Struct MailboxBytes 

pub struct MailboxBytes(/* private fields */);

Byte budget for one flow’s inbox, enforced alongside MailboxCapacity.

Why a hop count is not a memory bound

MailboxCapacity bounds how many hops an inbox holds. Since ABI v4 a hop may carry crate::Value::Str / crate::Value::Bytes, and the .bf decoder accepts blobs up to 1 MiB, so “256 hops” is anywhere from ~12 KiB of scalars to ~256 MiB of blobs. A count alone therefore does not bound RSS — which is the whole point of bounding the mailbox.

Cost per hop comes from crate::Value::memory_size; read its doc for why Arc-shared payloads are deliberately over-charged.

Choosing the default

DEFAULT is 4 MiB, which must stay strictly greater than the largest single hop the .bf decoder will produce (MAX_BLOB in crate::decode’s module, 1 MiB) plus its envelope. A budget equal to the maximum payload size would make a legal, decodable constant permanently undeliverable under the default config — a bound should refuse abuse, not valid inputs. byte_budget_default_fits_one_max_hop guards that relationship.

MIN = 1 KiB (an inbox that cannot hold a handful of scalar hops is not an inbox). MAX = 1 GiB is a hard ceiling, not a recommendation.

Implementations

impl MailboxBytes

pub const MIN: usize

pub const MAX: usize

pub const DEFAULT: MailboxBytes

Default byte budget used by super::MailboxConfig::DEFAULT: 4 MiB. See the type doc for why it is not 1 MiB.

pub const fn new(value: usize) -> Option<Self>

Some iff value is in MIN..=MAX.

pub const fn get(self) -> usize

Trait Implementations

impl Clone for MailboxBytes

fn clone(&self) -> MailboxBytes

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for MailboxBytes

impl Debug for MailboxBytes

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

Formats the value using the given formatter.

impl Default for MailboxBytes

fn default() -> Self

Returns the “default value” for a type.

impl Eq for MailboxBytes

impl Hash for MailboxBytes

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Ord for MailboxBytes

fn cmp(&self, other: &MailboxBytes) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for MailboxBytes

fn eq(&self, other: &MailboxBytes) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl PartialOrd for MailboxBytes

fn partial_cmp(&self, other: &MailboxBytes) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StructuralPartialEq for MailboxBytes