C#的动态内存管理类

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#内存 #内存管理 #c#

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本文介绍了两个C#内存管理类：DynamicBufferManager用于管理动态缓存，支持数据的读写及清理操作；AsyncSendBufferManager针对异步发送场景，通过记录包偏移量和长度实现高效内存管理。

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前两天看到的一个c#的内存管理 DynamicBufferManager.cs

稍微阉割了一下

using System;

namespace IOCPLib.IOCP
{
    public class DynamicBufferManager
    {
        public byte[] Buffer { get; set; } //存放内存的数组
        public int DataCount { get; set; } //写入数据大小

        public DynamicBufferManager(int bufferSize)
        {
            DataCount = 0;
            Buffer = new byte[bufferSize];
        }

        public int GetDataCount() //获得当前写入的字节数
        {
            return DataCount;
        }

        public int GetReserveCount() //获得剩余的字节数
        {
            return Buffer.Length - DataCount;
        }

        public void Clear(int count) //清理指定大小的数据
        {
            if (count >= DataCount) //如果需要清理的数据大于现有数据大小，则全部清理
            {
                DataCount = 0;
            }
            else
            {
                for (int i = 0; i < DataCount - count; i++) //否则后面的数据往前移
                {
                    Buffer[i] = Buffer[count + i];
                }
                DataCount = DataCount - count;
            }
        }

        public void WriteBuffer(byte[] buffer, int offset, int count)
        {
            if (GetReserveCount() >= count) //缓冲区空间够，不需要申请
            {
                Array.Copy(buffer, offset, Buffer, DataCount, count);
                DataCount = DataCount + count;
            }
            else //缓冲区空间不够，需要申请更大的内存，并进行移位
            {
                int totalSize = Buffer.Length + count - GetReserveCount(); //总大小-空余大小
                byte[] tmpBuffer = new byte[totalSize];
                Array.Copy(Buffer, 0, tmpBuffer, 0, DataCount); //复制以前的数据
                Array.Copy(buffer, offset, tmpBuffer, DataCount, count); //复制新写入的数据
                DataCount = DataCount + count;
                Buffer = tmpBuffer; //替换
            }
        }

        public void WriteBuffer(byte[] buffer)
        {
            WriteBuffer(buffer, 0, buffer.Length);
        } 
    }
}

异步发送的内存管理类AsyncSendBufferManager.cs

using System;
using System.Collections.Generic;

namespace IOCPLib.IOCP
{
    struct SendBufferPacket  //记录每个包在内存中的offset和包长
    {
        public int Offset;
        public int Count;
    }

    //发送需要等待上一次回调才发下一次的响应，由于用于异步发送，可能同时多个数据写入内存
    public class AsyncSendBufferManager
    {
        private DynamicBufferManager m_dynamicBufferManager;
        public DynamicBufferManager DynamicBufferManager
        { get { return m_dynamicBufferManager; } }

        private List<SendBufferPacket> m_sendBufferList; //发送的数据包s
        private SendBufferPacket m_sendBufferPacket;

        public AsyncSendBufferManager(int bufferSize)
        {
            m_dynamicBufferManager = new DynamicBufferManager(bufferSize);
            m_sendBufferList = new List<SendBufferPacket>();
            m_sendBufferPacket.Offset = 0;
            m_sendBufferPacket.Count = 0;
        }

        public void StartPacket() //StartPacket 和 EndPacket 成对调用
        {
            m_sendBufferPacket.Offset = m_dynamicBufferManager.DataCount;
            m_sendBufferPacket.Count = 0;
        }

        public void EndPacket()
        {
            m_sendBufferPacket.Count = m_dynamicBufferManager.DataCount - m_sendBufferPacket.Offset;
            m_sendBufferList.Add(m_sendBufferPacket);
        }

        public bool GetFirstPacket(ref int offset, ref int count)
        {
            if (m_sendBufferList.Count <= 0)
                return false;
            offset = m_sendBufferList[0].Offset;
            count = m_sendBufferList[0].Count;
            return true;
        }

        public bool ClearFirstPacket()
        {
            if (m_sendBufferList.Count <= 0)
                return false;
            int count = m_sendBufferList[0].Count;
            m_dynamicBufferManager.Clear(count);
            m_sendBufferList.RemoveAt(0);
            return true;
        }

        public void ClearPacket()
        {
            m_sendBufferList.Clear();
            m_dynamicBufferManager.Clear(m_dynamicBufferManager.DataCount);
        }
    }
}

调用方法如下：

AsyncSendBufferManager asyncSendBufferManager = m_asyncUserToken.SendBuffer; //初始化 
asyncSendBufferManager.StartPacket();//StartPacket 和 EndPacket 成对
asyncSendBufferManager.DynamicBufferManager.WriteBuffer(head.GetBuffer(), 0, (int)head.Length);//head和body为两个数据写入一个buffer
asyncSendBufferManager.DynamicBufferManager.WriteBuffer(body.GetBuffer(), 0, (int)body.Length);
asyncSendBufferManager.EndPacket();

以上可用于异步socket收发的内存管理