Struct WriteLockInfo 

pub struct WriteLockInfo {
    pub abort_lsn: u64,
    pub abort_known_deleted: bool,
    pub abort_key: Option<Vec<u8>>,
    pub abort_data: Option<Vec<u8>>,
    pub abort_vlsn: i64,
    pub abort_log_size: i32,
    pub abort_expiration: i32,
    pub abort_expiration_in_hours: bool,
    pub never_locked: bool,
    pub database_id: u64,
}

Information needed to undo write operations if a transaction aborts.

Stores the “abort version” - the state of a record before this txn modified it. This allows the transaction to restore the previous state on abort.

Fields

abort_lsn: u64

LSN of the record’s abort version.

abort_known_deleted: bool

Whether the abort version is a known-deleted record.

abort_key: Option<Vec<u8>>

Key of the abort version (if key updates allowed).

abort_data: Option<Vec<u8>>

Data of the abort version (if embedded in BIN).

abort_vlsn: i64

VLSN of the abort version.

abort_log_size: i32

On-disk size of the abort version.

abort_expiration: i32

Expiration time of the abort version.

abort_expiration_in_hours: bool

Whether expiration is in hours (true) or days (false).

never_locked: bool

True if the LSN has never been locked before by this Txn.

Per the: “True if this locker has never had this LSN locked, is false otherwise. This is used to determine if the locker must add undo information for a write lock.”

database_id: u64

Database ID of the database that was modified.

Stored so that Txn::abort() can route each UndoRecord to the correct database’s B-tree.

Implementations

impl WriteLockInfo

pub fn new() -> Self

Creates a new WriteLockInfo with default abort version values.

pub fn copy_all_info(&mut self, from: &WriteLockInfo)

Copies all abort information from another WriteLockInfo.

pub fn set_abort_info( &mut self, abort_lsn: u64, abort_key: Option<Vec<u8>>, abort_data: Option<Vec<u8>>, abort_vlsn: i64, abort_log_size: i32, abort_known_deleted: bool, abort_expiration: i32, abort_expiration_in_hours: bool, )

Sets the abort information from a log entry.

pub fn is_null_abort_lsn(&self) -> bool

Returns true if this represents a NULL abort LSN.

Trait Implementations

impl Clone for WriteLockInfo

fn clone(&self) -> WriteLockInfo

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for WriteLockInfo

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for WriteLockInfo

fn default() -> Self

Returns the “default value” for a type.