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Boosting productivity with "Plone-driven Plone development"

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Slides of my talk at the Plone conference 2010 in Bristol, Okt 28th

Slides of my talk at the Plone conference 2010 in Bristol, Okt 28th

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  • Motivation: Likes & Dislikes Idea
  • Die Startseite zeigt… Auf den nächsten Ebenen sieht man Wenn man ein X öffnet, dann Typen: Dashboard, SingleObject, ObjectList, Form Bausteine: Bildergalerie, Zusatzinformationen Ausdrücke: die letzten X, die neusten Y, allg. Suchkritieren

Boosting productivity with "Plone-driven Plone development" Boosting productivity with "Plone-driven Plone development" Presentation Transcript

  • PD 2 Plone Driven Plone Development Henning Rietz, Condat AG Plone Conference 2010 Bristol, 28.10.2010 IT from Berlin
  • Speaker specifics
    • Henning Rietz, hr@condat.de
    Condat AG Software for innovative business processes. Founded 1979 Location Berlin Staff ~65
  • Alliterated Agenda
    • Major motivation
    • Definitive Dream
    • Attractive Advantages
    • Multiple models
    • All-round Application
    • Outrageous Outlook
  • Major motivation
    • Likes
    • Model-driven development
    • Application of design patterns
    • ArchGenXML
    • Dislikes
    • Writing boilerplate code
    • Editing *.zcml, *.xml
    • Migration migraine (Plone 2  3  4  …)
    • Learning curve for new developers
  • Definitive dream The model is Plone content.
  • Dream details
    • Metamodel == Domain-specific language == Plone Content Types
    • Model == Metadata == Description of a specific system == Plone content
    • Code == Implementation of a specific system == Views on Plone content (metadata)
    • ArchGenXML:
    • Metamodel == UML Metamodel
    • Model == UML (XMI file)
    • Code == generated from XMI
    • PloneFormGen:
    • Metamodel == PFG Content Types
    • Model == FormFolder + Subobjects
    • No code generated, interpretation of model at runtime
    • Collections
    Existing Examples It‘s an approach – not a product.
  • Attractive Advantages
    • Reduces manual coding effort  Generates .py, .pt, .cpt, .cpy, .xml, .sql, .zcml, …
    • High configurability (for you and the customer)  Model can be accessed at runtime  Behavior of generic parts is dynamically changed
    • Increases productivity  Homogenous environment, everything is Plone-ish  Makes your design patterns explicit, enforces conventions  Better learning curve for new developers
    • Higher maintainability  Single source for changes  Helps you deal with major changes in Plone architecture  Integrated documentation
    ( orange: specific strengths of PD2 , otherwise: typical advantage of MDD)
  • Conflicting Challenges
    • Keep implementation details out of the models
    • Make it simple
    • Customer readable
    • Generate as much as possible (and useful)
    • Make it powerful
    • Executable
  • Domain description
    • Finding your metamodel – How would you describe your future systems? What abstractions/patterns do you employ?
    • Possible input
      • Legacy systems (to be migrated)
      • The future design
      • Storyboards
      • UML models
      • Your own patterns/frameworks
      • User/technical documentation
  • Multiple metamodels
    • Content
    • Views
    • Navigation
    • Layout
    • Authoring
    • Build
    • Deployment
    • Code Structure
    Abstraction Looking at the system from different perspectives
  • Code structure
  • Code structure modelling
      • Concepts / structures for code generation
      • File, Directory, FileSeries, FileGroup, etc.
      • PT/DTML Templates for code generation, using domain model objects as contexts
      • Code generation traverses the structure, applying model elements to templates, writing the resulting code to the local file system of the Zope (ZEO client) instance
  • UML example
