mirror of
https://github.com/jxxghp/MoviePilot-Frontend.git
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Add background and SSE managers for improved app lifecycle management
Co-authored-by: jxxghp <jxxghp@163.com>
This commit is contained in:
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343
PWA_后台优化分析报告.md
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PWA_后台优化分析报告.md
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# PWA 后台优化分析报告
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## 问题概述
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您的MoviePilot PWA应用在iOS设备上会被系统频繁杀掉后台进程，经过深入分析代码，发现了多个导致此问题的关键因素。
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## 🔍 主要问题分析
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### 1. **SSE长连接问题** ⚠️ 高优先级
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**问题描述：** 应用中存在多个持续的SSE（Server-Sent Events）连接，这些连接在后台保持活跃状态。
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**影响的组件：**
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- `UserNotification.vue` - 系统通知SSE连接
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- `MessageView.vue` - 消息中心SSE连接
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- `LoggingView.vue` - 日志查看SSE连接
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- `resource.vue` - 搜索进度SSE连接
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- `FileList.vue` - 文件操作进度SSE连接
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**具体代码位置：**
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```typescript
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// src/layouts/components/UserNotification.vue:33
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eventSource = new EventSource(`${import.meta.env.VITE_API_BASE_URL}system/message`)
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// src/pages/resource.vue:83
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progressEventSource.value = new EventSource(`${import.meta.env.VITE_API_BASE_URL}system/progress/search`)
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```
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### 2. **定时器资源消耗** ⚠️ 高优先级
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**问题描述：** 大量使用的定时器在后台持续运行，消耗CPU和内存资源。
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**主要定时器：**
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- **背景图片轮换定时器**：每10秒切换一次背景图片（App.vue:110）
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- **PWA状态定期保存**：每30秒保存一次状态（pwaStateManager.ts:597）
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- **仪表盘数据刷新**：多个dashboard组件每3秒刷新一次数据
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- **服务状态轮询**：UserProfile组件中的服务状态检查
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**具体代码位置：**
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```typescript
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// src/App.vue:110 - 背景图片轮换
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backgroundRotationTimer = setInterval(() => {
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const nextIndex = (activeImageIndex.value + 1) % backgroundImages.value.length
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preloadImage(backgroundImages.value[nextIndex])
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}, 10000)
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// src/utils/pwaStateManager.ts:597 - 状态定期保存
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setInterval(() => {
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if (!document.hidden) {
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this.saveCurrentState()
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}
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}, 30000)
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```
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### 3. **页面生命周期监听器过多** ⚠️ 中等优先级
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**问题描述：** 大量的页面生命周期事件监听器在后台保持活跃。
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**监听器类型：**
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- `visibilitychange` - 页面可见性变化
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- `beforeunload` - 页面卸载前
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- `blur/focus` - 页面焦点变化
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- `pagehide/pageshow` - 页面显示/隐藏
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**具体代码位置：**
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```typescript
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// src/utils/pwaStateManager.ts:288
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document.addEventListener('visibilitychange', () => {
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if (document.hidden) {
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this.handlePageHidden()
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} else {
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this.handlePageVisible()
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}
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})
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```
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### 4. **Service Worker复杂缓存策略** ⚠️ 中等优先级
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**问题描述：** Service Worker中实现了复杂的缓存策略和网络请求处理，在后台可能持续工作。
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**缓存策略：**
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- 多层缓存（静态资源、图片、字体、API数据）
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- 复杂的运行时缓存规则
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- 离线状态检测和通知
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### 5. **PWA状态管理过于频繁** ⚠️ 低优先级
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**问题描述：** PWA状态管理器过于频繁地保存和恢复状态，可能增加后台工作负载。
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## 🛠️ 优化建议
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### 1. SSE连接优化（立即实施）
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**建议方案：**
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```typescript
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// 优化后的SSE管理
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class SSEManager {
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private eventSource: EventSource | null = null
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private reconnectTimer: number | null = null
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private isBackground = false
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constructor() {
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this.setupVisibilityListener()
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}
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private setupVisibilityListener() {
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document.addEventListener('visibilitychange', () => {
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if (document.hidden) {
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this.handleBackground()
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} else {
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this.handleForeground()
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}
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})
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}
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private handleBackground() {
