mirror of https://github.com/vapor/docs.git
1475 lines
36 KiB
HTML
1475 lines
36 KiB
HTML
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Concepts
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Code Contributions
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<div class="md-search-result__meta">
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Type to start searching
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<ol class="md-search-result__list"></ol>
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GitHub
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GitHub
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Overview
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Install
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<a href="../../install/macos/" title="macOS" class="md-nav__link">
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macOS
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</a>
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<a href="../../install/ubuntu/" title="Ubuntu" class="md-nav__link">
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Ubuntu
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Getting started
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Getting started
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Hello, world
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Toolbox
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/spm/" title="SPM" class="md-nav__link">
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SPM
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/xcode/" title="Xcode" class="md-nav__link">
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Xcode
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/structure/" title="Folder Structure" class="md-nav__link">
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Folder Structure
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/application/" title="Application" class="md-nav__link">
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Application
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/controllers/" title="Controllers" class="md-nav__link">
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Controllers
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/routing/" title="Routing" class="md-nav__link">
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Routing
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/content/" title="Content" class="md-nav__link">
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Content
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/futures/" title="Futures" class="md-nav__link">
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Futures
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</a>
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<li class="md-nav__item">
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<a href="../../getting-started/cloud/" title="Deployment" class="md-nav__link">
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Deployment
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</a>
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</ul>
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</nav>
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<li class="md-nav__item md-nav__item--active md-nav__item--nested">
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<input class="md-toggle md-nav__toggle" data-md-toggle="nav-4" type="checkbox" id="nav-4" checked>
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<label class="md-nav__link" for="nav-4">
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Concepts
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</label>
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<nav class="md-nav" data-md-component="collapsible" data-md-level="1">
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<label class="md-nav__title" for="nav-4">
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Concepts
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</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="../vapor/" title="Vapor" class="md-nav__link">
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Vapor
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</a>
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<li class="md-nav__item">
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<a href="../content/" title="Content" class="md-nav__link">
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Content
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</a>
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<li class="md-nav__item">
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<a href="../services/" title="Services" class="md-nav__link">
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Services
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</a>
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<li class="md-nav__item">
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<a href="../http/" title="HTTP" class="md-nav__link">
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HTTP
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</a>
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</li>
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<li class="md-nav__item md-nav__item--active">
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<input class="md-toggle md-nav__toggle" data-md-toggle="toc" type="checkbox" id="toc">
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<label class="md-nav__link md-nav__link--active" for="toc">
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Code Contributions
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</label>
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<a href="./" title="Code Contributions" class="md-nav__link md-nav__link--active">
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Code Contributions
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</a>
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<nav class="md-nav md-nav--secondary">
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<label class="md-nav__title" for="toc">Table of contents</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<li class="md-nav__item">
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<a href="#requirements" title="Requirements" class="md-nav__link">
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Requirements
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</a>
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<nav class="md-nav">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#enums" title="Enums" class="md-nav__link">
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Enums
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#classes" title="Classes" class="md-nav__link">
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Classes
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#low-level-apis" title="Low-level APIs" class="md-nav__link">
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Low-level APIs
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#tests" title="Tests" class="md-nav__link">
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Tests
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#uniformity" title="Uniformity" class="md-nav__link">
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Uniformity
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#binary-data" title="Binary data" class="md-nav__link">
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Binary data
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#dictionaries-and-arrays" title="Dictionaries and Arrays" class="md-nav__link">
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Dictionaries and Arrays
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</a>
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</li>
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</ul>
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</nav>
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</li>
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<li class="md-nav__item">
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<a href="#guidelines" title="Guidelines" class="md-nav__link">
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Guidelines
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</a>
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<nav class="md-nav">
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<ul class="md-nav__list">
