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1521 lines (1425 loc) · 60.2 KB
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<!DOCTYPE html>
<html lang="ko">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Ch.12 디자인 패턴 | CS Visualizer</title>
<link href="https://fonts.googleapis.com/css2?family=JetBrains+Mono:wght@300;400;500;600;700&family=Noto+Sans+KR:wght@300;400;500;700&display=swap" rel="stylesheet">
<link rel="stylesheet" href="style.css">
<style>
/* ── Ch12 tag ── */
.tag-ch12 { background: rgba(139,92,246,0.15); color: #8b5cf6; border: 1px solid rgba(139,92,246,0.3); }
/* ── Shared helpers ── */
.flex-row { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.flex-col { display: flex; flex-direction: column; gap: 10px; }
.code-block {
background: var(--bg);
border: 1px solid var(--border);
border-radius: 8px;
padding: 16px 18px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
color: #c9d1d9;
line-height: 1.9;
overflow-x: auto;
white-space: pre;
}
.kw { color: #ff79c6; }
.fn { color: #50fa7b; }
.str { color: #f1fa8c; }
.cm { color: #6272a4; }
.num { color: #bd93f9; }
.cls { color: #8be9fd; }
/* ── Arrow helper ── */
.arrow-right { display: inline-block; margin: 0 6px; color: var(--text-dim); font-size: 1.1rem; }
.arrow-down { display: block; text-align: center; color: var(--text-dim); font-size: 1.2rem; line-height: 1.2; }
/* ═══════════════════════════════════════════
SECTION 1 — SINGLETON
════════════════════════════════════════════ */
.singleton-diagram {
display: flex;
align-items: center;
gap: 0;
justify-content: center;
flex-wrap: wrap;
margin: 20px 0;
}
.caller-stack {
display: flex;
flex-direction: column;
gap: 8px;
}
.caller-box {
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 8px;
padding: 8px 14px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
color: var(--text-dim);
transition: all 0.3s;
}
.caller-box.active {
border-color: #8b5cf6;
color: #8b5cf6;
background: rgba(139,92,246,0.1);
box-shadow: 0 0 10px rgba(139,92,246,0.2);
}
.arrows-middle {
display: flex;
flex-direction: column;
gap: 8px;
margin: 0 16px;
}
.arrow-line {
width: 50px;
height: 2px;
background: var(--border);
position: relative;
transition: background 0.3s;
align-self: center;
}
.arrow-line::after {
content: '▶';
position: absolute;
right: -8px;
top: -8px;
font-size: 10px;
color: var(--border);
transition: color 0.3s;
}
.arrow-line.active { background: #8b5cf6; }
.arrow-line.active::after { color: #8b5cf6; }
.singleton-instance {
background: linear-gradient(135deg, rgba(139,92,246,0.15), rgba(139,92,246,0.05));
border: 2px solid #8b5cf6;
border-radius: 12px;
padding: 18px 24px;
text-align: center;
box-shadow: 0 0 20px rgba(139,92,246,0.2);
}
.singleton-instance .inst-label {
font-family: 'JetBrains Mono', monospace;
font-size: 0.72rem;
color: #8b5cf6;
letter-spacing: 2px;
margin-bottom: 4px;
}
.singleton-instance .inst-name {
font-family: 'JetBrains Mono', monospace;
font-size: 1rem;
font-weight: 600;
color: var(--text);
}
.singleton-instance .inst-addr {
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
color: var(--accent);
margin-top: 4px;
}
.log-box {
background: var(--bg);
border: 1px solid var(--border);
border-radius: 8px;
padding: 12px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
min-height: 100px;
max-height: 200px;
overflow-y: auto;
color: var(--text-dim);
}
.log-entry { line-height: 2; border-bottom: 1px solid rgba(255,255,255,0.04); }
.log-entry .log-same { color: var(--accent); }
.log-entry .log-addr { color: #8b5cf6; }
.log-entry .log-label { color: var(--text-dim); }
/* ═══════════════════════════════════════════
SECTION 2 — FACTORY
════════════════════════════════════════════ */
.factory-selector {
display: flex;
gap: 10px;
justify-content: center;
margin: 16px 0;
flex-wrap: wrap;
}
.shape-btn {
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 8px;
padding: 10px 20px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.85rem;
