sanbuphy
d35211071a
- standardize border-radius from 8px to 6px for consistent styling - adjust padding values from 1rem to 0.75rem for better visual hierarchy - remove redundant overflow-y properties for cleaner code
809 lines
19 KiB
Vue
809 lines
19 KiB
Vue
<!--
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CachePatternsDemo.vue
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缓存模式演示 - Cache-Aside, Read-Through, Write-Behind
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-->
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<template>
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<div class="cache-patterns-demo">
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<div class="header">
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<div class="title">缓存模式 (Caching Patterns)</div>
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<div class="subtitle">理解不同缓存读写模式的工作原理</div>
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</div>
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<div class="pattern-selector">
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<button
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v-for="pattern in patterns"
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:key="pattern.id"
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class="pattern-btn"
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:class="{ active: activePattern === pattern.id }"
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@click="activePattern = pattern.id"
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>
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{{ pattern.name }}
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</button>
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</div>
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<div class="pattern-content">
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<!-- Cache-Aside -->
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<div v-if="activePattern === 'cache-aside'" class="pattern-detail">
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<div class="description">
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<div class="pattern-title">Cache-Aside (旁路缓存)</div>
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<div class="pattern-subtitle">最常用的模式，由应用代码控制缓存</div>
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<div class="pattern-points">
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<div class="point">
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<span class="icon">📖</span>
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<div>
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<strong>读取</strong>：先查缓存，没命中再查数据库，然后写入缓存
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</div>
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</div>
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<div class="point">
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<span class="icon">✏️</span>
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<div>
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<strong>更新</strong
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>：先更新数据库，然后<strong>删除</strong>缓存（不是更新！）
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</div>
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</div>
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</div>
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</div>
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<div class="diagram">
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<div class="diagram-title">读取流程</div>
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<div class="flow-chart">
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<div class="flow-step" :class="{ active: flowStep >= 1 }">
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<div class="step-number">1</div>
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<div class="step-text">查询缓存</div>
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</div>
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<div class="flow-arrow">↓</div>
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<div class="flow-decision">
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<div class="decision-label">命中?</div>
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<div class="decision-branches">
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<div
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class="branch yes"
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:class="{ active: flowStep >= 2 && cacheHit }"
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>
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<div class="branch-label">是</div>
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<div class="branch-result">✅ 返回数据</div>
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</div>
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<div
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class="branch no"
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:class="{ active: flowStep >= 2 && !cacheHit }"
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>
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<div class="branch-label">否</div>
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<div class="branch-steps">
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<div class="flow-step" :class="{ active: flowStep >= 3 }">
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<div class="step-number">2</div>
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<div class="step-text">查询数据库</div>
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</div>
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<div class="flow-arrow">↓</div>
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<div class="flow-step" :class="{ active: flowStep >= 4 }">
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<div class="step-number">3</div>
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<div class="step-text">写入缓存</div>
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</div>
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<div class="flow-arrow">↓</div>
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<div class="flow-step" :class="{ active: flowStep >= 5 }">
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<div class="step-number">4</div>
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<div class="step-text">返回数据</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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</div>
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<div class="demo-controls">
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<button
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class="demo-btn"
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@click="simulateCacheAside"
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:disabled="simulating"
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>
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{{ simulating ? '模拟中...' : '模拟读取' }}
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</button>
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<label class="checkbox">
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<input type="checkbox" v-model="cacheHit" />
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缓存命中
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</label>
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</div>
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</div>
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<div class="code-example">
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<div class="code-title">代码示例</div>
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<pre class="code-block"><code>// Cache-Aside 模式
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def get_user(user_id):
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# 1. 查缓存
