There are a few strange things about Condition related code in Java concurrency. I’ll use the following code to show you. The code is about one cup and two threads. One thread is trying to fill it, the other to drink from it. The code uses explicit Lock + Condition API. But what I’m going …
Condition variable related code is hard to understand. So let me explain Read More »
First of all, it’s not the same as “compare-and-swap”. Sounds similar, but different. What it does is, Set a variable to a new value Return the old value of the variable It’s a hardware primitive, i.e. atomic. On x86 the instruction is `xchg` (There is actually no “test” , is there? ) What can it …
Here are the tips of my solution: You always push the root to the stack first The most difficult part is: when you see a node on the top of element, should you go on to push its children, or pop it to print it? For pre-order traversal, you can pop it then push …
1. Cache – 几个ns 2. Main Memory – 10-100 ns 3. Secondary Storage(一般是磁盘) – HDD 3-10ms, SSD 0.1ms 4. Tertiary Storage(磁带，DVD) – 秒级或分钟级
内容编译自网络 Binary Search Tree 什么情况下会出现O(n) ? 如果树的根结点没选好，一棵树变成一个列表： 平衡二叉查找树 – 可以自动旋转 参考： http://en.wikipedia.org/wiki/Binary_search_tree http://www.cnblogs.com/huangxincheng/archive/2012/07/21/2602375.html http://www.cnblogs.com/huangxincheng/archive/2012/07/22/2603956.html
一个结点要向注册中心告知自己的IP，应该用本机多个IP中的哪个？ 看这里 http://en.wikipedia.org/wiki/Reserved_IP_addresses，避免使用虚拟IP、多播IP和回环IP.
CONNECTION_TIMEOUT：建立连接超时 SO_TIMEOUT: 读数据超时，如： 引用 SO_TIMEOUT is the timeout that a read() call will block. If the timeout is reached, a java.net.SocketTimeoutException will be thrown
有利于 长连接下的流式转输 摘自 http://en.wikipedia.org/wiki/Chunked_transfer_encoding 引用 Chunked encoding has the benefit that it is not necessary to generate the full content before writing the header, as it allows streaming of content as chunks and explicitly signaling the end of the content
http://autobahn.ws/testsuite
http://www.jcp.org/en/jsr/detail?id=356 Final Release: http://jcp.org/aboutJava/communityprocess/final/jsr356/index.html, 批准于22 May, 2013 并且它是JEE 7规范的一部分