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Re:寻最佳系统构架？ [Re:yadan]

floater

Java Jedi

总版主

发贴: 3233
积分: 421

于 2003-06-18 22:22

For #1, this is the general rule. However for entity beans, this is exceptional(that's why I say that if no entity bean). The reason behind it is the cost of network traffic. You have to reduce the network overhead for entity beans by using local interfaces of entity beans.

For other options, jdbc, hibernate, etc. It's pretty straight forward

public interface User
{
public long getID();
}

public class JDBCUser implements User
{
public long getID()
{
//get DataSource, get connection, get user
}
}

public class JDOUser() implements User
{
public long getID()
{
//do it in JDO way
}
}

....

Then in your client code using User would like this:
User user = (User) DB.createUser();
long i = user.getID();

In your DB class:
public User createUser()
{
//get class name from configure file and initiate the class, it must be one of JDBCUser, JDOUser, etc.
//return the object.
}

You may need to pass in some parameters to create the user object.

For #3, there are many options with certain restrains on the network side. I don't know the way that your GUI connects to the server, it could be http, rmi, or sockets, etc. So my point is whenever possible, don't use session bean for business logic(out of the picture=get it out of my way, Tongue

). Otherwise you would have a dependency from business logic to ejb container, this doesn't make sense in general.

"Any fool can write code that a computer can understand. Good programmers write code that humans can understand."
- Martin Fowler, Refactoring - Improving the Design of Existing Code

话题树型展开

人气	标题	作者	字数	发贴时间
8423	寻最佳系统构架？	yadan	549	2003-06-18 10:03
8076	Re:寻最佳系统构架？	jameszhang	61	2003-06-18 11:28
7495	Re:寻最佳系统构架？	bujinwang	680	2003-06-18 11:43
7430	Re:寻最佳系统构架？	floater	791	2003-06-18 12:26
7459	Re:寻最佳系统构架？	yadan	1110	2003-06-18 14:46
7402	Re:寻最佳系统构架？	floater	1443	2003-06-18 22:22
7425	Re:寻最佳系统构架？	yadan	1104	2003-06-19 10:23
7362	Re:寻最佳系统构架？	floater	188	2003-06-19 12:51
7651	Re:寻最佳系统构架？	juweiping	183	2003-06-19 13:34
7448	Re:寻最佳系统构架？	yadan	280	2003-06-19 15:08
7625	Re:寻最佳系统构架？	juweiping	151	2003-06-19 15:49
7446	Re:寻最佳系统构架？	yadan	238	2003-06-19 16:07
7545	Re:寻最佳系统构架？	Julian13	1236	2003-06-19 09:09
7373	Re:寻最佳系统构架？	floater	1313	2003-06-19 12:49
7771	Re:寻最佳系统构架？	juweiping	163	2003-06-19 16:26

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