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用hibernate mapping collections of component class,遇到一个奇怪的问题

django — Thu, 17 Jan 2008 11:48:00 GMT

有两个类,一个CustomServer,一个WebSite,直接看代�?

public class CustomService {
  private long id;
  private List<WebSite> trustedSites;
  private List<WebSite> blockedSites;

  public CustomService() {
    this.trustedSites = new ArrayList<WebSite>();
    this.blockedSites = new ArrayList<WebSite>();
  }

  public List<WebSite> getBlockedSites() {
    return blockedSites;
  }

  public void setBlockedSites(List<WebSite> blockedSites) {
    this.blockedSites = blockedSites;
  }

  public long getId() {
    return id;
  }

  public void setId(long id) {
    this.id = id;
  }

  public List<WebSite> getTrustedSites() {
    return trustedSites;
  }

  public void setTrustedSites(List<WebSite> trustedSites) {
    this.trustedSites = trustedSites;
  }

  public void addTrustedSites(String site, boolean isNewData) {
    this.trustedSites.add(new WebSite(site, isNewData));
  }

  public void addBlockedSites(String site, boolean isNewData) {
    this.blockedSites.add(new WebSite(site, isNewData));
  }
}

public class WebSite {
  private String website;
  private boolean isNewData;

  public WebSite() {

  }

  public WebSite(String website) {
    this.website = website;
  }

  public WebSite(String website, boolean isNewData) {
    this.website = website;
    this.isNewData = isNewData;
  }

  public boolean isIsNewData() {
    return isNewData;
  }

  public void setIsNewData(boolean isNewData) {
    this.isNewData = isNewData;
  }

  public String getWebsite() {
    return website;
  }

  public void setWebsite(String website) {
    this.website = website;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }
    if (obj == null) {
      return false;
    }
    if (getClass() != obj.getClass()) {
      return false;
    }
    final WebSite other = (WebSite) obj;
    if (this.website == null || !this.website.equals(other.website)) {
      return false;
    }
    if (this.isNewData != other.isNewData) {
      return false;
    }
    return true;
  }

  @Override
  public int hashCode() {
    int hash = 7;
    hash = 13 * hash + (this.website != null ? this.website.hashCode() : 0);
    hash = 13 * hash + (this.isNewData ? 1 : 0);
    return hash;
  }

}

xml version="1.0"?>
DOCTYPE hibernate-mapping PUBLIC
    "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
    "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping package="model.cnm.cf">
  <class name="CustomService" table="custom_services">
    <id name="id" column="id" type="long">
      <generator class="native"/>
    id>
    <list name="trustedSites" table="cf_trusted_sites" cascade="all">
      <key column="service_id"/>
      <list-index column="pos"/>
      <composite-element class="WebSite">
        <property name="website" column="site" type="string"/>
        <property name="isNewData" column="isNewData" type="boolean"/>
      composite-element>
    list>
    <list name="blockedSites" table="cf_blocked_sites">
      <key column="service_id"/>
      <index column="pos"/>
      <composite-element class="WebSite">
        <property name="website" column="site" type="string"/>
        <property name="isNewData" column="isNewData" type="boolean"/>
      composite-element>
    list>
  class>
hibernate-mapping>

CustomService有两个WebSite的list,map��C��同的�?接下来是��试代码.

1 public class CustomServiceTest extends BaseDaoTestCase {
2   private CustomService service;
3   private long id;
4
5   @Test
6   public void save() {
7     session = HibernateUtil.getSession();
8     service = new CustomService();
9     service.addBlockedSites("www.whitehouse.com", true);
10     service.addBlockedSites("www.whitehouse.com", false);
11
12     service.addTrustedSites("www.google.cn", true);
13     service.addTrustedSites("www.google.cn", false);
14
15
16     session.save(service);
17     id = service.getId();
18     session.flush();
19     session.close();
20
21     session = HibernateUtil.getSession();
22     Transaction tr = null;
23     try {
24       tr = session.beginTransaction();
25       session.save(service);
26     } catch (Exception e) {
27       if (tr != null) {
28         tr.commit();
29       }
30     } finally {
31       session.close();
32     }
33
34     session = HibernateUtil.getSession();
35     service = getService();
36     assertEquals(2, service.getBlockedSites().size());
37     assertEquals(2, service.getTrustedSites().size());
38   }
39
40   private CustomService getService() {
41     return (CustomService) session.get(CustomService.class, id);
42   }
43
44
45 }

�q�样写测试是可以�q�得,但如果从22�?32行改成下面的样子,service.getBlockedSites().size()�?/span>service.getTrustedSites().size()通通都变成�?.

