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