color: var(--text-dim);
cursor: pointer;
transition: all 0.25s;
}
.shape-btn:hover, .shape-btn.selected {
border-color: var(--accent3);
color: var(--accent3);
background: rgba(107,138,255,0.1);
}
.factory-diagram {
display: flex;
align-items: center;
justify-content: center;
gap: 16px;
margin: 20px 0;
flex-wrap: wrap;
}
.factory-node {
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 10px;
padding: 14px 18px;
text-align: center;
font-family: 'JetBrains Mono', monospace;
font-size: 0.82rem;
min-width: 110px;
transition: all 0.3s;
}
.factory-node.client { border-color: var(--accent4); color: var(--accent4); }
.factory-node.factory-box { border-color: var(--accent3); color: var(--accent3); background: rgba(107,138,255,0.08); }
.factory-node.product { border-color: var(--accent); color: var(--accent); }
.factory-node.active-product {
box-shadow: 0 0 16px rgba(0,255,170,0.3);
transform: scale(1.05);
}
.shape-canvas {
display: flex;
align-items: center;
justify-content: center;
height: 140px;
background: var(--bg);
border: 1px solid var(--border);
border-radius: 10px;
margin: 16px 0;
position: relative;
overflow: hidden;
}
.shape-canvas svg { transition: all 0.4s; }
.shape-info-row {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 14px;
margin-top: 14px;
}
.shape-info-card {
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 8px;
padding: 12px;
}
.shape-info-card .card-label {
font-family: 'JetBrains Mono', monospace;
font-size: 0.7rem;
color: var(--text-dim);
letter-spacing: 1px;
margin-bottom: 6px;
}
/* ═══════════════════════════════════════════
SECTION 3 — OBSERVER
════════════════════════════════════════════ */
.observer-layout {
display: grid;
grid-template-columns: 1fr auto 1fr;
gap: 20px;
align-items: start;
margin: 16px 0;
}
@media (max-width: 680px) {
.observer-layout { grid-template-columns: 1fr; }
}
.publisher-box {
background: linear-gradient(135deg, rgba(255,107,157,0.1), rgba(255,107,157,0.04));
border: 2px solid var(--accent2);
border-radius: 12px;
padding: 18px;
text-align: center;
}
.publisher-box .pub-title {
font-family: 'JetBrains Mono', monospace;
font-size: 0.72rem;
letter-spacing: 2px;
color: var(--accent2);
margin-bottom: 6px;
}
.publisher-box .pub-name {
font-size: 1.1rem;
font-weight: 700;
margin-bottom: 12px;
}
.observer-arrows {
display: flex;
flex-direction: column;
align-items: center;
justify-content: center;
gap: 6px;
font-family: 'JetBrains Mono', monospace;
font-size: 1.4rem;
color: var(--border);
padding-top: 20px;
}
.observer-arrows.broadcasting {
color: var(--accent2);
animation: pulseArrow 0.5s ease-in-out 3;
}
@keyframes pulseArrow {
0%,100% { opacity: 1; transform: scale(1); }
50% { opacity: 0.4; transform: scale(0.9); }
}
.subscribers-col {
display: flex;
flex-direction: column;
gap: 10px;
}
.subscriber-item {
display: flex;
align-items: center;
gap: 10px;
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 10px;
padding: 10px 14px;
transition: all 0.3s;
position: relative;
overflow: hidden;
}
.subscriber-item::before {
content: '';
position: absolute;
inset: 0;
background: linear-gradient(90deg, rgba(0,255,170,0.15), transparent);
transform: translateX(-100%);
transition: transform 0.4s;
}
.subscriber-item.notified::before { transform: translateX(0); }
.subscriber-item.notified {
border-color: var(--accent);
box-shadow: 0 0 12px rgba(0,255,170,0.2);
}
.subscriber-item.removed {
opacity: 0.3;
border-style: dashed;
}
.sub-icon {
width: 32px;
height: 32px;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
font-size: 1rem;
flex-shrink: 0;
}
.sub-name {
font-family: 'JetBrains Mono', monospace;
font-size: 0.82rem;
flex: 1;
}
.sub-status {
font-family: 'JetBrains Mono', monospace;
font-size: 0.72rem;
color: var(--text-dim);
transition: color 0.3s;
}
.subscriber-item.notified .sub-status { color: var(--accent); }
.obs-controls { display: flex; gap: 10px; flex-wrap: wrap; margin: 14px 0; }
.obs-log {
background: var(--bg);
