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02-components.html
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<!DOCTYPE html><html lang="zh-CN"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width,height=device-height,initial-scale=1.0"><meta name="apple-mobile-web-app-capable" content="yes"><meta http-equiv="X-UA-Compatible" content="ie=edge"><meta property="og:type" content="website"><meta name="twitter:card" content="summary"><style>.bespoke-marp-note,.bespoke-marp-osc,.bespoke-progress-parent{display:none;transition:none}@media screen{body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{-webkit-appearance:none;-moz-appearance:none;appearance:none;background-color:transparent;border:0;color:inherit;cursor:pointer;font-size:inherit;opacity:.8;outline:none;padding:0;transition:opacity .2s linear;-webkit-tap-highlight-color:transparent}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:disabled,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:disabled{cursor:not-allowed;opacity:.15!important}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover{opacity:1}body[data-bespoke-view=""] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:active,body[data-bespoke-view=next] .bespoke-marp-parent>.bespoke-marp-osc>button:hover:active,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button:hover:active{opacity:.6}body[data-bespoke-view=""] 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data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("images/architecture.svg");background-size:80%;"></figure></div></section></foreignObject><foreignObject width="70%" height="720"><section id="1" data-background-color="#fff" data-background-image="url('https://marp.app/assets/hero-background.jpg')" data-class="lead" data-theme="gaia" class="lead" style="--background-color:#fff;--background-image:url('https://marp.app/assets/hero-background.jpg');--class:lead;--theme:gaia;background-color:#fff;background-image:url('https://marp.app/assets/hero-background.jpg');background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:30%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>Software Architecture</h1>
<h2>Components and Spring IoC</h2>
</section>
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<h1>Software Architecture</h1>
<blockquote>
<p>Architecture is a subjective thing, a shared understanding of a system’s design by the expert developers on a project. Commonly this shared understanding is in the form of the <strong>major components of the system and how they interact</strong>. It’s also about decisions, in that it’s the decisions that developers wish they could get right early on because they’re perceived as hard to change.</p>
</blockquote>
<br />
<div style="text-align: right;">-- Martin Fowler, 2003</div>
</section>
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<h1>Components-based</h1>
<p>软件工程强调软件开发过程应该采用工程化开发方法和工业化生产技术，<strong>从传统工业借鉴方法和技术</strong>是一种有效手段</p>
<ul>
<li>基于标准化构件的生产技术
<ul>
<li>汽车生产：汽车零件</li>
<li>建筑工程：建筑材料</li>
</ul>
</li>
<li>第三方提供 vs. 自身积累
<ul>
<li>汽车轮胎 、变速箱总成</li>
</ul>
</li>
</ul>
</section>
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<h1>Software Component</h1>
<br />
<blockquote>
<p>A software component is <strong>a unit of composition</strong> with <strong>contractually specified interfaces</strong> and <strong>explicit context dependencies</strong> only. A software component can be <strong>deployed independently</strong> and is subject to composition by third parties.</p>
</blockquote>
<br />
<div style="text-align: right;">-- Clemens Szyperski</div>
</section>
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<h1>类比：装机</h1>
<ul>
<li>A unit of composition</li>
<li>Contractually specified interfaces</li>
<li>Explicit context dependencies</li>
<li>Composition by third parties</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:45%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("images/02-cbse.png");background-size:contain;"></figure></div></section></foreignObject><foreignObject width="55%" height="720"><section id="6" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:45%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>CBSE</h1>
<p>Component-based software engineering (CBSE), i.e. components-based development (CBD), is ... <strong>a reuse-based approach to defining, implementing and composing loosely coupled independent components into systems</strong>.</p>
</section>
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<h1>Goals of CBD</h1>
