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buffer_pool.go
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buffer_pool.go
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// Copyright 2013-2019 Aerospike, 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 types
import "sync"
// BufferPool implements a specialized buffer pool.
// Pool size will be limited, and each buffer size will be
// constrained to the init and max buffer sizes.
type BufferPool struct {
pool [][]byte
poolSize int
pos int64
maxBufSize int
initBufSize int
mutex sync.Mutex
}
// NewBufferPool creates a new buffer pool.
// New buffers will be created with size and capacity of initBufferSize.
// If cap(buffer) is larger than maxBufferSize when it is put back in the buffer,
// it will be thrown away. This will prevent unwanted memory bloat and
// set a deterministic maximum-size for the pool which will not be exceeded.
func NewBufferPool(poolSize, initBufferSize, maxBufferSize int) *BufferPool {
return &BufferPool{
pool: make([][]byte, poolSize),
pos: -1,
poolSize: poolSize,
maxBufSize: maxBufferSize,
initBufSize: initBufferSize,
}
}
// Get returns a buffer from the pool. If pool is empty, a new buffer of
// size initBufSize will be created and returned.
func (bp *BufferPool) Get() (res []byte) {
bp.mutex.Lock()
if bp.pos >= 0 {
res = bp.pool[bp.pos]
bp.pos--
} else {
res = make([]byte, bp.initBufSize, bp.initBufSize)
}
bp.mutex.Unlock()
return res
}
// Put will put the buffer back in the pool, unless cap(buf) is bigger than
// initBufSize, in which case it will be thrown away
func (bp *BufferPool) Put(buf []byte) {
if len(buf) <= bp.maxBufSize {
bp.mutex.Lock()
if bp.pos < int64(bp.poolSize-1) {
bp.pos++
bp.pool[bp.pos] = buf
}
bp.mutex.Unlock()
}
}