题记:util和concurrent 包是后续重点先看的和学习的模块 原文地址:http://www.cnblogs.com/sunhan/p/3817806.html CountDownLatch,api 文档:http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/CountDownLatch.html A synchronization aid that allows one or more threads to wait…
引言 狭义的分布式系统指由网络连接的计算机系统,每个节点独立地承担计算或存储任务,节点间通过网络协同工作.广义的分布式系统是一个相对的概念,正如Leslie Lamport所说[1]: What is a distributed systeme. Distribution is in the eye of the beholder.To the user sitting at the keyboard, his IBM personal computer is a nondistributed…
