Struct ChannelConfig 

#[non_exhaustive]
pub struct ChannelConfig {
    pub name: String,
    pub schema: Schema,
    pub mode: ChannelMode,
    pub pressure: ChannelPressureConfig,
}

Required configuration for creating a typed channel.

SEMVER — this type takes a declared break in the next publish wave. A1 added the pressure field, and adding a field to a struct with public fields breaks every out-of-crate struct-literal construction (ChannelConfig { name, schema, mode } no longer compiles). There is no version of “carry a per-channel pressure policy on the config” that avoids it, so it is declared rather than hidden — see docs/design/A1-DEFER-WIRING-RECORD-2026-09-01.md §6.

#[non_exhaustive] is added in the SAME wave, deliberately: the break is already being paid, and it buys the property that no future field costs one again. Out-of-crate construction goes through Self::new plus the with_* builders, which is what every construction site in this workspace already does. Reading a field is unaffected.

Fields (Non-exhaustive)

Non-exhaustive structs could have additional fields added in future. Therefore, non-exhaustive structs cannot be constructed in external crates using the traditional Struct { .. } syntax; cannot be matched against without a wildcard ..; and struct update syntax will not work.

name: String

Explicit channel name.

schema: Schema

Explicit schema for validating published payloads.

mode: ChannelMode

Explicit durability mode for the channel.

pressure: ChannelPressureConfig

A1 pressure policy for this channel: the Defer delay-hint band and the durable pre-append hard watermark. Defaulted by Self::new, so no existing construction site changes; overridden with Self::with_pressure.

Implementations

impl ChannelConfig

pub const fn new(name: String, schema: Schema, mode: ChannelMode) -> Self

Creates channel configuration from its required fields, with the default A1 pressure policy.

pub const fn with_pressure(self, pressure: ChannelPressureConfig) -> Self

Replaces this channel’s A1 pressure policy.

Trait Implementations

impl Clone for ChannelConfig

fn clone(&self) -> ChannelConfig

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChannelConfig

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

Formats the value using the given formatter.