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<a href="/my-2019-summary/" class="post-title-link" itemprop="url">蛋卷的 2019 年度总结</a>
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<time title="Created: 2020-01-01 13:56:08" itemprop="dateCreated datePublished" datetime="2020-01-01T13:56:08+00:00">2020-01-01</time>
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<p>2019 年对于蛋卷来说，是一个重要的人生转折点。在过去的这一年中，我开启了全新的生活方式。告别了父母的管束，可以和 Grace 一起支配属于我们自己的时间。由于有了时间支配上的自由，我在人生的不同方面都有了新的发展。</p>
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<a href="/a-bird-s-eye-view-of-go/" class="post-title-link" itemprop="url">【译】Go 语言概览</a>
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<ul>
<li>原文地址：<a target="_blank" rel="noopener" href="https://blog.merovius.de/2019/06/12/birdseye-go.html">A bird’s eye view of Go</a></li>
<li>原文作者：<a target="_blank" rel="noopener" href="https://blog.merovius.de/">Axel Wagner</a></li>
<li>译文出自：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner">掘金翻译计划</a></li>
<li>本文永久链接：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/birdseye-go.md">https://github.com/xitu/gold-miner/blob/master/TODO1/birdseye-go.md</a></li>
<li>译者：<a target="_blank" rel="noopener" href="https://github.com/JackEggie">JackEggie</a></li>
<li>校对者：<a target="_blank" rel="noopener" href="https://github.com/40m41h42t">40m41h42t</a>, <a target="_blank" rel="noopener" href="https://github.com/JalanJiang">JalanJiang</a></li>
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</blockquote>
<h1 id="Go-语言概览"><a href="#Go-语言概览" class="headerlink" title="Go 语言概览"></a>Go 语言概览</h1><p><strong>本文摘要：本文非常笼统地总结了 Go 语言的定义、生态系统和实现方式，也尽力给出了与不同的需求所对应的参考文档，详情参见本文末尾。</strong></p>
<p>每当我们说起“Go 语言”的时候，可能会因为场景的不同聊到很多完全不同的东西。因此，我尝试着对 Go 语言和其生态系统做一个概述，并在各部分内容中都列出相关的文档（这可能有点像是大杂烩，其中还包含了我最近实际遇到的许多问题）。让我们开始吧：</p>
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<a href="/binary-form-of-int-in-java/" class="post-title-link" itemprop="url">Java 中 int 类型的二进制表示</a>
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<h2 id="原理"><a href="#原理" class="headerlink" title="原理"></a>原理</h2><p>可通过 Integer.MAX_VALUE 和 Integer.MIN_VALUE 查看 int 类型的最大和最小值，分别为 0x7fffffff(2^31-1) 和 0x80000000(2^31)，其中 0 即为 0，正数的最高位为 0，负数的最高位为 1。</p>
<p>Java 中负数的表示方式为正数的补码（例：原码 00，反码 11，补码 00，补码的计算方式为反码加一，此处丢弃溢出位）。采用这种方式的原因是 0 的交叉（zero crossing）问题，即 0 和 -0 需要用同一种方式表示，见补码计算例子。如果采用反码表示负数的话，0 就会有两种表示：所有位全为 0、所有位全为 1。</p>
<p>因此 Java 中 0 的所有位全为 0，1 为 0000…0001，-1 的所有位全为 1，Integer.MAX_VALUE 为 0111…1111，Integer.MIN_VALUE 为 1000…0000。</p>
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<a href="/what-we-ve-learned-about-hiring-engineering-managers/" class="post-title-link" itemprop="url">【译】我们从招聘技术经理的过程中学到了什么</a>
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<li>原文地址：<a target="_blank" rel="noopener" href="https://circleci.com/blog/what-we-ve-learned-about-hiring-engineering-managers/?utm_source=cooperpress&utm_medium=newsletter&utm_campaign=feb19&utm_content=javascript-weekly">What we’ve learned about hiring engineering managers</a></li>
<li>原文作者：<a target="_blank" rel="noopener" href="https://twitter.com/lrnrd">Lena Reinhard</a></li>
<li>译文出自：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner">掘金翻译计划</a></li>
<li>本文永久链接：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/what-we-ve-learned-about-hiring-engineering-managers.md">https://github.com/xitu/gold-miner/blob/master/TODO1/what-we-ve-learned-about-hiring-engineering-managers.md</a></li>
<li>译者：<a target="_blank" rel="noopener" href="https://github.com/JackEggie">JackEggie</a></li>
<li>校对者：<a target="_blank" rel="noopener" href="https://github.com/portandbridge">portandbridge</a>, <a target="_blank" rel="noopener" href="https://github.com/Baddyo">Baddyo</a></li>
</ul>
</blockquote>
<h1 id="我们从招聘技术经理的过程中学到了什么"><a href="#我们从招聘技术经理的过程中学到了什么" class="headerlink" title="我们从招聘技术经理的过程中学到了什么"></a>我们从招聘技术经理的过程中学到了什么</h1><p><img src="https://circleci.com/blog/media/EngineeringManagers.png"></p>
