table

type Builder interface {
	// FileNumber returns file name for store builder
	FileNumber() FileNumber
	// Add puts k/v pair init sst file write buffer
	// NOTICE: key must key in sort by desc
	Add(key uint32, value []byte) error
	// StreamWriter returns a writer for streaming writing data
	StreamWriter() StreamWriter
	// MinKey returns min key in store
	MinKey() uint32
	// MaxKey returns max key in store
	MaxKey() uint32
	// Size returns the length of store file
	Size() uint32
	// Count returns the number of k/v pairs contained in the store
	Count() uint64
	// Abandon abandons current store build for some reason
	Abandon() error
	// Close closes sst file write buffer
	Close() error
}

type Cache interface {
	// GetReader returns store reader from cache, create new reader if not exist.
	GetReader(family string, fileName string) (Reader, error)
	// ReleaseReaders releases reader after read completed.
	ReleaseReaders(readers []Reader)
	// Evict evicts file reader from cache.
	Evict(fileName string)
	// Cleanup cleans the expired reader from cache.
	Cleanup()
	// Close cleans cache data after closing reader resource firstly.
	Close() error
}

type FileNumber int64

type Iterator interface {
	// HasNext returns if the iteration has more element.
	// It returns false if the iterator is exhausted.
	HasNext() bool
	// Key returns the key of the current key/value pair
	Key() uint32
	// Value returns the value of the current key/value pair
	Value() []byte
}

type LRUCache struct {
	// contains filtered or unexported fields
}

type Reader interface {
	// Path returns the file path.
	Path() string
	// FileName returns the file name of reader.
	FileName() string
	// Get returns value for giving key,
	// if key not exist, return nil, ErrKeyNotExist.
	Get(key uint32) ([]byte, error)
	// Iterator iterates over a store's key/value pairs in key order.
	Iterator() Iterator
	// Close closes reader, release related resources.
	Close() error
}

type StreamWriter interface {
	// Prepare the writer with specified key
	// Resets the size and checksum
	Prepare(key uint32)
	// Writer writes buffer into the underlying file
	io.Writer
	// Size returns total written size of Write
	// Prepare will resets it to zero.
	Size() uint32
	// CRC32CheckSum returns a IEEE checksum of written bytes
	CRC32CheckSum() uint32
	// Commit marks the key/value pair has been written
	Commit() error
}