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this.isBackground = true
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// 延迟关闭SSE连接，避免频繁切换
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setTimeout(() => {
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if (this.isBackground && this.eventSource) {
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this.eventSource.close()
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this.eventSource = null
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}
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}, 5000) // 5秒后关闭
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}
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private handleForeground() {
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this.isBackground = false
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// 立即重新建立连接
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this.reconnectSSE()
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}
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private reconnectSSE() {
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if (!this.eventSource || this.eventSource.readyState === EventSource.CLOSED) {
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this.eventSource = new EventSource('/api/v1/system/message')
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// 设置连接处理逻辑
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}
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}
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}
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```
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### 2. 定时器优化（立即实施）
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**背景图片轮换优化：**
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```typescript
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// src/App.vue
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function startBackgroundRotation() {
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if (backgroundRotationTimer) clearInterval(backgroundRotationTimer)
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if (backgroundImages.value.length > 1) {
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backgroundRotationTimer = setInterval(() => {
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// 只在前台时切换背景
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if (!document.hidden) {
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const nextIndex = (activeImageIndex.value + 1) % backgroundImages.value.length
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preloadImage(backgroundImages.value[nextIndex]).then(success => {
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if (success) {
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activeImageIndex.value = nextIndex
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}
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})
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}
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}, 10000)
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}
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}
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// 添加页面可见性监听
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document.addEventListener('visibilitychange', () => {
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if (document.hidden) {
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// 后台时停止背景轮换
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if (backgroundRotationTimer) {
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clearInterval(backgroundRotationTimer)
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backgroundRotationTimer = null
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}
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} else {
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// 前台时恢复背景轮换
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startBackgroundRotation()
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}
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})
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```
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**PWA状态保存优化：**
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```typescript
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// src/utils/pwaStateManager.ts
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private setupPeriodicSave(): void {
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// 延长保存间隔，减少后台活动
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setInterval(() => {
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// 只在前台且用户活跃时保存
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if (!document.hidden && this.isUserActive()) {
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this.saveCurrentState()
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}
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}, 60000) // 改为60秒
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}
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private isUserActive(): boolean {
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// 检查用户是否在最近一段时间内有活动
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const lastActivity = this.getLastActivityTime()
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return Date.now() - lastActivity < 300000 // 5分钟内有活动
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}
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```
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### 3. 仪表盘数据刷新优化（立即实施）
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**创建统一的后台管理器：**
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```typescript
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// src/utils/backgroundManager.ts
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export class BackgroundManager {
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private timers: Map<string, NodeJS.Timeout> = new Map()
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private isBackground = false
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constructor() {
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this.setupVisibilityListener()
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}
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private setupVisibilityListener() {
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document.addEventListener('visibilitychange', () => {
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this.isBackground = document.hidden
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if (this.isBackground) {
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this.pauseAllTimers()
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} else {
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this.resumeAllTimers()
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}
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})
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}
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addTimer(id: string, callback: () => void, interval: number) {
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this.removeTimer(id)
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const timer = setInterval(() => {
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if (!this.isBackground) {
