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77 lines (68 loc) · 2.04 KB
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// Original work https://github.com/oxtoacart/bpool borrowed
// only bpool.go licensed under Apache 2.0.
// This file modifies original bpool.go to add one more option
// to provide []byte capacity for better GC management.
/*
* Minio Cloud Storage (C) 2018 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
// BytePoolCap implements a leaky pool of []byte in the form of a bounded channel.
type BytePoolCap struct {
c chan []byte
w int
wcap int
}
// NewBytePoolCap creates a new BytePool bounded to the given maxSize, with new
// byte arrays sized based on width.
func NewBytePoolCap(maxSize int, width int, capwidth int) (bp *BytePoolCap) {
return &BytePoolCap{
c: make(chan []byte, maxSize),
w: width,
wcap: capwidth,
}
}
// Get gets a []byte from the BytePool, or creates a new one if none are
// available in the pool.
func (bp *BytePoolCap) Get() (b []byte) {
select {
case b = <-bp.c:
// reuse existing buffer
default:
// create new buffer
if bp.wcap > 0 {
b = make([]byte, bp.w, bp.wcap)
} else {
b = make([]byte, bp.w)
}
}
return
}
// Put returns the given Buffer to the BytePool.
func (bp *BytePoolCap) Put(b []byte) {
select {
case bp.c <- b:
// buffer went back into pool
default:
// buffer didn't go back into pool, just discard
}
}
// Width returns the width of the byte arrays in this pool.
func (bp *BytePoolCap) Width() (n int) {
return bp.w
}
// WidthCap returns the cap width of the byte arrays in this pool.
func (bp *BytePoolCap) WidthCap() (n int) {
return bp.wcap
}