README.md

cache-demo

基于golang实现的本地缓存

项目思路与功能

使用map实现本地缓存

1. 实现LRU缓存
2. 实现TTL过期时间LRU缓存
3. 实现TTL过期时间缓存

使用示例：

func TestLRUCache(t *testing.T) {

    config := cache.NewCacheConfig(0, 20, cache.ChangeCallbacks{
        OnAdd: func() {
            fmt.Println("entry add...")
        },
        OnGet: func() {
            fmt.Println("entry get...")
        },
        OnRemove: func() {
            fmt.Println("entry delete...")
        },
    })
    
    lruCache := cache.NewCache(config.LRUCacheMode(), config)
    
    lruCache.Add(1, "this is test 1")
    lruCache.Add(2, "this is test 2")
    lruCache.Add(3, "this is test 3")
    lruCache.Add(4, "this is test 4")
    lruCache.Add(5, "this is test 5")
    lruCache.Add(6, "this is test 6")
    
    log.Println("init LRU lruCache finish")
    log.Printf("lruCache size: %d", lruCache.Size())
    
    if v, ok := lruCache.Get(2); ok {
        log.Printf("get key (%d) success, value: %s", 2, v)
    }
    
    if v, ok := lruCache.Get(3); ok {
        log.Printf("get key (%d) success, value: %s", 3, v)
    }
    
    lruCache.Add(7, "this is test 7")
    lruCache.Add(8, "this is test 8")
    
    if _, ok := lruCache.Get(4); !ok {
        log.Printf("get key (%d) failed", 4)
    }
}

func TestLRUWithTTLCache(t *testing.T) {
    config := cache.NewCacheConfig(4, 20, cache.ChangeCallbacks{
        OnAdd: func() {
            fmt.Println("entry add...")
        },
        OnGet: func() {
            fmt.Println("entry get...")
        },
        OnRemove: func() {
            fmt.Println("entry delete...")
        },
    })
    
    lruWithTTLCache := cache.NewCache(config.LRUWithTTLCacheMode(), config)
    
    lruWithTTLCache.Add(1, "this is test 1")
    lruWithTTLCache.Add(2, "this is test 2")
    lruWithTTLCache.Add(3, "this is test 3")
    lruWithTTLCache.Add(4, "this is test 4")
    lruWithTTLCache.Add(5, "this is test 5")
    lruWithTTLCache.Add(6, "this is test 6")
    
    log.Println("init LRU TTL cache finish")
    log.Printf("cache size: %d", lruWithTTLCache.Size())
    
    if v, ok := lruWithTTLCache.Get(2); ok {
        log.Printf("get key (%d) success, value: %s", 2, v)
    }
    
    time.Sleep(5 * time.Second)
    
    if _, ok := lruWithTTLCache.Get(2); !ok {
        log.Printf("get key (%d) failed", 2)
    }
}

func TestTTLCache(t *testing.T) {
    config := cache.NewCacheConfig(time.Duration(10), 20, cache.ChangeCallbacks{
        OnAdd: func() {
            fmt.Println("entry add...")
        },
        OnGet: func() {
            fmt.Println("entry get...")
        },
        OnRemove: func() {
            fmt.Println("entry delete...")
        },
    })
    
    tllCache := cache.NewCache(config.TTLCacheMode(true), config)
    
    tllCache.Add(1, "this is test 1")
    time.Sleep(3 * time.Millisecond)
    tllCache.Add(2, "this is test 2")
    time.Sleep(3 * time.Millisecond)
    tllCache.Add(3, "this is test 3")
    time.Sleep(3 * time.Millisecond)
    tllCache.Add(4, "this is test 4")
    time.Sleep(3 * time.Millisecond)
    tllCache.Add(5, "this is test 5")
    time.Sleep(3 * time.Millisecond)
    tllCache.Add(6, "this is test 6")
    time.Sleep(3 * time.Millisecond)
    
    log.Println("init TTL cache finish")
    log.Printf("cache size: %d", tllCache.Size())
    
    time.Sleep(3 * time.Second)
    
    if v, ok := tllCache.Get(2); ok {
        log.Printf("get key (%d) success, value: %s", 2, v)
        log.Printf("cache size: %d", tllCache.Size())
    }
    
    time.Sleep(3 * time.Second)
    
    if _, ok := tllCache.Get(3); !ok {
        log.Printf("get key (%d) failed", 3)
        log.Printf("cache size: %d", tllCache.Size())
    }
    
    log.Println("Add new three item")
    tllCache.Add(7, "this is test 7")
    tllCache.Add(8, "this is test 8")
    tllCache.Add(9, "this is test 9")
    log.Printf("cache size: %d", tllCache.Size())
    
    if v, ok := tllCache.Get(8); ok {
        log.Printf("get key (%d) success, value: %s", 8, v)
    }

}