bytebufferpool

package module
Version: v1.0.0 Latest Latest
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Published: Aug 17, 2016 License: MIT Imports: 4 Imported by: 415

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bytebufferpool

An implementation of a pool of byte buffers with anti-memory-waste protection.

The pool may waste limited amount of memory due to fragmentation. This amount equals to the maximum total size of the byte buffers in concurrent use.

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Currently bytebufferpool is fastest and most effective buffer pool written in Go.

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Documentation

Overview

Package bytebufferpool implements a pool of byte buffers with anti-fragmentation protection.

The pool may waste limited amount of memory due to fragmentation. This amount equals to the maximum total size of the byte buffers in concurrent use.

Index

Examples

Constants

This section is empty.

Variables

This section is empty.

Functions

func Put

func Put(b *ByteBuffer)

Put returns byte buffer to the pool.

ByteBuffer.B mustn't be touched after returning it to the pool. Otherwise data races will occur.

Types

type ByteBuffer

type ByteBuffer struct {

	// B is a byte buffer to use in append-like workloads.
	// See example code for details.
	B []byte
}

ByteBuffer provides byte buffer, which can be used for minimizing memory allocations.

ByteBuffer may be used with functions appending data to the given []byte slice. See example code for details.

Use Get for obtaining an empty byte buffer.

Example
package main

import (
	"fmt"

	"github.com/valyala/bytebufferpool"
)

func main() {
	bb := bytebufferpool.Get()

	bb.WriteString("first line\n")
	bb.Write([]byte("second line\n"))
	bb.B = append(bb.B, "third line\n"...)

	fmt.Printf("bytebuffer contents=%q", bb.B)

	// It is safe to release byte buffer now, since it is
	// no longer used.
	bytebufferpool.Put(bb)
}
Output:

func Get

func Get() *ByteBuffer

Get returns an empty byte buffer from the pool.

Got byte buffer may be returned to the pool via Put call. This reduces the number of memory allocations required for byte buffer management.

func (*ByteBuffer) Bytes

func (b *ByteBuffer) Bytes() []byte

Bytes returns b.B, i.e. all the bytes accumulated in the buffer.

The purpose of this function is bytes.Buffer compatibility.

func (*ByteBuffer) Len

func (b *ByteBuffer) Len() int

Len returns the size of the byte buffer.

func (*ByteBuffer) ReadFrom

func (b *ByteBuffer) ReadFrom(r io.Reader) (int64, error)

ReadFrom implements io.ReaderFrom.

The function appends all the data read from r to b.

func (*ByteBuffer) Reset

func (b *ByteBuffer) Reset()

Reset makes ByteBuffer.B empty.

func (*ByteBuffer) Set

func (b *ByteBuffer) Set(p []byte)

Set sets ByteBuffer.B to p.

func (*ByteBuffer) SetString

func (b *ByteBuffer) SetString(s string)

SetString sets ByteBuffer.B to s.

func (*ByteBuffer) String

func (b *ByteBuffer) String() string

String returns string representation of ByteBuffer.B.

func (*ByteBuffer) Write

func (b *ByteBuffer) Write(p []byte) (int, error)

Write implements io.Writer - it appends p to ByteBuffer.B

func (*ByteBuffer) WriteByte

func (b *ByteBuffer) WriteByte(c byte) error

WriteByte appends the byte c to the buffer.

The purpose of this function is bytes.Buffer compatibility.

The function always returns nil.

func (*ByteBuffer) WriteString

func (b *ByteBuffer) WriteString(s string) (int, error)

WriteString appends s to ByteBuffer.B.

func (*ByteBuffer) WriteTo

func (b *ByteBuffer) WriteTo(w io.Writer) (int64, error)

WriteTo implements io.WriterTo.

type Pool

type Pool struct {
	// contains filtered or unexported fields
}

Pool represents byte buffer pool.

Distinct pools may be used for distinct types of byte buffers. Properly determined byte buffer types with their own pools may help reducing memory waste.

func (*Pool) Get

func (p *Pool) Get() *ByteBuffer

Get returns new byte buffer with zero length.

The byte buffer may be returned to the pool via Put after the use in order to minimize GC overhead.

func (*Pool) Put

func (p *Pool) Put(b *ByteBuffer)

Put releases byte buffer obtained via Get to the pool.

The buffer mustn't be accessed after returning to the pool.

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