NewTagRetriever will return a tag retriever that can look up image stream tag references from an image stream.

NewTriggerCache constructs a cacher that expects objects of type *trigger.CacheEntry and converts those triggers into entries in the thread safe cache by image stream namespace and name.

NewTriggerController instantiates a trigger controller from the provided sources.

ProcessEvents returns a ResourceEventHandler suitable for use with an Informer to maintain the cache.

ErrUnresolvedTag is used to indicate a resource is not ready to be triggered.

TriggerController updates fields on resources to the docker image reference that an ImageStreamTag points to.

TriggerSource defines the behavior for given resource type that can be triggered by image stream tag changes.