border: 1px solid var(--border);
border-radius: 8px;
padding: 12px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.77rem;
min-height: 80px;
max-height: 160px;
overflow-y: auto;
color: var(--text-dim);
line-height: 2;
}
/* ═══════════════════════════════════════════
SECTION 4 — STRATEGY
════════════════════════════════════════════ */
.strategy-grid {
display: grid;
grid-template-columns: repeat(3, 1fr);
gap: 12px;
margin: 16px 0;
}
@media (max-width: 600px) { .strategy-grid { grid-template-columns: 1fr; } }
.strategy-card {
background: var(--surface2);
border: 2px solid var(--border);
border-radius: 12px;
padding: 16px;
cursor: pointer;
transition: all 0.25s;
text-align: center;
}
.strategy-card:hover { border-color: var(--accent3); background: rgba(107,138,255,0.08); }
.strategy-card.active {
border-color: var(--accent4);
background: rgba(255,170,0,0.1);
box-shadow: 0 0 16px rgba(255,170,0,0.2);
}
.strategy-icon { font-size: 2rem; margin-bottom: 6px; }
.strategy-name {
font-family: 'JetBrains Mono', monospace;
font-size: 0.85rem;
font-weight: 600;
margin-bottom: 4px;
}
.strategy-desc { font-size: 0.78rem; color: var(--text-dim); }
.payment-flow {
background: var(--bg);
border: 1px solid var(--border);
border-radius: 10px;
padding: 16px;
margin: 14px 0;
min-height: 130px;
}
.payment-step {
display: flex;
align-items: center;
gap: 10px;
padding: 6px 0;
font-family: 'JetBrains Mono', monospace;
font-size: 0.8rem;
opacity: 0;
transform: translateX(-10px);
transition: all 0.3s;
}
.payment-step.visible { opacity: 1; transform: translateX(0); }
.step-num {
width: 22px;
height: 22px;
border-radius: 50%;
background: var(--accent4);
color: var(--bg);
display: flex;
align-items: center;
justify-content: center;
font-size: 0.7rem;
font-weight: 700;
flex-shrink: 0;
}
.context-box {
background: var(--surface2);
border: 1px solid var(--accent3);
border-radius: 10px;
padding: 14px 18px;
margin-bottom: 14px;
display: flex;
align-items: center;
gap: 14px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.82rem;
}
.context-label {
color: var(--accent3);
font-size: 0.72rem;
letter-spacing: 1px;
margin-bottom: 2px;
}
.code-compare {
display: grid;
grid-template-columns: 1fr 1fr;
gap: 14px;
margin-top: 16px;
}
@media (max-width: 620px) { .code-compare { grid-template-columns: 1fr; } }
.compare-col-label {
font-family: 'JetBrains Mono', monospace;
font-size: 0.72rem;
letter-spacing: 1px;
margin-bottom: 8px;
padding: 4px 10px;
border-radius: 4px;
display: inline-block;
}
.bad-label { background: rgba(255,68,102,0.15); color: var(--danger); }
.good-label { background: rgba(0,255,170,0.1); color: var(--accent); }
/* ═══════════════════════════════════════════
SECTION 5 — MVC / MVP / MVVM
════════════════════════════════════════════ */
.arch-tabs {
display: flex;
gap: 0;
border: 1px solid var(--border);
border-radius: 10px;
overflow: hidden;
margin-bottom: 20px;
width: fit-content;
}
.arch-tab {
padding: 10px 22px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.82rem;
cursor: pointer;
background: var(--surface2);
color: var(--text-dim);
border: none;
transition: all 0.2s;
border-right: 1px solid var(--border);
}
.arch-tab:last-child { border-right: none; }
.arch-tab:hover { background: rgba(139,92,246,0.1); color: var(--text); }
.arch-tab.active { background: rgba(139,92,246,0.2); color: #8b5cf6; font-weight: 600; }
.arch-panel { display: none; }
.arch-panel.active { display: block; }
.arch-diagram {
display: flex;
align-items: center;
justify-content: center;
gap: 0;
margin: 20px 0;
flex-wrap: wrap;
}
.arch-node {
background: var(--surface2);
border: 2px solid var(--border);
border-radius: 10px;
padding: 14px 18px;
text-align: center;
min-width: 110px;
transition: all 0.4s;
position: relative;
}
.arch-node .node-label {
font-family: 'JetBrains Mono', monospace;
font-size: 0.72rem;
letter-spacing: 1px;
margin-bottom: 4px;
}
.arch-node .node-name {
font-family: 'JetBrains Mono', monospace;
font-size: 1rem;
