示例#1
0
func TestBatch_Size(t *testing.T) {
	b := new(Batch)
	for i := 0; i < 2; i++ {
		b.Put([]byte("key1"), []byte("value1"))
		b.Put([]byte("key2"), []byte("value2"))
		b.Delete([]byte("key1"))
		b.Put([]byte("foo"), []byte("foovalue"))
		b.Put([]byte("bar"), []byte("barvalue"))
		mem := memdb.New(&iComparer{comparer.DefaultComparer}, 0)
		b.memReplay(mem)
		if b.size() != mem.Size() {
			t.Errorf("invalid batch size calculation, want=%d got=%d", mem.Size(), b.size())
		}
		b.Reset()
	}
}
示例#2
0
// Create new memdb and froze the old one; need external synchronization.
// newMem only called synchronously by the writer.
func (db *DB) newMem(n int) (mem *memDB, err error) {
	num := db.s.allocFileNum()
	file := db.s.getJournalFile(num)
	w, err := file.Create()
	if err != nil {
		db.s.reuseFileNum(num)
		return
	}

	db.memMu.Lock()
	defer db.memMu.Unlock()

	if db.frozenMem != nil {
		panic("still has frozen mem")
	}

	if db.journal == nil {
		db.journal = journal.NewWriter(w)
	} else {
		db.journal.Reset(w)
		db.journalWriter.Close()
		db.frozenJournalFile = db.journalFile
	}
	db.journalWriter = w
	db.journalFile = file
	db.frozenMem = db.mem
	mdb := db.mpoolGet()
	if mdb == nil || mdb.Capacity() < n {
		mdb = memdb.New(db.s.icmp, maxInt(db.s.o.GetWriteBuffer(), n))
	}
	mem = &memDB{
		db:  db,
		mdb: mdb,
		ref: 2,
	}
	db.mem = mem
	// The seq only incremented by the writer. And whoever called newMem
	// should hold write lock, so no need additional synchronization here.
	db.frozenSeq = db.seq
	return
}