-
Notifications
You must be signed in to change notification settings - Fork 0
/
reader_cache.go
69 lines (60 loc) · 1.44 KB
/
reader_cache.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
56
57
58
59
60
61
62
63
64
65
66
67
68
69
// Copyright 2014 Google Inc. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
package ggit
import (
"bufio"
"compress/zlib"
"fmt"
"io"
"os"
)
type readCloserReset interface {
io.ReadCloser
Reset(io.Reader) error
}
// zlib.ReadCloserReset is a proposed addition to the go std library that might
// appear (in almost certainly a cleaner form) in go 1.4, but doesn't exist today.
// To build this code against 1.3 change this to an io.ReadCloser and change the
// zr.Reset(r) line to allocate a new zlib reader.
var zlibReaders = make(chan readCloserReset, 128)
func getZlibReader(r io.Reader) (io.ReadCloser, error) {
select {
case zr := <-zlibReaders:
err := zr.Reset(r)
return zr, err
default:
return zlib.NewReader(r)
}
}
func returnZlibReader(r io.ReadCloser) {
err := r.Close()
if err != nil {
fmt.Fprintf(os.Stderr, "error closing reader %v\n", err)
return
}
if rcr, ok := r.(readCloserReset); ok {
select {
case zlibReaders <- rcr:
default:
// adding to cache would block
}
}
}
var bufioReaders = make(chan *bufio.Reader, 128)
func getBufioReader(r io.Reader) *bufio.Reader {
select {
case br := <-bufioReaders:
br.Reset(r)
return br
default:
return bufio.NewReaderSize(r, 512)
}
}
func returnBufioReader(br *bufio.Reader) {
select {
case bufioReaders <- br:
default:
}
}