1 session = HibernateUtil.getSession();
2 session.save(service);
3 session.flush();
4 session.close();

真的是很奇�?貌似只有�W�二�ơsave的时候的提交方式不一�?
又给CustomService加了一个name字段,�l�果表明,在直接用session.flush()和session.close()的时�?�Ҏ��没有提�?不过奇怪的�?�W�一�ơ这样做怎么会提交了.

django 2008-01-17 19:48 发表评论

netbeans6.0 vs eclipse3.3

django — Wed, 26 Dec 2007 09:48:00 GMT

工作上一直用eclipse�Q�最�q��用了一些netbeans�Q�发觉netbeans�q�是一如既往的慢�Q�有点失望�?br />��单的�Ҏ��一下吧�?br />先说�~�点吧：

速度慢。有时候editor最大化要点好几�ơ才work。如果打开大的project�Q�eclipse虽然慢但�q�可以work�Q�netbeans基本上就��d��那儿了�?/li>
今天发现有时候键盘会失去响应�?/li>
Junit test�Q�如果测试fail的话�Q�比如说assertNull("xxx should be null", "string")�Q�fail掉以后，message “xxx should be null"需要到output的窗口才可以看到�Q�eclipse整合��C��个窗口了�?/li>
插�g偏少�Q�比如说hibernate的插�Ӟ��groovy的插件�?/li>
在我的linux下，错误提示都是��q��...

优点�Q?br />

For ruby和rails的版本还蛮好用的�?/li>
觉得最好用的就是code template�Q�eclipse上不能用tab键trigger�Q�而且eclipse里面允许重名的template�Q�所以还要选，哪怕只有一个template。而且�Q�eclipse里template只能在编辑java里��用�?br />

django 2007-12-26 17:48 发表评论

AJAX on java FAQ (zt)

django — Tue, 16 Oct 2007 05:46:00 GMT

https://blueprints.dev.java.net/ajax-faq-zh.html#ajax

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Tags: java, ajax

django 2007-10-16 13:46 发表评论

django — Wed, 10 Oct 2007 03:10:00 GMT

可以用的上的有：

Main-Class 指定�E�序的入口，�q�样可以直接用java -jar xxx.jar来运行程序�?/li>
Class-Path 指定jar包的依赖关系�Q�class loader会依据这个�\径来搜烦class�?/li>

和versioning�Q�seal有关的，看得懂什么意思，但是不知道会怎样被用到。惭�?..有�h知道么？

Blogged with Flock

Tags: java

django 2007-10-10 11:10 发表评论

解决2000下设�|�classpath时报the input line is too long

django — Mon, 08 Oct 2007 14:45:00 GMT

�?000下命令行长度好像不能��过2k bytes,��过��׃��报input line is too long.起java�E�序的时�?如果依赖的jar包很�?classpath一定很�?�q�时候会没办法运�?Google了一�?也没扑ֈ�比较满意的答�?
最�W�的办法��是把用到的jar包重新再打一�?打成一�?后来在网上看��C��讲manifest.mf的文�?了解到manifest.mf里面可以通过Class-Path来设�|�jar包所依赖的包.试了一�?�q�真的ok.只要在build自己�E�序的jar包的时�?在manifest.mf里面加上依赖的jar�?�q�样在用bat��L��序的时�?��׃��用再在classpath里面加这些jar包了.不过build.xml会变得变态一�?比以前稍微难�l�护一�?有一炚w��要注意的��是,manifest.mf里面Class-Path的�\径是相对其所在的jar包的.比如说这个manifest.mf是包含在test.jar�?那么Class-Path里指定的jar包都是相对于test.jar所在的路径.
有空学习一下manifest的其他的用�?

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Tags: java

django 2007-10-08 22:45 发表评论

Jetty, a lightweight java web server?

django — Sat, 29 Sep 2007 09:34:00 GMT

最�q�要学tapestry�Q�不想用tomcat�Q�想换个轻量�U�一点的web server�Q�于是找��C��jetty。猜一下这个lightweight的server有多大？zip�?2m...而且有超多的jar�?..不知道�?么用..��Z��么不像hsqldb一��P��一个jar包搞�?..奇怪的是，�q�有一个单独的startup.jar�Q�而且其他的jar包还必需攑֜�和它同目�?的lib目录一下，才可以�v�?.. 刚看了一下tomcat�Q?.0的tar包只�?.7m...Can I say jetty sucks?

