Rex IT Blog: 6月 2012

2012年6月30日星期六

How To Choose 32-Bit or 64-Bit JVM
http://www.techpaste.com/2012/02/choose-32-bit-64-bit-jvm/

Default JVM settings GC, JIT and Java Heap Sizes -Xms & -Xmx on different operating systems
http://www.techpaste.com/2012/02/default-jvm-settings-gc-jit-java-heap-sizes-xms-xmx-operating-systems/

Is a JVM's Maximum Heap Size really 1.7 GB?
http://pauldone.blogspot.tw/2008/08/is-jvms-maximum-heap-size-really-17-gb.html

REF:
java - Benefits/drawbacks to running 64-bit JVM on 64-bit Linux server? - Stack Overflow
http://stackoverflow.com/questions/559433/benefits-drawbacks-to-running-64-bit-jvm-on-64-bit-linux-server

Opensource Licenses by Name

http://www.opensource.org/licenses/alphabetical

http://www.ibm.com/developerworks/cn/websphere/library/techarticles/0809_alcott/0809_alcott.html

WebSphere Application Server V7 中的新特性

IBM 的 Java SE 6 中的另一个改进是在 64 位 WebSphere Application Server JVM 中使用压缩引用 (compressed reference)（或指针压缩）。与以前的 32 位 JVM 相比，使用压缩引用可以非常显著地减少 64 位 JVM 的进程内存占用空间。在 IBM 推出 Java SE 6 实现以前，64 位堆的大小为等效的 32 位堆的 1.7 至 2 倍的情况并不鲜见。

IBM JVM:
-Xcompressedrefs

Oracle JVM:
-XX:+UseCompressedOops

Use -Xcompressedrefs in any of these situations:

When your Java applications does not need more than a 25 GB Java heap.
When your application uses a lot of native memory and needs the JVM to run in a small footprint.

REF:
http://publib.boulder.ibm.com/infocenter/javasdk/v6r0/index.jsp?topic=%2Fcom.ibm.java.doc.diagnostics.60%2Fdiag%2Funderstanding%2Fmm_compressed_references.html

http://www.slideserve.com/adamdaniel/improving-64-bit-java-performance-using-compressed-references

16款為Web開發者推薦的Chrome實用外掛

http://inspire.twgg.org/c/programming/dev-tools/16-of-chrome-for-web-developers-recommend-practical-plug-in.html

Javascript 物件導向式程式設計基礎講解

http://inspire.twgg.org/c/programming/javascript/javascript-based-object-oriented-programming-explained.html

2012年6月29日星期五

PostgreSQL License

http://www.postgresql.org/about/licence/

MongoDB 啟用認證 (Secure Mode)

./mongod --auth

ref:
http://www.mongodb.org/display/DOCS/Security+and+Authentication

MongoDB綁定伺服器IP

./mongod --bind_ip 127.0.0.1

MongoDB 授權

AGPL v3.0
http://www.gnu.org/licenses/agpl-3.0.html

授權流言終結者#4：MongoDB 授權的分析與探討（雙重授權模式 2.0） - OpenFoundry
http://www.openfoundry.org/tw/enterprise-application/8687-4mongodb-20

2012年6月28日星期四

GlassFish for Commercial Use

https://blogs.oracle.com/theaquarium/entry/glassfish_for_commercial_use
http://glassfish.java.net/public/CDDL+GPL.html
http://www.openfoundry.org/tw/licenses/2061-cddl

Difference between GlassFish Open Source and Commercial Editions (GlassFish For Business):
https://blogs.oracle.com/GlassFishForBusiness/entry/difference_between_glassfish_open_source

GlassFish Usage Metrics
https://wikis.oracle.com/display/GlassFish/UsageMetrics

使用Jconsole監看Tomcat

http://stackoverflow.com/questions/1263991/connecting-remote-tomcat-jmx-instance-using-jconsole

2012年6月27日星期三

Mozilla Developer Network

https://developer.mozilla.org

Java Servlet Technology

http://www.oracle.com/technetwork/java/javaee/servlet/index.html

JavaServer Pages Technology

http://www.oracle.com/technetwork/java/javaee/jsp/index.html

Java SE Technologies - Database

http://www.oracle.com/technetwork/java/javase/tech/index-jsp-136101.html

Java Technology Case Studies

http://java.sun.com/reference/casestudies/index.html

Oracle Technology Network for Java Developers

http://www.oracle.com/technetwork/java/index.html

MySQL Documentation: MySQL Reference Manuals

http://dev.mysql.com/doc/

WebSphere Application Server BETA Information Centers

http://pic.dhe.ibm.com/infocenter/wasinfo/beta/index.jsp?topic=/com.ibm.websphere.express.doc/info/exp/ae/rweb_webxf.html

Windows Internet Explorer API reference

http://msdn.microsoft.com/en-us/library/ie/hh828809(v=vs.85).aspx

Document Object Model Core

http://www.w3.org/TR/DOM-Level-2-Core/core.html

2012年6月21日星期四

Regex Tester

http://regexpal.com

State Diagram的狀態移轉

http://www.developer.com/design/article.php/2238131/State-Diagram-in-UML.htm

Transition: An arrow indicating the Object to transition from one state to the other. The actual trigger event and action causing the transition are written beside the arrow, separated by a slash. Transitions that occur because the state completed an activity are called "triggerless" transitions.

事件產生後且條件滿足 => 執行Action讓狀態移轉