Struct Discard 

pub struct Discard;

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

Examples

use ruststream_sqlx::dialect::Column;
use ruststream_sqlx::spec::{Payload, own};
use ruststream_sqlx::{Discard, InboxSpec, InboxTable};
use sqlx::{PgConnection, Postgres};

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

impl InboxTable for Comment {
    type Id = i64;
    type Table = InboxSpec<(Payload, own::Discard)>;
    const TABLE: Self::Table = InboxSpec::new("comments", Column::new("id").generated())
        .payload(Column::new("payload"))
        .own::<own::Discard>();

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

// A rejected comment moves to `rejected_comments`, stamped with the time of the rejection.
impl Discard<Postgres> for Comment {
    async fn discard(conn: &mut PgConnection, id: &i64) -> Result<(), sqlx::Error> {
        sqlx::query(
            "WITH gone AS (DELETE FROM comments WHERE id = $1 RETURNING id, payload) \
             INSERT INTO rejected_comments (id, payload, rejected_at) \
             SELECT id, payload, now() FROM gone",
        )
        .bind(id)
        .execute(conn)
        .await?;
        Ok(())
    }
}

Trait Implementations

impl Debug for Discard

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

Formats the value using the given formatter.

impl Declaration for Discard

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 = Set<Discard>

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

type OwnDeadLetter = Unset

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

type OwnExtend = Unset

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 Discard