| 1 | package syncutil |
| 2 | |
| 3 | import "sync" |
| 4 | |
| 5 | type LockedImmutable[T any] struct { |
| 6 | mu sync.RWMutex |
| 7 | value T |
| 8 | } |
| 9 | |
| 10 | func NewLockedImmutable[T any](value T) *LockedImmutable[T] { |
| 11 | return &LockedImmutable[T]{value: value} |
| 12 | } |
| 13 | |
| 14 | func (l *LockedImmutable[T]) Do(f func(value T) T) { |
| 15 | l.mu.Lock() |
| 16 | defer l.mu.Unlock() |
| 17 | l.value = f(l.value) |
| 18 | } |
| 19 | |
| 20 | func (l *LockedImmutable[T]) Set(value T) { |
| 21 | l.mu.Lock() |
| 22 | defer l.mu.Unlock() |
| 23 | l.value = value |
| 24 | } |
| 25 | |
| 26 | func (l *LockedImmutable[T]) Get() T { |
| 27 | l.mu.RLock() |
| 28 | defer l.mu.RUnlock() |
| 29 | return l.value |
| 30 | } |
| 31 | |
| 32 | func (l *LockedImmutable[T]) Apply(f func(value T)) { |
| 33 | l.mu.RLock() |
| 34 | defer l.mu.RUnlock() |
| 35 | f(l.value) |
| 36 | } |
| 37 | |
| 38 | func ApplyWithResult[T any, V any](l *LockedImmutable[T], f func(value T) V) V { |
| 39 | l.mu.RLock() |
| 40 | defer l.mu.RUnlock() |
| 41 | return f(l.value) |
| 42 | } |
| 43 | |