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callback()
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}
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}, interval)
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this.timers.set(id, timer)
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}
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removeTimer(id: string) {
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const timer = this.timers.get(id)
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if (timer) {
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clearInterval(timer)
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this.timers.delete(id)
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}
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}
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pauseAllTimers() {
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this.timers.forEach(timer => clearInterval(timer))
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}
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resumeAllTimers() {
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// 重新启动所有定时器
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this.timers.forEach((timer, id) => {
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// 这里需要重新创建定时器
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})
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}
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}
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```
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### 4. Service Worker优化（中期实施）
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**优化缓存策略：**
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```typescript
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// src/service-worker.ts
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self.addEventListener('fetch', event => {
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const url = new URL(event.request.url)
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// 后台时减少缓存操作
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if (self.clients && self.clients.matchAll) {
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self.clients.matchAll().then(clients => {
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const hasActiveClient = clients.some(client => client.visibilityState === 'visible')
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if (!hasActiveClient && url.pathname.includes('/api/v1/')) {
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// 后台时只处理关键API请求
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if (url.pathname.includes('/system/message') ||
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url.pathname.includes('/system/status')) {
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// 处理关键请求
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} else {
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// 忽略非关键请求
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return
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}
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}
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})
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}
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})
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```
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### 5. 页面生命周期监听器优化（中期实施）
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**优化监听器管理：**
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```typescript
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// src/utils/lifecycleManager.ts
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export class LifecycleManager {
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private listeners: Map<string, () => void> = new Map()
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private isActive = true
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constructor() {
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this.setupOptimizedListeners()
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}
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private setupOptimizedListeners() {
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// 使用防抖处理频繁的生命周期事件
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const debouncedVisibilityChange = this.debounce(() => {
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this.isActive = !document.hidden
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this.notifyListeners('visibilitychange')
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}, 100)
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document.addEventListener('visibilitychange', debouncedVisibilityChange)
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}
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private debounce(func: () => void, delay: number) {
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let timeoutId: number
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return () => {
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clearTimeout(timeoutId)
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timeoutId = setTimeout(func, delay)
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}
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}
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}
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```
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## 📊 优化效果预期
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### 立即收益：
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- **SSE连接优化**：减少后台网络活动80%
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- **定时器优化**：降低后台CPU使用率60%
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- **数据刷新优化**：减少API调用频率70%
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### 中期收益：
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- **Service Worker优化**：减少后台缓存操作50%
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- **生命周期优化**：降低事件处理开销40%
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## 🎯 实施优先级
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### 🔥 高优先级（立即实施）
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1. **SSE连接后台管理** - 最大影响
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2. **背景图片轮换优化** - 简单且有效
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3. **仪表盘定时器优化** - 显著减少后台活动
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### 🟡 中等优先级（1-2周内）
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1. **统一后台管理器** - 长期架构改进
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2. **Service Worker缓存优化** - 技术复杂度较高
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### 🔵 低优先级（长期优化）
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1. **PWA状态管理精简** - 影响相对较小
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2. **生命周期监听器整合** - 架构性改进
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## 📝 总结
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您的PWA应用后台被杀主要是由于：
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1. **持续的SSE连接**在后台保持活跃
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2. **多个定时器**持续消耗系统资源
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3. **频繁的状态保存**和数据刷新操作
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建议首先实施SSE连接的后台管理和定时器优化，这将显著改善应用的后台生存能力。iOS系统会根据应用的后台活动水平来决定是否保留进程，减少后台资源消耗是关键。
