Struct PgCursor 

pub struct PgCursor {
    pub sequence: i64,
    pub partition: Partition,
}

Fields

sequence: i64

partition: Partition

Implementations

impl PgCursor

pub fn new(sequence: i64, partition: Partition) -> Self

pub fn sequence(&self) -> i64

pub fn partition(&self) -> Partition

impl PgCursor

pub fn codec() -> Result<JsonCursorCodec<Self>>

Trait Implementations

impl Clone for PgCursor

fn clone(&self) -> PgCursor

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for PgCursor

impl Cursor for PgCursor

fn order_key(&self) -> CursorOrder

fn id(&self) -> CursorId

impl Debug for PgCursor

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PgCursor

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for PgCursor

impl HasPartition for PgCursor

fn partition(&self) -> Partition

impl Hash for PgCursor

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for PgCursor

fn cmp(&self, other: &PgCursor) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for PgCursor

fn eq(&self, other: &PgCursor) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for PgCursor

fn partial_cmp(&self, other: &PgCursor) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl PartitionCoordinator<PgCursor> for PgPartitionCoordinator

async fn heartbeat<'a>( &'a self, scope: &'a CheckpointScope, owner_id: &'a OwnerId, lease_duration: Duration, ) -> Result<()>

async fn live_consumers<'a>( &'a self, scope: &'a CheckpointScope, ) -> Result<usize>

async fn release_consumer<'a>( &'a self, scope: &'a CheckpointScope, owner_id: &'a OwnerId, ) -> Result<()>

Remove this consumer’s registration so other consumers stop counting it as live when computing target_partition_count. Called by CoordinatedReader on stream shutdown. Should be idempotent and must not return an error when the consumer record is missing.

async fn claim<'a>( &'a self, scope: &'a CheckpointScope, owner_id: &'a OwnerId, partition: Partition, lease_duration: Duration, ) -> Result<Option<PartitionLease<PgCursor>>>

Attempt to take a partition. Returns Ok(Some(lease)) on success or Ok(None) if another live owner holds it. Increments generation on every successful claim.

async fn renew<'a>( &'a self, lease: &'a PartitionLease<PgCursor>, lease_duration: Duration, ) -> Result<()>

Extend lease_until only if (owner_id, generation) still matches. Returns Err(Error::OwnershipLost(_)) on mismatch.

async fn release<'a>( &'a self, lease: &'a PartitionLease<PgCursor>, ) -> Result<()>

Clear owner_id and lease_until only if (owner_id, generation) matches. Increments generation. Returns Err(Error::OwnershipLost(_)) on mismatch.

async fn checkpoint<'a>( &'a self, lease: &'a PartitionLease<PgCursor>, cursor: PgCursor, ) -> Result<()>

Write cursor only if (owner_id, generation) matches. The update is monotonic via Cursor::order_key(). Returns Err(Error::OwnershipLost(_)) on mismatch.

impl PartitionableSubscription<PgCursor> for PgSubscription

fn with_partitions(self, group: PartitionGroup) -> Self

Restrict this subscription to a validated group of partitions sharing the same partition_count. The reader emits a single SQL query per poll using partition_id = ANY($::bigint[]) instead of one query per partition. Single-partition uses fall through the default trait impl which wraps in a singleton group; partition_id = ANY(ARRAY[$1]) plans identically to partition_id = $1 on modern Postgres.

fn with_partition(self, partition: Partition) -> Self

where Self: Sized,

Restrict the subscription to a single partition. The default impl wraps the partition in a singleton PartitionGroup and delegates to PartitionableSubscription::with_partitions. Backends override only when a single-partition path is materially cheaper than the multi-partition path (rare).

impl Serialize for PgCursor

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StartableSubscription<PgCursor> for PgSubscription

fn with_start(self, start: StartFrom<PgCursor>) -> Self

fn with_starts(self, starts: Vec<StartFrom<C>>) -> Self

where C: Ord,

Seed this subscription with a collection of candidate start positions. Default behavior: pick the smallest StartFrom::After(c) from the vec and delegate to with_start. Other variants (Earliest, Latest, Timestamp) are ignored by the default impl — readers that support fan-in, dual historic+live consumption, or topology-aware resume must override.

impl StructuralPartialEq for PgCursor