font-weight: 700;
}
.arch-node.model { border-color: var(--accent3); }
.arch-node.view { border-color: var(--accent2); }
.arch-node.ctrl { border-color: var(--accent); }
.arch-node.presenter { border-color: var(--accent); }
.arch-node.viewmodel { border-color: var(--accent4); }
.arch-node.model .node-label { color: var(--accent3); }
.arch-node.view .node-label { color: var(--accent2); }
.arch-node.ctrl .node-label { color: var(--accent); }
.arch-node.presenter .node-label { color: var(--accent); }
.arch-node.viewmodel .node-label { color: var(--accent4); }
.arch-node.highlighted {
box-shadow: 0 0 20px rgba(139,92,246,0.4);
border-color: #8b5cf6 !important;
transform: scale(1.06);
}
.arch-arrow {
display: flex;
flex-direction: column;
align-items: center;
padding: 0 8px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.65rem;
color: var(--text-dim);
gap: 2px;
min-width: 60px;
}
.arch-arrow .arr-line {
height: 2px;
width: 100%;
background: var(--border);
position: relative;
}
.arch-arrow .arr-label { text-align: center; white-space: nowrap; }
.arch-arrow.bidirectional .arr-line::before,
.arch-arrow.bidirectional .arr-line::after {
content: '';
position: absolute;
width: 6px;
height: 6px;
border: 2px solid var(--border);
border-left: none;
border-bottom: none;
top: -3px;
}
.arch-arrow.bidirectional .arr-line::after {
right: 0; transform: rotate(45deg);
}
.arch-arrow.bidirectional .arr-line::before {
left: 0; transform: rotate(-135deg);
}
.arch-arrow.unidirectional .arr-line::after {
content: '';
position: absolute;
right: -1px; top: -3px;
width: 6px; height: 6px;
border: 2px solid var(--border);
border-left: none; border-bottom: none;
transform: rotate(45deg);
}
.arch-desc {
background: var(--surface2);
border: 1px solid var(--border);
border-radius: 10px;
padding: 16px 20px;
margin: 14px 0;
font-size: 0.87rem;
line-height: 1.8;
}
.arch-desc .arch-desc-title {
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
letter-spacing: 1px;
margin-bottom: 8px;
color: #8b5cf6;
}
.flow-trace {
background: var(--bg);
border: 1px solid var(--border);
border-radius: 8px;
padding: 12px 16px;
margin-top: 12px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.78rem;
line-height: 2;
min-height: 60px;
color: var(--text-dim);
}
.flow-step { opacity: 0; transition: opacity 0.3s; }
.flow-step.show { opacity: 1; }
.flow-step .fs-label { color: #8b5cf6; }
.flow-step .fs-arrow { color: var(--accent4); margin: 0 6px; }
.realworld-row {
display: flex;
gap: 10px;
flex-wrap: wrap;
margin-top: 10px;
}
.rw-badge {
background: rgba(139,92,246,0.12);
border: 1px solid rgba(139,92,246,0.3);
border-radius: 20px;
padding: 4px 12px;
font-family: 'JetBrains Mono', monospace;
font-size: 0.75rem;
color: #8b5cf6;
}
</style>
</head>
<body class="page-body">
<nav class="page-nav">
<a href="index.html" class="nav-back">← 홈</a>
<div class="nav-chapter-title" style="color:#8b5cf6">Ch.12 — 디자인 패턴</div>
<div class="nav-sections">
<a href="#singleton" class="nav-sec-link">싱글톤</a>
<a href="#factory" class="nav-sec-link">팩토리</a>
<a href="#observer" class="nav-sec-link">옵저버</a>
<a href="#strategy" class="nav-sec-link">전략</a>
<a href="#mvc" class="nav-sec-link">MVC/MVP/MVVM</a>
</div>
</nav>
<!-- ══════════════════════════════════════════════
SECTION 1 — 싱글톤 패턴
══════════════════════════════════════════════ -->
<section id="singleton">
<div class="section-header">
<div class="tag tag-ch12">01 — SINGLETON PATTERN</div>
<h2>싱글톤 패턴</h2>
<p>클래스의 인스턴스가 오직 <strong>하나</strong>만 존재하도록 보장하고, 그 인스턴스에 전역 접근점을 제공하는 패턴입니다. "new"를 아무리 많이 호출해도 항상 같은 객체를 반환합니다.</p>
</div>
<div class="viz-box">
<!-- Diagram -->
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);letter-spacing:1px;margin-bottom:12px;">STRUCTURE DIAGRAM</div>
<div class="singleton-diagram">
<div class="caller-stack">
<div class="caller-box" id="caller1">Caller A<br><span style="color:var(--text-dim);font-size:0.7rem">new Instance()</span></div>
