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426 lines
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426 lines
131 KiB
HTML
<!DOCTYPE html><html lang="en-US"><head><title>N. MVP Pattern and Repositories</title><meta property="og:title" content="N. MVP Pattern and Repositories"><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>@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,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container button{-webkit-tap-highlight-color:transparent;-webkit-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}body[data-bespoke-view=""] 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.bespoke-marp-note.active{display:block}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container .bespoke-marp-note p:first-child{margin-top:0}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-note-container .bespoke-marp-note p:last-child{margin-bottom:0}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container{align-items:center;box-sizing:border-box;color:#eee;display:flex;flex-wrap:nowrap;grid-area:info;justify-content:center;overflow:hidden;padding:0 10px}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-page,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-time,body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-timer{box-sizing:border-box;display:block;padding:0 10px;white-space:nowrap;width:100%}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container button{height:1.5em;line-height:1.5em;width:1.5em}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-page{order:2;text-align:center}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-page .bespoke-marp-presenter-info-page-text{display:inline-block;min-width:120px;text-align:center}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-time{color:#999;order:1;text-align:left}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-timer{color:#999;order:3;text-align:right}body[data-bespoke-view=presenter] .bespoke-marp-presenter-container .bespoke-marp-presenter-info-container .bespoke-marp-presenter-info-timer:hover{cursor:pointer}}@media print{.bespoke-marp-presenter-info-container,.bespoke-marp-presenter-next-container,.bespoke-marp-presenter-note-container{display:none}}</style><style>div#\:\$p>svg>foreignObject>section{width:1280px;height:720px;box-sizing:border-box;overflow:hidden;position:relative;scroll-snap-align:center center}div#\:\$p>svg>foreignObject>section:after{bottom:0;content:attr(data-marpit-pagination);padding:inherit;pointer-events:none;position:absolute;right:0}div#\:\$p>svg>foreignObject>section:not([data-marpit-pagination]):after{display:none}/* Normalization */div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){font-size:2em;margin:0.67em 0}div#\:\$p>svg>foreignObject>section video::-webkit-media-controls{will-change:transform}@page{size:1280px 720px;margin:0}@media print{body,html{background-color:#fff;margin:0;page-break-inside:avoid;break-inside:avoid-page}div#\:\$p>svg>foreignObject>section{page-break-before:always;break-before:page}div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section *{-webkit-print-color-adjust:exact!important;animation-delay:0s!important;animation-duration:0s!important;color-adjust:exact!important;transition:none!important}div#\:\$p>svg[data-marpit-svg]{display:block;height:100vh;width:100vw}}
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/*!
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* Marp default theme.
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*
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* @theme default
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* @author Yuki Hattori
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*
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* @auto-scaling true
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* @size 16:9 1280px 720px
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* @size 4:3 960px 720px
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*/div#\:\$p>svg>foreignObject>section,div#\:\$p>svg>foreignObject>section [data-theme=light]{--color-prettylights-syntax-comment:#6e7781;--color-prettylights-syntax-constant:#0550ae;--color-prettylights-syntax-entity:#6639ba;--color-prettylights-syntax-storage-modifier-import:#24292f;--color-prettylights-syntax-entity-tag:#116329;--color-prettylights-syntax-keyword:#cf222e;--color-prettylights-syntax-string:#0a3069;--color-prettylights-syntax-variable:#953800;--color-prettylights-syntax-brackethighlighter-unmatched:#82071e;--color-prettylights-syntax-invalid-illegal-text:#f6f8fa;--color-prettylights-syntax-invalid-illegal-bg:#82071e;--color-prettylights-syntax-carriage-return-text:#f6f8fa;--color-prettylights-syntax-carriage-return-bg:#cf222e;--color-prettylights-syntax-string-regexp:#116329;--color-prettylights-syntax-markup-list:#3b2300;--color-prettylights-syntax-markup-heading:#0550ae;--color-prettylights-syntax-markup-italic:#24292f;--color-prettylights-syntax-markup-bold:#24292f;--color-prettylights-syntax-markup-deleted-text:#82071e;--color-prettylights-syntax-markup-deleted-bg:#ffebe9;--color-prettylights-syntax-markup-inserted-text:#116329;--color-prettylights-syntax-markup-inserted-bg:#dafbe1;--color-prettylights-syntax-markup-changed-text:#953800;--color-prettylights-syntax-markup-changed-bg:#ffd8b5;--color-prettylights-syntax-markup-ignored-text:#eaeef2;--color-prettylights-syntax-markup-ignored-bg:#0550ae;--color-prettylights-syntax-meta-diff-range:#8250df;--color-prettylights-syntax-brackethighlighter-angle:#57606a;--color-prettylights-syntax-sublimelinter-gutter-mark:#8c959f;--color-prettylights-syntax-constant-other-reference-link:#0a3069;--color-fg-default:#1f2328;--color-fg-muted:#656d76;--color-fg-subtle:#6e7781;--color-canvas-default:#fff;--color-canvas-subtle:#f6f8fa;--color-border-default:#d0d7de;--color-border-muted:#d8dee4;--color-neutral-muted:rgba(175,184,193,.2);--color-accent-fg:#0969da;--color-accent-emphasis:#0969da;--color-attention-subtle:#fff8c5;--color-danger-fg:#d1242f;color-scheme:light}div#\:\$p>svg>foreignObject>section [data-theme=dark],div#\:\$p>svg>foreignObject>section:where(.invert){--color-prettylights-syntax-comment:#8b949e;--color-prettylights-syntax-constant:#79c0ff;--color-prettylights-syntax-entity:#d2a8ff;--color-prettylights-syntax-storage-modifier-import:#c9d1d9;--color-prettylights-syntax-entity-tag:#7ee787;--color-prettylights-syntax-keyword:#ff7b72;--color-prettylights-syntax-string:#a5d6ff;--color-prettylights-syntax-variable:#ffa657;--color-prettylights-syntax-brackethighlighter-unmatched:#f85149;--color-prettylights-syntax-invalid-illegal-text:#f0f6fc;--color-prettylights-syntax-invalid-illegal-bg:#8e1519;--color-prettylights-syntax-carriage-return-text:#f0f6fc;--color-prettylights-syntax-carriage-return-bg:#b62324;--color-prettylights-syntax-string-regexp:#7ee787;--color-prettylights-syntax-markup-list:#f2cc60;--color-prettylights-syntax-markup-heading:#1f6feb;--color-prettylights-syntax-markup-italic:#c9d1d9;--color-prettylights-syntax-markup-bold:#c9d1d9;--color-prettylights-syntax-markup-deleted-text:#ffdcd7;--color-prettylights-syntax-markup-deleted-bg:#67060c;--color-prettylights-syntax-markup-inserted-text:#aff5b4;--color-prettylights-syntax-markup-inserted-bg:#033a16;--color-prettylights-syntax-markup-changed-text:#ffdfb6;--color-prettylights-syntax-markup-changed-bg:#5a1e02;--color-prettylights-syntax-markup-ignored-text:#c9d1d9;--color-prettylights-syntax-markup-ignored-bg:#1158c7;--color-prettylights-syntax-meta-diff-range:#d2a8ff;--color-prettylights-syntax-brackethighlighter-angle:#8b949e;--color-prettylights-syntax-sublimelinter-gutter-mark:#484f58;--color-prettylights-syntax-constant-other-reference-link:#a5d6ff;--color-fg-default:#e6edf3;--color-fg-muted:#7d8590;--color-fg-subtle:#6e7681;--color-canvas-default:#0d1117;--color-canvas-subtle:#161b22;--color-border-default:#30363d;--color-border-muted:#21262d;--color-neutral-muted:hsla(215,8%,47%,.4);--color-accent-fg:#2f81f7;--color-accent-emphasis:#1f6feb;--color-attention-subtle:rgba(187,128,9,.15);--color-danger-fg:#f85149;color-scheme:dark}div#\:\$p>svg>foreignObject>section{-ms-text-size-adjust:100%;-webkit-text-size-adjust:100%;word-wrap:break-word;background-color:var(--color-canvas-default);color:var(--color-fg-default);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Noto Sans,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji;font-size:16px;line-height:1.5;margin:0}div#\:\$p>svg>foreignObject>section{--marpit-root-font-size:16px}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h2,marp-h2):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h3,marp-h3):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h4,marp-h4):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h5,marp-h5):hover .anchor .octicon-link:before,div#\:\$p>svg>foreignObject>section :is(h6,marp-h6):hover .anchor .octicon-link:before{background-color:currentColor;content:" ";display:inline-block;height:16px;-webkit-mask-image:url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 0 0 1.06 1.06l1.25-1.25a2 2 0 1 1 2.83 2.83l-2.5 2.5a2 2 0 0 1-2.83 0 .75.75 0 0 0-1.06 1.06 3.5 3.5 0 0 0 4.95 0l2.5-2.5a3.5 3.5 0 0 0-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 0 1 0-2.83l2.5-2.5a2 2 0 0 1 2.83 0 .75.75 0 0 0 1.06-1.06 3.5 3.5 0 0 0-4.95 0l-2.5 2.5a3.5 3.5 0 0 0 4.95 4.95l1.25-1.25a.75.75 0 0 0-1.06-1.06l-1.25 1.25a2 2 0 0 1-2.83 0z"/></svg>');mask-image:url('data:image/svg+xml;charset=utf-8,<svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" viewBox="0 0 16 16"><path fill-rule="evenodd" d="M7.775 3.275a.75.75 0 0 0 1.06 1.06l1.25-1.25a2 2 0 1 1 2.83 2.83l-2.5 2.5a2 2 0 0 1-2.83 0 .75.75 0 0 0-1.06 1.06 3.5 3.5 0 0 0 4.95 0l2.5-2.5a3.5 3.5 0 0 0-4.95-4.95l-1.25 1.25zm-4.69 9.64a2 2 0 0 1 0-2.83l2.5-2.5a2 2 0 0 1 2.83 0 .75.75 0 0 0 1.06-1.06 3.5 3.5 0 0 0-4.95 0l-2.5 2.5a3.5 3.5 0 0 0 4.95 4.95l1.25-1.25a.75.75 0 0 0-1.06-1.06l-1.25 1.25a2 2 0 0 1-2.83 0z"/></svg>');width:16px}div#\:\$p>svg>foreignObject>section details,div#\:\$p>svg>foreignObject>section figcaption,div#\:\$p>svg>foreignObject>section figure{display:block}div#\:\$p>svg>foreignObject>section summary{display:list-item}div#\:\$p>svg>foreignObject>section [hidden]{display:none!important}div#\:\$p>svg>foreignObject>section a{background-color:transparent;color:var(--color-accent-fg);text-decoration:none}div#\:\$p>svg>foreignObject>section abbr[title]{border-bottom:none;-webkit-text-decoration:underline dotted;text-decoration:underline dotted}div#\:\$p>svg>foreignObject>section b,div#\:\$p>svg>foreignObject>section strong{font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section dfn{font-style:italic}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1){border-bottom:1px solid var(--color-border-muted);font-size:2em;font-weight:var(--base-text-weight-semibold,600);margin:.67em 0;padding-bottom:.3em}div#\:\$p>svg>foreignObject>section mark{background-color:var(--color-attention-subtle);color:var(--color-fg-default)}div#\:\$p>svg>foreignObject>section small{font-size:90%}div#\:\$p>svg>foreignObject>section sub,div#\:\$p>svg>foreignObject>section sup{font-size:75%;line-height:0;position:relative;vertical-align:baseline}div#\:\$p>svg>foreignObject>section sub{bottom:-.25em}div#\:\$p>svg>foreignObject>section sup{top:-.5em}div#\:\$p>svg>foreignObject>section img{background-color:var(--color-canvas-default);border-style:none;box-sizing:content-box;max-width:100%}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre),div#\:\$p>svg>foreignObject>section code,div#\:\$p>svg>foreignObject>section kbd,div#\:\$p>svg>foreignObject>section samp{font-family:monospace;font-size:1em}div#\:\$p>svg>foreignObject>section figure{margin:1em 40px}div#\:\$p>svg>foreignObject>section hr{background:transparent;background-color:var(--color-border-default);border:0;box-sizing:content-box;height:.25em;margin:24px 0;overflow:hidden;padding:0}div#\:\$p>svg>foreignObject>section input{font:inherit;font-family:inherit;font-size:inherit;line-height:inherit;margin:0;overflow:visible}div#\:\$p>svg>foreignObject>section [type=button],div#\:\$p>svg>foreignObject>section [type=reset],div#\:\$p>svg>foreignObject>section [type=submit]{-webkit-appearance:button}div#\:\$p>svg>foreignObject>section [type=checkbox],div#\:\$p>svg>foreignObject>section [type=radio]{box-sizing:border-box;padding:0}div#\:\$p>svg>foreignObject>section [type=number]::-webkit-inner-spin-button,div#\:\$p>svg>foreignObject>section [type=number]::-webkit-outer-spin-button{height:auto}div#\:\$p>svg>foreignObject>section [type=search]::-webkit-search-cancel-button,div#\:\$p>svg>foreignObject>section [type=search]::-webkit-search-decoration{-webkit-appearance:none}div#\:\$p>svg>foreignObject>section ::-webkit-input-placeholder{color:inherit;opacity:.54}div#\:\$p>svg>foreignObject>section ::-webkit-file-upload-button{-webkit-appearance:button;font:inherit}div#\:\$p>svg>foreignObject>section a:hover{text-decoration:underline}div#\:\$p>svg>foreignObject>section ::-moz-placeholder{color:var(--color-fg-subtle);opacity:1}div#\:\$p>svg>foreignObject>section ::placeholder{color:var(--color-fg-subtle);opacity:1}div#\:\$p>svg>foreignObject>section hr:after,div#\:\$p>svg>foreignObject>section hr:before{content:"";display:table}div#\:\$p>svg>foreignObject>section hr:after{clear:both}div#\:\$p>svg>foreignObject>section table{border-collapse:collapse;border-spacing:0;display:block;max-width:100%;overflow:auto;width:-moz-max-content;width:max-content}div#\:\$p>svg>foreignObject>section td,div#\:\$p>svg>foreignObject>section th{padding:0}div#\:\$p>svg>foreignObject>section details summary{cursor:pointer}div#\:\$p>svg>foreignObject>section details:not([open])>:not(summary){display:none!important}div#\:\$p>svg>foreignObject>section [role=button]:focus,div#\:\$p>svg>foreignObject>section a:focus,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus,div#\:\$p>svg>foreignObject>section input[type=radio]:focus{box-shadow:none;outline:2px solid var(--color-accent-fg);outline-offset:-2px}div#\:\$p>svg>foreignObject>section [role=button]:focus:not(:focus-visible),div#\:\$p>svg>foreignObject>section a:focus:not(:focus-visible),div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus:not(:focus-visible),div#\:\$p>svg>foreignObject>section input[type=radio]:focus:not(:focus-visible){outline:1px solid transparent}div#\:\$p>svg>foreignObject>section [role=button]:focus-visible,div#\:\$p>svg>foreignObject>section a:focus-visible,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus-visible,div#\:\$p>svg>foreignObject>section input[type=radio]:focus-visible{box-shadow:none;outline:2px solid var(--color-accent-fg);outline-offset:-2px}div#\:\$p>svg>foreignObject>section a:not([class]):focus,div#\:\$p>svg>foreignObject>section a:not([class]):focus-visible,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus,div#\:\$p>svg>foreignObject>section input[type=checkbox]:focus-visible,div#\:\$p>svg>foreignObject>section input[type=radio]:focus,div#\:\$p>svg>foreignObject>section input[type=radio]:focus-visible{outline-offset:0}div#\:\$p>svg>foreignObject>section kbd{background-color:var(--color-canvas-subtle);border-bottom-color:var(--color-neutral-muted);border:1px solid var(--color-neutral-muted);border-radius:6px;box-shadow:inset 0 -1px 0 var(--color-neutral-muted);color:var(--color-fg-default);display:inline-block;font:11px ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace;line-height:10px;padding:3px 5px;vertical-align:middle}div#\:\$p>svg>foreignObject>section :is(h1,marp-h1),div#\:\$p>svg>foreignObject>section :is(h2,marp-h2),div#\:\$p>svg>foreignObject>section :is(h3,marp-h3),div#\:\$p>svg>foreignObject>section :is(h4,marp-h4),div#\:\$p>svg>foreignObject>section :is(h5,marp-h5),div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){font-weight:var(--base-text-weight-semibold,600);line-height:1.25;margin-bottom:16px;margin-top:24px}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2){border-bottom:1px solid var(--color-border-muted);font-size:1.5em;padding-bottom:.3em}div#\:\$p>svg>foreignObject>section :is(h2,marp-h2),div#\:\$p>svg>foreignObject>section :is(h3,marp-h3){font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section :is(h3,marp-h3){font-size:1.25em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4){font-size:1em}div#\:\$p>svg>foreignObject>section :is(h4,marp-h4),div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section :is(h5,marp-h5){font-size:.875em}div#\:\$p>svg>foreignObject>section :is(h6,marp-h6){color:var(--color-fg-muted);font-size:.85em;font-weight:var(--base-text-weight-semibold,600)}div#\:\$p>svg>foreignObject>section p{margin-bottom:10px;margin-top:0}div#\:\$p>svg>foreignObject>section blockquote{border-left:.25em solid var(--color-border-default);color:var(--color-fg-muted);margin:0;padding:0 1em}div#\:\$p>svg>foreignObject>section ol,div#\:\$p>svg>foreignObject>section ul{margin-bottom:0;margin-top:0;padding-left:2em}div#\:\$p>svg>foreignObject>section ol ol,div#\:\$p>svg>foreignObject>section ul ol{list-style-type:lower-roman}div#\:\$p>svg>foreignObject>section ol ol ol,div#\:\$p>svg>foreignObject>section ol ul ol,div#\:\$p>svg>foreignObject>section ul ol ol,div#\:\$p>svg>foreignObject>section ul ul ol{list-style-type:lower-alpha}div#\:\$p>svg>foreignObject>section dd{margin-left:0}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre),div#\:\$p>svg>foreignObject>section code,div#\:\$p>svg>foreignObject>section samp,div#\:\$p>svg>foreignObject>section tt{font-family:ui-monospace,SFMono-Regular,SF Mono,Menlo,Consolas,Liberation Mono,monospace;font-size:12px}div#\:\$p>svg>foreignObject>section :is(pre,marp-pre){word-wrap:normal;margin-bottom:0;margin-top:0}div#\:\$p>svg>foreignObject>section .octicon{fill:currentColor;display:inline-block;overflow:visible!important;vertical-align:text-bottom}div#\:\$p>svg>foreignObject>section input::-webkit-inner-spin-button,div#\:\$p>svg>foreignObject>section input::-webkit-outer-spin-button{-webkit-appearance:none;appearance:none;margin:0}div#\:\$p>svg>foreignObject>section:after,div#\:\$p>svg>foreignObject>section:before{
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/* buutti.css */
