Friday, November 26, 2010

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optimization of ion Endre course in Functional Programming with Java Java

In my last post ( Functional Programming with Java ) I still have to admit that I did not know whether Java optimization of ion exchange Endre (Tail Recursion) dominates. After a little test, I can say that Java capable 1.6 These optimization. I tested with:

j ava version "1.6.0_22"
Java (TM) SE Runtime Environment (build 1.6.0_22-b04-307-10M3261)
Java HotSpot (TM) 64-bit server VM (build 17.1-b03-307, mixed mode)


The optimized code runs by a factor of four to 5 faster. This is huge! When code is a modified version of Flash Black (Andre Moelle). Andre Moelle compares functional programming in Java and other programming languages with and without ion exchange Endre ( Link ). With him there were no differences between optimized and non-optimized code. But what can be various reasons. My conclusion is at odds with the results of Andre Moeller in 2008. One can justify the differences with different versions of the Java VM and compiler. Unfortunately I did not find a document from Sun and Oracle on this issue.
With this result, even imperative, normal Programmers optimize their code where they reorganize their recursive tail recursive functions. Another tip for last, of course, is the increase in Java stack of the JVM (-Xss) is important when dealing with recursion.

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Java is one of the imperative programming languages, like most popular programming languages. What I write in Java methods strive for is to avoid any side effects, ie, a method used only the transfer parameters. This greatly increases the readability and maintainability of the code. So you can declare such methods as static. This method relates not to object but to the class. It could be used The method also move to any place, of which I advise in general because this is the understanding of the code would be detrimental. I call this type of programming neoprozedurale programming. When following this simple paradigm, it will be seen that both the Code and the mindset of the programmer a positive change. If one neglects the transport aspect of Web services, then the neoprozedurale programming is reminiscent of the web service idea. If one then combines the neoprozedurale programming with test-driven programming, functional programming is one of the closer. But functional programming is more. A light, practical guide provides in blog Alexander Pohl N N blog. What a great name for a blog, I'm envious that such a name is not even occurred to me. What question I ask myself, is the functional programming, a goal of agile software development? I hear the slander HASKELL programming in the past. And the Java and C programmers are complaining about the waste of space (Sorry, stack overflow: use the-Xss) and computing time, if we replace loops by recursion. I can, of course, the optimization of ion exchange Endre (Tail Recursion) as against, but I do not know whether Java (compiler, JVM) makes such optimizations. I'm not quite sure what is the current state of Java, but it is at OpenJDK (Da Vinci Machine) on the plan ( Link ). I'm curious to see how it goes. I would like to put in a kind of functional Java compiler mode to program in Java functional.

Thursday, November 25, 2010

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Boy, I've overwritten the wrong file ...

what now, I've overwritten an important file in the Subversion project and is also only an old version. Eclipse is a local copy of the data processed on the man. If you want to recreate such a local copy, you have the Package Explorer, right click on the file and then in the menu Restore from Local History ... (see picture).
This has been solved the first problem, but because behind every little problem lies a big problem, this problem must be solved. It appears, therefore, that the guidelines for code management are incomplete or insufficiently implemented. As a rule, for each bug fixing, for each feature or refactoring after each SVN repository should be updated. By the way, you can also easily put a local SVN ( Setup a Subversion Server in 4 Minutes ). If this can be difficult to implement in their own development process, then you should take a look at Git .