<div class="caller-box" id="caller2">Caller B<br><span style="color:var(--text-dim);font-size:0.7rem">new Instance()</span></div>
<div class="caller-box" id="caller3">Caller C<br><span style="color:var(--text-dim);font-size:0.7rem">new Instance()</span></div>
</div>
<div class="arrows-middle">
<div class="arrow-line" id="arr1"></div>
<div class="arrow-line" id="arr2"></div>
<div class="arrow-line" id="arr3"></div>
</div>
<div class="singleton-instance">
<div class="inst-label">SINGLE INSTANCE</div>
<div class="inst-name">DatabaseConnection</div>
<div class="inst-addr" id="singletonAddr">0x7f4a2b3c</div>
<div style="margin-top:8px;font-family:'JetBrains Mono',monospace;font-size:0.7rem;color:var(--text-dim)">host: localhost:5432<br>pool: 10 connections</div>
</div>
</div>
<!-- Button + log -->
<div class="flex-row" style="margin:16px 0 10px">
<button class="btn" onclick="createSingletonInstance()">인스턴스 생성</button>
<button class="btn" onclick="resetSingleton()" style="background:transparent;border-color:var(--danger);color:var(--danger)">리셋</button>
<span id="singletonCount" style="font-family:'JetBrains Mono',monospace;font-size:0.8rem;color:var(--text-dim)">생성 횟수: 0</span>
</div>
<div class="log-box" id="singletonLog">
<div style="color:var(--text-dim);font-style:italic">// 버튼을 클릭하면 인스턴스 참조가 로그됩니다...</div>
</div>
<!-- Code snippet -->
<div style="margin-top:20px;font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);letter-spacing:1px;margin-bottom:8px;">DOUBLE-CHECKED LOCKING (Java)</div>
<div class="code-block"><span class="kw">public class</span> <span class="cls">DatabaseConnection</span> {
<span class="kw">private static volatile</span> <span class="cls">DatabaseConnection</span> instance = <span class="kw">null</span>;
<span class="kw">private</span> <span class="cls">String</span> host;
<span class="kw">private</span> <span class="cls">ConnectionPool</span> pool;
<span class="cm">// private 생성자 — 외부에서 new 불가</span>
<span class="kw">private</span> <span class="fn">DatabaseConnection</span>() {
<span class="kw">this</span>.host = <span class="str">"localhost:5432"</span>;
<span class="kw">this</span>.pool = <span class="kw">new</span> <span class="cls">ConnectionPool</span>(<span class="num">10</span>);
}
<span class="kw">public static</span> <span class="cls">DatabaseConnection</span> <span class="fn">getInstance</span>() {
<span class="kw">if</span> (instance == <span class="kw">null</span>) { <span class="cm">// 1차 체크 (비용 절감)</span>
<span class="kw">synchronized</span> (<span class="cls">DatabaseConnection</span>.class) {
<span class="kw">if</span> (instance == <span class="kw">null</span>) { <span class="cm">// 2차 체크 (스레드 안전)</span>
instance = <span class="kw">new</span> <span class="cls">DatabaseConnection</span>();
}
}
}
<span class="kw">return</span> instance;
}
}</div>
<!-- Use cases -->
<div class="info-text" style="margin-top:16px">
<strong style="color:#8b5cf6">사용 사례:</strong>
DB 커넥션 풀 · Logger · 설정(Config) 관리자 · 캐시 관리자 · 스레드 풀
</div>
</div>
</section>
<div class="section-divider"></div>
<!-- ══════════════════════════════════════════════
SECTION 2 — 팩토리 패턴
══════════════════════════════════════════════ -->
<section id="factory">
<div class="section-header">
<div class="tag tag-ch12">02 — FACTORY PATTERN</div>
<h2>팩토리 패턴</h2>
<p>객체 생성 로직을 클라이언트로부터 분리하여 <strong>팩토리 클래스</strong>에 위임하는 패턴입니다. 클라이언트는 구체적인 클래스를 알 필요 없이 공통 인터페이스를 통해 객체를 요청합니다.</p>
</div>
<div class="viz-box">
<!-- Shape selector -->
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);letter-spacing:1px;margin-bottom:10px;">도형 타입을 선택하면 팩토리가 해당 객체를 생성합니다</div>
<div class="factory-selector">
<button class="shape-btn selected" id="btn-circle" onclick="selectShape('circle')">● Circle</button>
<button class="shape-btn" id="btn-rect" onclick="selectShape('rect')">▬ Rectangle</button>
<button class="shape-btn" id="btn-triangle" onclick="selectShape('triangle')">▲ Triangle</button>
</div>
<!-- Flow diagram -->
<div class="factory-diagram">
