Struct mvcc_cell::Transaction

pub struct Transaction<'a> { /* private fields */ }

A mutable snapshot of the controlled MvccCells. Created via Mvcc::begin().

Implementations

impl<'a> Transaction<'a>

pub fn replace<T: 'a + ?Sized>(
    &mut self,
    cell: &MvccCell<T>,
    val: Box<T>
) -> Option<Box<T>>

Store a new value inside the cell.

Returns the old value iff it was previously written by this transaction

pub fn revert<T: 'a + ?Sized>(&mut self, cell: &MvccCell<T>) -> Option<Box<T>>

Reverts this cell to its value at the beginning of the transaction.

Returns the pending value, if any.

pub fn get_committed<T: 'a + ?Sized>(&self, cell: &MvccCell<T>) -> &T

Get the value of this cell as of the start of the transaction

impl Transaction<'_>

pub fn try_commit(self) -> Result<(), Self>

Attempt to commit changes

Returns Err(self) if any MvccCell seen by this transaction has committed changes since begin() was called.

pub fn can_commit(&self) -> bool

Checks to see if there are any conflicts preventing this transaction from committing.

Note that, because of TOCTOU, try_commit may still fail after this returns true.

Trait Implementations

impl<'a, T: 'a + ?Sized> Index<&MvccCell<T>> for Transaction<'a>

type Output = T

The returned type after indexing.

fn index(&self, cell: &MvccCell<T>) -> &T

Performs the indexing (container[index]) operation.

impl<'a, T: 'a + ?Sized> IndexMut<&MvccCell<T>> for Transaction<'a>where
    Box<T>: Clone,

fn index_mut(&mut self, cell: &MvccCell<T>) -> &mut T

Performs the mutable indexing (container[index]) operation.