github.com/m3db/m3@v1.5.0/src/x/pool/bytes.go (about)

     1  // Copyright (c) 2016 Uber Technologies, Inc.
     2  //
     3  // Permission is hereby granted, free of charge, to any person obtaining a copy
     4  // of this software and associated documentation files (the "Software"), to deal
     5  // in the Software without restriction, including without limitation the rights
     6  // to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     7  // copies of the Software, and to permit persons to whom the Software is
     8  // furnished to do so, subject to the following conditions:
     9  //
    10  // The above copyright notice and this permission notice shall be included in
    11  // all copies or substantial portions of the Software.
    12  //
    13  // THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
    14  // IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
    15  // FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
    16  // AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
    17  // LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
    18  // OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
    19  // THE SOFTWARE.
    20  
    21  package pool
    22  
    23  type bytesPool struct {
    24  	pool BucketizedObjectPool
    25  }
    26  
    27  // NewBytesPool creates a new bytes pool
    28  func NewBytesPool(sizes []Bucket, opts ObjectPoolOptions) BytesPool {
    29  	return &bytesPool{pool: NewBucketizedObjectPool(sizes, opts)}
    30  }
    31  
    32  func (p *bytesPool) Init() {
    33  	p.pool.Init(func(capacity int) interface{} {
    34  		return make([]byte, 0, capacity)
    35  	})
    36  }
    37  
    38  func (p *bytesPool) Get(capacity int) []byte {
    39  	if capacity < 1 {
    40  		return nil
    41  	}
    42  
    43  	return p.pool.Get(capacity).([]byte)
    44  }
    45  
    46  func (p *bytesPool) Put(value []byte) {
    47  	value = value[:0]
    48  	p.pool.Put(value, cap(value))
    49  }
    50  
    51  // AppendByte appends a byte to a byte slice getting a new slice from the
    52  // BytesPool if the slice is at capacity
    53  func AppendByte(bytes []byte, b byte, pool BytesPool) []byte {
    54  	if len(bytes) == cap(bytes) {
    55  		newBytes := pool.Get(cap(bytes) * 2)
    56  		n := copy(newBytes[:len(bytes)], bytes)
    57  		pool.Put(bytes)
    58  		bytes = newBytes[:n]
    59  	}
    60  
    61  	return append(bytes, b)
    62  }