package main

import (
	"log"

	"gaeadb/db"
)

func main() {
  // Open the gaeadb database located in the /tmp/gaea.db directory.
  // It will be created if it doesn't exist.
  cfg := db.DefaultConfig()
  cfg.DirName = "/tmp/gaea.db"
  db, err := db.Open(cfg)
  if err != nil {
	  log.Fatal(err)
  }
  defer db.Close()
  // Your code here…
}

type DB interface {
	Close() error

	Del([]byte) error
	Set([]byte, []byte) error
	Get([]byte) ([]byte, error)

	NewTransaction(readOnly bool) (Transaction, error)
}

type Transaction interface {
	Commit() error
	Rollback() error
	Del([]byte) error
	Set([]byte, []byte) error
	Get([]byte) ([]byte, error)
	NewForwardIterator([]byte) (Iterator, error)
	NewBackwardIterator([]byte) (Iterator, error)
}

type Iterator interface {
	Close() error
	Next() error
	Valid() bool
	Key() []byte // can use outside
	Value() ([]byte, error) // can use outside
}