Struct Headers 

pub struct Headers;

The delivery’s headers, read from one column: set by InboxSpec::headers.

Examples

use std::collections::BTreeMap;

use chrono::{DateTime, Utc};
use ruststream_sqlx::dialect::Column;
use ruststream_sqlx::spec::{Headers, Lease, Payload};
use ruststream_sqlx::{HeaderRow, InboxSpec, InboxTable};
use sqlx::types::Json;

#[derive(sqlx::FromRow)]
pub struct Relay {
    id: i64,
    headers: Json<BTreeMap<String, String>>,
    payload: Vec<u8>,
}

impl InboxTable for Relay {
    type Id = i64;
    // The headers a relayed message carried come back from the `headers` JSON column.
    type Table = InboxSpec<(Lease<DateTime<Utc>>, Headers, Payload)>;
    const TABLE: Self::Table = InboxSpec::new("relay", Column::new("id").generated())
        .lease(Column::new("locked_until"))
        .headers(Column::new("headers"))
        .payload(Column::new("payload"));

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

impl HeaderRow for Relay {
    type Column = Json<BTreeMap<String, String>>;

    fn headers_mut(&mut self) -> &mut Self::Column {
        &mut self.headers
    }
}

Trait Implementations

impl Debug for Headers

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

Formats the value using the given formatter.

impl Declaration for Headers

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 = Set<Headers>

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 = 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.