ExtbaseObject to XML Mapping

Thomas Maroschik

Agenda

• XML basics

• Current state of EXT:palm

• Fail of EXT:palm

• Vision and the future

• Discussion

XML Basics

Key Technologies

• XML

• Schema

• DTD

• XSD

• RelaxNG

• XPath / XQuery

• XSLT

XML Document

XML Namespace

XML Namespaces

XML Schema (DTD)Deprecated, W3C Recommendation

XML Schema (XSD)Popular, W3C Recommendation

XML Schema (RelaxNG)Popular, Oasis/ISO Standard

XPath

/bookshelf/book/title/bookshelf/book[1]/title

/bookshelf/book/author/text()/bookshelf/book[price<37]/title

XSLT

Current State of EXT:palm

Features• Generate XML schema (XSD) from annotated

Domain Models

• Serialize instances of Domain Models to XML document

• Unserialize XML document to instances of Domain Models

• merging of XML data with existing data from repositories by rules

• Backend module

• Scheduler task

• No XML Namespaces yet

Example Domain Model

Example Palm Usage

Example Palm Merger Usage

Live Demo

Fail of EXT:palm

Inner Concept

• uses annotations for binding

• uses reflection for mapping

• serializing and unserializing is configurable by typoscript

• uses DOM for XML access

Serializer Concept

• iterates recursively over object

• builds DOMDocument directly

=> 2 in memory representations of data

Unserializer Concept

• iterates recursively over DOMDocument

• maps the data to an array

• array is mapped to object by property mapper

=> 3 in memory representations of data

Merger Concept

• can import/merge external data by unserializing xml to object

• fetches domain object from repository

• compares objects and applies changes by rules

=> 4 in memory representations of data

But why does this fail?

Reasons for Fail

• everything is defined global

• domain object cannot be serialized to different xml outputs

• configuration via TS in Extbase is flawed

• massive memory consumption

• reflection is quite slow

Conclusion

• currently just usable for limited usecases

Hacks to get it work

• import/merge all of a 2,2MB XML file takes of up to 2,5GB of memory

• 2 scheduler tasks

• one that populates a jobqueue

• one that does just a single import/merge at a time (import of 60 aggregate roots takes 60 Minutes)

Vision and the future

ConceptXML Schema

Classes

BindingXML Data

serialize

unserialize

Object

serialize

unserialize

generate

generate

use

use

Implementation Concept

• binding will be done by a binding document instead of annotations

=> xml and objects may have very different structure=> custom un-/serializers for data types=> no global configuration anymore

• compile binding to php=> no reflection at runtime anymore

• use xml reader/writer instead DOM=> save memory and gain speed

How could the binding look like?

Example from jibx.sourceforge.net

What do you think?

Thanks!

Contact me via:

tmaroschik@dfau.de

@tom_noise

Contribute via:

forge.typo3.org/projects/extension-palm/