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      GameDev.net and CRC Press have teamed up to bring a free ebook of content curated from top titles published by CRC Press. The freebook, Practices of Game Design & Indie Game Marketing, includes chapters from The Art of Game Design: A Book of Lenses, A Practical Guide to Indie Game Marketing, and An Architectural Approach to Level Design. The GameDev.net FreeBook is relevant to game designers, developers, and those interested in learning more about the challenges in game development. We know game development can be a tough discipline and business, so we picked several chapters from CRC Press titles that we thought would be of interest to you, the GameDev.net audience, in your journey to design, develop, and market your next game. The free ebook is available through CRC Press by clicking here. The Curated Books The Art of Game Design: A Book of Lenses, Second Edition, by Jesse Schell Presents 100+ sets of questions, or different lenses, for viewing a game’s design, encompassing diverse fields such as psychology, architecture, music, film, software engineering, theme park design, mathematics, anthropology, and more. Written by one of the world's top game designers, this book describes the deepest and most fundamental principles of game design, demonstrating how tactics used in board, card, and athletic games also work in video games. It provides practical instruction on creating world-class games that will be played again and again. View it here. A Practical Guide to Indie Game Marketing, by Joel Dreskin Marketing is an essential but too frequently overlooked or minimized component of the release plan for indie games. A Practical Guide to Indie Game Marketing provides you with the tools needed to build visibility and sell your indie games. With special focus on those developers with small budgets and limited staff and resources, this book is packed with tangible recommendations and techniques that you can put to use immediately. As a seasoned professional of the indie game arena, author Joel Dreskin gives you insight into practical, real-world experiences of marketing numerous successful games and also provides stories of the failures. View it here. An Architectural Approach to Level Design This is one of the first books to integrate architectural and spatial design theory with the field of level design. The book presents architectural techniques and theories for level designers to use in their own work. It connects architecture and level design in different ways that address the practical elements of how designers construct space and the experiential elements of how and why humans interact with this space. Throughout the text, readers learn skills for spatial layout, evoking emotion through gamespaces, and creating better levels through architectural theory. View it here. Learn more and download the ebook by clicking here. Did you know? GameDev.net and CRC Press also recently teamed up to bring GDNet+ Members up to a 20% discount on all CRC Press books. Learn more about this and other benefits here.


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About crivens

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  1. Or you could license the Big World technology if it's still around or another competing product, and avoid reinventing the wheel. That in theory should lower you budget requirements, assuming you have people skilled enough to use it.
  2. I wonder if Javassist's class loader (Loader) isn't delegating to the parent class loader (the system one).
  3. I still get the same problem on Entity e = (Entity)o;
  4. I tried changing to this:   this.classLoader = new Loader(ClassLoader.getSystemClassLoader(), this.pool);   But it still doesn't work.
