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Introduction to Back End Development in Adobe Experience Manager

VARUN MITRA | PARTNER TRAINING INSTRUCTOR

August 30th, 2016

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I N T R O D U C T I O N T O B AC K E N D D E V E LO P M E N T

1 | M AV E N A N D A RC H E T Y P E S2 | I N T R O D U C I N G O S G I3 | S L I N G : S E RV L E T S & S C H E D U L E R S4 | S E S S I O N M A N A G E M E N T 5 | Q U E RY O P T I M I Z AT I O N

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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

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Introducing OSGI

1. SCR Annotationa. @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.

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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.

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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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THANK YOU!