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TxnState

flowlog_runtime::txn

Struct TxnState 

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pub struct TxnState {
    pub epoch: u32,
    pub action: TxnAction,
    pub pending: Vec<TxnOp>,
}
Expand description

Shared transaction snapshot. The driver mutates this behind an Arc<RwLock<_>>; workers clone the inner value each epoch.

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§epoch: u32

Broadcast indicator: incremented on each publish so workers can detect “new txn”.

§action: TxnAction

Broadcast indicator: what the workers should do for this epoch.

§pending: Vec<TxnOp>

Updates queued for the next commit.

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impl TxnState

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pub fn clear_pending(&mut self)

Clear the pending queue — used by drivers when starting or aborting a transaction.

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pub fn enqueue(&mut self, op: TxnOp)

Append one op to the pending queue.

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pub fn as_commit_snapshot(&self, next_epoch: u32) -> TxnState

Snapshot the current state as a Commit broadcast at next_epoch. Clones pending so the driver can keep its queue for rollback.

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pub fn as_quit_snapshot(next_epoch: u32) -> TxnState

Freestanding Quit snapshot — no carried pending ops.

Trait Implementations§

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impl Clone for TxnState

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fn clone(&self) -> TxnState

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 TxnState

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

Formats the value using the given formatter. Read more
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impl Default for TxnState

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fn default() -> TxnState

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

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

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fn type_id(&self) -> TypeId

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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

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

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fn into(self) -> U

Calls U::from(self).

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

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fn into_either(self, into_left: bool) -> Either<Self, Self>

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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impl<'a, S, T> Semigroup<&'a S> for T
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fn plus_equals(&mut self, rhs: &&'a S)

The method of std::ops::AddAssign, for types that do not implement AddAssign.
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

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impl<T, U> TryFrom<U> for T
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type Error = Infallible

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type Error = <U as TryFrom<T>>::Error

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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.