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
}
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()
}
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)
}
}
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)
}
}
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
}
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)
}
}
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)
}
}
