/
wal_writer.go
55 lines (48 loc) · 1.14 KB
/
wal_writer.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
package wal
import (
"bufio"
"os"
)
// WriterWrapper wrap the write file.
// it contains the actual file handle and memory bufio
type WriterWrapper struct {
file *os.File
writer *bufio.Writer
}
// NewWriterWrapper creates a new buffer writer to write data to file.
func NewWriterWrapper(file *os.File, bufferLimitSize int) *WriterWrapper {
bufWriter := bufio.NewWriterSize(file, bufferLimitSize)
w := &WriterWrapper{
file: file,
writer: bufWriter,
}
return w
}
// Write tries to record data to memory bufio.
func (w *WriterWrapper) Write(p []byte) (n int, err error) {
return w.writer.Write(p)
}
// Flush tries to flush the data from memory bufio to actual file.
func (w *WriterWrapper) Flush() (err error) {
err = w.writer.Flush()
if err != nil {
return err
}
return w.file.Sync()
}
// Close tries to actual file handle.
func (w *WriterWrapper) Close() (err error) {
return w.file.Close()
}
// FlushAndClose successive invoke function Flush and Close
func (w *WriterWrapper) FlushAndClose() (err error) {
err = w.writer.Flush()
if err != nil {
return err
}
err = w.file.Sync()
if err != nil {
return err
}
return w.Close()
}