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<li class="md-nav__item">
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<a href="#performance" title="Performance" class="md-nav__link">
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Performance
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#access-modifiers" title="Access modifiers" class="md-nav__link">
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Access modifiers
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#comments" title="Comments" class="md-nav__link">
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<a href="#argument-count" title="Argument count" class="md-nav__link">
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Initializer complexity
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<a href="../../redis/pub-sub/" title="Publish and Subscribe" class="md-nav__link">
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Publish and Subscribe
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<a href="../../redis/pipeline/" title="Pipeline" class="md-nav__link">
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Pipeline
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Services
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<a href="../../crypto/getting-started/" title="Package" class="md-nav__link">
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<li class="md-nav__item">
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<a href="../../crypto/base64/" title="Base64" class="md-nav__link">
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<li class="md-nav__item">
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<a href="../../crypto/hash/" title="Hashes" class="md-nav__link">
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Hashes
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<a href="../../crypto/passwords/" title="Password hashing" class="md-nav__link">
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Password hashing
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<a href="../../crypto/random/" title="Random" class="md-nav__link">
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Random
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<a href="../../version/1_5/" title="1.5" class="md-nav__link">
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1.5
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2.0
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3.0-alpha
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<div class="md-sidebar__inner">
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<nav class="md-nav md-nav--secondary">
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<label class="md-nav__title" for="toc">Table of contents</label>
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<ul class="md-nav__list" data-md-scrollfix>
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<a href="#requirements" title="Requirements" class="md-nav__link">
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Requirements
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Enums
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<a href="#low-level-apis" title="Low-level APIs" class="md-nav__link">
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Low-level APIs
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Tests
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<a href="#uniformity" title="Uniformity" class="md-nav__link">
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Uniformity
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<li class="md-nav__item">
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<a href="#binary-data" title="Binary data" class="md-nav__link">
|
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Binary data
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</a>
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<li class="md-nav__item">
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<a href="#dictionaries-and-arrays" title="Dictionaries and Arrays" class="md-nav__link">
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Dictionaries and Arrays
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Guidelines
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Performance
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<a href="#access-modifiers" title="Access modifiers" class="md-nav__link">
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Access modifiers
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<a href="#argument-labels" title="Argument labels" class="md-nav__link">
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Argument labels
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</a>
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</li>
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<li class="md-nav__item">
|
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<a href="#argument-count" title="Argument count" class="md-nav__link">
|
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Argument count
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</a>
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</li>
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<li class="md-nav__item">
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<a href="#initializer-complexity" title="Initializer complexity" class="md-nav__link">
|
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Initializer complexity
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</a>
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</li>
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</ul>
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</nav>
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</ul>
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</div>
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</div>
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<div class="md-content">
|
|
<article class="md-content__inner md-typeset">
|
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|
|
<a href="https://github.com/vapor/documentation/edit/beta/3.0/docs/concepts/code-contributions.md" title="Edit this page" class="md-icon md-content__icon"></a>
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|
|
<h1 id="api-design">API Design<a class="headerlink" href="#api-design" title="Permanent link">¶</a></h1>
|
|
<p>For contributing code we have guidelines that we strive for, and requirements.
|
|
Accepted code <em>must</em> comply to all requirements and <em>should</em> follow all guidelines.</p>
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<h2 id="requirements">Requirements<a class="headerlink" href="#requirements" title="Permanent link">¶</a></h2>
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<p>The requirements stated here <em>must</em> be followed for all Vapor 3 code starting with the beta.
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We designed all of Vapor 3's APIs (including the Async library) to require little to no breaking changes over the coming years.</p>
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<h3 id="enums">Enums<a class="headerlink" href="#enums" title="Permanent link">¶</a></h3>
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<p><code>enum</code>s should only be used where adding a new case should result in a breaking change. Specifically since exhaustively switching on an <code>enum</code> will no longer compile when a new case is added. For things like errors, this is obviously undesirable as supporting a new error type results in code no longer compiling. However, for something like a supported data type, <code>enum</code>s makes sense because the errors help you track down all of places that need support for that new type added. Most use cases for <code>enum</code>s are when the enum is internal to the current module.</p>
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<h3 id="classes">Classes<a class="headerlink" href="#classes" title="Permanent link">¶</a></h3>
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<p>Always mark classes as <code>final</code>. If you plan on using a <code>public</code> class, look into a protocol or generics oriented approach.</p>
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<h3 id="low-level-apis">Low-level APIs<a class="headerlink" href="#low-level-apis" title="Permanent link">¶</a></h3>
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<p>Low level APIs such as sockets, SSL, cryptography and HTTP should be oriented towards simplicity, maintainability and correctness.
