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UnstableChangeCallbacks

xmtp_mls::core::change_callbacks

Struct UnstableChangeCallbacks 

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pub struct UnstableChangeCallbacks {
    pub app_data: Option<Arc<dyn AppDataChangeCallback>>,
    pub app_data_timeout: Duration,
}
Expand description

The set of change callbacks registered on a client.

Cloned into LocalContext at build time; an unset field costs a single Option check on the message-processing path.

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§app_data: Option<Arc<dyn AppDataChangeCallback>>

Fires when a processed message changed the group’s app_data.

§app_data_timeout: Duration

How long Self::app_data may run before it is abandoned. Defaults to DEFAULT_APP_DATA_CALLBACK_TIMEOUT.

Deliberately not mirrored on the FFI registries yet: no SDK caller has asked to tune it, and exposing it costs a field on each of the uniffi, napi, and wasm records plus the SDK surfaces above them. It lives here so tests can shorten it, and so the knob is already additive the day someone does ask.

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impl UnstableChangeCallbacks

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pub fn watches_app_data(&self) -> bool

Whether anything is watching app_data. Gates the before/after snapshot in message processing so unregistered clients pay nothing.

Trait Implementations§

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impl Clone for UnstableChangeCallbacks

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fn clone(&self) -> UnstableChangeCallbacks

Returns a duplicate of the value. Read more
1.0.0 (const: unstable) · Source§

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

Performs copy-assignment from source. Read more
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impl Debug for UnstableChangeCallbacks

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

Formats the value using the given formatter. Read more
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impl Default for UnstableChangeCallbacks

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fn default() -> UnstableChangeCallbacks

Hand-written rather than derived: the derive would default app_data_timeout to Duration::ZERO, which expires every callback before it starts.

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