Struct Metadata 

pub struct Metadata {
    pub freq: u64,
    pub created_at: u64,
    pub ttl: Option<u64>,
}

Contains additional information about a key, such as its access frequency and lifecycle.

NOTE: This struct derives Serialize and Deserialize to be stored as raw bytes (&u8) in the underlying sled tree.

Fields

freq: u64

The number of time the key has been accessed

created_at: u64

Timestamp of key creation, in seconds since the UNIX epoch

ttl: Option<u64>

The key’s time-to-live in seconds. If None, the key is persistent and never expires.

Implementations

impl Metadata

pub fn new(ttl: Option<u64>) -> Metadata

Creates a new Metadata instance with an optional TTL.

The created_at timestamp is set to the current system time.

pub fn freq_incretement(self) -> Metadata

Increments the frequency counter.

pub fn freq_decretement(self) -> Metadata

Decrements the frequency counter.

pub fn to_u8(&self) -> Result<Vec<u8>, EncodeError>

Serializes the Metadata instance into a byte vector using bincode.

Errors

Returns an EncodeError if serialization fails.

pub fn from_u8(slice: &[u8]) -> Result<Metadata, DecodeError>

Deserializes a Metadata instance from a byte slice using bincode.

Errors

Returns a DecodeError if deserialization fails.

Trait Implementations

impl Debug for Metadata

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for Metadata

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl PartialEq for Metadata

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Serialize for Metadata

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for Metadata