<ul>
<li>Assemble a system out of existing (third-party) components</li>
<li>Update a system by adding / replacing components, which are
<ul>
<li>units of deployment</li>
<li>are handled as they are (blackboxes)</li>
</ul>
</li>
</ul>
</section>
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<h1>CCM Component</h1>
<p><img src="images/02-ccm.png" alt="height:500px" style="height:500px;" /></p>
</section>
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<h1>Component Composition</h1>
<p><img src="images/02-composition.png" alt="height:500px" style="height:500px;" /></p>
</section>
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<h1>Spring</h1>
<p>The Spring framework is a modular framework that offers a large set of "tools" to support the developer in writing modern component-based applications.</p>
<p><a href="https://spring.io/projects/spring-framework">https://spring.io/projects/spring-framework</a></p>
</section>
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<h1>CBD a web app with Spring</h1>
<p><a href="https://www.bilibili.com/video/BV1A7411F7Jh?p=3">https://www.bilibili.com/video/BV1A7411F7Jh?p=3</a> (5:30)</p>
<p><img src="images/02-bootstrap.png" alt="height:300px" style="height:300px;" /></p>
<br />
<div style="text-align: right;">sa-spring/spring-bootstrap</div>
</section>
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<h1>Compositing/Assembling/Wiring</h1>
<p><img src="images/02-bootstrap-components.png" alt="height:500px" style="height:500px;" /></p>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>控制反转 IoC</h1>
<p>提供服务的组件是被“注入”的而不是被“直接写入”到请求者的代码中</p>
<p><img src="images/02-moviefinder.png" alt="height:270px" style="height:270px;" /></p>
<br />
<div style="text-align: right;"><small>https://martinfowler.com/articles/injection.html</small></div>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("images/02-moviefinderimp.png");background-size:90%;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="14" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>Solution Design</h1>
<br />
<p><img src="images/02-imoviefinder.png" alt="height:100px" style="height:100px;" /></p>
<br />
<ul>
<li><code>MovieFinder</code> is an interface</li>
</ul>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="background" data-marpit-advanced-background-split="right"><div data-marpit-advanced-background-container="true" data-marpit-advanced-background-direction="horizontal"><figure style="background-image:url("images/02-bad-design.png");background-size:80%;"></figure></div></section></foreignObject><foreignObject width="50%" height="720"><section id="15" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;--marpit-advanced-background-split:50%;" data-marpit-advanced-background="content" data-marpit-advanced-background-split="right">
<h1>Bad Design</h1>
<p><img src="images/02-bad-imp.png" alt="height:390px" style="height:390px;" /><br />
</p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>Goal: loosely coupled components</h1>
<ul>
<li><code>MovieLister</code> should work with <strong>any</strong> <code>MovieFinderImplementation</code>
<ul>
<li><small><code>MovieLister</code> does not need to know the particular type of finder implementation it is using</small></li>
</ul>
</li>
<li>The good solution: eliminate all lines of code such as:
<ul>
<li><small><code>MovieFinder f = new MyParticularMovieFinderImpl();</code></small></li>
<li><small>A component should NEVER create (instantiate) its dependencies</small></li>
</ul>
</li>
<li>The solution is called <strong>“Inversion of Control”</strong>
<ul>
<li><small>A component does not create (instantiate) its dependencies but has someone else creating them for it</small></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>Concept of “Inversion of Control”</h1>
<p>In the context of components: the application independently defines a set of components and their dependencies and the component framework (called container) uses this information to</p>
<ul>
<li>Wire the components together at run-time</li>
<li>Call its code at specific times in the life cycle</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>Inversion of Control</h1>
<p>Inversion of Control can be achieved through several patterns:</p>
<ul>
<li>Dependency Injection</li>
<li>Service Locator （<a href="https://martinfowler.com/articles/injection.html#UsingAServiceLocator%EF%BC%89">https://martinfowler.com/articles/injection.html#UsingAServiceLocator）</a></li>
</ul>
</section>
