131 lines
2.5 KiB
Go
131 lines
2.5 KiB
Go
package core
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import (
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"crypto/md5"
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"encoding/hex"
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"fmt"
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"sync"
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"time"
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)
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// CacheItem 缓存项
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type CacheItem struct {
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Data interface{} // 缓存的数据
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ExpiresAt time.Time // 过期时间
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}
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// QueryCache 查询缓存 - 提高重复查询的性能
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type QueryCache struct {
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mu sync.RWMutex // 读写锁
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items map[string]*CacheItem // 缓存项
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duration time.Duration // 默认缓存时长
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}
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// NewQueryCache 创建查询缓存实例
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func NewQueryCache(duration time.Duration) *QueryCache {
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cache := &QueryCache{
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items: make(map[string]*CacheItem),
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duration: duration,
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}
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// 启动清理协程
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go cache.cleaner()
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return cache
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}
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// Set 设置缓存
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func (qc *QueryCache) Set(key string, data interface{}) {
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qc.mu.Lock()
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defer qc.mu.Unlock()
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qc.items[key] = &CacheItem{
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Data: data,
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ExpiresAt: time.Now().Add(qc.duration),
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}
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}
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// Get 获取缓存
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func (qc *QueryCache) Get(key string) (interface{}, bool) {
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qc.mu.RLock()
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defer qc.mu.RUnlock()
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item, exists := qc.items[key]
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if !exists {
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return nil, false
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}
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// 检查是否过期
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if time.Now().After(item.ExpiresAt) {
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return nil, false
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}
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return item.Data, true
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}
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// Delete 删除缓存
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func (qc *QueryCache) Delete(key string) {
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qc.mu.Lock()
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defer qc.mu.Unlock()
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delete(qc.items, key)
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}
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// Clear 清空所有缓存
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func (qc *QueryCache) Clear() {
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qc.mu.Lock()
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defer qc.mu.Unlock()
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qc.items = make(map[string]*CacheItem)
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}
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// cleaner 定期清理过期缓存
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func (qc *QueryCache) cleaner() {
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ticker := time.NewTicker(time.Minute)
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defer ticker.Stop()
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for range ticker.C {
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qc.cleanExpired()
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}
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}
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// cleanExpired 清理过期的缓存项
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func (qc *QueryCache) cleanExpired() {
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qc.mu.Lock()
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defer qc.mu.Unlock()
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now := time.Now()
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for key, item := range qc.items {
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if now.After(item.ExpiresAt) {
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delete(qc.items, key)
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}
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}
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}
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// GenerateCacheKey 生成缓存键
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func GenerateCacheKey(sql string, args ...interface{}) string {
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// 将 SQL 和参数组合成字符串
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keyData := sql
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for _, arg := range args {
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keyData += fmt.Sprintf("%v", arg)
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}
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// 计算 MD5 哈希
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hash := md5.Sum([]byte(keyData))
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return hex.EncodeToString(hash[:])
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}
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// WithCache 带缓存的查询装饰器
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func (q *QueryBuilder) WithCache(cache *QueryCache) IQuery {
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// 生成缓存键
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cacheKey := GenerateCacheKey(q.Build())
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// 尝试从缓存获取
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if data, exists := cache.Get(cacheKey); exists {
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// TODO: 将缓存数据映射到结果对象
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_ = data
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return q
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}
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// 缓存未命中，执行实际查询并缓存结果
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return q
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}
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