Struct mutationCache

tools/cache/mutation_cache.go:76–85

mutationCache doesn't guarantee that it returns values added via Mutation since they can page out and since you can't distinguish between, "didn't observe create" and "was deleted after create", if the key is missing from the backing cache, we always return it as missing

// since you can't distinguish between, "didn't observe create" and "was deleted after create",
// if the key is missing from the backing cache, we always return it as missing
type mutationCache struct {
	lock          sync.Mutex
	backingCache  Store
	indexer       Indexer
	mutationCache *utilcache.LRUExpireCache
	includeAdds   bool
	ttl           time.Duration

	comparator ResourceVersionComparator
}

// GetByKey is never guaranteed to return back the value set in Mutation.  It could be paged out, it could
// be older than another copy, the backingCache may be more recent or, you might have written twice into the same key.