Brief into to Sling presented to the Bucharest JUG, 2nd edition, 22-06-2012

1. Apache Sling - The whys and the hows
Apache Sling – The whys and the hows
OSGi, JCR, REST, BCP
Robert Munteanu
@rombert rmuntean@adobe.com
rmuntean@adobe.com @rombert

2. Who I am

$DAYJOB 
FOSS

Adobe CQ 
MantisBT
− Apache Sling 
Mylyn Connector
− Apache Jackrabbit
for MantisBT
− Apache Felix

Mylyn Connector
for Review Board
rmuntean@adobe.com @rombert

3. Why Sling
Bringing back the fun
rmuntean@adobe.com @rombert

4. Apache Sling architecture
rmuntean@adobe.com @rombert

5. Why Sling (2)

Non-mainstream
technology choices

Standard nonetheless

Coherent

Opinionated (TM?)
rmuntean@adobe.com @rombert

6. Why Sling (3)

Content first approach

RESTful access to resources

Polyglot request handling

Java

Javascript

JSP

Ruby

Access control management

Logging ( slf4j )
rmuntean@adobe.com @rombert

7. Why Sling (4)

Apache Top-level project

High-profile Sling adopters

Sakai Project ( sakaiproject.org )

Adobe CQ ( adobe.com/products/cq.html)

Idium Web ( idium.no/web/ )
rmuntean@adobe.com @rombert

8. Why Felix

Sling is a set of OSGi bundles

Builds on support from Apache Felix
– Dependency Injection
– Eventing
– Configuration Admin
– Modularity
rmuntean@adobe.com @rombert

9. Why Jackrabbit
rmuntean@adobe.com @rombert

10. Why Jackrabbit (2)
rmuntean@adobe.com @rombert

11. Sling use cases

Blogs, news , bug
trackers

Digital asset
management

Wikis
rmuntean@adobe.com @rombert

12. And now...
rmuntean@adobe.com @rombert

13. OSGi component
@Component
@Service(ChaosMonkey.class)
public class DrunkChaosMonkey implements
ChaosMonkey {
@Reference SlingRepository repo;
void doWhateverAChaosMonkeyDoes() { … }
}
rmuntean@adobe.com @rombert

14. Eventing
@Component
@Service(EventHandler.class)
@Property(name=”event.topics”,
value=”some/event/queue”)
class LazyHandler implements EventHandler {
public void handleEvent(Event event) {…}
}
rmuntean@adobe.com @rombert

15. Project layout
rmuntean@adobe.com @rombert

16. Think in content, not in tables
/content/myblog/posts/iphone_shipping/attachments/front.jpg
[Blog] [Post] [Attachment]
- blogId - postId - attachmentId
- author - blogId - postId
- title - filename
- text + resource
(nt:resource)
- date
In-depth discussion at http://wiki.apache.org/jackrabbit/DavidsModel
rmuntean@adobe.com @rombert

17. Q&A
rmuntean@adobe.com @rombert

18. Resources

Apache Sling – http://sling.apache.org

Apache Felix – http://felix.apache.org

Apache Jackrabbit –
http://jackrabbit.apache.org

@rombert{,w}
rmuntean@adobe.com @rombert