<div class="factory-node client">
<div style="font-size:0.7rem;margin-bottom:2px;color:var(--accent4)">CLIENT</div>
<div style="font-size:0.82rem">createShape(<span id="factoryArg" style="color:var(--text)">"circle"</span>)</div>
</div>
<div class="arch-arrow unidirectional" style="min-width:40px">
<div class="arr-line"></div>
<div class="arr-label">요청</div>
</div>
<div class="factory-node factory-box">
<div style="font-size:0.7rem;margin-bottom:2px">FACTORY</div>
<div>ShapeFactory</div>
</div>
<div class="arch-arrow unidirectional" style="min-width:40px">
<div class="arr-line"></div>
<div class="arr-label">생성</div>
</div>
<div class="factory-node product" id="factoryProduct">
<div style="font-size:0.7rem;margin-bottom:2px;color:var(--accent)">PRODUCT</div>
<div id="factoryProductName">Circle</div>
</div>
</div>
<!-- Shape canvas -->
<div class="shape-canvas" id="shapeCanvas">
<svg id="shapeSVG" width="120" height="120" viewBox="0 0 120 120"></svg>
</div>
<!-- Object properties -->
<div class="shape-info-row">
<div class="shape-info-card">
<div class="card-label">OBJECT TYPE</div>
<div style="font-family:'JetBrains Mono',monospace;font-size:0.85rem;color:var(--accent3)" id="shapeType">Circle</div>
</div>
<div class="shape-info-card">
<div class="card-label">PROPERTIES</div>
<div style="font-family:'JetBrains Mono',monospace;font-size:0.78rem;color:var(--text-dim)" id="shapeProps">radius: 50, area: 7854</div>
</div>
<div class="shape-info-card">
<div class="card-label">METHOD</div>
<div style="font-family:'JetBrains Mono',monospace;font-size:0.78rem;color:var(--accent4)" id="shapeMethod">draw(), resize(n)</div>
</div>
<div class="shape-info-card">
<div class="card-label">INTERFACE</div>
<div style="font-family:'JetBrains Mono',monospace;font-size:0.78rem;color:var(--accent2)">Shape (공통)</div>
</div>
</div>
<!-- Factory Method vs Abstract Factory -->
<div style="margin-top:20px;display:grid;grid-template-columns:1fr 1fr;gap:14px;">
<div style="background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:14px">
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--accent3);letter-spacing:1px;margin-bottom:8px">FACTORY METHOD</div>
<div style="font-size:0.83rem;line-height:1.8;color:var(--text-dim)">
서브클래스가 생성할 객체의 클래스를 결정.<br>
하나의 제품 계층을 다룸.<br>
<span style="color:var(--text)">예: Logger, Parser 생성</span>
</div>
</div>
<div style="background:var(--surface2);border:1px solid var(--border);border-radius:10px;padding:14px">
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--accent2);letter-spacing:1px;margin-bottom:8px">ABSTRACT FACTORY</div>
<div style="font-size:0.83rem;line-height:1.8;color:var(--text-dim)">
관련된 객체 <em>군(族)</em>을 함께 생성.<br>
여러 제품 계층을 다룸.<br>
<span style="color:var(--text)">예: UI 컴포넌트 키트(Button+Input+Modal)</span>
</div>
</div>
</div>
<!-- Code -->
<div style="margin-top:16px;font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);letter-spacing:1px;margin-bottom:8px">FACTORY IMPLEMENTATION (TypeScript)</div>
<div class="code-block"><span class="kw">interface</span> <span class="cls">Shape</span> {
<span class="fn">draw</span>(): <span class="cls">void</span>;
<span class="fn">area</span>(): <span class="cls">number</span>;
}
<span class="kw">class</span> <span class="cls">ShapeFactory</span> {
<span class="kw">static</span> <span class="fn">create</span>(type: <span class="cls">string</span>): <span class="cls">Shape</span> {
<span class="kw">switch</span> (type) {
<span class="kw">case</span> <span class="str">'circle'</span>: <span class="kw">return new</span> <span class="cls">Circle</span>();
<span class="kw">case</span> <span class="str">'rect'</span>: <span class="kw">return new</span> <span class="cls">Rectangle</span>();
<span class="kw">case</span> <span class="str">'triangle'</span>: <span class="kw">return new</span> <span class="cls">Triangle</span>();
<span class="kw">default</span>: <span class="kw">throw new</span> <span class="cls">Error</span>(<span class="str">`Unknown shape: ${type}`</span>);
