Method removeValue

db/revision_cache_lru.go:597–618

removeValue removes a value from the revision cache, if present and the value matches the the value. If there's an item in the revision cache with a matching docID and revID but the document is different, this item will not be removed from the rev cache.

(value *revCacheValue, collectionID uint32)

// removeValue removes a value from the revision cache, if present and the value matches the the value. If there's an item in the revision cache with a matching docID and revID but the document is different, this item will not be removed from the rev cache.
func (rc *LRURevisionCache) removeValue(value *revCacheValue, collectionID uint32) {
	rc.lock.Lock()
	defer rc.lock.Unlock()
	revKey := IDAndRev{DocID: value.id, RevID: value.revID, CollectionID: collectionID}
	var itemRemoved bool
	if element := rc.cache[revKey]; element != nil && element.Value == value {
		rc.lruList.Remove(element)
		delete(rc.cache, revKey)
		itemRemoved = true
	}
	// need to also check hlv lookup cache map
	hlvKey := IDandCV{DocID: value.id, Source: value.cv.SourceID, Version: value.cv.Value, CollectionID: collectionID}
	if element := rc.hlvCache[hlvKey]; element != nil && element.Value == value {
		rc.lruList.Remove(element)
		delete(rc.hlvCache, hlvKey)
		itemRemoved = true
	}

	if itemRemoved {
		rc.cacheNumItems.Add(-1)
	}
}

// _numberCapacityEviction will iterate removing the last element in cache til we fall below the maximum number of items
// threshold for this shard, retuning the bytes evicted and number of items evicted