序
本文主要研究一下gost的ObjectPool
ObjectPool
gost/bytes/bytes_buffer_pool.go
// Pool is bytes.Buffer Pool
type ObjectPool struct {
New New
pool sync.Pool
}
func NewObjectPool(n New) *ObjectPool {
return &ObjectPool{New: n}
}
// take returns *bytes.Buffer from Pool
func (p *ObjectPool) Get() PoolObject {
v := p.pool.Get()
if v == nil {
return p.New()
}
return v.(PoolObject)
}
// give returns *byes.Buffer to Pool
func (p *ObjectPool) Put(o PoolObject) {
o.Reset()
p.pool.Put(o)
}
// Pool object
type PoolObject interface {
Reset()
}
type New func() PoolObject
ObjectPool定义了New及sync.Pool属性,它提供了Get、Put方法,同时还有NewObjectPool工程方法;New是一个func,返回PoolObject;PoolObject接口定义了Reset方法
defaultPool
gost/bytes/bytes_buffer_pool.go
var (
defaultPool *ObjectPool
)
func init() {
defaultPool = NewObjectPool(func() PoolObject {
return new(bytes.Buffer)
})
}
// GetBytesBuffer returns bytes.Buffer from pool
func GetBytesBuffer() *bytes.Buffer {
return defaultPool.Get().(*bytes.Buffer)
}
// PutIoBuffer returns IoBuffer to pool
func PutBytesBuffer(buf *bytes.Buffer) {
defaultPool.Put(buf)
}
defaultPool创建的ObjectPool,其Reset方法为new(bytes.Buffer),其GetBytesBuffer将defaultPool.Get()转换为
*bytes.Buffer
类型
实例
gost/bytes/bytes_buffer_pool_test.go
func TestBytesBufferPool(t *testing.T) {
buf := GetBytesBuffer()
bytes := []byte{0x00, 0x01, 0x02, 0x03, 0x04}
buf.Write(bytes)
if buf.Len() != len(bytes) {
t.Error("iobuffer len not match write bytes' size")
}
PutBytesBuffer(buf)
//buf2 := GetBytesBuffer()
// https://go-review.googlesource.com/c/go/+/162919/
// before go 1.13, sync.Pool just reserves some objs before every gc and will be cleanup by gc.
// after Go 1.13, maybe there are many reserved objs after gc.
//if buf != buf2 {
// t.Errorf("buf pointer %p != buf2 pointer %p", buf, buf2)
//}
}
这里展示用GetBytesBuffer获取buf,再通过PutBytesBuffer归还buf
小结
gost的ObjectPool定义了New及sync.Pool属性,它提供了Get、Put方法,同时还有NewObjectPool工程方法;New是一个func,返回PoolObject;PoolObject接口定义了Reset方法。
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