}
}
}
<span class="cm">// 클라이언트 코드 — 구체 클래스를 전혀 모름</span>
<span class="kw">const</span> shape = <span class="cls">ShapeFactory</span>.<span class="fn">create</span>(<span class="str">'circle'</span>);
shape.<span class="fn">draw</span>(); <span class="cm">// Circle이든 Rectangle이든 동일 인터페이스 사용</span></div>
</div>
</section>
<div class="section-divider"></div>
<!-- ══════════════════════════════════════════════
SECTION 3 — 옵저버 패턴
══════════════════════════════════════════════ -->
<section id="observer">
<div class="section-header">
<div class="tag tag-ch12">03 — OBSERVER PATTERN</div>
<h2>옵저버 패턴</h2>
<p>객체 간의 <strong>일대다(1:N) 의존 관계</strong>를 정의합니다. 퍼블리셔(Publisher)의 상태가 변경되면, 구독 중인 모든 서브스크라이버(Subscriber)에게 자동으로 통지됩니다.</p>
</div>
<div class="viz-box">
<div class="observer-layout">
<!-- Publisher -->
<div class="publisher-box">
<div class="pub-title">PUBLISHER</div>
<div class="pub-name">📺 CS Visualizer 채널</div>
<div style="font-size:0.8rem;color:var(--text-dim);margin-bottom:14px">구독자 수: <span id="subCount" style="color:var(--accent2);font-weight:700">3</span>명</div>
<button class="btn" style="width:100%;background:rgba(255,107,157,0.15);border-color:var(--accent2);color:var(--accent2)" onclick="broadcastEvent()">
📢 이벤트 발생
</button>
<div style="margin-top:10px;font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim)" id="pubEventCount">발송된 이벤트: 0</div>
</div>
<!-- Arrows -->
<div class="observer-arrows" id="obsArrows">
<div>→</div>
<div>→</div>
<div>→</div>
</div>
<!-- Subscribers -->
<div class="subscribers-col">
<div class="subscriber-item" id="sub0">
<div class="sub-icon" style="background:rgba(0,255,170,0.15);color:var(--accent)">👤</div>
<div class="flex-col" style="gap:1px">
<div class="sub-name">UserA (React 개발자)</div>
<div class="sub-status" id="sub0status">대기 중...</div>
</div>
<button onclick="toggleSubscriber(0)" style="background:transparent;border:1px solid var(--border);border-radius:6px;padding:3px 8px;font-family:'JetBrains Mono',monospace;font-size:0.7rem;color:var(--text-dim);cursor:pointer" id="sub0btn">구독 취소</button>
</div>
<div class="subscriber-item" id="sub1">
<div class="sub-icon" style="background:rgba(107,138,255,0.15);color:var(--accent3)">👤</div>
<div class="flex-col" style="gap:1px">
<div class="sub-name">UserB (백엔드 개발자)</div>
<div class="sub-status" id="sub1status">대기 중...</div>
</div>
<button onclick="toggleSubscriber(1)" style="background:transparent;border:1px solid var(--border);border-radius:6px;padding:3px 8px;font-family:'JetBrains Mono',monospace;font-size:0.7rem;color:var(--text-dim);cursor:pointer" id="sub1btn">구독 취소</button>
</div>
<div class="subscriber-item" id="sub2">
<div class="sub-icon" style="background:rgba(255,170,0,0.15);color:var(--accent4)">👤</div>
<div class="flex-col" style="gap:1px">
<div class="sub-name">UserC (CS 학생)</div>
<div class="sub-status" id="sub2status">대기 중...</div>
</div>
<button onclick="toggleSubscriber(2)" style="background:transparent;border:1px solid var(--border);border-radius:6px;padding:3px 8px;font-family:'JetBrains Mono',monospace;font-size:0.7rem;color:var(--text-dim);cursor:pointer" id="sub2btn">구독 취소</button>
</div>
</div>
</div>
<!-- Event log -->
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);letter-spacing:1px;margin:14px 0 6px">EVENT LOG</div>
<div class="obs-log" id="obsLog">
<div style="color:var(--text-dim);font-style:italic">// 이벤트를 발생시키면 구독자들에게 통지됩니다...</div>
</div>
<!-- Real-world examples -->
<div class="info-text" style="margin-top:16px">
<strong style="color:#8b5cf6">실세계 적용 사례:</strong>
<div style="margin-top:8px;display:flex;gap:12px;flex-wrap:wrap">
<div style="font-size:0.83rem"><span style="color:var(--accent2)">YouTube 구독</span> — Channel(Publisher) + User(Subscriber)</div>
<div style="font-size:0.83rem"><span style="color:var(--accent3)">React useState</span> — state 변경 → 컴포넌트 리렌더링</div>