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user = cache.get(f'user:{user_id}')
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if user:
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return user # 命中，直接返回
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# 2. 查数据库
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user = db.query(f'SELECT * FROM users WHERE id = {user_id}')
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# 3. 写入缓存
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cache.set(f'user:{user_id}', user, ttl=600)
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return user
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def update_user(user_id, data):
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# 1. 更新数据库
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db.update('users', data)
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# 2. 删除缓存（不是更新！）
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cache.delete(f'user:{user_id}')</code></pre>
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</div>
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</div>
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<!-- Read-Through -->
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<div v-if="activePattern === 'read-through'" class="pattern-detail">
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<div class="description">
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<div class="pattern-title">Read-Through / Write-Through</div>
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<div class="pattern-subtitle">
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由缓存库负责与数据库交互，应用只和缓存打交道
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</div>
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<div class="pattern-points">
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<div class="point">
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<span class="icon">📖</span>
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<div>
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<strong>Read-Through</strong>：缓存库自动从数据库加载数据
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</div>
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</div>
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<div class="point">
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<span class="icon">✏️</span>
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<div>
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<strong>Write-Through</strong>：写入缓存时同步写入数据库
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</div>
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</div>
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</div>
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</div>
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<div class="diagram">
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<div class="diagram-title">架构对比</div>
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<div class="architecture-comparison">
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<div class="arch-block">
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<div class="arch-title">Cache-Aside</div>
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<div class="arch-flow">
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<div class="flow-box app">应用</div>
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<div class="flow-arrows">
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<div>↔️ 缓存</div>
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<div>↔️ 数据库</div>
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</div>
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</div>
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</div>
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<div class="arch-block">
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<div class="arch-title">Read-Through</div>
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<div class="arch-flow">
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<div class="flow-box app">应用</div>
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<div class="flow-arrows">
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<div>↔️ 缓存库</div>
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</div>
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<div class="flow-box cache">缓存库 ↔️ 数据库</div>
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</div>
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</div>
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</div>
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</div>
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<div class="code-example">
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<div class="code-title">代码示例</div>
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<pre class="code-block"><code>// Read-Through 模式（代码更简洁）
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def get_user(user_id):
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# 缓存库自动处理数据库查询
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user = cache.get_or_load(user_id, lambda: db.get_user(user_id))
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return user
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// Write-Through 模式
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def update_user(user_id, data):
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# 缓存库自动同步到数据库
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cache.set(user_id, data) # 自动写入数据库</code></pre>
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</div>
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</div>
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<!-- Write-Behind -->
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<div v-if="activePattern === 'write-behind'" class="pattern-detail">
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<div class="description">
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<div class="pattern-title">Write-Behind (异步写回)</div>
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<div class="pattern-subtitle">写入时只写缓存，异步批量写数据库</div>
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<div class="pattern-points">
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<div class="point">
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<span class="icon">⚡</span>
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<div><strong>优点</strong>：写入极快，适合写多的场景</div>
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</div>
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<div class="point">
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<span class="icon">⚠️</span>
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<div>
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<strong>缺点</strong>：数据可能丢失（缓存崩了，数据就没了）
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</div>
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</div>
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<div class="point">
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<span class="icon">🎯</span>
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<div>
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<strong>适用</strong
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>：秒杀系统、点赞数、浏览量（可接受少量丢失）
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</div>
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</div>
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</div>
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</div>
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<div class="diagram">
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<div class="diagram-title">写入流程</div>
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<div class="flow-chart">
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<div class="flow-step">
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<div class="step-number">1</div>