  5. Class loader for Entity sun.misc.Launcher$AppClassLoader@151cc2a8 Class loader for objcet javassist.Loader@9246bec
  6. I think my problems is because I'm using multiple class loaders though I'm not sure how to fix it yet.
  7. Forgot the SimpleEntity class:   package cloud; import java.io.Serializable; public abstract class SimpleEntity implements Serializable { }
  8. Hopefully this is a small working example:   package cloud; import java.lang.reflect.InvocationTargetException; import java.lang.reflect.Method; import javassist.CannotCompileException; import javassist.ClassPool; import javassist.CtClass; import javassist.CtField; import javassist.CtMethod; import javassist.CtNewMethod; import javassist.Loader; import javassist.Modifier; import javassist.NotFoundException; public class TestBuilder { private Loader classLoader; private ClassPool pool; private CtClass abstractEntityCtClass; public TestBuilder() { } public void buildClass(String name, String msg) { System.out.println("Building class " + name); // Create CtClass. CtClass ctClass = pool.makeClass(name); // Set superclass to cloud.Entity. try { ctClass.setSuperclass(abstractEntityCtClass); } catch (CannotCompileException e) { // TODO Auto-generated catch block e.printStackTrace(); return; } // Add field. String fieldName = "age"; try { // Create field. CtField field = new CtField(CtClass.intType, fieldName, ctClass); field.setModifiers(Modifier.PUBLIC); ctClass.addField(field); String s = "public void say() { System.out.println(\"" + msg + "\");}"; ctClass.addMethod(CtNewMethod.make( s, ctClass)); } catch (CannotCompileException e1) { // TODO Auto-generated catch block e1.printStackTrace(); return; } // Add property. String getterName = "getAge"; String type = CtClass.intType.getName(); StringBuffer sb = new StringBuffer(); sb.append("public ").append(type).append(" ").append(getterName) .append("(){").append("return this.").append(fieldName) .append(";").append("}"); try { CtMethod method = CtMethod.make(sb.toString(), ctClass); ctClass.addMethod(method); } catch (CannotCompileException e) { // TODO Auto-generated catch block e.printStackTrace(); return; } System.out.println("ctClass " + ctClass); } public Object createInstance(String name) { System.out.println("Creating class instance " + name); Object o = null; // Create and add to list. Class<? extends SimpleEntity> newKlass; try { newKlass = (Class<? extends SimpleEntity>) classLoader.loadClass(name); o = newKlass.newInstance(); SimpleEntity e = (SimpleEntity)o; // objects.add(o); System.out.println("Created instance " + o); } catch (ClassNotFoundException e1) { // TODO Auto-generated catch block e1.printStackTrace(); return o; } catch (InstantiationException e) { // TODO Auto-generated catch block e.printStackTrace(); return o; } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); return o; } Method method; try { method = o.getClass().getMethod("say"); method.invoke(o, null); } catch (NoSuchMethodException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (SecurityException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalAccessException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (IllegalArgumentException e) { // TODO Auto-generated catch block e.printStackTrace(); } catch (InvocationTargetException e) { // TODO Auto-generated catch block e.printStackTrace(); } return o; } public void build() { String name = "foo.Bob"; // Create new class pool and loader. buildPool(); // Build the class. buildClass(name, "fred"); // Create instance. Object o = createInstance(name); // Create new class pool and loader. buildPool(); // Rebuild the class. buildClass(name, "bob"); // Create an instance of the rebuilt class. Object o2 = createInstance(name); } private void buildPool() { // Create class loader and pool. this.pool = new ClassPool(ClassPool.getDefault()); this.classLoader = new Loader(); this.classLoader.setClassPool(this.pool); // Get the cloud.AbstractEntity class. try { abstractEntityCtClass = ClassPool.getDefault().get( "cloud.SimpleEntity"); System.out.println("Abstract Entity " + abstractEntityCtClass); } catch (NotFoundException e) { e.printStackTrace(); System.exit(-2); } } /** * @param args */ public static void main(String[] args) { TestBuilder builder = new TestBuilder(); builder.build(); } }
  9. I'm working on it but I don't know that I can. :)
  10. I have an abstract class Entity and a derived class, let's call it Fred. I'm using newInstance() but I want to store the new instance in a HashMap<String, Entity>.  When I do    (Entity) klass.newInstance();      I'm getting an exception that I can't cast to Entity but I don't understand why.    To further complicate matters, the class definition for Fred is created dynamically at runtime using a Javassist class loader.   Any suggestions appreciated.
  11. Does anyone know of a Java library that can create WSDLs from POJOs, programatically/dynamically at runtime? I've found various tools that can generate them using a command line tool. But I need a way to do it programatically as my classes are generated dynamically at runtime. Thanks
  12. Using a different class loader seems to work. I know it leaves the old classes in the old class loser it that's fine as the apps will be restarted once the structure of the new classes is finalized. Thanks
  13. My problem is a link error due to a duplicate class. I'm creating a simple test case to see if I can get around this using a new class loader instance each time I create new versions of the class. I may have something working.
  14. I am using reflection and it works beautifully except I can't create my new classes. Instances of the old classes are deleted when I create the new classes as they get replaced with instances of the classes. Another option would be to rename the old classes but I can't get the to work either. Thanks
  15. It's an integral part of my design (prototype)  - yes I know I'm crazy.