// Copyright 2021 storyicon@foxmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// 	http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package concurrent

import (
	"io"
	"sync"
)

// Buffer is goroutine safety buffer
type Buffer struct {
	writer io.Writer
	mutex  sync.Mutex
}

// Write implements the io.Writer
func (s *Buffer) Write(p []byte) (n int, err error) {
	s.mutex.Lock()
	defer s.mutex.Unlock()
	return s.writer.Write(p)
}

// NewBuffer is used to create a new buffer
func NewBuffer(writer io.Writer) io.Writer {
	return &Buffer{writer: writer}
}