Joomla2.0 architecture

Joomla! 2.0 ArchitectureJ and Beyond

May 6, 2011

Herman Peeren

[email protected]

Filip Dujardin: Crazy Building 6

Software Architecture • structure of the whole• under the hood

Extending what you have...

building more • more and more• knitting...• more• and more• and even more

James Wines: Highrise of Homes (1981)

starting small:

Hundertwasser

and more...

Until the past becomes a burden

Giovanni Francesco Barbieri Guercino: Atlas (1646)

Example: Joomla! 1.6 ACL• earlier Access Control for editing: /administrator-folder• earlier Access Control for viewing: restricting menu- and article ac-

cess for groups• newer ACL while keeping the old structures

After:• 1.5• 1.6• 1.7• 1.8• 1.9• 1.10• ...• 1.98

...it might be time for a

Major release: .N.B.: no major version forseen in framework version numbers (11.1 etc.)

Not even the sky is the limit!

Andrea Pozzo: trompe l’oeil, fresco, St. Ignazio, Roma

some books:

both from 2003...

Conversion to

OOP DDD ORM TDD COC WTF Caravagio: the Conversion of St. Paul (1601)

Back to the OOP-basics • Simula (1960s); e.g. simulation of waiting queues• no division between data and behaviour: objects!• smaller problems that can be handled

Nelleke Verhoeff: Ellenlange Schlange (2003)

Layers • 3 main layers:

presentation, domain, data

• OOP: domain layer is central (DDD)

Mark Rothko

ORM • Object - Relational Mapping• Frameworks. Java: Hibernate. PHP: Doctrine (2)• Doctrine a.o. used in Zend, Symfony etc. • Can be used in Joomla! (JCM-article)• http://www.doctrine-project.org

aside: LINQ... for PHP • SQL for recordsets in .NET (Language Integrated Queries)• PHP, open source: http://phplinq.codeplex.com/• mainly targeting Recordsets (but could be generally useful for

Table Data Gateways)• Doctrine uses DQL (like SQL, but querying objects, not tables)

MVC?• How does our Holy Trinity MVC fit into this story?

Antonio de Pereda (1611-1678): Holy Trinity

MVC and layers• invented 1978/1979• originally in the presentation layer• now: scattered over layers• or: instead of layers

Prof. Trygve M. H. Reenskaug (Oslo)

← MVC in presentation layer

MVC everywhere...

Naked Objects• PhD thesis Richard Pawson

2004 (Dublin, Ireland)

• http://downloads.nakedobjects.net /resources/Pawson%20thesis.pdf

• Foreword by Trygve Reenskaug

• back to ‘behaviourally-complete’ objects!

Hans Memling: Vienna Triptych Enthroned Madonna (1485), closed

NakedPHP• a framework to implement Naked Objects in PHP• by Giorgio Sironi• http://giorgiosironi.blogspot.com/2009/07/naked-objects-in-php.html• http://sourceforge.net/projects/nakedphp/ (LGPL)

Adolf Ziegler: The Four Elements: Fire, Water and Earth, Air (before 1937)

Experiments from the lab• System-U: all objects only a uniform interface as public methods• System-R: recources as basic objects• System-A: Access control as feature in basic objects• agregate MVC: class com_mycontents extends com_contents

Piet Mondriaan (1872-1944): tree, more and more abstract

UP-TO-DATE!Joomla! 2.0 could have:• DDD and ORM• database independency• better integrated ACL, no /administrator• RESTful interface• Extendable API

Vangobot: Skyscrapers Architecture Pop (http://popartmachine.com/)

...and be:

“Creativity requires the courage to let go certainties”

Erich Fromm

Sergey Tyukanof (http://www.tyukanov.com/): Alice in Wonderland (2005)

Who joins this dance?• goal: to work towards a new major version

Henri Matisse: La Danse (1910)