Method getValueByCV

db/revision_cache_lru.go:423–452

(ctx context.Context, docID string, cv *Version, collectionID uint32, create bool)

}

func (rc *LRURevisionCache) getValueByCV(ctx context.Context, docID string, cv *Version, collectionID uint32, create bool) (value *revCacheValue) {
	if docID == "" || cv == nil {
		return nil
	}

	key := IDandCV{DocID: docID, Source: cv.SourceID, Version: cv.Value, CollectionID: collectionID}
	rc.lock.Lock()
	defer rc.lock.Unlock()
	if elem := rc.hlvCache[key]; elem != nil {
		rc.lruList.MoveToFront(elem)
		value = elem.Value.(*revCacheValue)
	} else if create {
		value = &revCacheValue{id: docID, cv: *cv, collectionID: collectionID}
		value.canEvict.Store(false)
		newElem := rc.lruList.PushFront(value)
		rc.hlvCache[key] = newElem
		rc.cacheNumItems.Add(1)

		// evict if over number capacity
		numItemsRemoved, numBytesEvicted := rc._numberCapacityEviction()
		if numBytesEvicted > 0 {
			rc._decrRevCacheMemoryUsage(ctx, -numBytesEvicted)
		}

		if numItemsRemoved > 0 {
			rc.cacheNumItems.Add(-numItemsRemoved)
		}
	}
	return
}

// addToRevMapPostLoad will generate and entry in the Rev lookup map for a new document entering the cache
func (rc *LRURevisionCache) addToRevMapPostLoad(ctx context.Context, docID, revID string, cv *Version, collectionID uint32) {