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Tags: java

django 2007-09-29 17:34 发表评论

A Hibernate util written by groovy

django — Wed, 20 Dec 2006 14:54:00 GMT

Hibernate.groovy

import org.hibernate.cfg.Configuration
import org.hibernate.Session
import org.hibernate.SessionFactory
import org.hibernate.Transaction
import org.hibernate.tool.hbm2ddl.SchemaUpdate

class Hibernate {
    def static sessionFactory
    static {
        try {
            Configuration cfg = new Configuration()
            cfg.configure()
            new SchemaUpdate(cfg).execute( true , true )
            sessionFactory = cfg.buildSessionFactory()
        } catch (Exception e) {
            e.printStackTrace()
        }
    }

    Hibernate() {}

     private Session getSession() {
         return sessionFactory.openSession()
    }

    Object execute(closure) {
        def s = getSession()
            def tr = null
            def result = null
             try {
                tr = s.beginTransaction()
                    result = closure.call(s)
                    tr.commit()
            } catch (Exception e) {
                e.printStackTrace()
                     if (tr != null ) {
                        tr.rollback()
                    }
            } finally {
                s.close()
            }
         return result
    }

     void saveOrUpdate(obj) {
        def saveClosure = { s -> s.saveOrUpdate(obj) }
        execute(saveClosure)
    }

    List executeQuery(hql) {
        execute({ s -> s.createQuery(hql).list() })
    }

    List executeQuery(hql, parameters) {
        def query = { s ->
            def q = s.createQuery(hql)
                 if (parameters != null ) {
                     for (i in 0 ..parameters.size() - 1 ) {
                        q.setParameter(i, parameters[i])
                    }
                }
            q.list()
        }
        execute(query)
    }

    def get(clazz, id) {
         return execute({ s -> s.get(clazz, id) })
    }

     void delete(obj) {
        execute({ s -> s.delete(obj) })
    }
}

Instead of interface, I use Closure for callback

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Tags: hibernategroovy

django 2006-12-20 22:54 发表评论

使用httpclient发送soap message

django — Mon, 18 Dec 2006 15:30:00 GMT

�q�两天在写一个tr069的simulator,原理很简单啦,用httpclient模拟tr069的client�?发送soap message到我们的acs server.

发送soap message的代码如�?

public class MessageSender {
/**
* Logger for this class
*/
private static final Log logger = LogFactory.getLog(MessageSender.class);

private HttpClient httpClient;
private PostMethod postMethod;
private MessageFactory messageFactory;
private String url;
private NameValuePair sessionId;

public MessageSender(String ip){
this.httpClient = new HttpClient();

try {
this.messageFactory = MessageFactory.newInstance();
} catch (SOAPException e) {
logger.error(e.getMessage());
}

this.url = generateRequestUrl(ip);
}

private String generateRequestUrl(String ip) {
return "http://" + ip + ":8080/vantage/TR069";
}

public SOAPMessage sendMessage(SOAPMessage input) throws IOException, SOAPException {
this.postMethod = new PostMethod(this.url);
byte[] dataAsBytes = null;

if (input == null) {
logger.debug("Send a empty post");
dataAsBytes = new byte[0];
} else {

ByteArrayOutputStream data = new ByteArrayOutputStream();
input.writeTo(data);
dataAsBytes = data.toByteArray();
}

RequestEntity entity = new ByteArrayRequestEntity(dataAsBytes);
this.postMethod.setRequestEntity(entity);

if (this.sessionId != null) {
this.postMethod.addParameter(this.sessionId);
}

this.httpClient.executeMethod(this.postMethod);

sessionId = this.postMethod.getParameter("SessionID");

InputStream in = this.postMethod.getResponseBodyAsStream();

if (null == in) {
return null;
}

return this.messageFactory.createMessage(null, in);
}
}

最初的code里面,只有一个PostMethod,�q�样每次会一直keep一个http�q�接.因�ؓ在server�?只直接用http session来保存server的状态的,所以必��要是保持是一个session.用一个PostMethod可以做到�q�点.不过奇怪的�?在发�W�二�ơ请求的时�?怎么都拿不到http connection.也不知道是不是httpclient的bug.后来才每�ơ调用都重新create一个PostMethod,但是把第一�ơ得到的sessionID add�q�去.

django 2006-12-18 23:30 发表评论

inverse tip on hibernate

django — Mon, 11 Dec 2006 15:14:00 GMT

所有双向的兌��必须有一端被讄��为inverse.在一对多兌��?它必��M��表多的一�?在多对多�?可以��L��选取一�?

inverse会媄响到save时候的行�ؓ。如果一端的inverse设�ؓtrue�Q�则save应该在另一端进�?/p>

django 2006-12-11 23:14 发表评论

一份简单跟我风格比较一致的coding style

django — Mon, 27 Nov 2006 08:18:00 GMT

Introduction

The Java language gives you all the room you need to write code that would be very difficult for others to understand. Java also permits you to write code that is very easy to understand. Most development teams would prefer the latter.

