一.阅读Session接口的注释的理解.(看着注释翻译的,有些地方可能翻译的不太对,有疑问再看源文档) ①.Session的生命周期随着事务开始而开始,事务的结束而结束. 附原文:The lifecycle of a <tt>Session</tt> is bounded by the beginning and end of a logical transaction. (Long transactions might span several database transact…
本文是阅读 http://book.mixu.net/distsys/abstractions.html 的笔记. 第二章的题目是"Up and down the level of abstraction".这一章里面,作者主要介绍了分布式系统里面的一个重要概念:CAP理论. 什么是CAP理论呢?就是说在任何情况下,分布式系统只能满足下面三项中的两个: 一致性(Consistency),这里指的强一致性. 可用性(Availability). 对网络分割容错(Partition tol…
In computer science, digital image processing is the use of computer algorithms to perform image processing on digital images.[1] As a subcategory or field of digital signal processing, digital image processing has many advantages over analog image p…