pub struct BatchCursor { /* private fields */ }Expand description
A cursor for preparing a group-commit batch against an evolving in-memory
value without touching the live one. Each Self::prepare validates
against the effects of the earlier transactions in the batch (uniqueness,
cardinality-one retraction, CAS), so a batch commits with exactly the
semantics of committing the transactions one at a time. The caller makes
the batch’s records durable, then publishes the cursor with
EmbeddedTransactor::install_batch; a batch that never installs leaves
the live value untouched.
Implementations§
Source§impl BatchCursor
impl BatchCursor
Sourcepub fn db(&self) -> &Db
pub fn db(&self) -> &Db
The value including every transaction prepared into this batch so far, for expanding and converting the next transaction against it.
Sourcepub fn prepare(
&mut self,
items: impl IntoIterator<Item = TxItem>,
now_ms: i64,
) -> Result<Prepared, TxError>
pub fn prepare( &mut self, items: impl IntoIterator<Item = TxItem>, now_ms: i64, ) -> Result<Prepared, TxError>
Prepares one transaction against the cursor, advancing the cursor’s
in-memory value by it. now_ms is the wall clock in Unix milliseconds;
:db/txInstant stays monotone via max(now, last + 1). On error the
cursor is unchanged, so a rejected transaction leaves the rest of the
batch unaffected.
§Errors
Returns TxError when the transaction fails resolution or validation.
Auto Trait Implementations§
impl Freeze for BatchCursor
impl RefUnwindSafe for BatchCursor
impl Send for BatchCursor
impl Sync for BatchCursor
impl Unpin for BatchCursor
impl UnsafeUnpin for BatchCursor
impl UnwindSafe for BatchCursor
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