backend

type Backend interface {
	// GetKeys returns a list of keys for a given path
	GetKeys(bucket []string) ([]string, error)
	// CreateVal creates value with a given TTL and key in the bucket
	// if the value already exists, returns AlreadyExistsError
	CreateVal(bucket []string, key string, val []byte, ttl time.Duration) error
	// TouchVal updates the TTL of the key without changing the value
	TouchVal(bucket []string, key string, ttl time.Duration) error
	// UpsertVal updates or inserts value with a given TTL into a bucket
	// ForeverTTL for no TTL
	UpsertVal(bucket []string, key string, val []byte, ttl time.Duration) error
	// GetVal return a value for a given key in the bucket
	GetVal(path []string, key string) ([]byte, error)
	// GetValAndTTL returns value and TTL for a key in bucket
	GetValAndTTL(bucket []string, key string) ([]byte, time.Duration, error)
	// DeleteKey deletes a key in a bucket
	DeleteKey(bucket []string, key string) error
	// DeleteBucket deletes the bucket by a given path
	DeleteBucket(path []string, bkt string) error
	// AcquireLock grabs a lock that will be released automatically in TTL
	AcquireLock(token string, ttl time.Duration) error
	// ReleaseLock forces lock release before TTL
	ReleaseLock(token string) error
	// CompareAndSwap implements compare ans swap operation for a key
	CompareAndSwap(bucket []string, key string, val []byte, ttl time.Duration, prevVal []byte) ([]byte, error)
	// Close releases the resources taken up by this backend
	Close() error
}

type JSONCodec struct {
	Backend
}