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mapstr_pointer.go
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/
mapstr_pointer.go
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package common
import (
"sync/atomic"
"unsafe"
)
// MapStrPointer stores a pointer to atomically get/set a MapStr object
// This should give faster access for use cases with lots of reads and a few
// changes.
// It's imortant to note that modifying the map is not thread safe, only fully
// replacing it.
type MapStrPointer struct {
p *unsafe.Pointer
}
// NewMapStrPointer initializes and returns a pointer to the given MapStr
func NewMapStrPointer(m MapStr) MapStrPointer {
pointer := unsafe.Pointer(&m)
return MapStrPointer{p: &pointer}
}
// Get returns the MapStr stored under this pointer
func (m MapStrPointer) Get() MapStr {
if m.p == nil {
return nil
}
return *(*MapStr)(atomic.LoadPointer(m.p))
}
// Set stores a pointer the given MapStr, replacing any previous one
func (m *MapStrPointer) Set(p MapStr) {
atomic.StorePointer(m.p, unsafe.Pointer(&p))
}