<div style="font-size:0.83rem"><span style="color:var(--accent4)">DOM Events</span> — element.addEventListener()</div>
<div style="font-size:0.83rem"><span style="color:var(--accent)">Node.js EventEmitter</span> — emitter.on() / emitter.emit()</div>
</div>
</div>
</div>
</section>
<div class="section-divider"></div>
<!-- ══════════════════════════════════════════════
SECTION 4 — 전략 패턴
══════════════════════════════════════════════ -->
<section id="strategy">
<div class="section-header">
<div class="tag tag-ch12">04 — STRATEGY PATTERN</div>
<h2>전략 패턴</h2>
<p>알고리즘의 군(族)을 정의하고 각각을 캡슐화하여 <strong>런타임에 교환 가능</strong>하게 만드는 패턴입니다. 조건문 분기를 없애고 동작을 유연하게 변경할 수 있습니다.</p>
</div>
<div class="viz-box">
<!-- Context -->
<div class="context-box">
<div>
<div class="context-label">CONTEXT</div>
<div style="font-family:'JetBrains Mono',monospace;font-size:1rem;font-weight:600">PaymentContext</div>
</div>
<div style="width:1px;height:40px;background:var(--border)"></div>
<div style="flex:1">
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);margin-bottom:2px">현재 전략</div>
<div style="font-family:'JetBrains Mono',monospace;font-size:0.88rem;color:var(--accent4)" id="currentStrategy">전략을 선택하세요</div>
</div>
<div>
<button class="btn" onclick="executePayment()" id="payBtn" disabled style="opacity:0.5">결제 실행</button>
</div>
</div>
<!-- Strategy cards -->
<div class="strategy-grid">
<div class="strategy-card" id="sc-credit" onclick="selectStrategy('credit')">
<div class="strategy-icon">💳</div>
<div class="strategy-name">CreditCard</div>
<div class="strategy-desc">신용카드 결제<br>3D Secure 인증</div>
</div>
<div class="strategy-card" id="sc-kakao" onclick="selectStrategy('kakao')">
<div class="strategy-icon">💛</div>
<div class="strategy-name">KakaoPay</div>
<div class="strategy-desc">카카오페이 결제<br>간편 인증</div>
</div>
<div class="strategy-card" id="sc-naver" onclick="selectStrategy('naver')">
<div class="strategy-icon">🟢</div>
<div class="strategy-name">NaverPay</div>
<div class="strategy-desc">네이버페이 결제<br>포인트 사용 가능</div>
</div>
</div>
<!-- Payment flow -->
<div style="font-family:'JetBrains Mono',monospace;font-size:0.72rem;color:var(--text-dim);letter-spacing:1px;margin-bottom:8px">PAYMENT FLOW</div>
<div class="payment-flow" id="paymentFlow">
<div style="font-family:'JetBrains Mono',monospace;font-size:0.82rem;color:var(--text-dim);padding:20px 0;text-align:center">전략을 선택하고 "결제 실행"을 누르세요</div>
</div>
<!-- Code compare -->
<div class="code-compare">
<div>
<div class="compare-col-label bad-label">BAD: if/else 분기</div>
<div class="code-block" style="font-size:0.74rem"><span class="kw">function</span> <span class="fn">pay</span>(method, amount) {
<span class="kw">if</span> (method === <span class="str">'credit'</span>) {
<span class="cm">// 신용카드 로직...</span>
validate3DSecure();
chargeCard(amount);
} <span class="kw">else if</span> (method === <span class="str">'kakao'</span>) {
<span class="cm">// 카카오 로직...</span>
requestKakaoAuth();
deductKakao(amount);
} <span class="kw">else if</span> (method === <span class="str">'naver'</span>) {
<span class="cm">// 네이버 로직...</span>
checkNaverPoints();
deductNaver(amount);
}
<span class="cm">// 새 결제수단 추가 → 코드 수정 필요!</span>
}</div>
</div>
<div>
<div class="compare-col-label good-label">GOOD: 전략 패턴</div>
<div class="code-block" style="font-size:0.74rem"><span class="kw">interface</span> <span class="cls">PayStrategy</span> {
<span class="fn">pay</span>(amount: <span class="cls">number</span>): <span class="cls">void</span>;
}
<span class="kw">class</span> <span class="cls">PaymentContext</span> {
<span class="kw">private</span> strategy: <span class="cls">PayStrategy</span>;
<span class="fn">setStrategy</span>(s: <span class="cls">PayStrategy</span>) {
<span class="kw">this</span>.strategy = s;
}
<span class="fn">execute</span>(amount: <span class="cls">number</span>) {
<span class="kw">this</span>.strategy.<span class="fn">pay</span>(amount);
}
}
<span class="cm">// 새 전략 추가 → 클래스만 추가!</span>