84 lines
1.8 KiB
Go
84 lines
1.8 KiB
Go
package mempool
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import (
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"bytes"
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"sync"
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)
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var bufPool = NewBuffer(0)
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// GetBuffer 从默认缓冲池中获取一个缓冲区
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// GetBuffer takes a Buffer from the default buffer pool
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func GetBuffer() *bytes.Buffer { return bufPool.Get() }
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// PutBuffer 将 Buffer 返回到默认缓冲池
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// PutBuffer returns Buffer to the default buffer pool
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func PutBuffer(x *bytes.Buffer) { bufPool.Put(x) }
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// BufferPool 缓冲池接口
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type BufferPool interface {
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Get() *bytes.Buffer
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Put(x *bytes.Buffer)
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}
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// NewBuffer returns a buffer pool. The max specify the max capacity of the Buffer the pool will
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// return. If the Buffer becoomes large than max, it will no longer be returned to the pool. If
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// max <= 0, no limit will be enforced.
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func NewBuffer(max int) BufferPool {
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if max > 0 {
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return newBufferWithCap(max)
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}
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return newBuffer()
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}
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// Buffer is a Buffer pool.
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type Buffer struct {
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pool *sync.Pool
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}
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func newBuffer() *Buffer {
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return &Buffer{
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pool: &sync.Pool{
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New: func() any { return new(bytes.Buffer) },
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},
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}
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}
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// Get a Buffer from the pool.
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func (b *Buffer) Get() *bytes.Buffer {
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return b.pool.Get().(*bytes.Buffer)
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}
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// Put the Buffer back into pool. It resets the Buffer for reuse.
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func (b *Buffer) Put(x *bytes.Buffer) {
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x.Reset()
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b.pool.Put(x)
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}
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// BufferWithCap is a Buffer pool that
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type BufferWithCap struct {
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bp *Buffer
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max int
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}
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func newBufferWithCap(max int) *BufferWithCap {
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return &BufferWithCap{
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bp: newBuffer(),
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max: max,
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}
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}
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// Get a Buffer from the pool.
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func (b *BufferWithCap) Get() *bytes.Buffer {
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return b.bp.Get()
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}
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// Put the Buffer back into the pool if the capacity doesn't exceed the limit. It resets the Buffer
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// for reuse.
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func (b *BufferWithCap) Put(x *bytes.Buffer) {
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if x.Cap() > b.max {
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return
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}
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b.bp.Put(x)
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}
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