memfile

type AppendableLookupFile ¶

type AppendableLookupFile interface {
	LookupFileWithSize
}

AppendableLookupFile is a LookupFile that may be optimized for the following scenario. The file typically grows by aggressive appending, one element at a time.

func NewAppendOptimizedFile(file *os.File) AppendableLookupFile

type LookupFile ¶

type LookupFile interface {
	io.ReaderAt
	io.WriterAt
	io.Closer
	Sync() error
}

LookupFile is a file-like array-like object. The file has array elements each a fixed number of bytes. Elements are written or read one at a time. By referring to io interfaces, we can arrange for os.File to be a naive non-optimized implementation.

type LookupFileWithSize ¶

type LookupFileWithSize interface {
	LookupFile
	Stat() (os.FileInfo, error)
}

type SparseLookupFile ¶

type SparseLookupFile interface {
	LookupFile
}

SparseLookupFile is a LookupFile that may be optimized for the following scenario. The file is fixed size, and starts life full of zeros. Elements are written or read one at a time.

func NewFixedSizeMemFile(filename string, perm os.FileMode) (SparseLookupFile, error)