interface.go

package leveltable

import "github.com/syndtr/goleveldb/leveldb/iterator"

// Code using batches should try to add this much data to the batch.
// The value was determined empirically.
const IdealBatchSize = 100 * 1024

// Putter wraps the database write operation supported by both batches and regular databases.
type Putter interface {
	Put(key []byte, value []byte) error
}

// Database wraps all database operations. All methods are safe for concurrent use.
type Database interface {
	Putter
	Get(key []byte) ([]byte, error)
	Has(key []byte) (bool, error)
	Delete(key []byte) error
	Close()
	NewBatch() Batch
	NewIterator() iterator.Iterator
	NewPrefixIterator(prefix string) iterator.Iterator
	Table(name string) Database
	NewTableBatch(name string) Batch
}

// Batch is a write-only database that commits changes to its host database
// when Write is called. Batch cannot be used concurrently.
type Batch interface {
	Putter
	ValueSize() int // amount of data in the batch
	Write() error
	// Reset resets the batch for reuse
	Reset()
}