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<a class="post-title-link" href="/2017/07/27/20170727-explore-Influxdb/" itemprop="url">
《Influxdb 入门》
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<h1 id="时间序列数据库_Influxdb_入门">时间序列数据库 Influxdb 入门</h1><p>以下内容基于influxdb 1.3<br>influxdb 有一套自己的查询语法，和sql很像，<br><figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line"><measurement>[,<tag-key>=<tag-value>...] <field-key>=<field-value>[,<field2-key>=<field2-value>...] [unix-nano-timestamp]</span><br></pre></td></tr></table></figure></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br></pre></td><td class="code"><pre><span class="line">insert cpu1,host=1,test=11 value=3,a=1 1500986114</span><br></pre></td></tr></table></figure>
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CSAPP读书笔记-并发编程
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<p>首先理解什么是并发？并发是两个或两个以上的执行实例（进程或线程），在单个CPU上交替执行，A开始执行，由于异常事件的发生<br>CPU暂停A执行，开始执行B。B由于异常事件也被暂停执行，CPU重新开始执行A。两个执行实例交替执行时在时间上是有交叉的，这种情况称为并发。<br>他们的执行过程在逻辑上是并发的，但是在物理上依然是串行的。并行是某个时刻有多个执行实例在CPU上执行，并行一般是在多核CPU或者多处理器发生。</p>
<p>现代操作系统提供了3种并发编程的方式：进程级并发，IO多路复用技术，和线程级并发。<br>
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Mac 安装openresty 问题记录
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<p>最近开始学习 openresty 相关的东西，了解了基本的 lua 语法自然需要安装 openresty 了。<br>过程中遇到不少问题，记录下来。<br>Mac 的系统版本是 EI Capitan 10.11.6，openresty 版本是1.9.15.1。</p>
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如何用 openresty + lua 快速搭建一个简单网站
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<p>最近在折腾 OpenResty，OpenResty 就不用多介绍了，这方面国内质量好的资料也不多，<br>如果非要选一个入门级别的资料，自然是《OpenResty 最佳实践》。断断续续看了一些 Lua 的语法和 OpenResty 基础，<br>就想做点什么练练手。碰巧某天。同事介绍了几个 OpenResty 的 lua 库，一看刚刚好，可以做来搭个简单的网站。<br>那么我们就开始吧…</p>
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读《代码整洁之道》一些总结
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2016-08-12
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<h4 id="怎么写好函数？">怎么写好函数？</h4><ul>
<li>函数应该做一件事，只做一件事，做好一件事。</li>
<li>方法：尽可能小，不断抽象，分离结构，抽象层级足够少，最好一个。</li>
<li>面向对象设计五个基本原则（SOLID）之一。这些原则是：单一职责原则、开闭原则、<br>接口隔离原则、里氏替换原则和依赖倒置原则。</li>
<li>函数名通俗易懂，风格统一。</li>
<li>参数越少越好。</li>
<li>做什么事和检查状态应该分离，分离指令和询问。</li>
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