<p>在过去的一年里，我们对于理解负责 CircleCI 的技术经理所需的优秀品质有了重要的转变，并从中了解到我们作为一个组织的需求和价值观。我们大幅改变了招聘流程，通过这些努力，我们聘用了一些出色的人才，使我们技术管理团队的人数翻了一番。现在，我们想和大家分享这些经验。</p>
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<a href="/distributed-transactions-in-spring-with-and-without-xa-part-1/" class="post-title-link" itemprop="url">【译】Spring 的分布式事务实现 — 使用和不使用 XA — 第一部分</a>
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<li>原文地址：<a target="_blank" rel="noopener" href="https://www.javaworld.com/article/2077963/distributed-transactions-in-spring--with-and-without-xa.html">Distributed transactions in Spring, with and without XA - Part I</a></li>
<li>原文作者：<a href="mailto:[email protected]">David Syer</a></li>
<li>译文出自：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner">掘金翻译计划</a></li>
<li>本文永久链接：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/distributed-transactions-in-spring-with-and-without-xa-part-1.md">https://github.com/xitu/gold-miner/blob/master/TODO1/distributed-transactions-in-spring-with-and-without-xa-part-1.md</a></li>
<li>译者：<a target="_blank" rel="noopener" href="https://github.com/JackEggie">JackEggie</a></li>
<li>校对者：<a target="_blank" rel="noopener" href="https://github.com/fireairforce">fireairforce</a></li>
</ul>
</blockquote>
<h1 id="Spring-的分布式事务实现-—-使用和不使用-XA-—-第一部分"><a href="#Spring-的分布式事务实现-—-使用和不使用-XA-—-第一部分" class="headerlink" title="Spring 的分布式事务实现 — 使用和不使用 XA — 第一部分"></a>Spring 的分布式事务实现 — 使用和不使用 XA — 第一部分</h1><blockquote>
<ul>
<li><a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/distributed-transactions-in-spring-with-and-without-xa-part-1.md">Spring 的分布式事务实现 — 使用和不使用 XA — 第一部分</a></li>
<li><a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/distributed-transactions-in-spring-with-and-without-xa-part-2.md">Spring 的分布式事务实现 — 使用和不使用 XA — 第二部分</a></li>
<li><a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/distributed-transactions-in-spring-with-and-without-xa-part-3.md">Spring 的分布式事务实现 — 使用和不使用 XA — 第三部分</a></li>
</ul>
</blockquote>
<blockquote>
<p>Spring 的 7 种事务处理模式</p>
</blockquote>
<p>虽然在 Spring 中分布式事务通常使用 Java Transaction API 和 XA 协议实现，但也有其他的实现方式。最好的实现方式取决于应用程序所使用资源的类型，以及你是否愿意在性能、安全性、可靠性和数据完整性之间做出权衡。针对这个 Java 中的典型问题，Spring 的开发者 David Syer 将会介绍 7 种 Spring 分布式应用的实现方式，其中 3 种实现使用了 XA 协议，另外 4 种使用了其他的实现方式。（中级知识点）</p>
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<h2 id="背景"><a href="#背景" class="headerlink" title="背景"></a>背景</h2><p>从去年开始筹备婚礼之后，自己的情绪就变得逐渐“难以控制”起来。在以前，即使偶尔和父母有矛盾，也仅仅只是不开心，很少有能够影响好几天的情况发生。而现在，一旦因为某些事情不顺心，可以被悲观的情绪影响好多天。被消极的想法支配的感觉真的很不好。</p>
<p>在被悲观情绪支配的情况愈演愈烈之后，我极度想要做出一些改变。</p>
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<a href="/your-first-cli-tool-with-rust/" class="post-title-link" itemprop="url">【译】用 Rust 打造你的第一个命令行工具</a>
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<ul>
<li>原文地址：<a target="_blank" rel="noopener" href="https://www.demainilpleut.fr/your-first-cli-tool-with-rust/">Your first CLI tool with Rust</a></li>
<li>原文作者：<a target="_blank" rel="noopener" href="https://www.demainilpleut.fr/authors/jveillet">Jérémie Veillet</a></li>
<li>译文出自：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner">掘金翻译计划</a></li>
<li>本文永久链接：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/your-first-cli-tool-with-rust.md">https://github.com/xitu/gold-miner/blob/master/TODO1/your-first-cli-tool-with-rust.md</a></li>
<li>译者：<a target="_blank" rel="noopener" href="https://github.com/JackEggie">JackEggie</a></li>
<li>校对者：<a target="_blank" rel="noopener" href="https://github.com/TloveYing">TloveYing</a></li>
</ul>
</blockquote>
<h1 id="用-Rust-打造你的第一个命令行工具"><a href="#用-Rust-打造你的第一个命令行工具" class="headerlink" title="用 Rust 打造你的第一个命令行工具"></a>用 Rust 打造你的第一个命令行工具</h1><p>在精彩的编程世界里，你可能听说过这种名为 Rust 的新语言。它是一种开源的系统级编程语言。它专注于性能、内存安全和并行性。你可以像 C/C++ 那样用它编写底层应用程序。</p>
