mirror of
https://github.com/nabbar/golib.git
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a5845082c9
- new package to simplify usage of atomic.Value & sync map by using generic struct/interface with cast - add generic function to cast model
103 lines
2.4 KiB
Go
103 lines
2.4 KiB
Go
/*
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* MIT License
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*
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* Copyright (c) 2024 Nicolas JUHEL
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*
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*
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*/
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package atomic
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import (
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"sync/atomic"
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)
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type val[T any] struct {
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av *atomic.Value // atomic value of T
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dl *atomic.Value // default value for load
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ds *atomic.Value // default value for store
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}
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func (o *val[T]) SetDefaultLoad(def T) {
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o.dl.Store(newDefault[T](def))
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}
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func (o *val[T]) SetDefaultStore(def T) {
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o.ds.Store(newDefault[T](def))
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}
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func (o *val[T]) getDefault(i any) T {
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if v, k := Cast[defaultValue[T]](i); !k {
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var tmp T
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return tmp
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} else {
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return v.GetDefault()
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}
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}
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func (o *val[T]) getDefaultLoad() T {
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return o.getDefault(o.dl.Load())
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}
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func (o *val[T]) getDefaultStore() T {
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return o.getDefault(o.ds.Load())
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}
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func (o *val[T]) Load() (val T) {
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if v, k := Cast[T](o.av.Load()); !k {
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return o.getDefaultLoad()
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} else {
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return v
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}
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}
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func (o *val[T]) Store(val T) {
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if IsEmpty[T](val) {
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o.av.Store(o.getDefaultStore())
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} else {
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o.av.Store(val)
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}
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}
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func (o *val[T]) Swap(new T) (old T) {
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if IsEmpty[T](new) {
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new = o.getDefaultStore()
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}
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if v, k := Cast[T](o.av.Swap(new)); !k {
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return o.getDefaultLoad()
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} else {
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return v
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}
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}
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func (o *val[T]) CompareAndSwap(old, new T) (swapped bool) {
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if IsEmpty[T](old) {
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old = o.getDefaultStore()
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}
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if IsEmpty[T](new) {
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new = o.getDefaultStore()
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}
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return o.av.CompareAndSwap(old, new)
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}
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