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twolayer.go
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twolayer.go
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package timeline
import (
"time"
)
type MemoryAndSqliteCacheOptions[Data any, Key any, ID comparable] struct {
SqliteCacheOptions[Data, Key, ID]
MinFirstLayerFetchPeriod time.Duration
}
func NewMemoryAndSqliteCache[Data any, Key any, ID comparable](opts MemoryAndSqliteCacheOptions[Data, Key, ID]) (*MemoryAndSqliteCache[Data, Key, ID], error) {
sqliteCache, err := NewSqliteCache[Data, Key, ID](opts.SqliteCacheOptions)
if err != nil {
return nil, err
}
c := &MemoryAndSqliteCache[Data, Key, ID]{
minFirstLayerFetchPeriod: opts.MinFirstLayerFetchPeriod,
sqliteCache: sqliteCache,
}
c.MemoryCache = *NewMemoryCache[Data, Key](MemoryCacheOptions[Data, Key]{
KeyToStr: opts.KeyToStr,
GetTimestamp: opts.GetTimestamp,
GetFromSource: c.getFromSecondLayer,
SkipDataVerification: opts.SkipDataVerification,
})
return c, nil
}
type MemoryAndSqliteCache[Data any, Key any, ID comparable] struct {
MemoryCache[Data, Key]
sqliteCache *SqliteCache[Data, Key, ID]
minFirstLayerFetchPeriod time.Duration
}
var _ Cache[struct{}, int64] = &MemoryAndSqliteCache[struct{}, int64, string]{}
func (c *MemoryAndSqliteCache[Data, Key, ID]) getFromSecondLayer(key Key, periodStart, periodEnd time.Time, closestFromStart, closestFromEnd *Data, extra interface{}) (CacheStateSegment[Data], error) {
forwardFetchPeriodStart := periodStart
forwardFetchPeriodEnd := periodEnd
requestedPeriodDuration := periodEnd.Sub(periodStart)
if requestedPeriodDuration < c.minFirstLayerFetchPeriod {
requestedPeriodCenter := periodStart.Add(requestedPeriodDuration / 2)
forwardFetchPeriodStart = requestedPeriodCenter.Add(-c.minFirstLayerFetchPeriod / 2)
forwardFetchPeriodEnd = requestedPeriodCenter.Add(c.minFirstLayerFetchPeriod / 2)
}
cachedInSecondLayer, isCached, err := c.sqliteCache.GetCachedAll(key, periodStart, periodEnd, forwardFetchPeriodStart, forwardFetchPeriodEnd)
if err != nil {
return CacheStateSegment[Data]{}, err
}
if isCached {
return cachedInSecondLayer, nil
}
// TODO: GetFresh instead of Get
// TODO: GetAll(s, e, min,max) instead of Get
data, err := c.sqliteCache.Get(key, periodStart, periodEnd, extra)
if err != nil {
return CacheStateSegment[Data]{}, err
}
return CacheStateSegment[Data]{
PeriodStart: periodStart,
PeriodEnd: periodEnd,
Data: data,
}, nil
}