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If Scala looks like Java to the JVM, why shouldn t a company stick with Java Put another way, if there s nothing that can be written in Scala that can t be written in Java, why use Scala These are important questions, and they are the kind of strategic questions that you will need to answer when selling Scala into your organization. What Scala gives you is aids in concurrent programming: Syntactic flexibility Excellent default libraries for doing concurrent programming (immutable data structures and Actors) Pattern matching Scala s syntactic flexibility means that you can express concurrency-related calls in a way that allows you to have a different syntax for concurrent operations. The syntax was borrowed from Erlang:
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gameBoard ! Chat(who, "Hey guys, this is a chat message")
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So when I m coding in Scala, I know that the previous method invocation is going to send an asynchronous message to my gameBoard. It s got the benefits of Hungarian Notation12 without the verbosity or ugliness. This call syntax also means that the new programmer isn t going to put a call like this inside a loop. How many times have we all seen the junior developer put a remote method invocation (RMI) call inside a loop and wonder why performance sucks
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12. http://en.wikipedia.org/wiki/Hungarian_notation
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CHAPTER 9 SCALING YOUR TEAM
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Scala supports immutability by default. This means that I can pass an immutable data structure to other threads, and they can use that data without synchronization. There s no need to worry about concurrent access to data because the data is not going to change out from under you. There are eight synchronized code blocks in the 15,000-line Buy a Feature code base, and we have not had a single concurrency-related defect. Scala s Actor library (which is implemented entirely as a library and has no compiler support) sits on top of Doug Lea s Fork-Join library. Actors allow for event-based programming. It turns out that this model works very, very well for games and for asynchronous browser-based applications. Yes, a fair number of Python game applications are based on the Twisted event library. It turns out that the event-based semantics are very similar for both Actors and Twisted, so it s no surprise that they are both choices for multiplayer games. (There s a French company building a massive multiplayer online game [MMO] in Scala.) Actors are threadless, stackless event handlers. They only consume stack/thread resources when there s a message for the Actor to process. This is very handy as you can have millions of Actors hanging out waiting to do something, and they only consume system resources when there s something to do. Additionally, it s possible to write a custom scheduler so that you can have all one million Actors processing messages, but they only consume a bounded number of threads. Finally, Scala s pattern matching provides a powerful way to compose event handlers (even dynamically).
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Anything You Can Do, I Can Do Better (in Scala)
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So, there s nothing I can do in Scala that I can t do in Java, with enough time. There s nothing I can do in Java that I can t do in C. However, Scala lends itself to much more developer- and machine-efficient patterns. In fact, Scala gives me the coding efficiency and flexibility that I had with Ruby along with the type safety and performance characteristics of Java and the JVM. Buy a Feature contains 15,000 Scala lines of code (LoC) and represents about one manyear of effort. Measured in this vector, there s nothing surprising. Buy a Feature compiles down to 2,300 classes and has roughly the functionality of a 2,300-class Java program (think ClearSpace). So, if I were to tell you that two people wrote 2,300 Java classes in a year or two, you d tell me I was nuts. Yes, simple Scala statements explode into many classes. But the fact is that the complexity embodied in the simple statement represents the complexity associated with many Java classes. Scala is to Java as C++ is to assembly language. In Scala, I can concisely express far more business logic, that is also far more type-safe, in a single line than in Java. This means that the developer productivity is much higher in Scala than in Java.
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