Struct CacheCodec 

pub struct CacheCodec { /* private fields */ }

Type-erased codec for serializing and deserializing cache entries.

CacheCodec carries the entry’s stable type_id/version plus two plain function pointers — it is Copy and has no heap allocation. Construct one via CacheCodec::from_impl for types that implement CacheCodecImpl, or CacheCodec::new for custom cases (e.g. when the orphan rule prevents a direct impl).

Implementations

impl CacheCodec

pub fn new( type_id: &'static str, version: u32, serialize_body: fn(&Arc<dyn Any + Send + Sync>, &mut CacheEntryWriter<'_>) -> Result<()>, deserialize_body: fn(&mut CacheEntryReader<'_>) -> Result<Arc<dyn Any + Send + Sync>>, ) -> Self

Create a CacheCodec from explicit body function pointers.

Prefer from_impl when the value type implements CacheCodecImpl. Use this for types where a direct impl isn’t possible (e.g. the orphan rule prevents it). type_id and version play the same role as the corresponding CacheCodecImpl constants.

pub fn from_impl<T: CacheCodecImpl + 'static>() -> Self

Create a CacheCodec from a CacheCodecImpl implementation.

pub fn serialize( &self, value: &Arc<dyn Any + Send + Sync>, writer: &mut dyn Write, ) -> Result<()>

Serialize value into writer: envelope first, then the body.

pub fn deserialize( &self, data: &Bytes, ) -> CacheDecode<Arc<dyn Any + Send + Sync>>

Deserialize an entry from data.

Never fails: any non-fatal failure to interpret the bytes becomes a CacheDecode::Miss with the reason why (see CacheMissReason). Reading from an in-memory Bytes cannot do I/O, so there is no fault channel — a miss is the only non-Hit outcome.

Trait Implementations

impl Clone for CacheCodec

fn clone(&self) -> CacheCodec

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for CacheCodec

impl Debug for CacheCodec

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

Formats the value using the given formatter.