github.com/pawelgaczynski/gain@v0.4.0-alpha.0.20230821120126-41f1e60a18da/pkg/pool/sync/sync.go (about)

     1  // Copyright (c) 2023 Paweł Gaczyński
     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 sync
    16  
    17  import (
    18  	"sync"
    19  	"sync/atomic"
    20  )
    21  
    22  type Pool[T any] interface {
    23  	Get() T
    24  	Put(T)
    25  }
    26  
    27  type pool[T any] struct {
    28  	internalPool sync.Pool
    29  	count        int64
    30  }
    31  
    32  func getZero[T any]() T {
    33  	var result T
    34  
    35  	return result
    36  }
    37  
    38  func (p *pool[T]) Get() T {
    39  	val, ok := p.internalPool.Get().(T)
    40  	if !ok {
    41  		return getZero[T]()
    42  	}
    43  
    44  	atomic.AddInt64(&p.count, -1)
    45  
    46  	return val
    47  }
    48  
    49  func (p *pool[T]) Put(value T) {
    50  	p.internalPool.Put(value)
    51  	atomic.AddInt64(&p.count, 1)
    52  }
    53  
    54  func NewPool[T any]() Pool[T] {
    55  	return &pool[T]{
    56  		internalPool: sync.Pool{},
    57  	}
    58  }