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

1. #evolverocks
Overview of the core AEM technology
ABHISHEK DWEVEDI
August 31st, 2016

2. #evolverocks 2
Overview of the core AEM
technology
1. Adobe Experience Manager Capabilities
2. Architecture Stack
3. Jackrabbit Oak
4. Java Content Repository
5. Apache Sling
6. OSGi

3. #evolverocks 3
AEM Modules and Capabilities

4. #evolverocks 4
The Architecture Stack
Java Content Repository (JCR)
Apache Sling
Adobe Experience Manager
OSGi

5. #evolverocks 5
Jackrabbit Oak
Jackrabbit Oak is an effort to implement a
scalable and efficient hierarchical content
repository for use as the foundation of modern
world-class websites and other demanding
content applications.

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Goals : Jackrabbit Oak
• Scalability
• Big repositories
• Distributed repository with many cluster nodes
• Improved write throughput
• Parallel writes
• Support for many child nodes
• Support for manyAccess Control Lists (ACLs)
• Implement standards like JCR,WebDAV, and CMIS.
• Easily accessible from various platforms, especially from JavaScript clients running in modern browser environments.
• More out-of-the-box functionality than typical NoSQL databases

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Oak Architecture (Hamburger Architecture)
The burger’s top bun: Oak JCR
• Implements the JCR API
• Now implemented for JCR - Non-Java implementations possible and part of the concept
The burger’s patty: Oak Core
• Where most of the heavy lifting takes place
• Adds to the MK’s tree model (ACLs, search, and indexing)
• Observation
• Exposes a decorated tree model
• Mostly transforms JCR semantics into tree operations
• Also contains ‘commit hooks’ that implement JCR constraints, for example, node types
The burger’s bottom bun: Microkernel
• Implements a tree model (nodes and properties)
• Exposes the MicrokernelAPI

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Introduction to the Java Content Repository
• JCR is a database that looks like a
file system.
 It is unstructured, and enables versioning
and observation.
 It provides services such as full-text search,
indexing, access control, and event
monitoring.
• The Adobe implementation of JSR-
283 is the Content Repository
eXtreme (CRX)

9. #evolverocks 9
Introduction to Apache Sling
• Key principles:
 Web application framework
 Content-oriented (JCR-based) application development
 RESTful
• Sling is resource-oriented, where every resource has a URL.
• Processing of a request is done by
 Checking whether the URL resolves to a content object (resource) for which a script can be
found to render the content
 Mapping a JCR node to the resource

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OSGi
What is OSGi?
 A set of specifications that define a dynamic component system for
Java
 Specifications enable:
 A development model where applications are (dynamically)
composed of many different (reusable) components
 components to hide their implementations from other
components while communicating through services, which are
objects specifically shared between components
 A collaborative software environment
 The application emerges from assembling multiple reusable
modules that have no previous knowledge of each other.

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OSGi Bundles
 Packaged as JAR files
 With extra metadata - the manifest
 OSGi bundles can contain:
 Java code
 scripts
 content
 configuration
 other files
 Bundles can be loaded and installed during normal operations.
 Installation in the CQ5 environment through:
 folders named install
 theWeb Console

12. #evolverocks
THANK YOU!