github.com/livekit/protocol@v1.39.3/utils/configutil/atomic.go (about)

     1  // Copyright 2024 LiveKit, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package configutil
    16  
    17  import (
    18  	"time"
    19  
    20  	"go.uber.org/atomic"
    21  )
    22  
    23  type ConfigObserver[T any] interface {
    24  	Observe(cb func(*T)) func()
    25  	Load() *T
    26  }
    27  
    28  func NewAtomicBool[C any](config ConfigObserver[C], accessor func(*C) bool) *atomic.Bool {
    29  	return newAtomic(atomic.NewBool, config, accessor)
    30  }
    31  
    32  func NewAtomicDuration[C any](config ConfigObserver[C], accessor func(*C) time.Duration) *atomic.Duration {
    33  	return newAtomic(atomic.NewDuration, config, accessor)
    34  }
    35  
    36  func NewAtomicFloat32[C any](config ConfigObserver[C], accessor func(*C) float32) *atomic.Float32 {
    37  	return newAtomic(atomic.NewFloat32, config, accessor)
    38  }
    39  
    40  func NewAtomicFloat64[C any](config ConfigObserver[C], accessor func(*C) float64) *atomic.Float64 {
    41  	return newAtomic(atomic.NewFloat64, config, accessor)
    42  }
    43  
    44  func NewAtomicInt32[C any](config ConfigObserver[C], accessor func(*C) int32) *atomic.Int32 {
    45  	return newAtomic(atomic.NewInt32, config, accessor)
    46  }
    47  
    48  func NewAtomicInt64[C any](config ConfigObserver[C], accessor func(*C) int64) *atomic.Int64 {
    49  	return newAtomic(atomic.NewInt64, config, accessor)
    50  }
    51  
    52  func NewAtomicString[C any](config ConfigObserver[C], accessor func(*C) string) *atomic.String {
    53  	return newAtomic(atomic.NewString, config, accessor)
    54  }
    55  
    56  func NewAtomicTime[C any](config ConfigObserver[C], accessor func(*C) time.Time) *atomic.Time {
    57  	return newAtomic(atomic.NewTime, config, accessor)
    58  }
    59  
    60  func NewAtomicUint32[C any](config ConfigObserver[C], accessor func(*C) uint32) *atomic.Uint32 {
    61  	return newAtomic(atomic.NewUint32, config, accessor)
    62  }
    63  
    64  func NewAtomicUint64[C any](config ConfigObserver[C], accessor func(*C) uint64) *atomic.Uint64 {
    65  	return newAtomic(atomic.NewUint64, config, accessor)
    66  }
    67  
    68  func NewAtomicPointer[T, C any](config ConfigObserver[C], accessor func(*C) *T) *atomic.Pointer[T] {
    69  	return newAtomic(atomic.NewPointer[T], config, accessor)
    70  }
    71  
    72  type AtomicValue[T any] struct {
    73  	v atomic.Value
    74  }
    75  
    76  func newAtomicValue[T any](_ T) *AtomicValue[T] {
    77  	return &AtomicValue[T]{}
    78  }
    79  
    80  func (a *AtomicValue[T]) Store(v T) {
    81  	a.v.Store(v)
    82  }
    83  
    84  func (a *AtomicValue[T]) Load() T {
    85  	return a.v.Load().(T)
    86  }
    87  
    88  func NewAtomicValue[T, C any](config ConfigObserver[C], accessor func(*C) T) *AtomicValue[T] {
    89  	return newAtomic(newAtomicValue[T], config, accessor)
    90  }
    91  
    92  func newAtomic[T, C any, A interface{ Store(T) }](ctor func(T) A, config ConfigObserver[C], accessor func(*C) T) A {
    93  	var zero T
    94  	v := ctor(zero)
    95  	config.Observe(func(cc *C) { v.Store(accessor(cc)) })
    96  	v.Store(accessor(config.Load()))
    97  	return v
    98  }