You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
70 lines
1.8 KiB
70 lines
1.8 KiB
8 years ago
|
/*
|
||
|
|
* Minio Cloud Storage, (C) 2016 Minio, Inc.
|
||
|
|
*
|
||
|
|
* Licensed under the Apache License, Version 2.0 (the "License");
|
||
|
|
* you may not use this file except in compliance with the License.
|
||
|
|
* You may obtain a copy of the License at
|
||
|
|
*
|
||
|
|
* http://www.apache.org/licenses/LICENSE-2.0
|
||
|
|
*
|
||
|
|
* Unless required by applicable law or agreed to in writing, software
|
||
|
|
* distributed under the License is distributed on an "AS IS" BASIS,
|
||
|
|
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||
|
|
* See the License for the specific language governing permissions and
|
||
|
|
* limitations under the License.
|
||
|
|
*/
|
||
|
|
|
||
|
|
// Package bpool implements a fixed size pool of byte slices.
|
||
|
|
package bpool
|
||
|
|
|
||
|
|
import (
|
||
|
|
"errors"
|
||
|
|
"sync"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ErrBpoolNoFree - Normally this error should never be returned, this error
|
||
|
|
// indicates a bug in the package consumer.
|
||
|
|
var ErrBpoolNoFree = errors.New("no free byte slice in pool")
|
||
|
|
|
||
|
|
// BytePool - temporary pool of byte slices.
|
||
|
|
type BytePool struct {
|
||
|
|
buf [][]byte // array of byte slices
|
||
|
|
used []bool // indicates if a buf[i] is in use
|
||
|
|
size int64 // size of buf[i]
|
||
|
|
mu sync.Mutex
|
||
|
|
}
|
||
|
|
|
||
|
|
// Get - Returns an unused byte slice.
|
||
|
|
func (b *BytePool) Get() (buf []byte, err error) {
|
||
|
|
b.mu.Lock()
|
||
|
|
defer b.mu.Unlock()
|
||
|
|
for i := 0; i < len(b.used); i++ {
|
||
|
|
if !b.used[i] {
|
||
|
|
b.used[i] = true
|
||
|
|
if b.buf[i] == nil {
|
||
|
|
b.buf[i] = make([]byte, b.size)
|
||
|
|
}
|
||
|
|
return b.buf[i], nil
|
||
|
|
}
|
||
|
|
}
|
||
|
|
return nil, ErrBpoolNoFree
|
||
|
|
}
|
||
|
|
|
||
|
|
// Reset - Marks all slices as unused.
|
||
|
|
func (b *BytePool) Reset() {
|
||
|
|
b.mu.Lock()
|
||
|
|
defer b.mu.Unlock()
|
||
|
|
for i := 0; i < len(b.used); i++ {
|
||
|
|
b.used[i] = false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
// NewBytePool - Returns new pool.
|
||
|
|
// size - length of each slice.
|
||
|
|
// n - number of slices in the pool.
|
||
|
|
func NewBytePool(size int64, n int) *BytePool {
|
||
|
|
used := make([]bool, n)
|
||
|
|
buf := make([][]byte, n)
|
||
|
|
return &BytePool{buf, used, size, sync.Mutex{}}
|
||
|
|
}
|