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sizedbufferpool.go
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sizedbufferpool.go
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/*
*
* Copyright 2020 waterdrop authors.
*
* 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 xbuffer
import "bytes"
// SizedBufferPool sized buffer pool definition
type SizedBufferPool struct {
pool chan *bytes.Buffer
size int
alloc int
}
// SizedBufferPool creates a new BufferPool bounded to the given size.
// size defines the number of buffers to be retained in the pool and alloc sets
// the initial capacity of new buffers to minimize calls to make().
//
// The value of alloc should seek to provide a buffer that is representative of
// most data written to the the buffer (i.e. 95th percentile) without being
// overly large (which will increase static memory consumption).
func NewSizedBufferPool(size int, alloc int) (bp *SizedBufferPool) {
return &SizedBufferPool{
size: size,
pool: make(chan *bytes.Buffer, size),
alloc: alloc,
}
}
// Get gets a Buffer from the SizedBufferPool, or creates a new one if none are
// available in the pool. Buffers have a pre-allocated capacity.
func (bp *SizedBufferPool) Get() (b *bytes.Buffer) {
select {
case b = <-bp.pool:
// reuse existing buffer
default:
// create new buffer
b = bytes.NewBuffer(make([]byte, 0, bp.alloc))
}
return
}
// Put returns the given Buffer to the SizedBufferPool.
func (bp *SizedBufferPool) Put(b *bytes.Buffer) {
if b.Cap() > bp.alloc {
if len(bp.pool) < bp.size {
b = bytes.NewBuffer(make([]byte, 0, bp.alloc))
} else {
return
}
} else {
b.Reset()
}
select {
case bp.pool <- b:
default: // Discard the buffer if the pool is full.
}
}