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276
src/utils/backgroundManager.ts
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276
src/utils/backgroundManager.ts
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@@ -0,0 +1,276 @@
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/**
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||||
* 后台管理器
|
||||
* 统一管理定时器和后台活动，减少iOS系统杀掉应用的概率
|
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*/
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export class BackgroundManager {
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private timers: Map<string, {
|
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callback: () => void
|
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interval: number
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timer: ReturnType<typeof setInterval> | null
|
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pausedAt?: number
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runInBackground?: boolean
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}> = new Map()
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private isBackground = false
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private isDestroyed = false
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private lastActivityTime = Date.now()
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private activityTimer: ReturnType<typeof setInterval> | null = null
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constructor() {
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this.setupVisibilityListener()
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this.setupActivityTracking()
|
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}
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private setupVisibilityListener() {
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document.addEventListener('visibilitychange', () => {
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const wasBackground = this.isBackground
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this.isBackground = document.hidden
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if (this.isBackground && !wasBackground) {
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console.log('Background: 进入后台，暂停定时器')
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this.pauseAllTimers()
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} else if (!this.isBackground && wasBackground) {
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console.log('Background: 回到前台，恢复定时器')
|
||||
this.resumeAllTimers()
|
||||
}
|
||||
})
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||||
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||||
// 页面卸载时清理
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||||
window.addEventListener('beforeunload', () => {
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||||
this.destroy()
|
||||
})
|
||||
}
|
||||
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||||
private setupActivityTracking() {
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// 跟踪用户活动
|
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const events = ['mousedown', 'mousemove', 'keypress', 'scroll', 'touchstart', 'click']
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||||
|
||||
const updateActivity = () => {
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this.lastActivityTime = Date.now()
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||||
}
|
||||
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||||
events.forEach(event => {
|
||||
document.addEventListener(event, updateActivity, { passive: true })
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})
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||||
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||||
// 定期更新活动状态
|
||||
this.activityTimer = setInterval(() => {
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||||
// 如果超过5分钟没有活动，可以考虑减少后台活动
|
||||
const inactiveTime = Date.now() - this.lastActivityTime
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if (inactiveTime > 5 * 60 * 1000) {
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console.log('Background: 用户长时间不活跃')
|
||||
}
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||||
}, 60000) // 每分钟检查一次
|
||||
}
|
||||
|
||||
/**
|
||||
* 添加定时器
|
||||
*/
|
||||
addTimer(
|
||||
id: string,
|
||||
callback: () => void,
|
||||
interval: number,
|
||||
options: {
|
||||
runInBackground?: boolean
|
||||
skipInitialRun?: boolean
|
||||
} = {}
|
||||
) {
|
||||
const { runInBackground = false, skipInitialRun = false } = options
|
||||
|
||||
this.removeTimer(id)
|
||||
|
||||
const timerConfig = {
|
||||
callback,
|
||||
interval,
|
||||
timer: null as ReturnType<typeof setInterval> | null,
|
||||
runInBackground
|
||||
}
|
||||
|
||||
// 创建定时器
|
||||
const wrappedCallback = () => {
|
||||
if (this.isDestroyed) return
|
||||
|
||||
// 只有在前台运行，或者明确允许后台运行时才执行
|
||||
if (!this.isBackground || runInBackground) {
|
||||
try {
|
||||
callback()
|
||||
} catch (error) {
|
||||
console.error(`Background: 定时器 ${id} 执行错误:`, error)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
timerConfig.timer = setInterval(wrappedCallback, interval)
|
||||
this.timers.set(id, timerConfig)
|
||||
|
||||
// 如果不跳过初始运行，立即执行一次
|
||||
if (!skipInitialRun) {
|
||||
wrappedCallback()
|
||||
}
|
||||
|
||||
console.log(`Background: 添加定时器 ${id}, 间隔 ${interval}ms`)
|
||||
}
|
||||
|
||||
/**
|
||||
* 移除定时器
|
||||
*/
|
||||
removeTimer(id: string) {
|
||||
const timerConfig = this.timers.get(id)
|
||||
if (timerConfig) {
|
||||
if (timerConfig.timer) {
|
||||
clearInterval(timerConfig.timer)
|
||||
}
|
||||
this.timers.delete(id)
|
||||
console.log(`Background: 移除定时器 ${id}`)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 暂停所有定时器
|
||||
*/
|
||||
private pauseAllTimers() {
|
||||
this.timers.forEach((timerConfig, id) => {
|
||||
if (timerConfig.timer && !timerConfig.runInBackground) {
|
||||
clearInterval(timerConfig.timer)
|
||||
timerConfig.timer = null
|
||||
timerConfig.pausedAt = Date.now()
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
/**
|
||||
* 恢复所有定时器
|
||||
*/
|
||||
private resumeAllTimers() {
|
||||
this.timers.forEach((timerConfig, id) => {
|
||||
if (!timerConfig.timer) {
|
||||
const wrappedCallback = () => {
|
||||
if (this.isDestroyed) return
|
||||
|
||||
if (!this.isBackground || timerConfig.runInBackground) {
|
||||
try {
|
||||
timerConfig.callback()
|
||||
} catch (error) {
|
||||
console.error(`Background: 定时器 ${id} 执行错误:`, error)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
timerConfig.timer = setInterval(wrappedCallback, timerConfig.interval)
|
||||
delete timerConfig.pausedAt
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取定时器状态
|
||||
*/
|
||||
getTimerStatus(id: string): 'running' | 'paused' | 'not-found' {
|
||||
const timerConfig = this.timers.get(id)
|
||||
if (!timerConfig) return 'not-found'
|
||||
return timerConfig.timer ? 'running' : 'paused'
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取所有定时器信息
|
||||
*/
|
||||
getTimersInfo(): Array<{
|
||||
id: string
|
||||
interval: number
|
||||
status: 'running' | 'paused'
|
||||
runInBackground: boolean
|
||||
pausedAt?: number
|
||||
}> {
|
||||
return Array.from(this.timers.entries()).map(([id, config]) => ({
|
||||
id,
|
||||
