A Lazy Cache storage for Go

Lazy cache is a key-value storage that favors returning stale data rather than blocking a caller. A cached item will always be returned, no matter how stale it is. However, expired items will be reloaded in a separate goroutine.

The only time the cache will block is when the key is unknown.

Should fetching an item return an error, an existing value will remain, even if stale.

Example

fetcher := func (id string) (interface{}, error) {
  return id == "foo", nil
}

// Prealocates 256 items. Items are expired after 2 minutes
cache := New(fetcher, time.Minute * 2, 256) 

foo_value, foo_found := cache.Get('foo')
bar_value, bar_found := cache.Get('bar')

Installation

Install using the "go get" command:

go get github.com/viki-org/lazycache