Struct KeyMeta 

pub struct KeyMeta {
    pub rtype: RedisType,
    pub flags: u8,
    pub expire_at: u64,
    pub version: u64,
    pub size: u64,
}

Fundamental 26-byte metadata structure (aligned with Apache Kvrocks KeyMetadata). 基础通用 26 字节元数据结构（对标 Apache Kvrocks KeyMetadata）

Fields

rtype: RedisType

flags: u8

expire_at: u64

version: u64

size: u64

Implementations

impl KeyMeta

pub const META_64BIT_ENCODING_MASK: u8 = 0x80

pub const META_TYPE_MASK: u8 = 0x0F

pub const ENCODED_SIZE: usize = 26

pub const KVROCKS_COMPLEX_ENCODED_SIZE: usize = 25

pub const KVROCKS_SINGLE_KV_ENCODED_SIZE: usize = 9

pub const fn new( rtype: RedisType, expire_at: u64, version: u64, size: u64, ) -> Self

pub fn new_with_version(rtype: RedisType, expire_at: u64, size: u64) -> Self

pub const fn is_expired(&self, now_ms: u64) -> bool

pub const fn is_single_kv_type(&self) -> bool

pub const fn is_emptyable_type(&self) -> bool

pub const fn ttl(&self, now_ms: u64) -> i64

pub const fn ttl_ms(&self, now_ms: u64) -> i64

pub const fn ttl_sec(&self, now_ms: u64) -> i64

pub fn expire_at_ms_to_sec(ms: u64) -> u64

pub const fn is_64bit_encoded_flags(flags: u8) -> bool

pub const fn is_64bit_encoded(&self) -> bool

pub const fn common_encoded_size(&self) -> usize

pub const fn get_offset_after_expire(flags: u8) -> usize

Returns byte offset following expiration timestamp in encoded metadata. 获取元数据过期时间之后的字节偏移量（对标 Kvrocks Metadata::GetOffsetAfterExpire）

pub const fn get_offset_after_size(flags: u8) -> usize

Returns byte offset following size field in encoded metadata. 获取复合元数据大小之后的字节偏移量（对标 Kvrocks Metadata::GetOffsetAfterSize）

pub fn encode(&self) -> [u8; 26]

Encodes into standard 26-byte metadata header. 编码为标准 26 字节元数据头

pub fn encode_kvrocks(&self) -> Vec<u8>

Encodes into compact Kvrocks binary format (25-byte composite / 9-byte SingleKV). 编码为 Kvrocks 1:1 紧凑二进制格式（25字节复合类型 / 9字节SingleKV）

pub fn decode(bytes: &[u8]) -> Option<Self>

Decodes metadata header from binary slice. 解码元数据头（支持标准 26 字节头、25 字节复合结构头与 9 字节 SingleKV 头）

Trait Implementations

impl Clone for KeyMeta

fn clone(&self) -> KeyMeta

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for KeyMeta

impl Debug for KeyMeta

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

Formats the value using the given formatter.

impl<'__de> Decode<'__de> for KeyMeta

where '__de:,

impl Encode for KeyMeta

impl Eq for KeyMeta

impl PartialEq for KeyMeta

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for KeyMeta