<p>你可能已经在 <a target="_blank" rel="noopener" href="https://webassembly.org/">Web Assembly</a> 网站上见到过它了。Rust 能够编译 WASM 应用程序，你可以在 <a target="_blank" rel="noopener" href="https://webassembly.org/docs/use-cases/">Web Assembly FAQ</a> 上找到很多例子。它也被认为是 <a target="_blank" rel="noopener" href="https://servo.org/">servo</a> 的基石，servo 是一个在 Firefox 中实现的高性能浏览器引擎。</p>
<p>这可能会让你望而却步，但这不是我们要在这里讨论的内容。我们将介绍如何使用它构建命令行工具，而你可能会从中发现很多有意思的东西。</p>
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<a href="/how-to-build-your-own-neural-network-from-scratch-in-python/" class="post-title-link" itemprop="url">【译】如何用 Python 从零开始构建你自己的神经网络</a>
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<ul>
<li>原文地址：<a target="_blank" rel="noopener" href="https://towardsdatascience.com/how-to-build-your-own-neural-network-from-scratch-in-python-68998a08e4f6">How to build your own Neural Network from scratch in Python</a></li>
<li>原文作者：<a target="_blank" rel="noopener" href="https://towardsdatascience.com/@jamesloyys">James Loy</a></li>
<li>译文出自：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner">掘金翻译计划</a></li>
<li>本文永久链接：<a target="_blank" rel="noopener" href="https://github.com/xitu/gold-miner/blob/master/TODO1/how-to-build-your-own-neural-network-from-scratch-in-python.md">https://github.com/xitu/gold-miner/blob/master/TODO1/how-to-build-your-own-neural-network-from-scratch-in-python.md</a></li>
<li>译者：<a target="_blank" rel="noopener" href="https://github.com/JackEggie">JackEggie</a></li>
<li>校对者：<a target="_blank" rel="noopener" href="https://github.com/lsvih">lsvih</a>, <a target="_blank" rel="noopener" href="https://github.com/xionglong58">xionglong58</a></li>
</ul>
</blockquote>
<h1 id="如何用-Python-从零开始构建你自己的神经网络"><a href="#如何用-Python-从零开始构建你自己的神经网络" class="headerlink" title="如何用 Python 从零开始构建你自己的神经网络"></a>如何用 Python 从零开始构建你自己的神经网络</h1><blockquote>
<p>一个帮助初学者理解深度神经网络内部工作机制的指南</p>
</blockquote>
<p><strong>写作动机：</strong> 为了使我自己可以更好地理解深度学习，我决定在没有像 TensorFlow 这样的深度学习库的情况下，从零开始构建一个神经网络。我相信，理解神经网络的内部工作原理对任何有追求的数据科学家来说都很重要。</p>
<p>这篇文章包含了我所学到的东西，希望对你们也有用。</p>
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<a href="/talk-about-double-locking-problem/" class="post-title-link" itemprop="url">Java 中的双重检查锁(Double-Checked Locking)的问题</a>
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<h3 id="Java-中的双重检查锁"><a href="#Java-中的双重检查锁" class="headerlink" title="Java 中的双重检查锁"></a>Java 中的双重检查锁</h3><p>不知道从什么时候开始，双重锁检机制开始在 Java 程序员中流传开来，并被一些不成熟的程序员所称道。然而，双重锁检机制无论在 Java 的什么年代，都是一个不折不扣的代码陷阱。</p>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// double-checked-locking - don't do this!</span></span><br><span class="line"></span><br><span class="line"><span class="keyword">private</span> <span class="keyword">static</span> <span class="type">Something</span> <span class="variable">instance</span> <span class="operator">=</span> <span class="literal">null</span>;</span><br><span class="line"></span><br><span class="line"><span class="keyword">public</span> Something <span class="title function_">getInstance</span><span class="params">()</span> {</span><br><span class="line"> <span class="keyword">if</span> (instance == <span class="literal">null</span>) {</span><br><span class="line"> <span class="keyword">synchronized</span> (<span class="built_in">this</span>) {</span><br><span class="line"> <span class="keyword">if</span> (instance == <span class="literal">null</span>)</span><br><span class="line"> instance = <span class="keyword">new</span> <span class="title class_">Something</span>();</span><br><span class="line"> }</span><br><span class="line"> }</span><br><span class="line"> <span class="keyword">return</span> instance;</span><br><span class="line">}</span><br></pre></td></tr></table></figure>
<p>这段代码粗看上去使用了很“神奇”的 Java 多线程技巧，“巧妙”利用重复地两次检查对象是否为空来避免了大部分情况下 synchronized 关键字的性能消耗。</p>
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