In this session, attendees will learn about key features in Backend Development processes involving services development on AEM

1. #evolve18
INTRODUCTIONTO BACK END
DEVELOPMENT IN ADOBE
EXPERIENCE MANAGER
Varun mitra
08/16/2018

2. #evolve18 2
1 | M A V E N , A R C H E T Y P E S A N D L A Z Y B O N E S
2 | I N T R O D U C I N G O S G I
3 | S L I N G : S E R V L E T S , S C H E D U L E R S A N D M O D E L S
4 | S E S S I O N M A N A G E M E N T
5 | Q U E R Y O P T I M I Z A T I O N
INTRODUCTIONTO BACK END DEVELOPMENT IN ADOBE EXPERIENCE MANAGER

3. #evolve18 3
Maven, Archetypes and Lazybones
1. Maven simplifies and provides an uniform build process.
2. Maven makes use of a Project Object Model(POM)
3. pom.xml file defines Project Information, Build Environment Settings
and Relationships.
4. A Maven Archetype/Lazybones is a Project Template

4. #evolve18 4
INTRODUCING OSGI
1. SCR Annotation
a. @component: A JAVA class file that can be stopped or started.
b. @service: An extesnion of component, can be looked up using its interface name.
c. @reference: Defines References to the other services.
d. @properties: Defines properties which are made available to the component.
2. All services are components.
3. @component annotation is mandatory in order to use the rest.
4. Use @component(metatype=true) to create custom OSGI configurations.

5. #evolve18 5
SLING SERVLETS
 Sling Servlet API extends HTTPServlet class
 Use @slingServlet annotation to define a Sling Servlet
 Avoid @slingServlet(paths=‘/bin/foo/bar’)
 Use @slingServlet(resourceTypes=‘/company/foo/bar’, selectors=“{‘foo’,’bar’}”)
 Default Servlet Execution path - /bin
 Define additional execution path with the help of Apache Sling Servlet/Script Resolver and Error Handler

6. #evolve18 6
SLING SCHEDULING
• Scheduler can implement the Runnable API or make use of the Scheduler Interface.
• Scheduler make use of a CRON expression to execute periodically.
Sling Model Enhancements
• Support for resourceType Model resolution allowing a Sling Model to be resolves for a resource based
on the resource's sling:resourceType
• Sling Models will be auto-detected anywhere in the java project.
• ModelFactory API allows creating a model from an object that throws an exception if the conversion is
not possible

7. #evolve18 7
SESSION MANAGEMENT
 Use loginService(String subServiceName, String workspace) for providing Super User Access to the repository.
 Use ResourceResolver API to obtain the logged in user session
 Do not use repository.loginAdministrative or repository.login(userid, password)

8. #evolve18 8
QUERY OPTIMIZATION
 Use sling:Folder or oak:Unstructured when large number of sibling nodes are expected and ordering is not
required. Use nt:unstructured and sling:OrderedFolder otherwise.
 Avoid Queries in components.
 Use node based API’s if the prior knowledge of the location of data is available.
 All queries are converted to SQL2 before being run, however the overhead of query conversion is minimal.
 Use Explain query tool to understand how a query would be executed.
 Enable debug on Query API’s to further analyse the Query Performance:
 org.apache.jackrabbit.oak.plugins.index
 org.apache.jackrabbit.oak.query
 com.day.cq.search

9. #evolve18
THANK YOU!