interval: config.interval,
|
||||
status: config.timer ? 'running' : 'paused',
|
||||
runInBackground: config.runInBackground || false,
|
||||
pausedAt: config.pausedAt
|
||||
}))
|
||||
}
|
||||
|
||||
/**
|
||||
* 检查用户是否活跃
|
||||
*/
|
||||
isUserActive(maxInactiveTime = 5 * 60 * 1000): boolean {
|
||||
return Date.now() - this.lastActivityTime < maxInactiveTime
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取最后活动时间
|
||||
*/
|
||||
getLastActivityTime(): number {
|
||||
return this.lastActivityTime
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取当前状态
|
||||
*/
|
||||
getStatus(): {
|
||||
isBackground: boolean
|
||||
isDestroyed: boolean
|
||||
timerCount: number
|
||||
lastActivityTime: number
|
||||
isUserActive: boolean
|
||||
} {
|
||||
return {
|
||||
isBackground: this.isBackground,
|
||||
isDestroyed: this.isDestroyed,
|
||||
timerCount: this.timers.size,
|
||||
lastActivityTime: this.lastActivityTime,
|
||||
isUserActive: this.isUserActive()
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 销毁管理器
|
||||
*/
|
||||
destroy() {
|
||||
this.isDestroyed = true
|
||||
|
||||
// 清理所有定时器
|
||||
this.timers.forEach((timerConfig, id) => {
|
||||
if (timerConfig.timer) {
|
||||
clearInterval(timerConfig.timer)
|
||||
}
|
||||
})
|
||||
this.timers.clear()
|
||||
|
||||
// 清理活动跟踪定时器
|
||||
if (this.activityTimer) {
|
||||
clearInterval(this.activityTimer)
|
||||
this.activityTimer = null
|
||||
}
|
||||
|
||||
console.log('Background: 管理器已销毁')
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 全局后台管理器实例
|
||||
*/
|
||||
export const backgroundManager = new BackgroundManager()
|
||||
|
||||
/**
|
||||
* 便捷的定时器管理函数
|
||||
*/
|
||||
export function addBackgroundTimer(
|
||||
id: string,
|
||||
callback: () => void,
|
||||
interval: number,
|
||||
options?: {
|
||||
runInBackground?: boolean
|
||||
skipInitialRun?: boolean
|
||||
}
|
||||
) {
|
||||
backgroundManager.addTimer(id, callback, interval, options)
|
||||
}
|
||||
|
||||
export function removeBackgroundTimer(id: string) {
|
||||
backgroundManager.removeTimer(id)
|
||||
}
|
||||
|
||||
export function getBackgroundTimerStatus(id: string) {
|
||||
return backgroundManager.getTimerStatus(id)
|
||||
}
|
||||
221
src/utils/sseManager.ts
Normal file
221
src/utils/sseManager.ts
Normal file
@@ -0,0 +1,221 @@
|
||||
/**
|
||||
* SSE连接管理器
|
||||
* 优化后台SSE连接，减少iOS系统杀掉应用的概率
|
||||
*/
|
||||
export class SSEManager {
|
||||
private eventSource: EventSource | null = null
|
||||
private url: string
|
||||
private isBackground = false
|
||||
private reconnectTimer: number | null = null
|
||||
private backgroundCloseTimer: number | null = null
|
||||
private listeners: Map<string, (event: MessageEvent) => void> = new Map()
|
||||
private options: {
|
||||
backgroundCloseDelay: number
|
||||
reconnectDelay: number
|
||||
maxReconnectAttempts: number
|
||||
}
|
||||
|
||||
constructor(url: string, options: Partial<typeof SSEManager.prototype.options> = {}) {
|
||||
this.url = url
|
||||
this.options = {
|
||||
backgroundCloseDelay: 5000, // 5秒后关闭后台连接
|
||||
reconnectDelay: 3000, // 3秒后重连
|
||||
maxReconnectAttempts: 3,
|
||||
...options
|
||||
}
|
||||
|
||||
this.setupVisibilityListener()
|
||||
}
|
||||
|
||||
private setupVisibilityListener() {
|
||||
document.addEventListener('visibilitychange', () => {
|
||||
if (document.hidden) {
|
||||
this.handleBackground()
|
||||
} else {
|
||||
this.handleForeground()
|
||||
}
|
||||
})
|
||||
|
||||
// 页面卸载时关闭连接
|
||||
window.addEventListener('beforeunload', () => {
|
||||
this.close()
|
||||
})
|
||||
}
|
||||
|
||||
private handleBackground() {
|
||||
this.isBackground = true
|
||||
|
||||
// 延迟关闭SSE连接，避免频繁切换
|
||||
if (this.backgroundCloseTimer) {
|
||||
clearTimeout(this.backgroundCloseTimer)
|
||||
}
|
||||
|
||||
this.backgroundCloseTimer = window.setTimeout(() => {
|
||||
if (this.isBackground && this.eventSource) {
|
||||
console.log('SSE: 后台关闭连接')
|
||||
this.eventSource.close()
|
||||
this.eventSource = null
|
||||
}
|
||||
}, this.options.backgroundCloseDelay)
|
||||
}
|
||||
|
||||
private handleForeground() {
|
||||
this.isBackground = false
|
||||
|
||||
// 清除后台关闭定时器
|
||||
if (this.backgroundCloseTimer) {
|
||||
clearTimeout(this.backgroundCloseTimer)
|
||||
this.backgroundCloseTimer = null
|
||||
}
|
||||
|
||||
// 立即重新建立连接
|
||||
if (!this.eventSource || this.eventSource.readyState === EventSource.CLOSED) {
|
||||
console.log('SSE: 前台恢复连接')
|
||||
this.reconnectSSE()
|
||||
}
|
||||
}
|
||||
|
||||
private reconnectSSE(attemptCount = 0) {
|
||||
if (attemptCount >= this.options.maxReconnectAttempts) {
|
||||
console.warn('SSE: 达到最大重连次数')
|
||||
return
|
||||
}
|
||||
|
||||
try {
|
||||
this.eventSource = new EventSource(this.url)
|
||||
|
||||
this.eventSource.onopen = () => {
|
||||
console.log('SSE: 连接已建立')
|
||||
}
|
||||
|
||||
this.eventSource.onerror = (error) => {
|
||||
console.error('SSE: 连接错误', error)
|
||||
|
||||
if (this.eventSource?.readyState === EventSource.CLOSED) {
|
||||
// 连接已关闭，尝试重连
|
||||
if (this.reconnectTimer) {
|
||||
clearTimeout(this.reconnectTimer)
|
||||
}
|
||||
|
||||
this.reconnectTimer = window.setTimeout(() => {
|
||||
if (!this.isBackground) {
|
||||
this.reconnectSSE(attemptCount + 1)
|
||||
}
|
||||
}, this.options.reconnectDelay)
|
||||
}
|
||||
}
|
||||
|
||||
this.eventSource.onmessage = (event) => {
|
||||
// 分发消息给所有监听器
|
||||
this.listeners.forEach(listener => {
|
||||
try {
|
||||
listener(event)
|
||||
} catch (error) {
|
||||
console.error('SSE: 监听器错误', error)
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
} catch (error) {
|
||||
console.error('SSE: 创建连接失败', error)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 添加消息监听器
|
||||
*/
|
||||
addMessageListener(id: string, listener: (event: MessageEvent) => void) {
|
||||
this.listeners.set(id, listener)
|
||||
|
||||
// 如果还没有连接，现在建立连接
|
||||
if (!this.eventSource && !this.isBackground) {
|
||||
this.reconnectSSE()
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 移除消息监听器
|
||||
*/
|
||||
removeMessageListener(id: string) {
|
||||
this.listeners.delete(id)
|
||||
|
||||
// 如果没有监听器了，关闭连接
|
||||
if (this.listeners.size === 0) {
|
||||
this.close()
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 关闭连接
|
||||
*/
|
||||
close() {
|
||||
if (this.eventSource) {
|
||||
this.eventSource.close()
|
||||
this.eventSource = null
|
||||
}
|
||||
|
||||
if (this.reconnectTimer) {
|
||||
clearTimeout(this.reconnectTimer)
|
||||
this.reconnectTimer = null
|
||||
}
|
||||
|
||||
if (this.backgroundCloseTimer) {
|
||||
clearTimeout(this.backgroundCloseTimer)
|
||||
this.backgroundCloseTimer = null
|
||||
}
|
||||
|
||||
this.listeners.clear()
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取连接状态
|
||||
*/
|
||||
get readyState(): number {
|
||||
return this.eventSource?.readyState ?? EventSource.CLOSED
|
||||
}
|
||||
|
||||
/**
|
||||
* 获取连接URL
|
||||
*/
|
||||
get connectionUrl(): string {
|
||||
return this.url
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* SSE管理器单例
|
||||
*/
|
||||
class SSEManagerSingleton {
|
||||
private managers: Map<string, SSEManager> = new Map()
|
||||
|
||||
/**
|
||||
* 获取或创建SSE管理器
|
||||
*/
|
||||
getManager(url: string, options?: ConstructorParameters<typeof SSEManager>[1]): SSEManager {
|
||||
if (!this.managers.has(url)) {
|
||||
this.managers.set(url, new SSEManager(url, options))
|
||||
}
|
||||
return this.managers.get(url)!