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/* @theme buutti */div#\:\$p>svg>foreignObject>section .columns{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns12{display:grid;grid-template-columns:1fr 2fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns21{display:grid;grid-template-columns:2fr 1fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns32{display:grid;grid-template-columns:3fr 2fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns23{display:grid;grid-template-columns:2fr 3fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .columns111{display:grid;grid-template-columns:1fr 1fr 1fr;gap:calc(var(--marpit-root-font-size, 1rem) * 1)}div#\:\$p>svg>foreignObject>section .centered{display:flex;flex-direction:column;justify-content:center;text-align:center}div#\:\$p>svg>foreignObject>section .tableborderless td,div#\:\$p>svg>foreignObject>section th{border:none!important;border-collapse:collapse}div#\:\$p>svg>foreignObject>section.extra{background-color:#5d275d;background-image:linear-gradient(to bottom,#401a40,#1d0c1d);color:white}div#\:\$p>svg>foreignObject>section.extra a{color:rgb(145,255,209)}div#\:\$p>svg>foreignObject>section.exercise{background-color:#29366f;background-image:linear-gradient(to bottom,#20636a,#173742);color:white}div#\:\$p>svg>foreignObject>section.exercise a{color:rgb(211,173,255)}
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/* @theme gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs */div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]{columns:initial!important;display:block!important;padding:0!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]:after,div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]:before,div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content]:after,div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content]:before{display:none!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]{all:initial;display:flex;flex-direction:row;height:100%;overflow:hidden;width:100%}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container][data-marpit-advanced-background-direction=vertical]{flex-direction:column}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split]>div[data-marpit-advanced-background-container]{width:var(--marpit-advanced-background-split,50%)}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background][data-marpit-advanced-background-split=right]>div[data-marpit-advanced-background-container]{margin-left:calc(100% - var(--marpit-advanced-background-split, 50%))}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure{all:initial;background-position:center;background-repeat:no-repeat;background-size:cover;flex:auto;margin:0}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=background]>div[data-marpit-advanced-background-container]>figure>figcaption{position:absolute;border:0;clip:rect(0,0,0,0);height:1px;margin:-1px;overflow:hidden;padding:0;white-space:nowrap;width:1px}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=content],div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=pseudo]{background:transparent!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background=pseudo],div#\:\$p>svg[data-marpit-svg]>foreignObject[data-marpit-advanced-background=pseudo]{pointer-events:none!important}div#\:\$p>svg>foreignObject>section[data-marpit-advanced-background-split]{width:100%;height:100%}</style></head><body><div class="bespoke-marp-osc"><button data-bespoke-marp-osc="prev" tabindex="-1" title="Previous slide">Previous slide</button><span data-bespoke-marp-osc="page"></span><button data-bespoke-marp-osc="next" tabindex="-1" title="Next slide">Next slide</button><button data-bespoke-marp-osc="fullscreen" tabindex="-1" title="Toggle fullscreen (f)">Toggle fullscreen</button><button data-bespoke-marp-osc="presenter" tabindex="-1" title="Open presenter view (p)">Open presenter view</button></div><div id=":$p"><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="1" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="1" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
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<h1 id="mvp-pattern-and-repositories">MVP Pattern and Repositories</h1>
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</section>
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</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="2" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="2" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
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<h2 id="the-mvc-pattern">The MVC Pattern</h2>
|
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<ul>
|
|
<li data-marpit-fragment="1">For creating APIs, we now know how to
|
|
<ul>
|
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<li data-marpit-fragment="2">set up an ASP.NET Core web application,</li>
|
|
<li data-marpit-fragment="3">set up routes with attributes to connect request URIs with methods,</li>
|
|
<li data-marpit-fragment="4">respond with HTTP responses</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="5">The problem is that all this functionality is scattered here and there around the program, meaning we have no structure to what we are doing</li>
|
|
<li data-marpit-fragment="6">In order to write production level code with ASP.NET, your API should follow the <em><strong>MVC pattern</strong></em></li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="3" data-marpit-fragments="8" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="3" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="what-is-the-mvc-pattern">What is the MVC Pattern?</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1"><a href="https://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller">MVC</a> is a software architectural pattern, an acronym for Model - View - Controller</li>
|
|
<li data-marpit-fragment="2">Traditionally used for desktop graphical user interfaces</li>
|
|
<li data-marpit-fragment="3">Helps to enforce <strong><em>separation of concerns</em></strong>
|
|
<ul>
|
|
<li data-marpit-fragment="4">When an entity in code has only a single job:
|
|
<ul>
|
|
<li data-marpit-fragment="5">It is easier to read and write</li>
|
|