A style guide provides provides a map so that the code generated by a group of programmers will be consistent and, therefore, easier to read and maintain. Many people do not care for the style guide offered by Sun. This document is one alternative.

This document covers most areas where there could be confusion or difference of opinion. Areas that have never been a problem in our experience are undocumented.

1 - Formatting

1.1 - Indentation

examples and reasoning

examples

reasoning and examples

1.2 - Spacing

if

while

for

switch

catch

examples

1.3 - Class Member Ordering

class Order
{
    // fields

    // constructors

    // methods
}

1.4 - Maximum Line Length

reasoning

1.5 - Parentheses

2 - Identifiers

All identifiers use letters ('A' through 'Z' and 'a' through 'z') and numbers ('0' through '9') only. No underscores, dollar signs or non-ascii characters.

2.1 - Classes and Interfaces

All class and interface identifiers will use mixed case. The first letter of each word in the name will be uppercase, including the first letter of the name. All other letters will be in lowercase, except in the case of an acronym, which will be all upper case. (examples)

2.2 - Packages

Package names will use lower case characters only. Try to keep the length under eight (8) characters. Multi-word package names should be avoided. (examples)

2.3 - All Other Identifiers

examples and reasoning

(reasoning and examples)

3 - Coding

3.1 - Constructs to Avoid

do..while

examples and reasoning

return

reasoning

continue

reasoning

break

reasoning

3.2 - Do Not Compound Increment Or Decrement Operators

Use a separate line for an increment or decrement. (examples and reasoning)

Never use pre-increment or pre-decrement (examples and reasoning)

3.3 - Initialization

examples

3.4 - Access

4 - Self-Documenting Code

				"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

Rather than trying to document how you perform a complex algorithm, try to make the algorithm easier to read by introducing more identifiers. This helps in the future in case the algorithm changes but someone forgets to change the documentation. (examples and reasoning)

原文链接�?http://www.javaranch.com/style.jsp

django 2006-11-27 16:18 发表评论

Using PropertyPlaceHolderConfigurer to separate configuration files in spring

django — Thu, 23 Nov 2006 15:53:00 GMT

First of all, add a bean in spring's configuration files like this:



            ...property files



Put the property files under classpath, then you can use ${property name} to reference properties in your property files in your spring configuration files.
Also, system properties and properties sent it by -D are also available through ${property name}.

django 2006-11-23 23:53 发表评论

使用Spring中的Resource接口隔离�Ҏ��件系�l�的依赖

django — Sun, 19 Nov 2006 03:54:00 GMT

在项目中,�l�常要用到读�pȝ��文�g.在项目的遗留代码�?都是在系�l�启动是传入一个APP_HOME,然后�Ҏ��相对路径去读文�g.�q�样做的�~�点是比较难��试,而且自动化的��试更难.

比如说有�q�样一个类Server,要根据server.properties来初始化,一开始的代码是这��L��:

import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;
import java.util.Properties;

/**
* @author sting
*/
public class Server {
private static final String FILE = "conf" + File.separator + "server.properties";

public void initial() throws IOException {
FileInputStream in = new FileInputStream(System.getProperty("APP_HOME") + File.separator + FILE);
Properties properties = new Properties();
properties.load(in);
// initial
}
}

文�g路径和文件名都是hard code,很难��试. 我们首先把initial()重构一�?代码如下:

public void initial(InputStream in) throws IOException {
Properties properties = new Properties();
properties.load(in);
// initial
}

臛_��,��试�?我们可以传进来自��q��InputStream,也可以方便的时候测试用的server.properties,或者干脆��用内联的文�g,代码如下:

class ServerTest extends TestCase {
private Server server;

public void setUp() throws Exception {
this.server = new Server();
}

public void testInitial() throws Exception {
String serverProperties = "port=8080\n" +
"run_mode=normal";
InputStream in = new ByteArrayInputStream(serverProperties.getBytes());

this.server.initial(in);
// assert
}
}

但是,在实际工作的代码�?文�g名和路径依然要hard code�q�代码中.�q�时,我们可以使用spring中的Resource接口来进一步改�q�我们的代码.

public class Server {
private Resource resource;

public void setResource(Resource r) {
this.resource = r;
}

public void initial() throws IOException {
Properties properties = new Properties();
properties.load(this.resource.getInputStream());
// initial
}
}

再加一�D�spring的配�|�文�?

