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arena.go
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arena.go
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package logstorage
import (
"sync"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/bytesutil"
"github.com/VictoriaMetrics/VictoriaMetrics/lib/slicesutil"
)
func getArena() *arena {
v := arenaPool.Get()
if v == nil {
return &arena{}
}
return v.(*arena)
}
func putArena(a *arena) {
a.reset()
arenaPool.Put(a)
}
var arenaPool sync.Pool
type arena struct {
b []byte
}
func (a *arena) reset() {
a.b = a.b[:0]
}
func (a *arena) preallocate(n int) {
a.b = slicesutil.ExtendCapacity(a.b, n)
}
func (a *arena) sizeBytes() int {
return cap(a.b)
}
func (a *arena) copyBytes(b []byte) []byte {
if len(b) == 0 {
return b
}
ab := a.b
abLen := len(ab)
ab = append(ab, b...)
a.b = ab
return ab[abLen:]
}
func (a *arena) copyBytesToString(b []byte) string {
bCopy := a.copyBytes(b)
return bytesutil.ToUnsafeString(bCopy)
}
func (a *arena) copyString(s string) string {
b := bytesutil.ToUnsafeBytes(s)
return a.copyBytesToString(b)
}
func (a *arena) newBytes(size int) []byte {
if size <= 0 {
return nil
}
ab := a.b
abLen := len(ab)
ab = bytesutil.ResizeWithCopyMayOverallocate(ab, abLen+size)
result := ab[abLen:]
a.b = ab
return result
}