cache

type Cache interface {
	Unlock(userID string, passphrase []byte) error
	Lock(userID string)
	Delete(userID string) error

	Has(userID, messageID string) bool
	Get(userID, messageID string) ([]byte, error)
	Set(userID, messageID string, literal []byte) error
	Rem(userID, messageID string) error
}

type Compressor interface {
	Compress([]byte) ([]byte, error)
	Decompress([]byte) ([]byte, error)
}

type GZipCompressor struct{}

type NoopCompressor struct{}

type Options struct {
	MinFreeAbs      uint64
	MinFreeRat      float64
	ConcurrentRead  int
	ConcurrentWrite int
}