�q�样,Server的代码完全与文�g的具体�\径和文�g名无�?仅仅用配�|�文件就可以指定,表达更清�?也更易于��试.

当然,仅限于已�l��用spring的项�?

django 2006-11-19 11:54 发表评论

django — Fri, 23 Jun 2006 16:27:00 GMT

被测试的�c? Buffer.java

package test;

import java.util.HashMap;
import java.util.Map;

/**
*
* @author sting
*/
public class Buffer {
    private static Buffer me = new Buffer();

    public static Buffer getInstance() {
        return me;
    }

    private Map buff;

    private Buffer() {
        this.buff = new HashMap();
    }

    public void put(String key, int value) {
            if (!(this.buff.containsKey(key))) {
                this.buff.put(key, value);
        }
    }

    public int get(String key) {
            if (this.buff.containsKey(key)) {
                return this.buff.get(key);
            }
            return 0;
    }
}

TestCase: BufferTest.java
package test;

import net.sourceforge.groboutils.junit.v1.MultiThreadedTestRunner;
import net.sourceforge.groboutils.junit.v1.TestRunnable;
import junit.framework.TestCase;

/**
*
* @author sting
*/
public class BufferTest extends TestCase {
    private Buffer buff;

    protected void setUp() throws Exception {
        super.setUp();
        buff = Buffer.getInstance();
    }

    protected void tearDown() throws Exception {
        super.tearDown();
    }

    public void test() throws Throwable {
        TestRunnable[] runnables = new TestRunnable[] {
                new WriteToBuffer(buff, 10),
                new GetFromBuffer(buff, 10)
        };

        MultiThreadedTestRunner testRunner =
                new MultiThreadedTestRunner(runnables);
        testRunner.runTestRunnables();
    }

    private static class WriteToBuffer extends TestRunnable {
        private int value;
        private Buffer buff;

        public WriteToBuffer(Buffer buff, int value) {
            this.buff = buff;
            this.value = value;
        }

        @Override
        public void runTest() throws Throwable {
            buff.put("sting", value);
        }
    }

    private static class GetFromBuffer extends TestRunnable {
        private int value;
        private Buffer buff;

        public GetFromBuffer(Buffer buff, int value) {
            this.buff = buff;
            this.value = value;
        }

        @Override
        public void runTest() throws Throwable {
            assertEquals(value, buff.get("sting"));
        }
    }
}

�q�行该test case�Q�结果如下：
WARN [Thread-1] (MultiThreadedTestRunner.java:276) - A test thread caused an exception.
junit.framework.AssertionFailedError: expected:<10> but was:<0>
    at junit.framework.Assert.fail(Assert.java:47)
    at junit.framework.Assert.failNotEquals(Assert.java:282)
    at junit.framework.Assert.assertEquals(Assert.java:64)
    at junit.framework.Assert.assertEquals(Assert.java:201)
    at junit.framework.Assert.assertEquals(Assert.java:207)
    at test.BufferTest$GetFromBuffer.runTest(BufferTest.java:75)
    at net.sourceforge.groboutils.junit.v1.TestRunnable.run(TestRunnable.java:154)
    at java.lang.Thread.run(Unknown Source)

把Buffer.java加上同步处理�Q?br />public class Buffer {
    private static Buffer me = new Buffer();

    public static Buffer getInstance() {
        return me;
    }

    private Map buff;

    private Buffer() {
        this.buff = new HashMap();
    }

    public void put(String key, int value) {
        synchronized (this) {
            if (!(this.buff.containsKey(key))) {
                this.buff.put(key, value);
            }
        }
    }

    public int get(String key) {
        synchronized (this) {
            if (this.buff.containsKey(key)) {
                return this.buff.get(key);
            }
            return 0;
        }
    }
}

��试通过�?br />
�q�里只是用最��单的code演示了一下如何��用GroboUtils里面提供TestRunnable�?/font>MultiThreadedTestRunner来编写多�U�程的测试代码。其实也可以自己写code��L��试，不过已经有�h写了�Q�不用再重复��d��了。Please refer to http://broboutils.sourceforge.net to get more information.

django 2006-06-24 00:27 发表评论