....
SamplePortType obj = SampleFactory.getObject();
obj.helloWorld();
....

☆─────────────────────────────────────☆
   gty (宜良-丽江-蝴蝶泉) 于  (Fri Feb 21 02:33:56 2003)  提到:

Session Pool Design

1. 利用apache common-pool实现一个Session Pool（非常简单）
2. 如何避免代码中的returnObject()?

       xxx()            invoke       
        --------> PoolProxy ---> PoolInterceptor      SessionPool
                                           borrowObject()
                                          --------------->
                                          <---------------
                                          
                                          
                                                   xxx()       Session (be borrowed)
                                          -------------------------------->
                                          
                                           returnObject()
                                          ---------------->



☆─────────────────────────────────────☆
   gty (宜良-丽江-蝴蝶泉) 于  (Fri Feb 21 02:38:01 2003)  提到:

RMI design

 xxx()            invoke               Serialize call to remote
-----> ClientProxy ---> RmiInterceptor ------------------->

         find ServerProxy, xxx()               xxx()
RmiServer----------------> ServerProxy --->....-->ServerObject



☆─────────────────────────────────────☆
   gty (宜良-丽江-蝴蝶泉) 于  (Fri Feb 21 02:43:37 2003)  提到:

Method cache design

1.用HashMap做cache

 xxx()       invoke             
-----> Proxy ---> MCInterceptor 
                       1. get Attribute @timeout
                       2. 用object[]作为key，看cache中的
                       结果是否超时

                       3. 如果超时     invoke      
                         ------------------> NextInterceptor...
                       4. 如果不超，返回被cache的结果



☆─────────────────────────────────────☆
   gty (宜良-丽江-蝴蝶泉) 于  (Fri Feb 21 02:47:03 2003)  提到:

Draw activity UML diagram:

1. 实现绘图模块
xxx()      invoke
---> Proxy ---> ActivityIntercpetor 
                             draw xxx()   
                        --------------->绘图模块
                            invoke
                        --------------------------->NextInterceptor...



☆─────────────────────────────────────☆
   gty (宜良-丽江-蝴蝶泉) 于  (Fri Feb 21 02:53:04 2003)  提到:

Persistence and descriptive transaction

1. Persistence直接使用Hibernate


xxx       invoke
---->Proxy-->HibernateInterceptor
                                1. 取得@tx，应该为required,requiresnew
                                ,supports,notsupported中的一种
                                2. 判断当前的transaction状态
                                3. 决定本次调用是否在transaction当中



☆─────────────────────────────────────☆
   gty (宜良-丽江-蝴蝶泉) 于  (Fri Feb 21 03:01:18 2003)  提到:

Folder-Node关系的复用


getFolder()   getFolder()         invoke              getFolder()
  --->UserProxy ------> NodeProxy -->SideEntityInterceptor--> Node 
                                                        return Folder
                                                        <-----
                                             根据Folder创建Group proxy 
                                  返回GroupProxy           
                                  <----
                                           
  
in the code, like this:

...
User user = userFactory.find("guty"); //user is actually a proxy
Group group = (Group)((Node)user).getFolder();

public class AOPHandler implements InvocationHandler {
  static private SamplePortType _orgObject = new SampleClass();

  public static SamplePortType getObject ( ) {
    return (SamplePortType)Proxy.newProxyInstance(
        _orgObject.getClass().getClassLoader(),
        _orgObject.getClass().getInterfaces(),
        new AOPHandler() );
  }

  public Object invoke(Object proxy, Method method, Object[] args)
      throws Throwable {

    SamplePortType obj = SamplePool.getInstance().borrowObject();
    Object result = null;
    result = method.invoke(obj, args);
    SamplePool.getInstance().returnObject ( obj );
    return result;
  }

  static public void main ( String args[] ) {
    SamplePortType obj = AOPHandler.getObject();
    obj.helloWorld ( );
  }
}

public static Object newProxyInstance(ClassLoader loader,
                                      Class[] interfaces,
                                      InvocationHandler h)
                               throws IllegalArgumentException

     Foo f = (Foo) Proxy.newProxyInstance(Foo.class.getClassLoader(),
                                          new Class[] { Foo.class },
                                          handler);

import java.util.logging.*;
import java.util.Stack;
import java.lang.reflect.*;
import java.lang.Object;
import java.lang.System;

interface SamplePortType {
  public void helloWorld ( );
};

class SampleClass implements SamplePortType {
  public SampleClass ( ) { }
  public void helloWorld ( ) {
    System.out.println ( "Hello world!" );
  }
};

class SamplePool {
  static private SamplePool _instance;
  static public SamplePool getInstance() {
    if ( null == _instance ) {
      _instance = new SamplePool();
    }
    return _instance;
  }

  private SamplePool ( ) { _pool = new Stack(); }

  public SamplePortType borrowObject ( ) {
    if ( _pool.empty() ) {
      return new SampleClass();
    } else {
      return (SamplePortType)_pool.pop();
    }
  }
  public void returnObject ( SamplePortType obj ) { _pool.push ( obj ); }

  private Stack _pool;
};

public class AOPHandler implements InvocationHandler {

  public static SamplePortType getObject ( ) {
    return (SamplePortType)Proxy.newProxyInstance(
        SamplePortType.class.getClassLoader(),
        SampleClass.class.getInterfaces(),
        //SamplePortType.class.getInterfaces(),
        new AOPHandler() );
  }

  public Object invoke(Object proxy, Method method, Object[] args)
      throws Throwable {

    SamplePortType obj = SamplePool.getInstance().borrowObject();
    Object result = null;
    try {
      result = method.invoke(obj, args);
    } finally {
      SamplePool.getInstance().returnObject ( obj );
    }

    return result;
  }

  static public void main ( String args[] ) {
    SamplePortType obj = AOPHandler.getObject();
    obj.helloWorld ( );
  }
}

<bean id=“poolTargetSource“     	  
  class=“spring.CommonsPoolTargetSource">
   <property name="targetBeanName">
       <value>petshopServiceTarget</value> 
   </property> 
   <property name="maxSize">        
       <value>25</value>      
   </property>
</bean>
<bean id="businessObject"      
  class=org.springframework.aop.framework.ProxyFactoryBean ">       
   <property name="targetSource">
      <ref local="poolTargetSource"/>
  </property>  
  <property name="interceptorNames">
     <value>myInterceptor</value>
  </property>
</bean>