<li data-marpit-fragment="6">It is easier to test and debug</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="7"><mjx-container class="MathJax" jax="SVG"><svg style="vertical-align: -0.054ex;" xmlns="http://www.w3.org/2000/svg" width="2.262ex" height="1.242ex" role="img" focusable="false" viewBox="0 -525 1000 549"><g stroke="currentColor" fill="currentColor" stroke-width="0" transform="scale(1,-1)"><g data-mml-node="math"><g data-mml-node="mo"><path data-c="21D2" d="M580 514Q580 525 596 525Q601 525 604 525T609 525T613 524T615 523T617 520T619 517T622 512Q659 438 720 381T831 300T927 263Q944 258 944 250T935 239T898 228T840 204Q696 134 622 -12Q618 -21 615 -22T600 -24Q580 -24 580 -17Q580 -13 585 0Q620 69 671 123L681 133H70Q56 140 56 153Q56 168 72 173H725L735 181Q774 211 852 250Q851 251 834 259T789 283T735 319L725 327H72Q56 332 56 347Q56 360 70 367H681L671 377Q638 412 609 458T580 514Z"></path></g></g></g></svg></mjx-container> It's easier to scale the application in complexity</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="8">ASP.NET Core includes an <a href="https://learn.microsoft.com/en-us/aspnet/core/mvc/overview?view=aspnetcore-9.0">MVC Framework</a> for implementing this design pattern</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="4" data-marpit-fragments="6" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="4" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="model-view-and-controller">Model, view and controller</h3>
|
|
<div class='columns' style='grid-template-columns: 0.7fr 1fr 1fr' markdown='1'>
|
|
<div markdown='1'>
|
|
<h4 id="model">Model</h4>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Representation of data in code</li>
|
|
<li data-marpit-fragment="2">Can also include some logic to retrieve and save the data</li>
|
|
</ul>
|
|
</div>
|
|
<div markdown='1'>
|
|
<h4 id="view">View</h4>
|
|
<ul>
|
|
<li data-marpit-fragment="3">The data that is shown to the client, e.g. a web page</li>
|
|
<li data-marpit-fragment="4">More often than not different from the Model - client does not need to (and often <em>shouldn't</em>) see all possible data</li>
|
|
</ul>
|
|
</div>
|
|
<div markdown='1'>
|
|
<h4 id="controller">Controller</h4>
|
|
<ul>
|
|
<li data-marpit-fragment="5">Communicates with the Model and the View</li>
|
|
<li data-marpit-fragment="6">How the data (models) will be processed before sending it forwards to the client or to the view</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="5" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="5" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="mvc-implementation">MVC implementation</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">In an ASP.NET Core API, the pattern is implemented like this:</li>
|
|
</ul>
|
|
<div class='columns111' markdown='1'>
|
|
<div markdown='1'>
|
|
<h4 id="model-1">Model</h4>
|
|
<p><code>Models/User.cs</code></p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">namespace</span> <span class="hljs-title">MyApi.Models</span>
|
|
{
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">User</span>
|
|
{
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">int</span> Id {<span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>;}
|
|
<span class="hljs-keyword">public</span> <span class="hljs-built_in">string</span> Name {<span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>;}
|
|
}
|
|
}
|
|
</code></pre>
|
|
</div>
|
|
<div markdown='1'>
|
|
<h4 id="view-1">View</h4>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp">{
|
|
<span class="hljs-string">"id"</span>: <span class="hljs-number">1</span>
|
|
<span class="hljs-string">"name"</span>: <span class="hljs-string">"Sonja"</span>
|
|
}
|
|
</code></pre>
|
|
<p>(Basically just JSON data that ASP.NET can show automatically)</p>
|
|
</div>
|
|
<div markdown='1'>
|
|
<h4 id="controller-1">Controller</h4>
|
|
<p><code>Controllers/UserController.cs</code></p>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">using</span> Microsoft.AspNetCore.Mvc;
|
|
<span class="hljs-keyword">using</span> MyApi.Models;
|
|
<span class="hljs-keyword">namespace</span> <span class="hljs-title">MyApi.Controllers</span>
|
|
{
|
|
[<span class="hljs-meta">ApiController</span>]
|
|
[<span class="hljs-meta">Route(<span class="hljs-string">"api/[controller]"</span>)</span>]
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">UserController</span> : <span class="hljs-title">ControllerBase</span>
|
|
{
|
|
[<span class="hljs-meta">HttpGet(<span class="hljs-string">"{id}"</span>)</span>]
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> IActionResult <span class="hljs-title">GetUser</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)
|
|
<span class="hljs-comment">// ...</span>
|
|
}
|
|
}
|
|
</span></code></pre>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="6" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="6" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="the-controller">The controller</h3>
|
|
<div class='columns32' markdown='1'>
|
|
<div markdown='1'>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">using</span> Microsoft.AspNetCore.Mvc;
|
|
<span class="hljs-keyword">using</span> MyApi.Models;
|
|
<span class="hljs-keyword">namespace</span> <span class="hljs-title">MyApi.Controllers</span>
|
|
{
|
|
[<span class="hljs-meta">ApiController</span>]
|
|
[<span class="hljs-meta">Route(<span class="hljs-string">"api/[controller]"</span>)</span>]
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">UserController</span> : <span class="hljs-title">ControllerBase</span>
|
|
{
|
|
[<span class="hljs-meta">HttpGet(<span class="hljs-string">"{id}"</span>)</span>]
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> IActionResult <span class="hljs-title">GetUser</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span>
|
|
{
|
|
<span class="hljs-keyword">var</span> person = <span class="hljs-keyword">new</span> Person
|
|
{
|
|
Id = <span class="hljs-number">1</span>,
|
|
Name = <span class="hljs-string">"Sonja"</span>
|
|
};
|
|
<span class="hljs-keyword">return</span> Ok(person);
|
|
}
|
|
}
|
|
}
|
|
</code></pre>
|
|
</div>
|
|
<div markdown='1'>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Here's an extended implementation of the earlier controller, showcasing the HTTP <code>GET</code> method</li>
|
|
