The document outlines an introduction to backend development in Adobe Experience Manager, covering key topics such as Maven and archetypes, OSGi, Sling servlets, and session management. It explains the role of annotations in OSGi components and how to manage queues and queries efficiently. Additionally, it discusses best practices for query optimization and provides resources for further learning.

1. © 2016 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential.© 2016 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential.
A virtual developer conference for Adobe Experience
Manager
Introduction to Back End Development in Adobe Experience
ManagerVarun Mitra | Partner Training Instructor

2. © 2016 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential.© 2016 Adobe Systems Incorporated. All Rights Reserved. Adobe Confidential.
Introduction to Back End Development in Adobe Experience
Manager
2
1 | Maven and Archetypes
2 | Introducing OSGI
3 | Sling: Servlets, Scheduling & Models
4 | Session Management
.
5 | Query Optimization
.

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Maven and Archetypes
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 is a Project Template
5. Maven Archetypes can be used with AEM Sling Plugin for Eclipse.

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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.
Introducing OSGI

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Introducing Sling

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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

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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 Models
 Provides a framework for development
 Annotation driven POJOs
 OOTB works with:
 SlingBindings
 OSGi services
 request attributes
 Adaptable to multiple objects
 Resource and SlingHttpServletRequest
 Use annotations to handle inputs

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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)

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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

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Q&A
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Varun mitra
vmitra@adobe.com
LinkedIn: Varun mitra