technologies, like OSGi and the Content Repository API for Java to create a coherent framework for web application development. We will walk through the development of a simple application with minimal effort and demonstrate how to productize the resulting application. We will pay special attention to some approaches which are not yet part of mainstream development, such as using OSGi for dependecy injection and JCR for persistence.
Transcript of Effective Web Application Development with Apache Sling
Effective Web Application Development with Apache Sling
Robert Munteanu ( @rombert ) , Adobe Systems Romania
About the Speaker
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● Apache Sling PMC member
● Fanboy of the Sling/JCR/OSGi stack
● Enthusiastic Open-Source contributor
● Senior Computer Scientist at Adobe in Romania
Speaker.currentSpeaker().interrupt();
Presentation Flow
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● Quick facts and figures
● Conceptual foundations
● Building blocks
● Building Sling applications
Quick facts and figures
Apache Sling - History
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2007incubation
2009TLP
2014Version 7
200xPre-Apache
Apache Sling – High-level View of the Code
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Source: OpenHub
Apache Sling - Activity Level
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Source: OpenHub
Source: status.apache.org
Conceptual Foundations
Apache Sling – Conceptual Foundations
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REST-basedContent-driven
OSGi-powered
Scripting insideApache
Apache Sling – Apache Open Source
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4Aries
1ServiceMix
7Commons
17Felix
3Geronimo
6Jackrabbit
1Derby
2Tika
Apache Sling – REST-based
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/blog/
/blog/{0}.html
/
BlogViewController
BlogListController
HomeController
//blog/blog/hello-world
SlingMainServlet
Apache Sling – Content-Driven
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blog
hello-world
images
jcr:content
some-cat.jpg
other-cat.jpg
Apache Sling – Content-Driven
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- 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
Apache Sling – Scripting Inside
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JSP
Apache Sling – Scripting Inside
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libs
blogapp
welcome.jsp
welcome
json.html
Apache Sling – OSGi-powered
● Provision and deploy bundles
● Configure, register and lookup services
● Eventing
● Web Console
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Building blocks
Apache Sling – Serving a request
GET /blog/welcome.html
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/blog/welcome myblog/blog.groovy???
Apache Sling – Resource Types
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blog [blogapp/listing]
hello-world
images
jcr:content [blogapp/blog/content]
some-cat.jpg
other-cat.jpg
Apache Sling – Script Resolution
GET /blog.html
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Type: blogapp/listing
Extension: html
Method: GET
/libs/blogapp/listing/html.jsp
@SlingServlet(resourceTypes=”blogapp/listing”,...)
/libs/blogapp/listing.jsp
Apache Sling – Request Selectors
GET /blog.rss.xml
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Type: blogapp/listing
Extension: xml
Selector: rss
Method: GET
/libs/blogapp/listing/rss.html
Apache Sling – Resource Providers
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JCR MongoDB
FS Cassandra
//content//content/comments/logs
Apache Sling – JCR
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Apache Sling – JCR implementations
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Apache Jackrabbit Oak
Building Sling Applications
Apache Sling – JCR modeling
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images
File uploadsome-cat.jpg
renditions
small.jpg
ripple.jpg
Observation
annotations
initial-review
ACLs
Apache Sling - JCR
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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
Apache Sling – Everything is a Resource
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Everything is a Resource
Apache Sling – Reading from the Repository
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@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
}
}
Apache Sling – Reading from the Repository
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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();
Apache Sling - Extensions
● Thread Pools and Scheduled Tasks
● I18n
● Caching
● Models
● Health Checks
● Eventing
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Apache Sling - 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
$(resource).children("#en, #de")
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Apache Sling - Deployment
● Single executable Jar or War file – the Sling launchpad
● Configuration defined in multiple text files, defining bundles, configuration, variables, bootstrap commands, etc
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Apache Sling – Provisioning Model
[feature name=main]
[variables] io.version=1.4
[configurations]org.apache.jackrabbit.....SegmentNodeStoreService
name="Default\ NodeStore" repository.home="sling/oak/repository"
[artifacts startLevel=5] commons-io/commons-io/${io.version}/jar commons-fileupload/commons-fileupload/1.3.1/jar
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Apache Sling - Tooling
● Maven Plugins
● Bundle deployment
● Launchpad creation
● Maven Archetypes
● IDE Tooling
● Eclipse
● Netbeans (external)
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Resources
● http://sling.apache.org/
● http://jackrabbit.apache.org/
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