<li data-marpit-fragment="2">The object that gets sent to the View (the webpage) as a JSON is just hardcoded here, but normally the data comes from a <em><strong>database</strong></em></li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="7" data-marpit-fragments="4" data-paginate="true" data-class="exercise invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="exercise invert" data-marpit-pagination="7" style="--paginate:true;--class:exercise invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="exercise-1-setting-up-the-project">Exercise 1. Setting up the Project</h3>
|
|
|
|
<ol>
|
|
<li data-marpit-fragment="1">Create a new ASP.NET Core Web API template project. Name it <code>CourseAPI</code>. Delete <code>WeatherForecastController.cs</code> and <code>WeatherForecast.cs</code>.</li>
|
|
<li data-marpit-fragment="2">Add a new controller <code>CoursesController</code> by right-clicking the <code>Controllers</code> folder and selecting <em>Add > Controller... > API Controller > Empty</em></li>
|
|
<li data-marpit-fragment="3">Add a new folder <code>Models</code>. Inside, add a new class file ( <em>Add > Class...</em> ) named <code>Course.cs</code></li>
|
|
</ol>
|
|
<ul>
|
|
<li data-marpit-fragment="4">To the Course class, create the properties <code>int Id</code>, <code>string Name</code> and <code>int Credits</code></li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="8" data-marpit-fragments="2" data-paginate="true" data-class="exercise invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="exercise invert" data-marpit-pagination="8" style="--paginate:true;--class:exercise invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="exercise-2-creating-get-endpoints">Exercise 2. Creating <code>GET</code> endpoints</h3>
|
|
|
|
<ol>
|
|
<li data-marpit-fragment="1">Inside the Controller class, initialize a list of courses with a couple of test courses</li>
|
|
<li data-marpit-fragment="2">Create endpoints for <code>GET</code> requests with URIs <code>api/courses</code> and <code>api/courses/{id}</code> which return all courses and a single course with a corresponding ID, respectively</li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="9" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="9" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h2 id="repositories">Repositories</h2>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="10" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="10" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="accessing-data-with-repositories">Accessing data with repositories</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">When following the <strong><em>separation of concerns</em></strong> principle, the controllers or models should NOT be accessing the database directly</li>
|
|
<li data-marpit-fragment="2">Instead, the web app should have some kind of <em><strong>repository</strong></em> for reading from and writing to the database
|
|
<ul>
|
|
<li data-marpit-fragment="3">(Not to be confused with a Git repository!)</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="4">For now, we can just create a mock repository to a new folder called <code>Repositories</code> for our needs, and make it static so that it can be accessed everywhere
|
|
<ul>
|
|
<li data-marpit-fragment="5">Later on, we will add services to make the repository available within our program via <em><strong>dependency injection</strong></em></li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="11" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="11" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="repository-example">Repository Example</h3>
|
|
<div class='columns32' markdown='1'>
|
|
<div markdown='1'>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-comment">// Repositories/ContactRepository.cs</span>
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">MockRepo</span>
|
|
{
|
|
<span class="hljs-comment">// Replace this later on with a database context</span>
|
|
<span class="hljs-keyword">private</span> List<Contact> Contacts { <span class="hljs-keyword">get</span>; <span class="hljs-keyword">set</span>; }
|
|
<span class="hljs-comment">// Constructor to initialize contact list</span>
|
|
<span class="hljs-function"><span class="hljs-keyword">private</span> <span class="hljs-title">MockRepo</span>()</span>
|
|
{
|
|
Contacts = <span class="hljs-keyword">new</span> List<Contact>();
|
|
}
|
|
<span class="hljs-comment">// Replace this later on with dependency injection</span>
|
|
<span class="hljs-keyword">public</span> <span class="hljs-keyword">static</span> MockRepo Instance { <span class="hljs-keyword">get</span>; } =
|
|
<span class="hljs-keyword">new</span> MockRepo();
|
|
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> List<Contact> <span class="hljs-title">GetContacts</span>()</span> => Contacts;
|
|
|
|
<span class="hljs-comment">// Update database here later</span>
|
|
<span class="hljs-comment">// Other methods to read/write from database</span>
|
|
<span class="hljs-comment">// ...</span>
|
|
}
|
|
</code></pre>
|
|
</div>
|
|
<div markdown='1'>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-comment">// Controllers/ContactsController.cs</span>
|
|
<span class="hljs-comment">// ...</span>
|
|
[<span class="hljs-meta">HttpGet</span>]
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> List<Contact> <span class="hljs-title">Get</span>()</span>
|
|
{
|
|
<span class="hljs-keyword">return</span> MockRepo.Instance.GetContacts();
|
|
}
|
|
<span class="hljs-comment">// ...</span>
|
|
</code></pre>
|
|
<ul>
|
|
<li data-marpit-fragment="1">At this point, implementation of the "database" is up to you</li>
|
|
<li data-marpit-fragment="2">Later, a real database is added</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="12" data-marpit-fragments="3" data-paginate="true" data-class="exercise invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="exercise invert" data-marpit-pagination="12" style="--paginate:true;--class:exercise invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="exercise-3-using-a-repository">Exercise 3: Using a Repository</h3>
|
|
|
|
<p>Continue working on CourseAPI.</p>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Within the solution, create a folder called <code>Repositories</code></li>
|
|
<li data-marpit-fragment="2">Add a mock repository to the folder. Move the course list from the controller to the repository to simulate our database for now. Add methods to get all courses in the list and a single course by ID.</li>