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<div class="step-text">写入缓存</div>
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<div class="step-time">⚡ ~1ms</div>
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</div>
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<div class="flow-arrow">↓</div>
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<div class="flow-step">
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<div class="step-number">2</div>
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<div class="step-text">立即返回</div>
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</div>
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<div class="flow-arrow">↓</div>
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<div class="flow-step pending">
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<div class="step-number">3</div>
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<div class="step-text">异步批量写数据库</div>
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<div class="step-time">🕐 后台执行</div>
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</div>
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</div>
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<div class="demo-controls">
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<button class="demo-btn" @click="simulateWriteBehind">
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模拟批量写入
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</button>
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</div>
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<div class="write-queue" v-if="writeQueue.length > 0">
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<div class="queue-title">待写入队列</div>
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<div class="queue-items">
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<div
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v-for="(item, index) in writeQueue"
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:key="index"
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class="queue-item"
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:class="{ writing: item.writing, written: item.written }"
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>
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<span class="item-key">{{ item.key }}</span>
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<span class="item-status">{{ item.status }}</span>
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</div>
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</div>
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</div>
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</div>
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<div class="code-example">
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<div class="code-title">代码示例</div>
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<pre class="code-block"><code>// Write-Behind 模式
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def update_counter(post_id):
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# 1. 立即更新缓存（极快）
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cache.incr(f'views:{post_id}')
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# 立即返回，不等待数据库
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# 2. 后台异步批量写入数据库
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async def flush_to_db():
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while True:
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await asyncio.sleep(5) # 每5秒批量写入
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batch = cache.get_many('views:*')
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db.batch_update(batch)
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asyncio.create_task(flush_to_db())</code></pre>
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</div>
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</div>
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</div>
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<div class="pattern-comparison">
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<div class="comparison-title">模式对比</div>
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<table class="comparison-table">
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<thead>
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<tr>
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<th>模式</th>
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<th>复杂度</th>
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<th>性能</th>
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<th>一致性</th>
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<th>适用场景</th>
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</tr>
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</thead>
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<tbody>
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<tr :class="{ highlight: activePattern === 'cache-aside' }">
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<td>Cache-Aside</td>
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<td>中</td>
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<td>高</td>
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<td>中</td>
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<td>大多数场景</td>
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</tr>
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<tr :class="{ highlight: activePattern === 'read-through' }">
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<td>Read-Through</td>
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<td>低</td>
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<td>中</td>
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<td>高</td>
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<td>简单场景</td>
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</tr>
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<tr :class="{ highlight: activePattern === 'write-behind' }">
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<td>Write-Behind</td>
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<td>高</td>
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<td>极高</td>
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<td>低</td>
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<td>写多、可丢失</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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</template>
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<script setup>
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import { ref } from 'vue'
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const activePattern = ref('cache-aside')
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const flowStep = ref(0)
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const cacheHit = ref(false)
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const simulating = ref(false)
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const writeQueue = ref([])
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const patterns = [
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{ id: 'cache-aside', name: 'Cache-Aside' },
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{ id: 'read-through', name: 'Read-Through' },
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{ id: 'write-behind', name: 'Write-Behind' }
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]
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const simulateCacheAside = async () => {
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simulating.value = true
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flowStep.value = 0
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const steps = cacheHit.value ? [1, 2] : [1, 2, 3, 4, 5]
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for (let i = 0; i < steps.length; i++) {
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await new Promise((resolve) => setTimeout(resolve, 600))