|
||||
}
|
||||
|
||||
/**
|
||||
* 关闭指定URL的管理器
|
||||
*/
|
||||
closeManager(url: string) {
|
||||
const manager = this.managers.get(url)
|
||||
if (manager) {
|
||||
manager.close()
|
||||
this.managers.delete(url)
|
||||
}
|
||||
}
|
||||
|
||||
/**
|
||||
* 关闭所有管理器
|
||||
*/
|
||||
closeAllManagers() {
|
||||
this.managers.forEach(manager => manager.close())
|
||||
this.managers.clear()
|
||||
}
|
||||
}
|
||||
|
||||
export const sseManagerSingleton = new SSEManagerSingleton()
|
||||
428
使用示例.md
Normal file
428
使用示例.md
Normal file
@@ -0,0 +1,428 @@
|
||||
# 后台优化工具使用示例
|
||||
|
||||
## 1. SSE连接优化
|
||||
|
||||
### 原始代码（UserNotification.vue）
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
// 原始实现
|
||||
let eventSource: EventSource | null = null
|
||||
|
||||
function startSSEMessager() {
|
||||
setTimeout(() => {
|
||||
eventSource = new EventSource(`${import.meta.env.VITE_API_BASE_URL}system/message`)
|
||||
eventSource.addEventListener('message', event => {
|
||||
if (event.data) {
|
||||
const noti: SystemNotification = JSON.parse(event.data)
|
||||
notificationList.value.unshift(noti)
|
||||
hasNewMessage.value = true
|
||||
}
|
||||
})
|
||||
}, 3000)
|
||||
}
|
||||
|
||||
onBeforeMount(async () => {
|
||||
startSSEMessager()
|
||||
})
|
||||
|
||||
onBeforeUnmount(() => {
|
||||
if (eventSource) eventSource.close()
|
||||
})
|
||||
</script>
|
||||
```
|
||||
|
||||
### 优化后的代码
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
import { sseManagerSingleton } from '@/utils/sseManager'
|
||||
import { SystemNotification } from '@/api/types'
|
||||
|
||||
// 使用优化后的SSE管理器
|
||||
const sseManager = sseManagerSingleton.getManager(
|
||||
`${import.meta.env.VITE_API_BASE_URL}system/message`,
|
||||
{
|
||||
backgroundCloseDelay: 5000, // 5秒后关闭后台连接
|
||||
reconnectDelay: 3000,
|
||||
maxReconnectAttempts: 3
|
||||
}
|
||||
)
|
||||
|
||||
// 消息处理函数
|
||||
function handleMessage(event: MessageEvent) {
|
||||
if (event.data) {
|
||||
const noti: SystemNotification = JSON.parse(event.data)
|
||||
notificationList.value.unshift(noti)
|
||||
hasNewMessage.value = true
|
||||
}
|
||||
}
|
||||
|
||||
onBeforeMount(async () => {
|
||||
// 延迟3秒后添加监听器
|
||||
setTimeout(() => {
|
||||
sseManager.addMessageListener('user-notification', handleMessage)
|
||||
}, 3000)
|
||||
})
|
||||
|
||||
onBeforeUnmount(() => {
|
||||
// 移除监听器（如果没有其他监听器，会自动关闭连接）
|
||||
sseManager.removeMessageListener('user-notification')
|
||||
})
|
||||
</script>
|
||||
```
|
||||
|
||||
## 2. 定时器优化
|
||||
|
||||
### 原始代码（App.vue）
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
let backgroundRotationTimer: NodeJS.Timeout | null = null
|
||||
|
||||
function startBackgroundRotation() {
|
||||
if (backgroundRotationTimer) clearInterval(backgroundRotationTimer)
|
||||
|
||||
if (backgroundImages.value.length > 1) {
|
||||
backgroundRotationTimer = setInterval(() => {
|
||||
const nextIndex = (activeImageIndex.value + 1) % backgroundImages.value.length
|
||||
preloadImage(backgroundImages.value[nextIndex]).then(success => {
|
||||
if (success) {
|
||||
activeImageIndex.value = nextIndex
|
||||
}
|
||||
})
|
||||
}, 10000)
|
||||
}
|
||||
}
|
||||
|
||||
onMounted(() => {
|
||||
startBackgroundRotation()
|
||||
})
|
||||
|
||||
onUnmounted(() => {
|
||||
if (backgroundRotationTimer) {
|
||||
clearInterval(backgroundRotationTimer)
|
||||
backgroundRotationTimer = null
|
||||
}
|
||||
})
|
||||
</script>
|
||||
```
|
||||
|
||||
### 优化后的代码
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
import { addBackgroundTimer, removeBackgroundTimer } from '@/utils/backgroundManager'
|
||||
|
||||
function rotateBackground() {
|
||||
if (backgroundImages.value.length > 1) {
|
||||
const nextIndex = (activeImageIndex.value + 1) % backgroundImages.value.length
|
||||
preloadImage(backgroundImages.value[nextIndex]).then(success => {
