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bytes_pool.go
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bytes_pool.go
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package strutil
// ByteChanPool struct
//
// Usage:
// bp := strutil.NewByteChanPool(500, 1024, 1024)
// buf:=bp.Get()
// defer bp.Put(buf)
// // use buf do something ...
//
// refer https://www.flysnow.org/2020/08/21/golang-chan-byte-pool.html
// from https://github.com/minio/minio/blob/master/internal/bpool/bpool.go
type ByteChanPool struct {
c chan []byte
w int
wcap int
}
// NewByteChanPool instance
func NewByteChanPool(maxSize int, width int, capWidth int) *ByteChanPool {
return &ByteChanPool{
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 *ByteChanPool) 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 *ByteChanPool) 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 *ByteChanPool) Width() (n int) {
return bp.w
}
// WidthCap returns the cap width of the byte arrays in this pool.
func (bp *ByteChanPool) WidthCap() (n int) {
return bp.wcap
}