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JTA in Jboss (DataBase mysql)

Jedi — Fri, 01 Sep 2006 00:55:00 GMT

1. mysql driver -> server\default\lib
2. jdbc connection datasource server/default/deploy/mysql-xa-ds.xml

  MySqlXADS
  com.mysql.jdbc.jdbc2.optional.MysqlXADataSource
  jdbc:mysql://127.0.0.1:3306/temp
  root
  ">....xa-datasource-property>
  root
  >.....password>
  org.jboss.resource.adapter.jdbc.vendor.MySQLExceptionSorter

   mySQL

3. server/default/conf/standardjbosscmp-jdbc.xml

      java:/MySqlXADS
      mySQL
....
....

4. server/default/conf/jboss-service.xml
      name="jboss:service=XidFactory">
//uncommented the line below...
      true

Jedi 2006-09-01 08:55 发表评论

Axis Tips

Jedi — Tue, 15 Aug 2006 01:22:00 GMT

1. 某个service的参数有复杂对象�Ӟ��如果要用默认的beanmapping�Q�记得这个对象要有的默认构造器(�I�参数构造器)�Q�不然Axis在处理的时候会所有的字段都是同一个�?.至于原因我没搞清�?,-~~
2. 不要用List�Q�尽量用数组!

ValueBean[] getValues()
    {
        ArrayList result = new ArrayList();
        return (ValueBean[]) result.toArray();
    }

上面的代码还是会出问题，要用iterator一个一个map�q�去

public class ValueHelper
    {
        public static ValueBean[] toArray(List values)
        {
            ValueBean[] result = new ValueBean[values.size()];
            Iterator i = values.iterator();
            int i = 0;
            while (i.hasNext())
            {
                ValueBean value = (ValueBean) i.next();
                result[i++] = value;
            }
            return result;
        }
    }
    ValueBean[] getValues() {
        ArrayList result = new ArrayList();
        return ValueHelper.toArray(result);
    }

3. 要生成符合ws-i的web service最好用document/literal
style="document "use="literal">

Jedi 2006-08-15 09:22 发表评论

A good Http debug Utility - fiddler

Jedi — Tue, 15 Aug 2006 01:15:00 GMT

http://www.fiddlertool.com/fiddler/
.net framework 1.1 needed

for firefox need some added configurat

menu->tools->preference/option->connection settings->bottom->

C:\Documents and Settings\jedikings\My Documents\Fiddler\Scripts\BrowserPAC.js -> reload

Jedi 2006-08-15 09:15 发表评论

Mozilla web service proxy~~ (for all Gecko-based browser)

Jedi — Tue, 11 Jul 2006 04:13:00 GMT

用�v来还是很��单，唯一要注意的是用Axis生成Web Service的时候记得在global configuration里面改一�?br />

ie下的话也有一个webservice.htc�Q�没仔细研究�q?.

Jedi 2006-07-11 12:13 发表评论

Reading notes -- Singleton pattern

Jedi — Sun, 09 Jul 2006 04:42:00 GMT

public class Singleton {

     private volatile static Singleton uniqueInstance;
     private Singleton(){

    }

     public static Singleton getInstance(){
         if (uniqueInstance == null ){
             synchronized (Singleton. class ){
                 if (uniqueInstance == null ){
                    uniqueInstance = new Singleton();
                }
            }
        }
         return uniqueInstance;
    }

}

1. private constructor
2. static getInstance
3. syncronized..waste a lot of time
4. double check..modified syncronize, so time-waste might occurs only when first time the instance construct

Jedi 2006-07-09 12:42 发表评论

What's the JRE means (zz)

Jedi — Fri, 23 Jun 2006 19:26:00 GMT

http://www.newsmth.net/bbscon.php?bid=756&id=53934

以我的机器�ؓ�?br />我得jdk装在�?br />C:\Program Files\Java\jdk1.5.0_06
安装�q�个jdk的时候，它要求我安装jre�Q�我也选择装了�Q�装在了
C:\Program Files\Java\jre1.5.0_06

然后 C:\Program Files\Java\jdk1.5.0_06\ 目录下有个jre目录
��是存在 C:\Program Files\Java\jdk1.5.0_06\jre �q�么一个jre

