101 lines
2.0 KiB
Go
101 lines
2.0 KiB
Go
package cache
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import (
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"fmt"
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"sync"
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"time"
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)
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// MemoryMap 用于内存缓存
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type MemoryMap struct {
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cache map[string]interface{}
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expirations map[string]int64
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mu sync.Mutex
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}
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func NewMemoryMap() *MemoryMap {
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m := &MemoryMap{}
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m.init()
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return m
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}
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// init 初始化 MemoryMap 的缓存
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func (m *MemoryMap) init() {
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m.cache = make(map[string]interface{})
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m.expirations = make(map[string]int64)
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}
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func (m *MemoryMap) Get(key string) (interface{}, error) {
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m.mu.Lock()
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defer m.mu.Unlock()
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expiration, exists := m.expirations[key]
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currentTime := time.Now().UnixMilli()
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if exists && currentTime > expiration {
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// 键已过期，删除并返回 nil
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fmt.Printf("Get: key=%s has expired, deleting...\n", key)
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delete(m.cache, key)
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delete(m.expirations, key)
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return nil, nil
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}
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value, ok := m.cache[key]
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if !ok {
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return nil, nil
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}
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return value, nil
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}
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// Set 设置缓存中的值，并指定过期时间（秒）
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func (m *MemoryMap) Set(key string, value interface{}, ttl int) error {
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m.mu.Lock()
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defer m.mu.Unlock()
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m.cache[key] = value
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if ttl == 0 {
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// 默认半小时
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ttl = 30 * 60
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}
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if ttl == -1 {
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// -1 表示永久缓存，不设置过期时间
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delete(m.expirations, key)
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} else {
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expiration := time.Now().UnixMilli() + int64(ttl*1000)
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m.expirations[key] = expiration
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}
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return nil
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}
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func (m *MemoryMap) Exist(key string) (bool, error) {
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m.mu.Lock()
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defer m.mu.Unlock()
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expiration, exists := m.expirations[key]
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currentTime := time.Now().UnixMilli()
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if exists && currentTime > expiration {
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// 键已过期，删除并返回 nil
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fmt.Printf("Get: key=%s has expired, deleting...\n", key)
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delete(m.cache, key)
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delete(m.expirations, key)
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}
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_, ok := m.cache[key]
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return ok, nil
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}
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func (m *MemoryMap) Del(key string) error {
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m.mu.Lock()
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defer m.mu.Unlock()
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if _, ok := m.cache[key]; !ok {
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return nil
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}
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delete(m.cache, key)
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delete(m.expirations, key)
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return nil
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}
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// 编译时检查
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var _ Cacheable = (*MemoryMap)(nil)
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