|
|
<li data-marpit-fragment="3">Modify the controller so that it uses the repository for getting courses.</li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="13" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="13" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h2 id="services">Services</h2>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="14" data-marpit-fragments="9" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="14" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="repository-as-a-service">Repository, as a service</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Services and <a href="https://docs.microsoft.com/en-us/aspnet/core/fundamentals/dependency-injection?view=aspnetcore-2.1">dependency injection (DI)</a> have been introduced earlier in this training
|
|
<ul>
|
|
<li data-marpit-fragment="2"><a href="https://gitea.buutti.com/education/csharp-basics/src/branch/main/15-design-patterns-in-csharp.md#dependency-injection">C# Basics: Lecture 15: Dependency injection</a>, <a href="1-aspnet-introduction#services">Lecture 1: Services</a></li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="3">Recap: DI allows for <em><strong>loose coupling</strong></em> between classes and their dependencies
|
|
<ul>
|
|
<li data-marpit-fragment="4">This decreases complexity, makes refactoring easier and increases code testability</li>
|
|
</ul>
|
|
</li>
|
|
<li data-marpit-fragment="5">DI is used in ASP.NET to distribute services to classes in a controlled way</li>
|
|
<li data-marpit-fragment="6">Let's get started by making a repository service
|
|
<ul>
|
|
<li data-marpit-fragment="7">Recap: Repositories are the interface for handling operations to a database</li>
|
|
<li data-marpit-fragment="8">Repositories should be accessible within the API from multiple controllers</li>
|
|
<li data-marpit-fragment="9">Logical step is to make it a service!</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="15" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="15" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="service-interface">Service interface</h3>
|
|
<div class='columns' markdown='1'>
|
|
<div markdown='1'>
|
|
<ul>
|
|
<li data-marpit-fragment="1">
|
|
<p>Create a <em><strong>service interface</strong></em> and a class implementing it:<br />
|
|
<img src="imgs/4-mvc-pattern-and-repositories_0.png" alt="" /></p>
|
|
</li>
|
|
<li data-marpit-fragment="2">
|
|
<p><em><strong>A rule of thumb:</strong></em> Create a separate repository for all <em><strong>tightly coupled</strong></em> models, not necessarily every model</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div markdown='1'>
|
|
<ul>
|
|
<li data-marpit-fragment="3">Add <strong><em>all</em></strong> methods of the service to the interface:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">interface</span> <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-function">Contact <span class="hljs-title">GetContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span>;
|
|
<span class="hljs-function">List<Contact> <span class="hljs-title">GetContacts</span>()</span>;
|
|
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">AddContact</span>(<span class="hljs-params">Contact contact</span>)</span>;
|
|
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">UpdateContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id, Contact contact</span>)</span>;
|
|
<span class="hljs-function"><span class="hljs-keyword">void</span> <span class="hljs-title">DeleteContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span>;
|
|
|
|
<span class="hljs-comment">// UpdateDataBase() later on...</span>
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
<ul>
|
|
<li data-marpit-fragment="4">Next, we'll create a class that implements this interface.</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="16" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="16" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="implementing-the-interface">Implementing the interface</h3>
|
|
<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactRepository</span> : <span class="hljs-title">IContactRepository</span>
|
|
{
|
|
<span class="hljs-comment">// Replace this with database context in a real life application</span>
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">static</span> List<Contact> Contacts = <span class="hljs-keyword">new</span> List<Contact>
|
|
{
|
|
<span class="hljs-keyword">new</span> Contact{Id=<span class="hljs-number">0</span>, Name=<span class="hljs-string">"Johannes Kantola"</span>, Email=<span class="hljs-string">"johkant@example.com"</span>},
|
|
<span class="hljs-keyword">new</span> Contact{Id=<span class="hljs-number">1</span>, Name=<span class="hljs-string">"Rene Orosz"</span>, Email=<span class="hljs-string">"rene_king@example.com"</span>}
|
|
};
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">AddContact</span>(<span class="hljs-params">Contact contact</span>)</span> => Contacts.Add(contact);
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">DeleteContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span> =>
|
|
Contacts = Contacts.Where(c => c.Id != id).ToList();
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> Contact <span class="hljs-title">GetContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span> => Contacts.FirstOrDefault(c => c.Id == id);
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> List<Contact> <span class="hljs-title">GetContacts</span>()</span> => Contacts;
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-keyword">void</span> <span class="hljs-title">UpdateContact</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id, Contact newContact</span>)</span> =>
|
|
Contacts = Contacts.Select(c => c.Id != id ? c : newContact).ToList();
|
|
}
|
|
</code></pre>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="17" data-marpit-fragments="1" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="17" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="adding-the-service-to-programcs">Adding the service to <code>Program.cs</code></h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">The service is now ready to be added to the container in the Program.cs file:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-comment">// ...</span>