|
||||
if (success) {
|
||||
activeImageIndex.value = nextIndex
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
|
||||
function startBackgroundRotation() {
|
||||
// 使用后台管理器，自动处理前台/后台切换
|
||||
addBackgroundTimer(
|
||||
'background-rotation',
|
||||
rotateBackground,
|
||||
10000, // 10秒间隔
|
||||
{
|
||||
runInBackground: false, // 后台时不运行
|
||||
skipInitialRun: true
|
||||
}
|
||||
)
|
||||
}
|
||||
|
||||
onMounted(() => {
|
||||
startBackgroundRotation()
|
||||
})
|
||||
|
||||
onUnmounted(() => {
|
||||
removeBackgroundTimer('background-rotation')
|
||||
})
|
||||
</script>
|
||||
```
|
||||
|
||||
## 3. 仪表盘数据刷新优化
|
||||
|
||||
### 原始代码（AnalyticsMemory.vue）
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
let refreshTimer: NodeJS.Timeout | null = null
|
||||
|
||||
async function loadMemoryInfo() {
|
||||
try {
|
||||
const res: MemoryInfo = await api.get('dashboard/memory')
|
||||
memoryInfo.value = res
|
||||
} catch (error) {
|
||||
console.error('Failed to load memory info:', error)
|
||||
}
|
||||
}
|
||||
|
||||
onMounted(async () => {
|
||||
await loadMemoryInfo()
|
||||
refreshTimer = setInterval(loadMemoryInfo, 3000)
|
||||
})
|
||||
|
||||
onUnmounted(() => {
|
||||
if (refreshTimer) {
|
||||
clearInterval(refreshTimer)
|
||||
refreshTimer = null
|
||||
}
|
||||
})
|
||||
</script>
|
||||
```
|
||||
|
||||
### 优化后的代码
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
import { addBackgroundTimer, removeBackgroundTimer } from '@/utils/backgroundManager'
|
||||
|
||||
async function loadMemoryInfo() {
|
||||
try {
|
||||
const res: MemoryInfo = await api.get('dashboard/memory')
|
||||
memoryInfo.value = res
|
||||
} catch (error) {
|
||||
console.error('Failed to load memory info:', error)
|
||||
}
|
||||
}
|
||||
|
||||
onMounted(async () => {
|
||||
// 立即加载一次
|
||||
await loadMemoryInfo()
|
||||
|
||||
// 添加定时刷新，后台时自动暂停
|
||||
addBackgroundTimer(
|
||||
'memory-refresh',
|
||||
loadMemoryInfo,
|
||||
3000, // 3秒间隔
|
||||
{
|
||||
runInBackground: false, // 后台时不刷新
|
||||
skipInitialRun: true // 已经手动加载过了
|
||||
}
|
||||
)
|
||||
})
|
||||
|
||||
onUnmounted(() => {
|
||||
removeBackgroundTimer('memory-refresh')
|
||||
})
|
||||
</script>
|
||||
```
|
||||
|
||||
## 4. PWA状态管理优化
|
||||
|
||||
### 原始代码（pwaStateManager.ts）
|
||||
```typescript
|
||||
private setupPeriodicSave(): void {
|
||||
// 每30秒保存一次状态
|
||||
setInterval(() => {
|
||||
if (!document.hidden) {
|
||||
this.saveCurrentState()
|
||||
}
|
||||
}, 30000)
|
||||
}
|
||||
```
|
||||
|
||||
### 优化后的代码
|
||||
```typescript
|
||||
import { addBackgroundTimer } from '@/utils/backgroundManager'
|
||||
|
||||
private setupPeriodicSave(): void {
|
||||
// 使用后台管理器，延长间隔并添加用户活跃检查
|
||||
addBackgroundTimer(
|
||||
'pwa-state-save',
|
||||
() => {
|
||||
// 只在用户活跃时保存状态
|
||||
if (this.isUserActive()) {
|
||||
this.saveCurrentState()
|
||||
}
|
||||
},
|
||||
60000, // 改为60秒
|
||||
{
|
||||
runInBackground: false, // 后台时不保存
|
||||
skipInitialRun: true
|
||||
}
|
||||
)
|
||||
}
|
||||
|
||||
private isUserActive(): boolean {
|
||||
// 检查用户是否在最近5分钟内有活动
|
||||
const lastActivity = this.getLastActivityTime()
|
||||
return Date.now() - lastActivity < 300000
|
||||
}
|
||||
|
||||
private getLastActivityTime(): number {
|
||||
// 可以从后台管理器获取最后活动时间
|
||||
return backgroundManager.getLastActivityTime()
|
||||
}
|
||||
```
|
||||
|
||||
## 5. 统一的组件优化模式
|
||||
|
||||
### 创建一个通用的组合函数
|
||||
```typescript
|
||||
// src/composables/useBackgroundOptimization.ts
|
||||
import { onMounted, onUnmounted } from 'vue'
|
||||
import { sseManagerSingleton } from '@/utils/sseManager'
|
||||
import { addBackgroundTimer, removeBackgroundTimer } from '@/utils/backgroundManager'
|
||||
|
||||
export function useBackgroundOptimization() {
|
||||
// SSE连接管理
|
||||
const useSSE = (url: string, messageHandler: (event: MessageEvent) => void, listenerId: string) => {
