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WalRecord

featherdb_storage

Struct WalRecord 

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pub struct WalRecord {
    pub lsn: Lsn,
    pub txn_id: TransactionId,
    pub record_type: WalRecordType,
    pub prev_lsn: Lsn,
    pub page_id: u64,
    pub old_data: Vec<u8>,
    pub new_data: Vec<u8>,
}
Expand description

A WAL record

Fields§

§lsn: Lsn

Log sequence number

§txn_id: TransactionId

Transaction ID

§record_type: WalRecordType

Record type

§prev_lsn: Lsn

Previous LSN for this transaction (for undo chain)

§page_id: u64

Page ID (for Write records)

§old_data: Vec<u8>

Old page data (for undo)

§new_data: Vec<u8>

New page data (for redo)

Implementations§

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impl WalRecord

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pub fn begin(lsn: Lsn, txn_id: TransactionId) -> Self

Create a begin record

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pub fn commit(lsn: Lsn, txn_id: TransactionId, prev_lsn: Lsn) -> Self

Create a commit record

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pub fn abort(lsn: Lsn, txn_id: TransactionId, prev_lsn: Lsn) -> Self

Create an abort record

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pub fn write( lsn: Lsn, txn_id: TransactionId, prev_lsn: Lsn, page_id: u64, old_data: Vec<u8>, new_data: Vec<u8>, ) -> Self

Create a write record

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pub fn checkpoint(lsn: Lsn) -> Self

Create a checkpoint record

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pub fn serialize(&self) -> Vec<u8> ⓘ

Serialize the record to bytes

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pub fn deserialize(data: &[u8]) -> Result<Self>

Deserialize a record from bytes

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pub fn serialized_size(&self) -> usize

Get the total serialized size

Trait Implementations§

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impl Clone for WalRecord

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fn clone(&self) -> WalRecord

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for WalRecord

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

Formats the value using the given formatter. Read more

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🔬This is a nightly-only experimental API. (clone_to_uninit)
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