英文:
Timeout structure in Go
问题
我正在寻找一种具有存储过期数据功能的存储方式。我的意思是，一种可以指定要存储的数据和超时时间的结构，该值在一段时间后会被删除。
英文:
I'm looking for a storage with the ability of storing expiring data. I mean, a structure where you could specify the data to be stored and a timeout, and where that value would be removed after some time.
答案1
得分: 3
如果你需要用于缓存，可以考虑使用cache2go：
cache := cache2go.Cache("c")
val := struct{x string}{"This is a test!"}
cache.Add("valA", 5*time.Second, &val)
cache2go是用于缓存的，它仅在内存中操作，但你可以指定一个数据加载程序来延迟加载给定键的缺失值。数据加载程序可以用于从磁盘加载值：
cache.SetDataLoader(func(key interface{}) *cache2go.CacheItem {
val := loadFromDisk()
item := cache2go.CreateCacheItem(key, 0, val)
return &item
})
go-cache也支持这一点，并支持从磁盘加载缓存项：
func (c *Cache) Set(k string, x interface{}, d time.Duration)
向缓存中添加一个项，替换任何现有项。如果持续时间为0，则使用缓存的默认过期时间。如果为-1，则该项永不过期。func (c *Cache) Save(w io.Writer) error
将缓存的项（使用Gob）写入io.Writer。如果序列化失败，例如因为缓存中存在无法序列化的对象（如通道），则返回错误。func (c *Cache) Load(r io.Reader) error
从io.Reader中添加（Gob序列化的）缓存项，排除当前缓存中已存在的任何项。
英文:
If you need this for caching, consider using cache2go:
cache := cache2go.Cache("c")
val := struct{x string}{"This is a test!"}
cache.Add("valA", 5*time.Second, &val)
As cache2go is for caching it operates on memory alone but you can specify a data loading routine to lazily load a missing value for a given key. The data loader can be utilized to
load the value from disk:
cache.SetDataLoader(func(key interface{}) *cache2go.CacheItem {
val := loadFromDisk()
item := cache2go.CreateCacheItem(key, 0, val)
return &item
})
go-cache supports this as well and supports loading cached items from disk:
> func (c *Cache) Set(k string, x interface{}, d time.Duration)
> Adds an item to the cache, replacing any existing item. If the duration is 0,
> the cache's default expiration time is used. If it is -1, the item never
> expires.
>
> func (c *Cache) Save(w io.Writer) error
> Writes the cache's items (using Gob) to an io.Writer. Returns an error if
> the serialization fails, e.g. because there are unserializable objects like
> channels in the cache.
>
> func (c *Cache) Load(r io.Reader) error
> Adds (Gob-serialized) cache items from an io.Reader, excluding any items that
> already exist in the current cache.
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