trigger

type CacheEntry struct {
	Key       string
	Namespace string
	Triggers  []trigger.ObjectFieldTrigger
}

type ImageReactor interface {
	ImageChanged(obj interface{}, tagRetriever TagRetriever) error
}

type Indexer interface {
	// Index takes the given pair of objects and turns it into a key and a value. The returned key
	// will be used to store the object. obj is set on adds and updates, old is set on deletes and updates.
	// Changed should be true if the triggers changed.  Operations is a list of actions that should be sent
	// to the reaction.
	Index(obj, old interface{}) (key string, entry *CacheEntry, change cache.DeltaType, err error)
}

type TagRetriever interface {
	ImageStreamTag(namespace, name string) (ref string, rv int64, ok bool)
}