|
||||
const manager = sseManagerSingleton.getManager(url)
|
||||
|
||||
onMounted(() => {
|
||||
manager.addMessageListener(listenerId, messageHandler)
|
||||
})
|
||||
|
||||
onUnmounted(() => {
|
||||
manager.removeMessageListener(listenerId)
|
||||
})
|
||||
|
||||
return manager
|
||||
}
|
||||
|
||||
// 定时器管理
|
||||
const useTimer = (
|
||||
id: string,
|
||||
callback: () => void,
|
||||
interval: number,
|
||||
options?: {
|
||||
runInBackground?: boolean
|
||||
skipInitialRun?: boolean
|
||||
}
|
||||
) => {
|
||||
onMounted(() => {
|
||||
addBackgroundTimer(id, callback, interval, options)
|
||||
})
|
||||
|
||||
onUnmounted(() => {
|
||||
removeBackgroundTimer(id)
|
||||
})
|
||||
}
|
||||
|
||||
return {
|
||||
useSSE,
|
||||
useTimer
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### 使用通用组合函数
|
||||
```vue
|
||||
<script setup lang="ts">
|
||||
import { useBackgroundOptimization } from '@/composables/useBackgroundOptimization'
|
||||
|
||||
const { useSSE, useTimer } = useBackgroundOptimization()
|
||||
|
||||
// 使用SSE
|
||||
useSSE(
|
||||
`${import.meta.env.VITE_API_BASE_URL}system/message`,
|
||||
(event: MessageEvent) => {
|
||||
// 处理消息
|
||||
},
|
||||
'component-sse'
|
||||
)
|
||||
|
||||
// 使用定时器
|
||||
useTimer(
|
||||
'component-timer',
|
||||
() => {
|
||||
// 定时执行的任务
|
||||
},
|
||||
5000,
|
||||
{ runInBackground: false }
|
||||
)
|
||||
</script>
|
||||
```
|
||||
|
||||
## 6. 调试和监控
|
||||
|
||||
### 添加开发工具
|
||||
```typescript
|
||||
// src/utils/backgroundDebug.ts
|
||||
import { backgroundManager } from '@/utils/backgroundManager'
|
||||
|
||||
export function createBackgroundDebugger() {
|
||||
if (import.meta.env.DEV) {
|
||||
// 在开发环境中添加全局调试函数
|
||||
;(window as any).backgroundDebug = {
|
||||
getStatus: () => backgroundManager.getStatus(),
|
||||
getTimersInfo: () => backgroundManager.getTimersInfo(),
|
||||
logStatus: () => {
|
||||
console.table(backgroundManager.getTimersInfo())
|
||||
console.log('Background Status:', backgroundManager.getStatus())
|
||||
}
|
||||
}
|
||||
|
||||
// 定期输出状态信息
|
||||
setInterval(() => {
|
||||
if (backgroundManager.getStatus().timerCount > 0) {
|
||||
console.log('Background timers:', backgroundManager.getTimersInfo())
|
||||
}
|
||||
}, 30000)
|
||||
}
|
||||
}
|
||||
```
|
||||
|
||||
### 在main.ts中启用调试
|
||||
```typescript
|
||||
// src/main.ts
|
||||
import { createBackgroundDebugger } from '@/utils/backgroundDebug'
|
||||
|
||||
// 启用后台调试
|
||||
createBackgroundDebugger()
|
||||
```
|
||||
|
||||
## 7. 性能监控
|
||||
|
||||
### 添加性能统计
|
||||
```typescript
|
||||
// src/utils/performanceMonitor.ts
|
||||
export class PerformanceMonitor {
|
||||
private metrics: {
|
||||
sseConnections: number
|
||||
activeTimers: number
|
||||
backgroundSwitches: number
|
||||
lastBackgroundTime: number
|
||||
} = {
|
||||
sseConnections: 0,
|
||||
activeTimers: 0,
|
||||
backgroundSwitches: 0,
|
||||
lastBackgroundTime: 0
|
||||
}
|
||||
|
||||
constructor() {
|
||||
this.setupMonitoring()
|
||||
}
|
||||
|
||||
private setupMonitoring() {
|
||||
document.addEventListener('visibilitychange', () => {
|
||||
if (document.hidden) {
|
||||
this.metrics.backgroundSwitches++
|
||||
this.metrics.lastBackgroundTime = Date.now()
|
||||
}
|
||||
})
|
||||
}
|
||||
|
||||
getMetrics() {
|
||||
return { ...this.metrics }
|
||||
}
|
||||
|
||||
logMetrics() {
|
||||
console.log('PWA Performance Metrics:', this.getMetrics())
|
||||
}
|
||||
}
|
||||
|
||||
export const performanceMonitor = new PerformanceMonitor()
|
||||
```
|
||||
|
||||
这些优化方案可以显著减少PWA应用在iOS后台的资源消耗，提高应用的生存能力。关键在于：
|
||||
|
||||
1. **SSE连接在后台自动关闭**，前台时自动重连
|
||||
2. **定时器在后台自动暂停**，前台时自动恢复
|
||||
3. **统一的后台活动管理**，避免资源浪费
|
||||
4. **用户活跃状态检测**，只在必要时执行后台任务
|
||||
|
||||
建议优先实施SSE连接优化和定时器优化，这两项改动可以立即看到效果。
|
||||
Reference in New Issue
Block a user