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<h1>Dependency Injection</h1>
<p><img src="images/02-dependency-injection.png" alt="height:350px" style="height:350px;" /></p>
<div style="text-align: center;">An Assembler instantiates concrete implementations and “injects” them into the component that needs them.</div>
</section>
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<h1>Forms of Dependency Injection</h1>
<ul>
<li>Constructor Injection
<ul>
<li><small><code>MovieLister</code> has a constructor that will get the <code>MovieFinderImplementation</code></li>
</ul>
</li>
<li>Setter Injection</small>
<ul>
<li><small><code>MovieLister</code> has a setter method that will get the <code>MovieFinderImplementation</code></li>
</ul>
</li>
<li>Interface Injection</small>
<ul>
<li><small>An interface <code>InjectFinder</code>, with method <code>injectFinder</code>, defined by the provider of the <code>MovieFinder</code> interface</small></li>
<li><small><code>MovieLister</code> (and any class that wants to use a <code>MovieFinder</code>) needs to implement this interface </small></li>
</ul>
</li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>Component Containers</h1>
<p>What has the DI pattern to do with component frameworks ?</p>
<ul>
<li>The <code>Assembler</code> component of the DI pattern is called a <strong>Component Container</strong> and is part of the component framework</li>
<li>The assembler (Container) is generic (for any application), thus it:
<ul>
<li><small>Requires that components follow a certain convention (constructor, setter, injector interfaces)</small></li>
<li><small>Requires to be told (by code or configuration files) which implementation to associate with which interface</small></li>
</ul>
</li>
</ul>
</section>
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<h1>Example: Setter Injection with Spring</h1>
<ol>
<li>Defining setters</li>
</ol>
<p><img src="images/02-setter.png" alt="height:400px" style="height:400px;" /></p>
</section>
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<h1>Example: Setter Injection with Spring</h1>
<ol start="2">
<li>Describing the configuration(spring.xml)</li>
</ol>
<p><img src="images/02-spring-xml.png" alt="height:300px" style="height:300px;" /></p>
<p><small>bean与component都是Spring管理的软件构件，我们在demo中看到的controller是一种特殊的component。</small></p>
</section>
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<h1>Example: Setter Injection with Spring</h1>
<ol start="3">
<li>Start the container</li>
</ol>
<p><img src="images/02-start-context.png" alt="height:170px" style="height:170px;" /><br />
</p>
<div style="text-align: right;">sa-spring/spring-bean</div>
<p><small><small><a href="https://www.bilibili.com/video/BV1A7411F7Jh?p=5">https://www.bilibili.com/video/BV1A7411F7Jh?p=5</a></small></small></p>
</section>
</foreignObject><foreignObject width="1280" height="720" data-marpit-advanced-background="pseudo"><section style="" data-marpit-advanced-background="pseudo"></section></foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="25" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>相关阅读</h1>
<p>Spring Core Technologies/ The IoC Container</p>
<ul>
<li><a href="https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/core.html">https://docs.spring.io/spring-framework/docs/current/spring-framework-reference/core.html</a></li>
</ul>
<p>Spring 教程</p>
<ul>
<li><a href="https://wiki.jikexueyuan.com/project/spring/overview.html">https://wiki.jikexueyuan.com/project/spring/overview.html</a></li>
</ul>
</section>
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="26" data-background-color="#fff" data-background-image="none" data-theme="gaia" style="--background-color:#fff;--background-image:none;--theme:gaia;background-color:#fff;background-image:none;background-position:center;background-repeat:no-repeat;background-size:cover;">
<h1>小结</h1>
<ul>
<li>软件构件与构件化开发</li>
<li>Spring构件化开发演示</li>
<li>构件框架核心：反转控制/依赖注入</li>
<li>Spring bean/component</li>
</ul>
</section>
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/*! *****************************************************************************
Copyright (c) Microsoft Corporation.
Permission to use, copy, modify, and/or distribute this software for any
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH
REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
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PERFORMANCE OF THIS SOFTWARE.
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