  • Example structure ('plone3layout', 'Plone 3 Standard Layout', 'PD2Layout', {'namingExpression':'context.Title()'}, [ ('readme.txt','README.txt','PD2File',{'viewname':'empty','namingExpression':'self.Title()'},[]), ('setup.cfg','setup.cfg','PD2File',{'viewname':'empty','namingExpression':'self.Title()'},[]), ('setup.py','setup.py','PD2File',{'viewname':setup','namingExpression':'self.Title()'},[]), ('modulepart1','<modulepart1>','PD2Directory',{'viewname':'','namingExpression':'context.Title().split('.')[0]'}, [ ('init.py','__init__.py','PD2File',{'viewname':'initpkg','namingExpression':'self.Title()'},[]), ('modulepart2','<modulepart2>','PD2Directory',{'viewname':'','namingExpression':'context.Title().split('.')[1]'}, [ ('init.py','__init__.py','PD2File',{'viewname':'init','namingExpression':'self.Title()'},[]), ('configure.zcml','configure.zcml','PD2File',{'viewname':'configure','namingExpression':'self.Title()'},[]), ('config.py','config.py','PD2File',{'viewname':'empty','namingExpression':'self.Title()'},[]), ('interfaces.py','interfaces.py','PD2File',{'viewname':'interfaces','namingExpression':'self.Title()'},[]), ('readme.txt','README.txt','PD2File',{'viewname':'empty','namingExpression':'self.Title()'},[]), ('version.txt','version.txt','PD2File',{'viewname':'empty','namingExpression':'self.Title()'},[]), ('browser','browser','PD2Directory',{'viewname':'','namingExpression':'self.Title()'},[]), ('content','content','PD2Directory',{'viewname':'','namingExpression':'self.Title()'}, [ ('init.py','__init__.py','PD2File',{'viewname':'empty','namingExpression':'self.Title()'},[]), ('type.py','<type>.py','PD2FileSeries',{'viewname':'atclass','namingExpression':''%s.py' % context.Title().lower()','listExpression':'context.getContentTypes()'},[]), ('configure.zcml','configure.zcml','PD2File',{'viewname':'cconfigure','namingExpression':'self.Title()'},[]), ]), ('profiles','profiles','PD2Directory',{'viewname':'','namingExpression':'self.Title()'}, [ ('default','default','PD2Directory',{'viewname':'','namingExpression':'self.Title()'}, [ …
  • Example: gstype view <tal:block i18n:domain=&quot;conpd2.codegen&quot; tal:define=&quot;ct context/Title&quot;> <object tal:replace='structure string:<?xml version=&quot;1.0&quot;?>'/> <object name=&quot;PD2Adapter&quot; tal:attributes=&quot;name ct&quot; meta_type=&quot;Factory-based Type Information with dynamic views&quot; xmlns:i18n=&quot;http://xml.zope.org/namespaces/i18n&quot;> <property name=&quot;title&quot; tal:content=&quot;ct&quot;>PD2Adapter</property> <property name=&quot;description&quot;></property> <property name=&quot;content_meta_type&quot; tal:content=&quot;ct&quot;>PD2Adapter</property> <property name=&quot;product&quot; tal:content=&quot;context/getProductName&quot;>ConPD2</property> <property name=&quot;factory&quot; tal:content=&quot;string:add${ct}&quot;>addPD2Adapter</property> <property name=&quot;immediate_view&quot;>base_view</property> <property name=&quot;global_allow&quot;>True</property> <property name=&quot;filter_content_types&quot;>False</property> <property name=&quot;allowed_content_types&quot;> </property> <property name=&quot;allow_discussion&quot;>False</property> <property name=&quot;default_view&quot;>base_view</property> <property name=&quot;view_methods&quot;> <element value=&quot;base_view&quot;/> … Full example
  • Content
  • Content modelling
    • Describes most of the information architecture
    • Metamodel: Types, Attributes, Relationships
      • Probably even more domain-specific
    • Code: AT schemata, classes, GS xml, zcml
    • Also possible: RDBMS-related content
  • UML example (this is taken from the metamodel of the first version of ConPD2, which is basically a metamodel for AT development)
  • Views
  • Views modelling
    • What is presented where/how?
    • Metamodel: View Types (e.g. single object, object list, dashboard) with presentation details (e.g. sorting, batching)
    • Code: template fragments, macros, view classes, helper methods
  • More metamodels
    • Navigation: primary, secondary, depth, …  navigation portlet, sections viewlet
    • Layout: two/three columns, header, footer, …  Viewlets, CSS (cf. Subskins product)
    • Authoring:  roles, workflows, staging, content rules
    • Build & Deployment:  devbuildout|production|test.cfg, deployment scripts, monitoring frontend
  • All-round Application
    • Implement Metamodel
      • E.g. with ArgoUML, ArchGenXML
      • Templates for code generation
    • Deploy PD2
      • Model lives in ZEO server
      • Developers work with local ZEO Client, which writes to local file system
    • Develop with PD2
      • Describe customer site in terms of the metamodel
      • Push the button
      • Make customer specific extensions
      • Implement generic parts (which interpret metadata at runtime)
      • Iterate
  • Outrageous Outlook
    • Metamodels for knowledge management, public internet, collaborative applications, …
    • Plone Technology Metamodel
    • Generic Applications for multiple clients in SaaS scenarios
  • Thank you Condat AG Henning Rietz Alt-Moabit 91 d 10559 Berlin Tel. (030) 3949-1179 [email_address] www.condat.de