Golang Collection.Write Examples

Example #1

File: compact.go Project: scottcagno/cbgb

func copyColl(srcColl *gkvlite.Collection, dstColl *gkvlite.Collection,
	writeEvery int) (numItems uint64, lastItem *gkvlite.Item, err error) {
	minItem, err := srcColl.MinItem(true)
	if err != nil {
		return 0, nil, err
	}
	if minItem == nil {
		return 0, nil, nil
	}

	var errVisit error = nil
	err = srcColl.VisitItemsAscend(minItem.Key, true, func(i *gkvlite.Item) bool {
		if errVisit = dstColl.SetItem(i); errVisit != nil {
			return false
		}
		numItems++
		lastItem = i
		if writeEvery > 0 && numItems%uint64(writeEvery) == 0 {
			if errVisit = dstColl.Write(); errVisit != nil {
				return false
			}
		}
		return true
	})
	if err != nil {
		return 0, nil, err
	}
	if errVisit != nil {
		return 0, nil, errVisit
	}

	return numItems, lastItem, nil
}