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叱咤�U��h — Thu, 24 Feb 2011 01:30:00 GMT

摘要: 当系�l�有��量数据需要��联删除时�Q�我们需要小心，如果同步删除用户体验会很差，他会�{�相当长的时��_��直到�pȝ��时�Q�另外还会给�pȝ��H�发地增加很大的负蝲�Q?nbsp; 阅读全文

叱咤�U��h 2011-02-24 09:30 发表评论

Mysql水��^分表

叱咤�U��h — Tue, 22 Feb 2011 02:06:00 GMT

摘要: Mysql在数据量大的情况下，会遇到水�q�_��表的情况。将实际开发中遇到的分表解��x��案�ȝ��了一下�?nbsp; 阅读全文

叱咤�U��h 2011-02-22 10:06 发表评论

Redis List

叱咤�U��h — Thu, 30 Dec 2010 10:06:00 GMT

摘要: 存放几百万条数据的Redis List的性能描述�Q��用小�l�，�q��上一个��y妙的使用例子�?nbsp; 阅读全文

叱咤�U��h 2010-12-30 18:06 发表评论

抛弃TT/TC�Q�拥抱Redis

叱咤�U��h — Fri, 05 Nov 2010 08:14:00 GMT

1.我们需要复杂和灉|��的数据结构如List�Q?/span>Set�Q��?/span>TT/TC table支持的是�c�M��于简单的单表�l�构。我们先前是�?/span>TC Hash模拟出来�?/span>List�Q�但在删除，分页�Q�清理上都存在难度。维护�v来也不方�ѝ��功能上Redis更适合我们的需求�?/span>

2.TT/TC java客户端比较弱�Q�目前只能用memcached java client

3.Redis对�ƈ发操作提供了很多方便�?/span>API调用

4.Redis性能上比TC table要好些，�?/span>TC B+ tree差不�?/span>

5.Redis�q�发处理能力要好�?/span>

我们现在使用的模式是�Q�对于直接的key value寚w��~�存的直接用memcached。对�?/span>collection�c�d��׃��?/span>Redis。对于大数据量的内容性的东西�Q�我们打��尝试用mongoDB。也正在学习neo4j�Q�来应对深度搜烦�Q�推荐功能�?/span>

叱咤�U��h 2010-11-05 16:14 发表评论

蛋疼的PooledConnectionFactory(activemq-pool)

叱咤�U��h — Tue, 02 Nov 2010 00:55:00 GMT

摘要: Activemq-pool的PooledConnectionFactory解密�Q��用时需要注意�?nbsp; 阅读全文

叱咤�U��h 2010-11-02 08:55 发表评论

不用keytool�Q�tomcat打开https

叱咤�U��h — Fri, 13 Aug 2010 17:06:00 GMT

摘要: �|�上大多数文章都是用keytool生成自签名根证书�Q�将根证书配�|�在tomcat的server.xml中。我不太喜欢用keytool�Q�原因：
1.我们可能换provider�Q�不同的provider会有不同的算法实玎ͼ��法的安全性和性能也可能不同，通过代码生成比较方便一些，不同��法的实现要攑֜�classpath上�?
2.通过代码生成�q�有一个好处，会对整个��程理解的比较清楚，实现的原理到底是怎样的�?nbsp; 阅读全文

叱咤�U��h 2010-08-14 01:06 发表评论

RDBMS的lucene爬虫

叱咤�U��h — Thu, 06 May 2010 23:12:00 GMT

摘要: Lucene如何和数据库集成�Q�如何从数据库中实时地将数据爬出�Q�在Lucene中徏索引。本文没有��用AOP和ORM FRM的Listener方式�Q�而是采用的主动轮询的方式从DB��确实存在在DB中的指定数据爬出�Q�徏全文索引。可以让用户实时地搜出结果。需要考虑的问题很多，我只是把我能惛_��的给出来。如果大家有什么好的想法和��Q�欢�q�提出来�?nbsp; 阅读全文

叱咤�U��h 2010-05-07 07:12 发表评论

提高遗留代码的测试覆盖率

叱咤�U��h — Wed, 10 Mar 2010 09:23:00 GMT

摘要: A��目一开始code的时候，没有加�Q何test。现在需要重构了�Q�我们根据use case设计了一些automation的high level 的接�q�integration test的functional tests. 但跑下来发现code coverage不高。于是老大让我看看想些�Ҏ��提高一下code coverage。�ȝ��一下�?nbsp; 阅读全文

叱咤�U��h 2010-03-10 17:23 发表评论

叱咤�U��h — Wed, 03 Feb 2010 23:25:00 GMT

摘要: javamail已经设计的很好了�Q�精巧强悍，��Z��么还需要封装它呢？阅读全文

叱咤�U��h 2010-02-04 07:25 发表评论

在JavaMail的基��上构��q��Email Channel(1):基础知识

叱咤�U��h — Sat, 16 Jan 2010 04:33:00 GMT

摘要: 最�q�在javamail的基��上，写了一个Email channel�Q�把相关知识�ȝ��一下�?nbsp; 阅读全文

叱咤�U��h 2010-01-16 12:33 发表评论

OC4J升��Oracle JDBC driver版本

叱咤�U��h — Fri, 15 Jan 2010 05:17:00 GMT

摘要: OC4J1033升��Oracle JDBC driver�?1.1.0.7.0版本阅读全文

叱咤�U��h 2010-01-15 13:17 发表评论

2009�q�工作�ȝ��

叱咤�U��h — Wed, 06 Jan 2010 06:40:00 GMT

CUSTOMER FOCUS

Be patient to listen to application users to speak out their requirements. Try best to satisfy all the reasonable requirements put forward by them. Suppose and analyze their potential requirements and guide them, differentiate urgent and uncritical requirements. Put customer requirements at the first place.

