Tool support for semiautomatic modularization of existing code bases

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Tool support for semi-automatic modularization of
existing code bases

• CBHPC 2009 (November 15th 2009, Portland)Robert
  Mischke, Doreen Seider, Andreas SchreiberGerman
  Aerospace Center (DLR) http//www.dlr.de/sc

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Outline

• What is the vision?
• First step taken Tool support for semi-automatic
  modularization
• Which steps are left?

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Vision

• Situation
• Designing complex systems (spacecrafts, ships, )
  requires numerical simulation codes
• Conducted in complex workflows
• Come from different disciplines
• Run on different hosts
• ? Software integration frameworks provide
  simulation environment

• How do the codes get into the framework?
• Today Mostly manually
• Vision Automatically

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In other words ...
Code B
Software Integration Framework
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Software Integration Framework RCE

• Used as a first reference framework
• Characteristics
• OSGi/Eclipse RCP
• Component-based, service-oriented
• Developed by
• German Aerospace Center (DLR)
  http//www.dlr.de/sc
• Fraunhofer SCAI http//scai.fraunhofer.de
• http//sourceforge.net/projects/rcenvironment

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Software Integration Framework RCE

• Deployment diagram

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Excursus OSGi module concept

• Module concept layer on top of the Java package
  module concept

OSGi Module Two
OSGi Module One
exported
exported
org.package.one
private
private
org.package.two
org.package.three
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Tool support for semi-automatic modularization

• Support for migration of unmodularized software
  into modules
• Limited at the moment to
• Programs written in Java
• OSGi modules (RCE components)
• Eclipse plugin modis (modularisation support)
• Directly integrated in the Eclipse IDE
• Eclipse update site http//rm.swprojects.org/ecli
  pse/updates
• Open Source (01/2010)

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ModisKey Concepts

• Definition of modules by the user
• Continuous validation of the module definition by
  modis
• Cycle detection
• Check wiring between modules
• Check dependency resolution
• Generation of the module descriptions by modis

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ModisModularization Workflow
Running source code analysis
Definition of modules
Elimination of cycles
Resolving invalid outbound dependencies
Resolving invalid incoming dependencies
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ModisRealization

• Backend
• Make use of ASTParser of Eclipse Java Development
  Tools
• Abstract Source Tree
• Dependencies of the whole programm
• ASTParser is backbone for all validation
  implementations
• Frontend
• Tree view
• Dependency Structure Matrix (DSM)

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Modis Tree View
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Modis - DSM
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Future Work

• Long-term
• Automatic integration
• Not limited to specified languages (codes)
• Not limited to specified target frameworks
• Out of reach at the moment
• Good guideline

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Future Work

• Medium-term
• Support for (HPC) languages like C, C,
  Fortran
• Possible approach cross-language model (AST)
• Pattern library for integration of non-Java
  languages into OSGi frameworks
• Wrapper generation based upon defined patterns

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Questions?
Doreen.Seider_at_dlr.de