Struct Transaction Manager &nbsp; Copy item path

impl TransactionManager

pub fn new() -> Self

Create a new transaction manager with default settings

pub fn with_max_size(max_size: usize) -> Self

Create a transaction manager with custom size limit

pub fn begin( &mut self, change_log_size: usize, ) -> Result<TransactionId, TransactionError>

Begin a new transaction

§Arguments

change_log_size - Current size of the change log

§Returns

The ID of the newly created transaction

§Errors

Returns AlreadyActive if a transaction is already in progress

pub fn commit(&mut self) -> Result<TransactionId, TransactionError>

Commit the current transaction

§Returns

The ID of the committed transaction

§Errors

Returns NoActiveTransaction if no transaction is active

pub fn rollback_info( &mut self, ) -> Result<(TransactionId, usize), TransactionError>

Get information needed for rollback and clear the transaction

§Returns

A tuple of (transaction_id, start_index) for the transaction

§Errors

Returns NoActiveTransaction if no transaction is active

pub fn add_savepoint( &mut self, name: String, change_log_size: usize, ) -> Result<(), TransactionError>

Add a named savepoint to the current transaction

§Arguments

name - Name for the savepoint
change_log_size - Current size of the change log

§Errors

Returns NoActiveTransaction if no transaction is active

pub fn get_savepoint(&self, name: &str) -> Result<usize, TransactionError>

Get the index for a named savepoint

§Arguments

name - Name of the savepoint to find

§Returns

The change log index where the savepoint was created

§Errors

Returns NoActiveTransaction if no transaction is active Returns SavepointNotFound if the named savepoint doesn’t exist

pub fn truncate_savepoints(&mut self, index: usize)

Remove savepoints after a given index (for partial rollback)

§Arguments

index - Remove all savepoints with index >= this value

pub fn is_active(&self) -> bool

Check if a transaction is currently active

pub fn active_id(&self) -> Option<TransactionId>

Get the ID of the active transaction if any

pub fn check_size(&self, change_log_size: usize) -> Result<(), TransactionError>

Check if transaction size is within limits

§Arguments

change_log_size - Current size of the change log

§Errors

Returns TransactionTooLarge if size exceeds maximum

pub fn max_size(&self) -> usize

Get the maximum transaction size limit

pub fn set_max_size(&mut self, max_size: usize)

Set the maximum transaction size limit

pub fn start_index(&self) -> Option<usize>

Get the start index of the active transaction

pub fn savepoints(&self) -> Vec<(String, usize)>

Get all savepoints in the current transaction

Trait Implementations§

impl Debug for TransactionManager

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

Formats the value using the given formatter. Read more

impl Default for TransactionManager

fn default() -> Self

Returns the “default value” for a type. Read more

Auto Trait Implementations§

impl UnwindSafe for TransactionManager

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

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Gets the TypeId of self. Read more

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where T: ?Sized,

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where T: ?Sized,

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Returns the argument unchanged.

impl<T, U> Into for T
where U: From<T>,

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That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

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