db

type IDBReader interface {
	Get(key []byte) (value []byte, err error)
	Gets(key []byte, count uint) (keys [][]byte, value [][]byte, err error)
	GetIterator(key []byte) (iterator IIterator, err error)
}

type IDBReaderWriter interface {
	IDBReader
	IDBWriter
}

type IDBWriter interface {
	Put(key []byte, value []byte) (err error)
	Puts(keys [][]byte, values [][]byte) (err error)
	Delete(key []byte) (err error)
	Drop() (err error)
}

type IDatabase interface {
	OpenReader(dbName string) (reader IDatabaseReader, err error)
	OpenWriter(dbName string) (writer IDatabaseWriter, err error)
	Open(dbName string) (rw IDatabaseWriterReader, err error)
	Snapshot() (ISnapshot, error)
	Close() (err error)
}

type IDatabaseReader interface {
	IDBReader
}

type IDatabaseWriter interface {
	IDBWriter
}

type IDatabaseWriterReader interface {
	IDBReaderWriter
}

type IIterator interface {
	Next() (err error)
	Prev() (err error)
	Key() (key []byte, err error)
	Value() (value []byte, err error)
	Close()
}

type ISnapshot interface {
	Put(dbName string, key []byte, value []byte) (err error)
	Get(dbName string, key []byte) (value []byte, err error)
	Commit() error
	Rollback()
}