File

source: bluebase/rm/file.py

---

class RmFileHeader(page: PfPage, *, offset: int, limit: int)

Bases: PfPageView, LayoutMixin

file header를 나타내는 view 클래스입니다.

Layout

Offset	Size	Name	Format
0	4	record_size	'<i'
4	4	record_capacity	'<i'
8	4	first_available_pid	'<i'

PID: ClassVar[PfPageId] = 1

file header의 page id를 나타내는 상수.

NO_AVAILABLE_PAGE: ClassVar[RmPageId] = -1

available page가 없을 경우 사용하는 상수.

size: ClassVar[int] = 12

The total size of the layout, automatically calculated from fields.

class RmFile(file_: PfFile, record_size: int, record_capacity: int)

Bases: object

Variables:

• file (PfFile)

• record_size (int)

• record_capacity (int)

static get_header(page_: PfPage) → RmFileHeader

static fetch_header(file_: PfFile) → tuple[PfPage, RmFileHeader]

classmethod new(file_: PfFile, record_size: int, record_capacity: int) → Self

classmethod open(file_: PfFile) → Self

property first_available_pid: RmPageId | Noneread-write

assignmentget_page(pid: RmPageId) → RmPage

Raises:

RmFileHeaderAccessError –

assignmentfind_next_pid(pid: RmPageId) → RmPageId | None

assignmentget_record(rid: RmRecordId) → RmRecord

Raises:

• RmInvalidSlotIdError –

• RmSlotUnoccupiedError –

assignmentinsert_record(data: RmRecordData) → RmRecordId

Raises:

• RmInvalidSlotIdError –

• RmInvalidRecordDataSizeError –

assignmentdelete_record(rid: RmRecordId) → None

Raises:

• RmInvalidSlotIdError –

• RmSlotUnoccupiedError –

assignmentupdate_record(rid: RmRecordId, data: RmRecordData) → None

Raises:

• RmInvalidSlotIdError –

• RmSlotUnoccupiedError –

• RmInvalidRecordDataSizeError –

assignmentpersist() → None

assignmentvacuum() → None