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65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
// Copyright 2026 Woodpecker Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package utils
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import (
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"sync"
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)
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// Protected provides thread-safe read and write access to a value of type T.
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type Protected[T any] interface {
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// Get returns the current value using a read lock, allowing multiple concurrent
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// readers. Safe to call from multiple goroutines simultaneously.
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Get() T
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// Set replaces the current value using an exclusive write lock.
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// Blocks until all ongoing reads/writes complete.
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Set(v T)
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// Update performs an atomic read-modify-write operation under a single exclusive
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// lock. The provided function receives the current value and returns the new value,
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// eliminating the race condition that would occur with a separate Get + Set.
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Update(fn func(T) T)
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}
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type protected[T any] struct {
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mu sync.RWMutex
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value T
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}
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// NewProtected creates and returns a new Protected wrapper initialized with the
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// given value. Use this as the constructor instead of creating a protected struct directly.
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func NewProtected[T any](initial T) Protected[T] {
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return &protected[T]{value: initial}
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}
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func (p *protected[T]) Get() T {
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p.mu.RLock()
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defer p.mu.RUnlock()
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return p.value
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}
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func (p *protected[T]) Set(v T) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.value = v
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}
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func (p *protected[T]) Update(fn func(T) T) {
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p.mu.Lock()
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defer p.mu.Unlock()
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p.value = fn(p.value)
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}
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