Struct cache

tools/cache/store.go:112–118

cache responsibilities are limited to: 1. Computing keys for objects via keyFunc 2. Invoking methods of a ThreadSafeStorage interface

//	1. Computing keys for objects via keyFunc
//  2. Invoking methods of a ThreadSafeStorage interface
type cache struct {
	// cacheStorage bears the burden of thread safety for the cache
	cacheStorage ThreadSafeStore
	// keyFunc is used to make the key for objects stored in and retrieved from items, and
	// should be deterministic.
	keyFunc KeyFunc
}

var _ Store = &cache{}