links for 2008-12-27

• 防火长城架构
  整个过程是这样的：客户端发出封包，主干路由接收到后，并不会对这个封包做任何处理。这个封包无论是否存在非法内容，都会被传送到服务器端。但是与此同时，路由器会把这个包复制一份到GFW。GFW接受到拷贝的封包之后，如果发现有违禁内容，就会同时向客户端和服务器端发出几个flag为rst(REST)的封包。
  (tags: gfw)

links for 2008-12-17

• Developer Guide – Protocol Buffers – Google Code
  (tags: google protocol)

links for 2008-12-15

• firstworks: sql relay – sqlrelay persistent database connection pool pooling proxy load balance balancing odbc oracle mysql msql postgresql sybase db2 interbase sqlite access c++ perl DBD DBI python php zope ruby tcl java jni unix linux persistant
  SQL Relay is a persistent database connection pooling, proxying and load balancing system for Unix and Linux.
  SQL Relay is ideal for:
  speeding up database-driven web-based applications
  enhancing the scalability of database-driven web-based applications
  distributing access to replicated databases
  throttling database access
  accessing databases from unsupported platforms
  migrating applications from one database to another
  (tags: db mysql sql cluster Opensource)