Write once read many object

worm.go

// Provides Write once read many (WORM) primitives
package worm

import (
	"sync"
)

// Object could be used to store interface{}
// Object is safe for concurrent usage
type Object struct {
	sync.RWMutex
	sealed bool
	v      interface{}
}

func NewWithValue(v interface{}) Object {
	return Object{
		sealed: true,
		v:      v,
	}
}

func (o Object) Set(v interface{}) {
	o.Lock()
	defer o.Unlock()

	if o.sealed {
		return
	}

	o.v = v
	o.sealed = true
}

func (o Object) Value() interface{} {
	o.RLock()
	v := o.v
	o.RUnlock()
	return v
}