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Game AI – An Introduction to Behaviour Trees

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Game AI is a very broad subject and while there is a lot of material out there, I didn’t find something that introduces the concepts gently and at a slower, more understandable pace. This article will try to explain how to design a very simple but extendable AI system loosely based on the concept of Behaviour Trees. What is AI? ...

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Books That Have Most Influenced My Software Development Career

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I have read numerous books on software development and have learned valuable things from most of them, but a small subset of these books has significantly influenced me and how I develop software. Effective C++ and More Effective C++ Although I had written a lot of lines of code in BASIC, Pascal, C, and C++ before starting my career, it ...

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Java EE: Asynchronous constructs and capabilities

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Introduction Java EE has a number of APIs and constructs to support Asynchronous execution. This is vital from a scalability and performance stand point. Let us assume 2 modules which are interacting with each other. When moduleA (the sender) sends a message to moduleB (the receiver) in a Synchronous fashion, the communication takes place in the context of a Single thread ...

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HawtIO on JBoss EAP (Part II)

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I just posted an entry on running HawtIO on JBoss Wildfly 8.1 recently. From that post you know how awesome HawtIO is, and all of the cool plugins it has to make managing your JVM based technologies from a single dashboard… well… hawt…. However, I wanted to dedicate a post to running HawtIO on JBoss EAP for the same reasons ...

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Decorator Design Pattern Applied

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Hi there! Today i’m gonna show the decorator design pattern in action. The decorator design pattern is a largelly used design pattern while dealing with grafics, trees and dynamic changes during runtime. It is also a greate choice if you are looking or trying to do recursion with. I love it. In this post we will implement a students decoration. ...

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Writing Clean Tests – To Verify Or Not To Verify

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When we write unit tests that use mock objects, we follow these steps:                     Configure the behavior of our mock objects. Invoke the tested method. Verify that the correct methods of our mock objects were invoked. The description of the third step is actually a bit misleading, because often we end ...

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Maven Git Release

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I need to start this post by stating that I’ve only started to work seriously with Git within the last year. Unfortunately, a lot of the projects that I work on are still using SVN or CVS, but I’m now finally starting in a few that use Git. During the last few years, I’ve done a lot of software releases ...

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Compile-time checking JPA queries

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JPA provides several alternatives for querying data. Such alternatives may be classified attending to a variety of criteria, eg, language used (SQL vs JPQL) or whether queries are static (compilation time) or dynamic (execution time). Static queries are defined using annotations @NamedQuery (javax.persistence.NamedQuery) and @NamedQueries (javax.persistence.NamedQueries) in the @Entity class definition itself:         @NamedQuery( name="findAllCustomersWithName", query="SELECT c ...

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Android Listview with multiple row layout

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In many posts we talked extensively about ListView and how to handle it: creating custom adapter or handling user interactions. In this post, I will cover another aspect related to the ListView that was not covered in the past: ListView with multiple row layout. By now we have seen rows having the same layout, anyway it is possible to have ...

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