Enum BlockHint 

pub enum BlockHint {
    None,
    Block {
        kind: BlockKind,
        keys: Vec<Vec<u8>>,
        timeout_ms: u64,
    },
}

How a command wants to block, if at all. Returned by Commands::resolve inside crate::ResolvedCmd so the verb-table lookup happens once per command. None is the zero-cost default for every non-blocking verb (≥ 99.9 % of dispatches in steady state).

keys is every key the conn watches (≥ 1). The dispatcher picks the park strategy from them:

• single key on the conn’s own shard → the in-shard fast path (BlockedClients): register + wake without any cross-core hop.
• single remote key, or any multi-key form → the cross-shard arbiter (block_xshard): the conn parks on its origin shard and watch registrations fan out to each key’s owning shard.

For BLPOP / BRPOP the keys are list keys; for XREAD BLOCK / XREADGROUP BLOCK they are the STREAMS keys (in request order).

Variants

None

Block

Fields

kind: BlockKind

keys: Vec<Vec<u8>>

timeout_ms: u64

0 = block forever (Redis convention). Anything else is the wall-clock millis the dispatcher will add to unix_now_ms() to derive the waiter’s deadline_ms.

Trait Implementations

impl Clone for BlockHint

fn clone(&self) -> BlockHint

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BlockHint

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

Formats the value using the given formatter.

impl Default for BlockHint

fn default() -> BlockHint

Returns the “default value” for a type.