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package ccache
import "time"
type SecondaryCache struct {
bucket *bucket
pCache *LayeredCache
}
// Get the secondary key.
// The semantics are the same as for LayeredCache.Get
func (s *SecondaryCache) Get(secondary string) *Item {
return s.bucket.get(secondary)
}
// Set the secondary key to a value.
// The semantics are the same as for LayeredCache.Set
func (s *SecondaryCache) Set(secondary string, value interface{}, duration time.Duration) *Item {
item, existing := s.bucket.set(secondary, value, duration)
if existing != nil {
s.pCache.deletables <- existing
}
s.pCache.promote(item)
return item
}
// Fetch or set a secondary key.
// The semantics are the same as for LayeredCache.Fetch
func (s *SecondaryCache) Fetch(secondary string, duration time.Duration, fetch func() (interface{}, error)) (*Item, error) {
item := s.Get(secondary)
if item != nil {
return item, nil
}
value, err := fetch()
if err != nil {
return nil, err
}
return s.Set(secondary, value, duration), nil
}
// Delete a secondary key.
// The semantics are the same as for LayeredCache.Delete
func (s *SecondaryCache) Delete(secondary string) bool {
item := s.bucket.delete(secondary)
if item != nil {
s.pCache.deletables <- item
return true
}
return false
}
// Replace a secondary key.
// The semantics are the same as for LayeredCache.Replace
func (s *SecondaryCache) Replace(secondary string, value interface{}) bool {
item := s.Get(secondary)
if item == nil {
return false
}
s.Set(secondary, value, item.TTL())
return true
}
// Track a secondary key.
// The semantics are the same as for LayeredCache.TrackingGet
func (c *SecondaryCache) TrackingGet(secondary string) TrackedItem {
item := c.Get(secondary)
if item == nil {
return NilTracked
}
item.track()
return item
}
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