Struct Key 

pub struct Key;

Reads the record key, when present.

The owned form is the delivery’s own buffer: the first read promotes it to a shared block, one allocation per delivery, and every read after that is a reference count.

Trait Implementations

impl Clone for Key

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl ContextField for Key

type Context = KafkaContext

The per-delivery context type this key reads from.

type Value = Option<Bytes>

The owned value the key yields.

fn read(self, src: &KafkaContext) -> Option<Bytes>

Reads this key’s field out of src. Named apart from Field::get so a key implementing both traits stays unambiguous to call.

impl Copy for Key

impl Debug for Key

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

Formats the value using the given formatter.

impl Default for Key

fn default() -> Self

Returns the “default value” for a type.

impl Eq for Key

impl Field<KafkaContext> for Key

type Value<'a> = Option<&'a [u8]>

The value read through this key, borrowed from the source for 'a.

fn get(self, src: &KafkaContext) -> Option<&[u8]>

Reads this key’s field out of src.

impl PartialEq for Key

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Key