耐心的們֐�客户阐述他们的需求，��量满��用户提出的所有需求，猜想�q�分析用户可能需要的潜在需求，引导他们。区别紧急和不重要的需求。将用户的需求放在第一位�?/span>

RESULT ORIENTATION

Strive to be complete tasks on time or ahead of its mandate, and deliver mature products

力争提前完成自己的�Q务，交付成熟的��?/span>

ACHIEVEMENT DRIVE

If our outputted software solves customers’ problems, it is a sense of accomplishments to us. Software with clear architecture, good scalability, high readability and maintainability always make me feel comfortable.

写出的��Y件解决了客户的问题本�w�就是一�U�成��感。写出的软�g架构清晰�Q�可��L��强�Q�可�l�护性高也会使�h开心�?/span>

TEAMWORK

Usually discussing and solving problems with team members, studying new techs and sharing with partners, Learning from each other and making progress, developing projects with my team members.

和小�l�成员一赯��论，研究和解军_��U�问题，合作开发项目，事半功倍，互相学习�Q�不断进步�?/span>

COMMUNICATION

Firstly, I learn to be a pro-listener to understand each other’s intensions. Then, I organize my own thoughts, and speak out swimmingly in a way accepted by the other ones.

学做亲听�?/span>,了解�Ҏ��的意�?/span>,换位思�?/span>, �l�织好自��q��x��,用对方能接受的方式畅快的表达出来.

INNOVATION

Technical innovation always happens, only through continuous research and creations, individuals are able to achieve greater efficiency to the company.

技术是不断革新的，只有通过个�h的不断学习和创新才能为公司取得更大的效益�?/span>

LEADERSHIP

In the passed half year, I have pursued the implementation of rules of baselines.

在过�ȝ��半年内，曑֜��组内部推行baseline的规�?/span>

PROBLEM SOLVING & DECISION MAKING

A major duty of framework developer is when there is some difficult technical problem coming out with frameworks or products, I need to respond to application user and solve the problem ASAP. Sometimes, framework developer needs to make decision on used technologies, even the whole architecture.

Framework开发者重要职责就是对用户出现技术难题的时候能够快速响应�ƈ解决。��^旉��要有能力寚w��用的技术和架构作出军_��

MNAGING RELATIONSHIP

Application user is our nice customers, it is important to make a solid relationship with them. I often help my team members to solve difficult technical problems, cooperate with them to complete projects.

Application team是我们的客户�Q�需要和他们打好关系。经常帮助小�l�成员解决一些技术问题，共同合作完成��目的开发�?/span>

叱咤�U��h 2010-01-06 14:40 发表评论

叱咤�U��h — Fri, 25 Dec 2009 07:09:00 GMT

Log4j debug log api不够丰富

在进入，退出方法时针对�Ҏ��的输入参数和�q�回��D��行log�Q�log中含有方法信�?/span>

logDebugOnMethodEntry, logDebugOnMethodExit

log�U�别问题

如果log�U�别讄��的是info�Q�会把warning�Q�error�Q�fatal都打出来�Q�各个��别不能单独控制。增加各�U�别分开控制开兟�?/span>

log格式的定�?/span>

可以定制log信息的pattern�Q�这样会看�v来很�l�一�Q�log分析��h��也容易logDebug(String pattern, Object... paramValues);

�q�有一个好处，不需要预先把相关String都append��h��Q�提高performance

log.isDebugEnabled();

参考第三点�Q�这样就避免了Object的toString和String的concat操作�?/span>

EmptyLogger

每次记log�Ӟ��log4j都需要判断这个��别是否可以打log。如果logger的每个��别都有对应的logger实例�Q�如果debug level被关了，debug�U�别对应的实例就是EmptyLogger�Q�EmptyLogger里面所有方法的实现都是�I�的�Q�就不需要这额外的判断了�?/span>

叱咤�U��h 2009-12-25 15:09 发表评论

叱咤�U��h — Sun, 29 Nov 2009 05:37:00 GMT

摘要: 在用户修改了领域对象的值后�Q�我们有旉��要记录下用户的改动。比如对一些关键业务对象的改动有时往往需要发邮�g通知客户。有时用户可能想查阅所有历史的改动�Q�甚��x��可能会改回原先的倹{�?领域逻辑关系往往比较复杂�Q�这时我们会使用到ORM Framework。本文以toplink��Z��Q�讲�q�如何利用toplink�~�写一个完成此功能的简易Framework�Q�我们暂且把它称为ActionMemed�?.. 阅读全文

