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CHAPTER 6 ACTORS AND CONCURRENCY
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depth in terms of the use and features of Scala Actors than I covered in this chapter. If Actors seem like a good tool in your software tool chest, please dig deeper, because there is a lot more good stuff to Actors. Up to now, we ve been focusing on what I call the library-consumer coding. We ve been writing code that consumes the libraries provided by Scala. Scala has a more complex side based on its type system and traits. In the next chapter, we re going to go where there be dragons and explore the kind of gnarly stuff that library authors use to make sure the programs that library consumers write are type-safe and concise. Please put on your thinking cap and your hip waders, and let s do some hard-core Scala.
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Traits and Types and Gnarly Stuff for Architects
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o far, we ve explored Scala from what I consider the library-consumer perspective. For the most part, when I m consuming libraries, I don t worry about complex types, composing many traits into a class, or some of the other powerful features of Scala. Why you may ask. Well, I m worried about the transformation of input to output, happily mapping Lists, and filtering Seqs. When I m coding in this mode, I m not reasoning about my types, but I m confident that Scala will make sure I don t do anything horribly wrong and that as long as my logic is sound, my code will work. When I m in this mode, I m writing code the same way I write Ruby code: I m looking to get something to work and get some work done. There are other times when I am designing libraries for other folks to consume. I do this for the Lift Web Framework and for my consulting projects. In this case, I spend a lot more time making sure that the constraints are in place for writing correct code. It takes a lot of time for me to reason about the constraints and then to reduce them to code. When I m in this mode, I write fewer lines of code, but they are more descriptive. I call this library producer mode. You may be asking, Why not always code in this mode It s because most problems are not solved by coding in this mode. Most of my coding tasks are some variant of, Here s some user input, and it should be tested this way, and if it s valid then it should update state and send the following events. Reasoning about types is hard and slow work for me. Choosing implicit conversions and designing domain-specific languages (DSLs) takes time, thought, and deliberation. Using types, especially when type inferencing makes them invisible, is simple and doesn t take a lot of thought away from the task at hand. Well-defined types and type interactions will stay out of the library consumer s way but guard against program errors. Similarly, a well-defined DSL will make expressing program logic faster and easier to maintain.
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CHAPTER 7 TRAITS AND TYPES AND GNARLY STUFF FOR ARCHITECTS
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Scala is unique among the languages I ve used in that it gives a different set of tools and powers to different team members. Scala s traits, type system, flexible syntax, and implicit conversions give amazingly powerful tools to architects and library designers to build libraries that are simultaneously easy and safe to use. Safety means that tests can focus on the logic of code, not calling conventions. We ve seen some examples of the safety of using Option instead of null testing. Being able to reason about the safety by making sure that things have the correct types is very powerful. It also means that the library consumers can focus on their business logic without worrying about declaring lots of fancy types or other distractions. Library consumers don t have to program defensively, because they can trust the correctness of parameters and of return values. This chapter is a deep dive into the language features that make Scala different from Java. These are tools that I use when I design code bases for other people to consume. These tools let me write code that I can reason is correct, so when I go to write application code, I can be sure that my code is correct if my logic is correct. I can write logic-oriented tests rather than tests that try to fool my code and make sure that I m guarding against nulls or other parameter and type-related problems.1
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