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flowStep.value = steps[i]
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}
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setTimeout(() => {
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flowStep.value = 0
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simulating.value = false
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}, 1000)
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}
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const simulateWriteBehind = async () => {
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writeQueue.value = [
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{
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key: 'views:post:1',
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value: 100,
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status: '待写入',
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writing: false,
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written: false
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},
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{
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key: 'views:post:2',
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value: 200,
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status: '待写入',
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writing: false,
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written: false
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},
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{
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key: 'views:post:3',
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value: 150,
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status: '待写入',
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writing: false,
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written: false
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}
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]
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for (let i = 0; i < writeQueue.value.length; i++) {
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await new Promise((resolve) => setTimeout(resolve, 800))
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writeQueue.value[i].writing = true
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writeQueue.value[i].status = '写入中...'
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await new Promise((resolve) => setTimeout(resolve, 700))
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writeQueue.value[i].writing = false
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writeQueue.value[i].written = true
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writeQueue.value[i].status = '✅ 已写入'
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}
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}
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</script>
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<style scoped>
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.cache-patterns-demo {
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border: 1px solid var(--vp-c-divider);
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background: var(--vp-c-bg-soft);
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border-radius: 12px;
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padding: 1.5rem;
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margin: 1.5rem 0;
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font-family: var(--vp-font-family-base);
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}
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.header {
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margin-bottom: 1.5rem;
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}
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.title {
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font-weight: 700;
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font-size: 1.1rem;
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}
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.subtitle {
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color: var(--vp-c-text-2);
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font-size: 0.9rem;
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}
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.pattern-selector {
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display: flex;
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gap: 0.5rem;
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margin-bottom: 2rem;
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flex-wrap: wrap;
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}
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.pattern-btn {
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padding: 0.75rem 1.5rem;
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background: var(--vp-c-bg);
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border: 2px solid var(--vp-c-divider);
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border-radius: 6px;
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cursor: pointer;
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font-weight: 600;
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transition: all 0.2s;
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}
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.pattern-btn.active {
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background: var(--vp-c-brand);
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color: white;
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border-color: var(--vp-c-brand);
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}
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.pattern-content {
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min-height: 400px;
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}
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.pattern-detail {
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display: flex;
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flex-direction: column;
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gap: 2rem;
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}
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.description {
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background: var(--vp-c-bg);
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padding: 1.5rem;
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border-radius: 10px;
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border: 1px solid var(--vp-c-divider);
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}
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.pattern-title {
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font-size: 1.2rem;
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font-weight: 700;
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margin-bottom: 0.5rem;
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}
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.pattern-subtitle {
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color: var(--vp-c-text-2);
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margin-bottom: 1rem;
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}
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.pattern-points {
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display: flex;
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flex-direction: column;
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gap: 1rem;
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}
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.point {
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display: flex;
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gap: 1rem;
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align-items: flex-start;
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}
