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pool.go
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pool.go
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// Copyright (c) 2023 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
package pool
import (
"sync"
)
// A Constructor is a function that creates a T when a [Pool] is empty.
type Constructor[T any] func() T
// A Pool is a generic wrapper around [sync.Pool] to provide strongly-typed
// object pooling.
type Pool[T any] struct {
pool sync.Pool
ctor Constructor[T]
}
// New returns a new [Pool] for T, and will use ctor to construct new Ts when
// the pool is empty.
func New[T any](ctor Constructor[T]) *Pool[T] {
return &Pool[T]{
pool: sync.Pool{
New: func() any {
return ctor()
},
},
ctor: ctor,
}
}
// Get gets a new T from the pool, or creates a new one if the pool is empty.
func (p *Pool[T]) Get() T {
if x, ok := p.pool.Get().(T); ok {
return x
}
// n.b. This branch is effectively unreachable.
return p.ctor()
}
// Put puts x into the pool.
func (p *Pool[T]) Put(x T) {
p.pool.Put(x)
}