Ejemplo n.º 1
0
func (e *segmentEntry) write(writer typedio.Writer) (err os.Error) {
	err = writer.WriteUint64(e.position) // position
	if err != nil {
		return err
	}

	buf := gsbuffer.New()
	err = e.mutation.serialize(buf)
	if err != nil {
		return err
	}

	e.mutsize = uint32(buf.Size)

	err = writer.WriteUint16(uint16(e.token)) // token
	if err != nil {
		return err
	}

	err = writer.WriteUint32(e.mutsize) // size of mutation
	if err != nil {
		return err
	}

	buf.Seek(0, 0)
	written, err := writer.Write(buf.Bytes()) // mutation
	if err != nil {
		return err
	}
	if written != int(e.mutsize) {
		return os.NewError(fmt.Sprintf("Couldn't write the whole mutation entry! Written %d of %d", written, e.mutsize))
	}

	return
}
Ejemplo n.º 2
0
func (cl *CommitLog) Execute(mutation Mutation) {
	typ := reflect.TypeOf(mutation)
	mutInfo, found := cl.mutationsType[typ]

	if !found {
		log.Fatal("CommitLog: Tried to execute an unknown mutation: %s of type %s", mutation, typ)
	}

	// write the modification into a buffer
	buf := buffer.New()
	buf.WriteUint8(mutInfo.id)   // mutation id
	mutation.Serialize(buf)      // mutation record
	buf.WriteInt64(buf.Size + 8) // record length

	// write record to disk
	buf.Seek(0, 0)
	cl.fdMutex.Lock()
	cl.fd.Seek(cl.writePtr, 0)
	io.Copyn(cl.fd, buf, buf.Size)

	// update commit log write pointer
	cl.fd.Seek(HEADER_WRITE_POS, 0)
	cl.writePtr += buf.Size
	cl.typedFd.WriteInt64(cl.writePtr)
	cl.fdMutex.Unlock()

	// execute the mutation
	mutation.Execute()
}
Ejemplo n.º 3
0
func TestResize(t *testing.T) {
	buffer := buffer.New()
	buffer.Write([]byte{1, 2, 3})
	buffer.Seek(1, 0)

	buffer.Write([]byte{7, 7, 7})

	if buffer.Size != 4 {
		t.Errorf("Should have resized to 4, but size is now %d", buffer.Size)
	}

	buf := make([]byte, 4)
	n, _ := buffer.Read(buf)
	if n != 0 {
		t.Errorf("Pointer was at the end, shouldn't have read anything but had %d bytes returned", n)
	}

	buffer.Seek(1, 0)
	n, _ = buffer.Read(buf)
	if n != 3 {
		t.Errorf("Should have read 4, but returned %d", n)
	}

	if string(buf) != string([]byte{7, 7, 7, 0}) {
		t.Errorf("Should have read 7 7 7 0, but got %s", buf)
	}
}
Ejemplo n.º 4
0
func TestWriteRead(t *testing.T) {
	buff := buffer.New()

	buff.Write([]byte{1, 3, 1})

	if buff.Size != 3 {
		t.Errorf("Buffer size should be 3, got %d", buff.Size)
	}

	if buff.Pointer != 3 {
		t.Errorf("Pointer should be at 3, got %d", buff.Pointer)
	}

	buff.Seek(0, 0)

	if buff.Pointer != 0 {
		t.Errorf("Pointer should bt at 0 after seek, got %d", buff.Pointer)
	}

	rb := make([]byte, 3)
	n, err := buff.Read(rb)
	if err != nil {
		t.Errorf("Got an error reading: %s", err)
	}
	if n != 3 {
		t.Errorf("Should have read 3 bytes, got %d", n)
	}
}
Ejemplo n.º 5
0
func newMessage(comm *Comm) *Message {
	r := new(Message)
	r.comm = comm
	r.Id = comm.nextSequenceId()
	r.SetSourceNode(r.comm.Cluster.MyNode)
	r.middleNodePresent = false
	r.Message = buffer.New()
	r.Wait = make(chan bool, 1)

	return r
}
Ejemplo n.º 6
0
func TestWriteOnce(t *testing.T) {
	buff := buffer.New()

	buff.WriteUint8(100)
	buff.Seek(0, 0)
	val, err := buff.ReadUint8()

	if val != 100 {
		t.Errorf("Read not equal 100: %d", val)
	}

	if err != nil {
		t.Errorf("Got an error: %s", err)
	}
}
Ejemplo n.º 7
0
func TestSpecific(t *testing.T) {
	buffer := buffer.New()

	buffer.WriteUint8(233)
	buffer.Seek(0, 0)
	val, err := buffer.ReadUint8()

	if err != nil {
		t.Errorf("Got an error reading: %s", err)
	}
	if val != 233 {
		t.Errorf("Should have read 233, but got %d", val)
	}

}