C:\Program Files\Java\jre1.5.0_06 我们叫它 jre a
C:\Program Files\Java\jdk1.5.0_06\jre 我们叫它 jre b

�q�_��所说的jre是指 �q�里的jre a�Q�它是�ؓ了让你的机器可以�q�行 java�E�序�?br />只能�q�行�Q�不能开发，因�ؓ没有javac
�q�个jre可以单独安装�Q�版本一��L��话都一��P��Ҏ��licene�Q�好象目前不允许剪裁�Q?/p>

jre b 是随jdk的，不能不装�Q�因为�?jdk>jre jdk也需要jre�?br />��是装jdk��׃��出现�q�个jre b

一炚w��U�的�Q�jrea �?jreb有什么不�?br />
jreb 是�ؓjdk服务的，它有jrea的全部功能，同时��Z��jdk服务�Q�它的类库，比方说rt.jar
�Q�多一些调试信息，因�ؓ开发java�E�序�Q�会调试啊，用jrea没办法调试，比方说不能断点到
基础�c�d��里面
看jrea和b的rt.jar 大小不一��P��jreb的大一些，带有调试信息�Q�主要是class里的
LineNumberTable) ,所以运行时�Q�jreb的速度或者蝲入速度隑օ�慢一些，或者说�Q�用jdk�q?br />行java�E�序比jre�q�行慢一些，虽然你感觉不刎ͼ�臛_��class��寸上不一�?/p>

Jedi 2006-06-24 03:26 发表评论

Reading note of "Head First Design Patterns": Strategy Pattern

Jedi — Tue, 13 Jun 2006 04:42:00 GMT

Problem:   Started with a simple SimUDuck App..
   Joe's company makes a duck pond simulation game, SimUDuck, The game can show a large variety of duck species swimming and making quacking sounds.

Initial Design:

But now some new functionality should be added, for example: we need some of the ducks to FLY.

First Design:
   We add a method fly() into the Duck class. It seems worked, but something went horribly wrong because not all ducks can fly. so....

Second Design: Using inheritance and polymorphism
   Always override the fly() mehtod in the subclass where needed.

   Drawbacks: Everytime a new duck is added, you will be forced to look at and possibly override fly() and quack(). so is there a cleaner way of having only some of the duck types fly or quack?

Third Design: Using interface!

Drawbacks: It completely destroy code reuse for those behaviors.

1. Design Principles: Identify the aspects of your application that vary and separate them form what stays the same!
                               which means Encapsulate the parts that vary!
2. Design Principles: Program to an interface, not an implementation! (interface here means supertype! including interface
                               and abstract class!.. making use of the polymorphism functionality).
3. Design Principles:  Favor composition over interface!

Strategy Pattern: Using Composition!

Code implement:
FlyBehavior.java

public interface FlyBehavior{
public void fly();
}

FlyWithWings.java

public class FlyWithWings implements FlyBehavior{
   public void fly(){
      System.out.println("I'm flying!!");
   }
}

FlyNoWay.java

public class FlyNoWay implements FlyBehavior{
   public void fly(){
      System.out.println("I can't fly");
   }
}

Duck.java

public abstract class Duck{
   FlyBehavior flyBehavior;
   public Duck(){
   }

   public abstract void display();

   public void performFly(){
      flyBehavior.fly();
   }

   public void swim(){
      System.out.println("All ducks float, even decoys!");
   }
}

MallardDuck.java

public class MallardDuck{
   public MallardDuck(){
      flyBehavior=new FlyWithWings();
   }

   public void display(){
      System.out.println("I'm a real mallard duck");
   }
}

The Definition of Strategy Pattern: The Strategy Pattern defines a family of algorithms, encapsulates each one, and makes them intercahgeable. Strategy lets the algorithm vary indepanedtl from client that use it

Problems:
1. It's weird to have a class that's jast a behavior: classes represent things both have state and methods. a flying behavior might have instance variables representing the attributes for the flying behavior.
2. Be care of Over-Design: implement your code first, then refractoring!

Jedi 2006-06-13 12:42 发表评论