Struct MemoryTransaction 

pub struct MemoryTransaction {
    pub user_id: UserId,
    pub expected_revision: Option<u64>,
    pub writes: Vec<MemoryWrite>,
    pub idempotency_key: String,
}

An all-or-nothing set of writes against one user’s namespace.

A contradiction resolution writes two records — the new active fact and the superseded old one. Committing only one of them would leave the corpus asserting both, so transactions are the unit of commit.

Fields

user_id: UserId

Whose namespace is being written.

expected_revision: Option<u64>

The revision the caller read, if it is enforcing one.

writes: Vec<MemoryWrite>

The writes to apply, in order.

idempotency_key: String

Deduplication key so a retried commit is not applied twice.

Implementations

impl MemoryTransaction

pub fn new(user_id: UserId, idempotency_key: impl Into<String>) -> Self

An empty transaction for a user.

pub fn expecting(self, revision: u64) -> Self

Require the repository to still be at revision.

pub fn put(self, memory: CanonicalMemory) -> Self

Add a record write.

pub fn delete(self, id: MemoryId) -> Self

Add a deletion.

pub fn is_empty(&self) -> bool

Whether there is anything to do.

Trait Implementations

impl Clone for MemoryTransaction

fn clone(&self) -> MemoryTransaction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MemoryTransaction

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

Formats the value using the given formatter.