示例#1
0
// Creates an iterator.
func (c *compaction) newIterator() iterator.Iterator {
	// Creates iterator slice.
	icap := len(c.tables)
	if c.level == 0 {
		// Special case for level-0
		icap = len(c.tables[0]) + 1
	}
	its := make([]iterator.Iterator, 0, icap)

	// Options.
	ro := &opt.ReadOptions{
		DontFillCache: true,
	}
	strict := c.s.o.GetStrict(opt.StrictIterator)

	for i, tables := range c.tables {
		if len(tables) == 0 {
			continue
		}

		// Level-0 is not sorted and may overlaps each other.
		if c.level+i == 0 {
			for _, t := range tables {
				its = append(its, c.s.tops.newIterator(t, nil, ro))
			}
		} else {
			it := iterator.NewIndexedIterator(tables.newIndexIterator(c.s.tops, c.s.icmp, nil, ro), strict, true)
			its = append(its, it)
		}
	}

	return iterator.NewMergedIterator(its, c.s.icmp, true)
}
示例#2
0
func (db *DB) newRawIterator(slice *util.Range, ro *opt.ReadOptions) iterator.Iterator {
	em, fm := db.getMems()
	v := db.s.version()

	ti := v.getIterators(slice, ro)
	n := len(ti) + 2
	i := make([]iterator.Iterator, 0, n)
	emi := em.mdb.NewIterator(slice)
	emi.SetReleaser(&memdbReleaser{m: em})
	i = append(i, emi)
	if fm != nil {
		fmi := fm.mdb.NewIterator(slice)
		fmi.SetReleaser(&memdbReleaser{m: fm})
		i = append(i, fmi)
	}
	i = append(i, ti...)
	strict := db.s.o.GetStrict(opt.StrictIterator) || ro.GetStrict(opt.StrictIterator)
	mi := iterator.NewMergedIterator(i, db.s.icmp, strict)
	mi.SetReleaser(&versionReleaser{v: v})
	return mi
}