|
|
builder.Services.AddSingleton<IContactRepository, ContactRepository>();
|
|
builder.Services.AddControllers().AddNewtonsoftJson();
|
|
<span class="hljs-comment">// ...</span>
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="18" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="18" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="using-the-service-in-a-controller">Using the service in a controller</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Add the service to your controller by creating a constructor and passing it as a parameter:<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp"><span class="hljs-keyword">public</span> <span class="hljs-keyword">class</span> <span class="hljs-title">ContactsController</span> : <span class="hljs-title">ControllerBase</span>
|
|
{
|
|
<span class="hljs-keyword">private</span> <span class="hljs-keyword">readonly</span> IContactRepository _contactRepository;
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> <span class="hljs-title">ContactsController</span>(<span class="hljs-params">IContactRepository contactRepository</span>)</span>
|
|
{
|
|
_contactRepository = contactRepository;
|
|
}
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
<li data-marpit-fragment="2">If you need to add more services to the controller later, you can just add them as a parameter as well - the order of parameters does not matter!</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="19" data-marpit-fragments="2" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="19" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="consuming-the-service-in-endpoints">Consuming the service in endpoints</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">Your service is now ready to be consumed by the controller</li>
|
|
<li data-marpit-fragment="2">No need to use <code>MockRepo.Instance.GetContacts()</code> anymore!<pre is="marp-pre" data-auto-scaling="downscale-only"><code class="language-csharp">[<span class="hljs-meta">HttpGet(<span class="hljs-string">"{id}"</span>)</span>]
|
|
<span class="hljs-function"><span class="hljs-keyword">public</span> IActionResult <span class="hljs-title">GetContactById</span>(<span class="hljs-params"><span class="hljs-built_in">int</span> id</span>)</span>
|
|
{
|
|
Contact contact = _contactRepository.GetContact(id);
|
|
<span class="hljs-keyword">if</span> (contact == <span class="hljs-literal">null</span>)
|
|
{
|
|
<span class="hljs-keyword">return</span> NotFound();
|
|
}
|
|
<span class="hljs-keyword">return</span> Ok(contact);
|
|
}
|
|
</code></pre>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="20" data-marpit-fragments="2" data-paginate="true" data-class="exercise invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="exercise invert" data-marpit-pagination="20" style="--paginate:true;--class:exercise invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="exercise-4-a-real-repository">Exercise 4: A real repository</h3>
|
|
|
|
<p>Continue working on CourseAPI.</p>
|
|
<ol>
|
|
<li data-marpit-fragment="1">Create an interface <code>ICourseRepository</code> with methods for getting a single course or all courses. Rename your mock repository to <code>CourseRepository</code> and make sure the interface is fully implemented.</li>
|
|
<li data-marpit-fragment="2">Add <code>CourseRepository</code> as a service, and refactor the controller to use methods for <code>ICourseRepository</code></li>
|
|
</ol>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="21" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="21" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h2 id="wrapping-things-up">Wrapping Things Up</h2>
|
|
<p>At this point, the flow of your API should be in line with this chart:</p>
|
|
<p><img src="imgs/api-chart.svg" alt="" /></p>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="22" data-marpit-fragments="4" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="22" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="project-hierarchy">Project hierarchy</h3>
|
|
<div class='columns32' markdown='1'>
|
|
<div markdown='1'>
|
|
<ul>
|
|
<li data-marpit-fragment="1">In solution explorer, the project hierarchy would look like this.</li>
|
|
<li data-marpit-fragment="2">Once you start adding new classes, they should have their own models and controllers</li>
|
|
<li data-marpit-fragment="3">One repository can store multiple models, and there can be multiple repositories
|
|
<ul>
|
|
<li data-marpit-fragment="4">Every server/database/API you use should have its own repository!</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
<div markdown='1'>
|
|
<p><img src="imgs/4-mvc-pattern-and-repositories_1.png" alt="" /></p>
|
|
</div>
|
|
</div>
|
|
</section>
|
|
</foreignObject></svg><svg data-marpit-svg="" viewBox="0 0 1280 720"><foreignObject width="1280" height="720"><section id="23" data-marpit-fragments="5" data-paginate="true" data-class="invert" data-heading-divider="3" data-theme="gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs" lang="en-US" class="invert" data-marpit-pagination="23" style="--paginate:true;--class:invert;--heading-divider:3;--theme:gsqjzy04cqa5pnu0wert68v4d2h1nub4hm2m1sg24qs;" data-marpit-pagination-total="23">
|
|
<h3 id="what-the-heck-does-this-do">What the Heck Does This Do?</h3>
|
|
<ul>
|
|
<li data-marpit-fragment="1">A lot of the functionality in ASP.NET comes from the base class library</li>
|
|
<li data-marpit-fragment="2">When starting out, trying to remember all the methods and what does what can feel overwhelming</li>
|
|
<li data-marpit-fragment="3">If you ever end up getting confused what any method does, Ctrl + click <em>Type name</em> to go to definition
|
|
<ul>
|
|
<li data-marpit-fragment="4">There is always a summary about the method</li>
|
|
<li data-marpit-fragment="5">Also looking up the method from Microsoft documentation is helpful</li>
|
|
</ul>
|
|
</li>
|
|
</ul>
|
|
</section>
|
|
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