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package ingest
import (
"codeberg.org/lindenii/furgit/internal/lru"
objecttype "codeberg.org/lindenii/furgit/object/type"
)
// deltaBaseCacheKey identifies one resolved base by record index.
type deltaBaseCacheKey struct {
recordIdx int
}
// deltaBaseCacheValue stores one resolved base object payload.
type deltaBaseCacheValue struct {
realType objecttype.Type
content []byte
}
// deltaBaseCache is a bounded LRU for resolved base payloads.
type deltaBaseCache struct {
lru *lru.Cache[deltaBaseCacheKey, deltaBaseCacheValue]
}
// newDeltaBaseCache creates one bounded base cache.
func newDeltaBaseCache(maxBytes int64) *deltaBaseCache {
return &deltaBaseCache{
lru: lru.New(
maxBytes,
func(_ deltaBaseCacheKey, value deltaBaseCacheValue) int64 {
return int64(len(value.content))
},
nil,
),
}
}
// get returns one cache entry for recordIdx.
func (cache *deltaBaseCache) get(recordIdx int) (objecttype.Type, []byte, bool) {
value, ok := cache.lru.Get(deltaBaseCacheKey{recordIdx: recordIdx})
if !ok {
return objecttype.TypeInvalid, nil, false
}
return value.realType, value.content, true
}
// add stores one cache entry for recordIdx.
func (cache *deltaBaseCache) add(recordIdx int, realType objecttype.Type, content []byte) {
cache.lru.Add(deltaBaseCacheKey{recordIdx: recordIdx}, deltaBaseCacheValue{
realType: realType,
content: content,
})
}
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