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.icon {
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font-size: 1.5rem;
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flex-shrink: 0;
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}
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.diagram {
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background: var(--vp-c-bg);
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padding: 1.5rem;
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border-radius: 10px;
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border: 1px solid var(--vp-c-divider);
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}
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.diagram-title {
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font-weight: 600;
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margin-bottom: 1rem;
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font-size: 0.95rem;
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}
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.flow-chart {
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display: flex;
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flex-direction: column;
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align-items: center;
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gap: 0.5rem;
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margin-bottom: 1.5rem;
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}
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.flow-step {
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display: flex;
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align-items: center;
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gap: 1rem;
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padding: 0.75rem 1.5rem;
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background: var(--vp-c-bg-soft);
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border-radius: 6px;
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border: 2px solid var(--vp-c-divider);
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transition: all 0.3s;
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}
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.flow-step.active {
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border-color: var(--vp-c-brand);
|
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background: #eff6ff;
|
||
}
|
||
|
||
.flow-step.pending {
|
||
border-color: #f59e0b;
|
||
background: #fef3c7;
|
||
}
|
||
|
||
.step-number {
|
||
width: 30px;
|
||
height: 30px;
|
||
display: flex;
|
||
align-items: center;
|
||
justify-content: center;
|
||
background: var(--vp-c-brand);
|
||
color: white;
|
||
border-radius: 50%;
|
||
font-weight: 700;
|
||
font-size: 0.85rem;
|
||
}
|
||
|
||
.step-text {
|
||
font-weight: 600;
|
||
font-size: 0.9rem;
|
||
}
|
||
|
||
.step-time {
|
||
font-size: 0.8rem;
|
||
color: var(--vp-c-text-2);
|
||
}
|
||
|
||
.flow-arrow {
|
||
font-size: 1.5rem;
|
||
color: var(--vp-c-text-2);
|
||
}
|
||
|
||
.flow-decision {
|
||
display: flex;
|
||
flex-direction: column;
|
||
align-items: center;
|
||
gap: 1rem;
|
||
}
|
||
|
||
.decision-label {
|
||
font-weight: 600;
|
||
padding: 0.5rem 1rem;
|
||
background: #fef3c7;
|
||
border-radius: 6px;
|
||
border: 1px solid #f59e0b;
|
||
}
|
||
|
||
.decision-branches {
|
||
display: grid;
|
||
grid-template-columns: 1fr 1fr;
|
||
gap: 1rem;
|
||
}
|
||
|
||
.branch {
|
||
padding: 0.75rem;
|
||
border-radius: 6px;
|
||
border: 2px solid var(--vp-c-divider);
|
||
transition: all 0.3s;
|
||
}
|
||
|
||
.branch.active {
|
||
border-color: var(--vp-c-brand);
|
||
background: #eff6ff;
|
||
}
|
||
|
||
.branch-label {
|
||
font-weight: 600;
|
||
margin-bottom: 0.5rem;
|
||
text-align: center;
|
||
}
|
||
|
||
.branch-result {
|
||
text-align: center;
|
||
padding: 0.5rem;
|
||
background: #f0fdf4;
|
||
border-radius: 6px;
|
||
color: #166534;
|
||
font-weight: 600;
|
||
}
|
||
|
||
.branch-steps {
|
||
display: flex;
|
||
flex-direction: column;
|
||
align-items: center;
|
||
gap: 0.5rem;
|
||
}
|
||
|
||
.demo-controls {
|
||
display: flex;
|
||
align-items: center;
|
||
gap: 1rem;
|
||
margin-bottom: 1rem;
|
||
}
|
||
|
||
.demo-btn {
|
||
padding: 0.75rem 1.5rem;
|
||
background: var(--vp-c-brand);
|
||
color: white;
|
||
border: none;
|
||
border-radius: 6px;
|
||
cursor: pointer;
|
||
font-weight: 600;
|
||
transition: all 0.2s;
|
||
}
|
||
|
||
.demo-btn:hover:not(:disabled) {
|
||
transform: translateY(-2px);
|
||
box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
|
||
}
|
||
|
||
.demo-btn:disabled {
|
||
opacity: 0.6;
|
||
cursor: not-allowed;
|
||
}
|
||
|
||
.checkbox {
|
||
display: flex;
|
||
align-items: center;
|
||
gap: 0.5rem;
|
||
font-size: 0.9rem;
|
||
cursor: pointer;
|
||
}
|
||
|
||
.architecture-comparison {
|
||
display: grid;
|
||
grid-template-columns: 1fr 1fr;
|
||
gap: 2rem;
|
||
}
|
||
|
||
@media (max-width: 640px) {
|
||
.architecture-comparison {
|
||
grid-template-columns: 1fr;
|
||
}
|
||
}
|
||
|
||
.arch-block {
|
||
padding: 0.75rem;
|
||
background: var(--vp-c-bg-soft);
|
||
border-radius: 6px;
|
||
}
|
||
|
||
.arch-title {
|
||
font-weight: 600;
|
||
margin-bottom: 1rem;
|
||
text-align: center;
|
||
}
|
||
|
||
.arch-flow {
|
||
display: flex;
|
||
flex-direction: column;
|
||
align-items: center;
|
||
gap: 0.75rem;
|
||
}
|
||
|
||
.flow-box {
|
||
padding: 0.75rem 1.5rem;
|
||
background: white;
|
||
border-radius: 6px;
|
||
border: 2px solid var(--vp-c-divider);
|
||
font-weight: 600;
|
||
}
|
||
|
||
.flow-box.cache {
|
||
font-size: 0.85rem;
|
||
}
|
||
|
||
.flow-arrows {
|
||
display: flex;
|
||
flex-direction: column;
|
||
align-items: center;
|
||
gap: 0.5rem;
|
||
font-size: 0.85rem;
|
||
color: var(--vp-c-text-2);
|
||
}
|
||
|
||
.write-queue {
|
||
margin-top: 1rem;
|
||
}
|
||
|
||
.queue-title {
|
||
font-weight: 600;
|
||
margin-bottom: 0.75rem;
|
||
font-size: 0.9rem;
|
||
}
|
||
|
||
.queue-items {
|
||
display: flex;
|
||
flex-direction: column;
|
||
gap: 0.5rem;
|
||
}
|
||
|
||
.queue-item {
|
||
display: flex;
|
||
justify-content: space-between;
|
||
align-items: center;
|
||
padding: 0.75rem;
|
||
background: var(--vp-c-bg-soft);
|
||
border-radius: 6px;
|
||
border: 1px solid var(--vp-c-divider);
|
||
transition: all 0.3s;
|
||
}
|
||
|
||
.queue-item.writing {
|
||
border-color: #f59e0b;
|
||
background: #fef3c7;
|
||
}
|
||
|
||
.queue-item.written {
|
||
border-color: #22c55e;
|
||
background: #f0fdf4;
|
||
}
|
||
|
||
.item-key {
|
||
font-weight: 600;
|
||
font-size: 0.85rem;
|
||
}
|
||
|
||
.item-status {
|
||
font-size: 0.8rem;
|
||
}
|
||
|
||
.code-example {
|
||
background: var(--vp-c-bg);
|
||
padding: 1.5rem;
|
||
border-radius: 10px;
|
||
border: 1px solid var(--vp-c-divider);
|
||
}
|
||
|
||
.code-title {
|
||
font-weight: 600;
|
||
margin-bottom: 1rem;
|
||
font-size: 0.95rem;
|
||
}
|
||
|
||
.code-block {
|
||
background: #1e293b;
|
||
color: #e2e8f0;
|
||
padding: 0.75rem;
|
||
border-radius: 6px;
|
||
overflow-x: auto;
|
||
font-size: 0.85rem;
|
||
line-height: 1.6;
|
||
}
|
||
|
||
.pattern-comparison {
|
||
background: var(--vp-c-bg);
|
||
padding: 1.5rem;
|
||
border-radius: 10px;
|
||
border: 1px solid var(--vp-c-divider);
|
||
}
|
||
|
||
.comparison-title {
|
||
font-weight: 600;
|
||
margin-bottom: 1rem;
|
||
font-size: 0.95rem;
|
||
}
|
||
|
||
.comparison-table {
|
||
width: 100%;
|
||
border-collapse: collapse;
|
||
}
|
||
|
||
.comparison-table th,
|
||
.comparison-table td {
|
||
padding: 0.75rem;
|
||
text-align: center;
|
||
border: 1px solid var(--vp-c-divider);
|
||
}
|
||
|
||
.comparison-table th {
|
||
background: var(--vp-c-bg-soft);
|
||
font-weight: 600;
|
||
font-size: 0.85rem;
|
||
}
|
||
|
||
.comparison-table td {
|
||
font-size: 0.85rem;
|
||
}
|
||
|
||
.comparison-table tr.highlight {
|
||
background: #eff6ff;
|
||
border-left: 3px solid var(--vp-c-brand);
|
||
}
|
||
</style>
|