package cache import ( "time" "github.com/jtom38/newsbot/collector/domain/model" ) // When a record becomes tainted, it needs to be renewed or it will be dropped from the cache. // If a record is tainted and used again, the taint will be removed and a new Expires value will be set. // If its not renewed, it will be dropped. type CacheAgeMonitor struct {} func NewCacheAgeMonitor() CacheAgeMonitor { return CacheAgeMonitor{} } // This is an automated job that will review all the objects for age and taint them if needed. func (cam CacheAgeMonitor) CheckExpiredEntries() { now := time.Now() for index, item := range cacheStorage { if now.After(item.Expires) { // the timer expired, and its not tainted, taint it if !item.IsTainted { item.IsTainted = true item.Expires = now.Add(1 * time.Hour) } // if its tainted and the timer didnt get renewed, delete if item.IsTainted { cacheStorage = cam.removeEntry(index) } } } } // This creates a new slice and skips over the item that needs to be dropped func (cam CacheAgeMonitor) removeEntry(index int) []*model.CacheItem { var temp []*model.CacheItem for i, item := range cacheStorage { if i != index { temp = append(temp, item )} } return temp }