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Scala and its Ecosystem


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This presentation is motivated by the continuous growth of Scala language popularity thanks to many new concepts it offers. Therefore, it makes a perfect sense to take a further insight on this …

This presentation is motivated by the continuous growth of Scala language popularity thanks to many new concepts it offers. Therefore, it makes a perfect sense to take a further insight on this language. Beside the language itself, its ecosystem is also very important. That is why I will focus on the Scala ecosystem in this presentation.

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  • Modularity is quite limited. You can have plugins, but there are no extensions to the type checker, or modifications of the parser possible without hacking the actual compiler.
  • Many new tools appeared in last few months.Most of them replaces Java equivalents.
  • Originally known as Scala with Sails.
  • Transcript

    • 1. Scalaand its Ecosystem
      Petr Hošek @petrh
      CZJUG, September 2010
    • 2. What is language ecosystem?
    • 3. Tools, libraries, frameworks, community, etc.
      Language is useless without its ecosystem.
    • 4. Why Scala ecosystem?
    • 5. With growing usage grows the need.
      Java ecosystem is not enough.
    • 6. Scala Compiler
      Most important part of the Scala ecosystem.
    • 7. Compiler overview
      Version 2.8 released in July.
      Contains many new features.
      Second generation of Scala compiler.
      Oficially named NSC (New Scala Compiler).
      Entirely developed in Scala itself.
      Self-hosted compiler.
    • 8. Compiler usage
      Compiler can be used in several ways:
      • Standalone compiler.
      • 9. Interactive interpreter.
      Usually called REPL(Read-Evaluate-Print Loop).
      • Part of Scala application.
      Instance of compiler class, either batch or interactive.
    • 10. Demo
      Compiler usage
    • 11. Compiler architecture
      Compiles Scala directly into Java bytecode.
      Compilation consists of several phases.
      Each phases transforms the syntax tree.
      Compiler is developed in entirely modular way.
      Designed to be completely re-entrant.
      Can be instantiated as any other class.
      Usage of advanced Scala language constructs.
    • 12. Compiler plugins
      Provide way to easily extend compiler.
      Without modifying its source code.
      Can be inserted in all phases of compilation.
      Allows code transformations, analysis, etc.
      Used for some experimental language constructs.
      Continuations, etc.
    • 13. Demo
      Compiler plugins
    • 14. Scala tools and frameworks
      Basis of the Scala ecosystem.
    • 15.
    • 16. simple-build-tool
      Simple but powerful build tool for Scala.
      Configuration is written in Scala.
      Provides interactive and batch mode.
      Dependency management support.
      Based on Apache Ivy dependency manager.
      Support for other Scala tools.
      Many customizations and extensions exists.
    • 17. Demo
      simple-build-tool usage
    • 18. Specs
      Behaviour-driven design framework for Scala.
      Simple and typed language for specifications.
      Benefits from Scala expressive syntax.
      Integration with testing tools and frameworks.
      JUnit, ScalaCheck, Mockito, etc.
    • 19. Demo
      specs usage
    • 20. Lift web framework
      Expressive and elegant web framework.
      Benefiting from Scala language features.
      Embraces View-First approach to MVC.
      View-Driven Development paradigm.
      Importance of scalability and security.
      Without loss of performance or maintainability.
      Native support for Ajax a Comet.
    • 21. Demo
      Lift usage
    • 22. Well-known Scala tools and libraries:
      • sbaz
      Package sharing tool.
      • ScalaCheck
      Tool for automatic test case generation.
      • Akka framework
      Concurrent, scalable applications development.
      • Configgy
      Library for handling configuration and logging.
      • scalaz, scalax
      Extensions to the standard Scala library.
    • 23. Many more tools and librariesdo exists.
      New ones are coming up to Scala ecosystem every day..
    • 24. Collaborative Scaladoc
      Newest addition to Scala ecosystem.
    • 25. Project overview
      Developmentof Scala project documentation.
      Using the concepts of social collaboration.
      Contribute without digging into source code.
      Try to embrace new approach of source-code documentation authoring.
    • 26. Scaladoc
      Analogy of Javadoc for Scala.
      Second generation of Scaladoc is a part of Scala 2.8.
      Contains new sleek and modern interface.
      Provides improved comment syntax.
      Supports wiki-like syntax in the source comments.
    • 27. Colladoc application
      Allows to edit Scala symbols documentation.
      Lift web application running the Scala compiler.
      Developed as a Google SoC 2010 project.
      Now being developed as open-source project.
      Based heavily upon Scaladoc 2 functionality.
      „Do not reinvent the wheel.“
    • 28. Mergedoc application
      Allows to merge changes into the source-code.
      Simple command-line utility.
      More features planned for the future.
      Not yet officially released.
      Reimplementation of scaladoc-merge tool.
    • 29. Demo
      Colladoc and Mergedoc usage
    • 30. Project status
      The idea already prooved to be viable.
      Comments are being propagated to standard library.
      Project needs more popularisation.
      There are many ideas waiting to be implemented.
      Most them originated in the community.
    • 31. We need you!
      Project is looking for collaborators.
    • 32. Learn more at