AEM in Brief

CMS is a software application used to create/manage digital data.

Different usage of a CMS:

1.   Enterprise Content Management(ECM) : System to manage the enterprise content.

2.   Web Content Management(WCM) : System to manage the web content

CMS has 2 important building blocks:

1.   Content management application(CMA) : Application to manage the content

2.   Content delivery application (CDA): Application to deliver the content

AEM is a WCM CMS. It has Author as CMA and Publisher as CDA.

Its a java web application , can run in any server which supports Java servlet API 2.4 or higher. It comes with a jar version(built in servlet engine) and a war(needs application server)

AEM Building Blocks which are open source products:

1.   Java/J2EE

2.   JSR-283(JCR)

3.   Apache OAK(JCR implementation)

4.   Apache Felix(OSGI application framework)

5.   Apache Sling (Web Framework)

It follows MVC Architecture:

Model	JCR(Database)  -OAK(an implementation of JCR)	.It provides data storage, observation versioning, access control, full text search, event monitoring
View	Sling (Web Framework)	Uses scripts/java servlets to process HTTP request in a RESTful way exposing JCR.
Controller	OSGI (Application Framework)	Reusable components, composed into an application and deployed