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If you feel an API becomes more complex for end-users, you can add high level APIs that rely on the low-level ones.</p>
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<h3 id="tests">Tests<a class="headerlink" href="#tests" title="Permanent link">¶</a></h3>
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<p>The unit tests must have a minimum of 80% code coverage.</p>
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<h3 id="uniformity">Uniformity<a class="headerlink" href="#uniformity" title="Permanent link">¶</a></h3>
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<p>Stick to the familiar API patterns. If connecting a socket has the following signature:</p>
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<div class="codehilite"><pre><span></span><span class="k">try</span> <span class="n">socket</span><span class="p">.</span><span class="n">connect</span><span class="p">(</span><span class="n">to</span><span class="p">:</span> <span class="s">"example.com"</span><span class="p">,</span> <span class="n">port</span><span class="p">:</span> <span class="mi">80</span><span class="p">)</span>
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</pre></div>
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<p>Copy the signature, rather than adding an extra case.
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If you need more metadata for connecting, consider setting them in the initializer or as a variable on the type.</p>
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<h3 id="binary-data">Binary data<a class="headerlink" href="#binary-data" title="Permanent link">¶</a></h3>
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<p>Binary data should be passed around in 3 formats;</p>
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<ul>
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<li>ByteBuffer</li>
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<li>Data</li>
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<li>[UInt8]</li>
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</ul>
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<p>You should use <code>ByteBuffer</code> when working with Streams to limit copies and improve the stream chaining applicability.
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<code>Data</code> for larger sets of data (>1000 bytes) and <code>[UInt8]</code> for smaller data sets (<=1000 bytes).</p>
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<h3 id="dictionaries-and-arrays">Dictionaries and Arrays<a class="headerlink" href="#dictionaries-and-arrays" title="Permanent link">¶</a></h3>
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<p>Where you'd normally use a dictionary (such as HTTP headers) you <em>should</em> create a separate struct instead.
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This improves the freedom for future optimizations and keeps the implementation separate from the end user API.
|
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This results in better future-proofing and helps building better (more specialized) APIs.</p>
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<h2 id="guidelines">Guidelines<a class="headerlink" href="#guidelines" title="Permanent link">¶</a></h2>
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<h3 id="performance">Performance<a class="headerlink" href="#performance" title="Permanent link">¶</a></h3>
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<p>Performance regression is acceptable to some degree but should be limited.
|
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Here are some tips on achieving high performance code or ensuring more performance can be added in the future.</p>
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<h3 id="access-modifiers">Access modifiers<a class="headerlink" href="#access-modifiers" title="Permanent link">¶</a></h3>
|
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<p>Try to use the <code>public</code> keyword as little as possible. More APIs adds more complexity than freedom.
|
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Specialized use cases are always free to build their own modules, and a <code>public</code> keyword can be added but not undone.</p>
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<h3 id="comments">Comments<a class="headerlink" href="#comments" title="Permanent link">¶</a></h3>
|
|
<p>Green is the future, and we believe in that, too! I'm not talking about green energy, but the often green coloured code comments.
|
|
Code comments important for the users of an API. Do not add meaningless comments, though.</p>
|
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<h3 id="documentation">Documentation<a class="headerlink" href="#documentation" title="Permanent link">¶</a></h3>
|
|
<p>Every <code>public</code> function, type and variable <em>should</em> have a link to the documentation describing it's use case(s) with examples.</p>
|
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<h3 id="argument-labels">Argument labels<a class="headerlink" href="#argument-labels" title="Permanent link">¶</a></h3>
|
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<p>Along with uniformity described above, you should try to keep argument labels short and descriptive.</p>
|
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<h3 id="argument-count">Argument count<a class="headerlink" href="#argument-count" title="Permanent link">¶</a></h3>
|
|
<p>We strive for functions with a maximum of 3 parameters, although certain use cases permit for more arguments.
|
|
Often called functions should strive for less arguments.</p>
|
|
<h3 id="initializer-complexity">Initializer complexity<a class="headerlink" href="#initializer-complexity" title="Permanent link">¶</a></h3>
|
|
<p>Initializers are complex enough, it is recommended to <em>not</em> put optional arguments in an initializer since they can be modified on the entity itself.
|
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Try to limit the initializer to what really matters, and put the rest in <code>func</code>tions.</p>
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