叱咤�U��h 2009-11-29 13:37 发表评论

剥下“java.lang.OutOfMemoryError: unable to create new native thread”的外衣

叱咤�U��h — Fri, 25 Sep 2009 02:55:00 GMT

摘要: 在一个月黑风高的晚上�Q��品环境上所有application都OOM了，令�h心惊胆寒�Q�打开log文�g�Q�上下打谅着他，他就是传说中的“java.lang.OutOfMemoryError: unable to create new native thread‘，到底谁创造出了这个魔��|��原来一个application在疯狂创建线�E�池�Q�不�q�用TDA(Thread dump analyzer)看到也就只创��Z��400×2�Q?JVMs�Q�个�U�程�Q�但�q��ƈ不算多，应该�q�可以更多。奇怪！让我们来剥下“java.lang.OutOfMemoryError: unable to create new native thread‘的外衣�Q�看看谁是幕后黑手。。。。�?nbsp; 阅读全文

叱咤�U��h 2009-09-25 10:55 发表评论

Java Jingle

叱咤�U��h — Thu, 10 Sep 2009 23:25:00 GMT

Java Posse上��L��听到�q�首歌，昨天把它download下来�Q�确实还有点意思。呵��c��歌词挺搞笑的，sounds funny
http://blogs.sun.com/dcb/resource/Java.mp3

歌词大意�Q?/strong>

Java by "Loose Bruce" Kerr

Java, Java, Java Java jing-jing-jing
Java, Java, Java Java jing-jing-jing

It's not a cup of coffee but it's hot as can be
Came pourin' through the Gates on a "Big Mac" Nealy
Singin', Java, Java, Java Java jing-jing-jing

Microsoft thought Java really could be a threat
Java through the Windows maybe put them in debt
Gates, he took a license but he altered the feel
Java members all said, "Bill, you're outa the deal!"

Singin', Java, Java, Java Java jing-jing-jing
Java, Java, Java Java jing-jing-jing

It's like a cup of coffee 'cause it's tasty and fresh
But it's not really Java if the flavors don't mesh
Pure Java, Java, Java Java jing-jing-jing

Microsoft released a browser, Java was there
The Sun, it rose and lit up what was really a dare
The RMI, the JNI were missing and lost
Scott said, "Bill, you broke your promise, Now pay the cost!"

Bill said, "Hey, my recipe is richer than yours"
Scott said, "I own the coffee shop, sit down and I'll pour"

Pour Java, Java, Java Java jing-jing-jing
Java, Java, Java Java jing-jing-jing
Nobody can tell yet what the future may bring
All we know is Java goes jing-jing-jing

It goes Java, Java, Java Java jing-jing-jing
(Scott really means it)
Java, Java, Java Java jing-jing-jing
(Bill you better believe it)
Java, Java Java jing-jing-jing

叱咤�U��h 2009-09-11 07:25 发表评论

Unit test学习�ȝ��

叱咤�U��h — Fri, 04 Sep 2009 08:01:00 GMT
     摘要: 最�q�又把压在箱底的几本单元��试相关的书��M��，既然��M��Q�顺便拿了个�W�头��C��讎ͼ�好记性不如烂�W�头呀。内容不��太多，�q�x��写Unit test时要follow�Q�要深入理解�Q�不然就不能学以致用。以后相关的内容�Q�就往�q�个坑里填了�?nbsp; 阅读全文

叱咤�U��h 2009-09-04 16:01 发表评论

叱咤�U��h — Thu, 13 Aug 2009 07:27:00 GMT
     摘要: java端RESTful web services的几�U�实现方�?nbsp; 阅读全文

叱咤�U��h 2009-08-13 15:27 发表评论

叱咤�U��h — Wed, 05 Aug 2009 04:52:00 GMT

现在我们��目几乎都是在servlet的init�Ҏ��中初始化资源�Q�在destroy�Ҏ��里释放资源。servlet的load on startup是有先后��序�Q�但是没有依赖关�p�，如果某个servlet初始化出现异常，不会�l�止剩下的servlet的初始化�Q�这��h��时会使得web application正常启动�Q�但是却部分可用�Q�整个系�l�处于不�E�_��状态。这应该是一�U�不推荐的做法�?br /> 而servlet context listener是在所有servlet初始化之前被调用�Q�同样在所有servlet destroy之前被调用。更关键的是�Q�如果在contextInitialized抛出runtime异常�Q�剩余的listener和所有servlet都不会初始化�Q�解决了web application非正常启动的问题�?br />
以下情况可以使用servlet来初始化资源�Q?/p>      整个�pȝ��只有一个servlet会在�pȝ��启动时初始化资源
     Servlet初始化的资源是独立的�Q�不会媄响整个系�l�的正常�q�行
     Servlet初始化失败后�Q�整个系�l�处于不可被讉K��状�?br />      Container的版本比较旧�Q�不支持servlet2.3或者更新的版本

叱咤�U��h 2009-08-05 12:52 发表评论