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ConsumerConfig

arminius_lib_nats::config

Struct ConsumerConfig 

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pub struct ConsumerConfig {
    pub ack_wait: Duration,
    pub max_ack_pending: Option<i64>,
    pub max_deliver: Option<i64>,
    pub stream_buffer_size: Option<usize>,
    pub command_prefetch: NonZeroUsize,
}
Expand description

Controls JetStream consumer behaviour: acknowledgment window, backpressure, poison-pill protection, and internal buffer sizes.

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§ack_wait: Duration

How long the server waits for an ack before redelivering the message. Default: 30 s.

§max_ack_pending: Option<i64>

Maximum in-flight (unacked) messages. None uses the NATS default (1 000). Set lower to apply backpressure on slow consumers.

Defaults to DEFAULT_MAX_ACK_PENDING.

§max_deliver: Option<i64>

Maximum delivery attempts per message. None means unlimited retries. Set to a small number to drop poison-pill messages automatically.

Defaults to DEFAULT_MAX_DELIVER, leaving it unlimited would turn a message no consumer can handle into an endless redelivery loop.

Overridden to 1 for a command declaring Delivery::AtMostOnce: such a command is acknowledged before it is handled, so any redelivery would mean the handler ran twice, whatever this is set to.

§stream_buffer_size: Option<usize>

Capacity of the internal mpsc channel used by the auto-reconnect task. None falls back to 1 000.

§command_prefetch: NonZeroUsize

How many commands one responder pulls ahead of handling them. Keep it small so idle instances get the queued ones. Defaults to DEFAULT_COMMAND_PREFETCH.

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impl ConsumerConfig

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pub fn buffer_size(&self) -> usize

Capacity of the channel between a subscription’s background forward task and its consumer-facing stream, falling back to DEFAULT_STREAM_BUFFER_SIZE.

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pub(crate) fn pull_config( &self, durable_name: String, filter_subjects: Vec<String>, ) -> Config

Builds a durable JetStream pull-consumer config for durable_name, filtering on filter_subjects, with this struct’s tuning applied (ack window, backpressure, poison-pill limit). None limits keep the async-nats defaults.

All subjects go in filter_subjects (requires NATS 2.10+, which the connection mandates). deliver_policy is All; ack_policy stays at the async-nats default (Explicit, as required for pull consumers).

The in-flight limit is capped at buffer_size. The two are separate fields, so shrinking the buffer alone would otherwise let the broker deliver more than the client can hold, and the surplus would be dropped and redelivered purely because of backpressure.

Trait Implementations§

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impl Clone for ConsumerConfig

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fn clone(&self) -> ConsumerConfig

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 ConsumerConfig

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

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

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fn default() -> Self

Returns the “default value” for a type. Read more

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Change the background color to red
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Change the foreground color to green
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Change the background color to green
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Change the foreground color to yellow
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Change the background color to yellow
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Change the foreground color to purple
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Change the background color to purple
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Change the foreground color to cyan
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Change the background color to cyan
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Change the foreground color to white
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Change the background color to white
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Change the background color to bright magenta
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Change the foreground color to bright purple
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Change the background color to bright purple
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Change the foreground color to bright cyan
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Change the foreground color to bright white
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Make the text bold
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Make the text dim
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Cross out the text
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Set the background color to a specific RGB value.
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Sets the foreground color to an RGB value.
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Sets the background color to an RGB value.
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Apply a runtime-determined style
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