Struct Extend 

pub struct Extend;

The service’s own Extend: set by InboxSpec::own.

Examples

use chrono::{DateTime, Utc};
use ruststream_sqlx::dialect::Column;
use ruststream_sqlx::spec::{Lease, Payload, own};
use ruststream_sqlx::{Extend, InboxSpec, InboxTable};
use sqlx::{PgConnection, Postgres};

#[derive(sqlx::FromRow)]
pub struct Transcode {
    id: i64,
    payload: Vec<u8>,
}

impl InboxTable for Transcode {
    type Id = i64;
    type Table = InboxSpec<(Lease<DateTime<Utc>>, Payload, own::Extend)>;
    const TABLE: Self::Table = InboxSpec::new("transcodes", Column::new("id").generated())
        .lease(Column::new("locked_until"))
        .payload(Column::new("payload"))
        .own::<own::Extend>();

    fn id(&self) -> &i64 {
        &self.id
    }
}

// Each extension also counts in `extensions`, which shows a transcode that runs too long.
impl Extend<Postgres> for Transcode {
    async fn extend(
        conn: &mut PgConnection,
        id: &i64,
        held: &DateTime<Utc>,
        until: &DateTime<Utc>,
    ) -> Result<bool, sqlx::Error> {
        let extended = sqlx::query(
            "UPDATE transcodes SET locked_until = $1, extensions = extensions + 1 \
             WHERE id = $2 AND locked_until = $3",
        )
        .bind(until)
        .bind(id)
        .bind(held)
        .execute(conn)
        .await?;
        Ok(extended.rows_affected() == 1)
    }
}

Trait Implementations

impl Debug for Extend

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

Formats the value using the given formatter.

impl Declaration for Extend

type Form = Unset

The form: Lease or Advisory; unset for the row lock form.

type Message = Unset

The message mode: Payload; unset for row mode.

type Key = Unset

The partition key: Key.

type Attempt = Unset

The attempt count: Attempt.

type Headers = Unset

The delivery’s headers: Headers or HeaderFields.

type RetryAfter = Unset

The time a retried row is due: RetryAfter.

type ProcessedAt = Unset

The time a row was processed: ProcessedAt.

type Clock = Unset

The clock: Clock; unset for SystemClock.

type Opening = Unset

What the table’s transactions open at: Opens; unset for the database’s default.

type Fifo = Unset

Groups kept in order: Fifo.

type OwnClaim = Unset

The service’s own claim: own::Claim.

type OwnFetch = Unset

The service’s own fetch: own::Fetch.

type OwnAck = Unset

The service’s own ack: own::Ack.

type OwnRetry = Unset

The service’s own retry: own::Retry.

type OwnRetryAfter = Unset

The service’s own delayed retry: own::RetryAfter.

type OwnDiscard = Unset

The service’s own discard: own::Discard.

type OwnDeadLetter = Unset

The service’s own dead letter: own::DeadLetter.

type OwnExtend = Set<Extend>

The service’s own lease extension: own::Extend.

type OwnLock = Unset

The service’s own lock: own::Lock.

type OwnUnlock = Unset

The service’s own unlock: own::Unlock.

impl OwnEvent for Extend