New Macbook Pro release

新的Apple Macbook Pro已經更新了

不過只有一句話 真的很貴! Orz，反而教育價比較有誠意一點ooxx

暫時先等國外的評論，再好好做決定

rTorrent 推薦設定

讓rtorrent跑得更順更安性兩個設定

• vim .rtorrent.rc
• 參考Optimize Your BitTorrent Download Speed

min_peers = 40
max_peers = 52  
max_uploads = 10
download_rate = 0 
upload_rate = 10  

• 啟動Bittorrent Protocol Encryption

Protocol encryption (PE), message stream encryption (MSE), or protocol header encrypt (PHE)[1] are related features of some peer-to-peer file-sharing clients, including BitTorrent clients. They attempt to enhance privacy and confidentiality. In addition, they attempt to make traffic harder to identify by third parties including internet service providers (ISPs).

# The example value allows incoming encrypted connections, starts unencrypted
# outgoing connections but retries with encryption if they fail, preferring
# plaintext to RC4 encryption after the encrypted handshake
encryption = allow_incoming,try_outgoing,enable_retry

rTorrent 推薦設定

abs for rtorrent client

rtorrent是目前常用torrent console client，利用Archlinux abs編譯達到優化rtorrent目的

1. 更新Archlinux abs tree

 sudo abs 

2. 將更新rtorrent至home

 cp -r /var/abs/community/rtorrent/ ~/abs 

3. 修改vim PKGBUILD, 加入-with-posix-fallocate用來降低filesystem fragmentation

#./configure --prefix=/usr --disable-debug --with-xmlrpc-c || return 1
./configure --prefix=/usr --disable-debug --with-posix-fallocate|| return 1

4. compile rtorrent

 makepkg -s 

5. 安裝rtorrent package

sudo pacman -U rtorrent-0.8.6-2-i686.pkg.tar.gz 
Password: 
loading package data...
checking dependencies...
(1/1) checking for file conflicts                   [######################] 100%
(1/1) upgrading rtorrent                            [######################] 100%

Hibernate 3.5.0 final release

終算釋放新版了，似乎等了滿久!

3.5.0 版本中新增一些期待滿久的特性：

• JSR 317(JPA)支援　
• 整合hibernate-anootaitons, hibernate-entitymanager, hibernate-enver至核心中
• 新增標準Infinispan as second-level cache 支援
• 加強"read only" / "immutable" 支援
• 支援JDBC 4
• 支援column-level read/write fragments (HBM only for now)
• Initial support for fetch profiles (不知道什麼東西)

Phase 1 will focus on the API and the metadata infastructure needed to support fetch profiles. It will also provide implementation for using the join strategy.

個人所期待支援就是JPA2，JPA1在查詢支援及彈性不是這麼理想，不過這一次修正似乎滿多關於second-level cache問題

Hibernate 3.5.0 final release

start sshd in Mac

最近工作機換成Mac min i,一切又是新的感覺，等待新的macbook pro。 sudo /usr/libexec/sshd-keygen-wrapper sudo /usr/sbin/sshd -i

Full system upgrade in ARch linux

pacman -Syu

一行指令更新系統同時synchronize the repository

最近接觸Arch Linux 設計理念真的很不錯，似乎可以考慮好好使用它。

Java Native Method

很少有機會接觸native method，平時都是拿java來實作webapp，在追縱一段程式發現為什麼程式只有宣告而沒有實作而且還用上native keyword，好奇心想要瞭解為什麼要用java native method?

The Java Native Interface (JNI) is a programming framework that allows Java code running in a Java Virtual Machine (JVM) to call and to be called[1] by native applications (programs specific to a hardware and operating system platform) and libraries written in other languages, such as C, C++ and assembly.

大致上會用到JNI應該有下面幾個原因：

• 需要呼叫O.S應用
• 舊系統(c, c++, win32)
• 搞Embedded System
• performance考量

利用native method可以在java 環境中呼叫外部資源，但是在很多地方我想應該是沒有這麼容易可以解決，不過算是又進一步瞭解java可以幫我們做些什麼事，有空寫一個Hello World來測試。