kvdb

type Batch interface {
	Writer

	// ValueSize retrieves the amount of data queued up for writing.
	ValueSize() int

	// Write flushes any accumulated data to disk.
	Write() error

	// Reset resets the batch for reuse.
	Reset()

	// Replay replays the batch contents.
	Replay(w Writer) error
}

type Batcher interface {
	// NewBatch creates a write-only database that buffers changes to its host db
	// until a final write is called.
	NewBatch() Batch
}

type DBProducer interface {
	// OpenDB or create db with name.
	OpenDB(name string) (DropableStore, error)
}

type DropableStore interface {
	Store
	Droper
}

type Droper interface {
	Drop()
}

type FlushableDBProducer interface {
	DBProducer
	NotFlushedSizeEst() int
	Flush(id []byte) error
}

type FlushableKVStore interface {
	DropableStore

	NotFlushedPairs() int
	NotFlushedSizeEst() int
	Flush() error
	DropNotFlushed()
}

type IterableDBProducer interface {
	DBProducer
	// Names of existing databases.
	Names() []string
}

type Iteratee interface {
	// NewIterator creates a binary-alphabetical iterator over a subset
	// of database content with a particular key prefix, starting at a particular
	// initial key (or after, if it does not exist).
	NewIterator(prefix []byte, start []byte) Iterator
}

type Iterator interface {
	ethdb.Iterator
}

type Reader interface {
	ethdb.KeyValueReader
}

type ReadonlyStore interface {
	Reader
	Iteratee
	ethdb.Stater
}

type Store interface {
	Reader
	Writer
	Batcher
	Iteratee
	ethdb.Stater
	ethdb.Compacter
	io.Closer
}

type Writer interface {
	ethdb.KeyValueWriter
}