muduo Tcpconnection类

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本文详细解析了muduo库中TcpConnection类的构造过程及核心函数handleRead与handleWrite的工作原理。TcpConnection负责封装一次TCP连接，在构造函数中为对应的socket设置事件处理函数，并初始化相关成员变量。handleRead函数将读取的数据存入缓冲区并调用回调函数处理数据；handleWrite函数则从输出缓冲区读取数据并发送。

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muduo Tcpconnection 封装一次连接

在构造时候为所对应的socked 设置事件处理函数

TcpConnection::TcpConnection(EventLoop* loop,
const string& nameArg,
int sockfd,
const InetAddress& localAddr,
const InetAddress& peerAddr)
: loop_(CHECK_NOTNULL(loop)),
name_(nameArg),
state_(kConnecting),
socket_(new Socket(sockfd)),
channel_(new Channel(loop, sockfd)),
localAddr_(localAddr),
peerAddr_(peerAddr),
highWaterMark_(64*1024*1024)
{
channel_->setReadCallback(
boost::bind(&TcpConnection::handleRead, this, _1));
channel_->setWriteCallback(
boost::bind(&TcpConnection::handleWrite, this));
channel_->setCloseCallback(
boost::bind(&TcpConnection::handleClose, this));
channel_->setErrorCallback(
boost::bind(&TcpConnection::handleError, this));
LOG_DEBUG << "TcpConnection::ctor[" << name_ << "] at " << this
<< " fd=" << sockfd;
socket_->setKeepAlive(true);
}

分析下对应的handRead 和handWrite函数

handRead函数读出的数据放入缓冲区 inputBuffer,调用messageCallback 处理数据

void TcpConnection::handleRead(Timestamp receiveTime)
{
loop_->assertInLoopThread();
int savedErrno = 0;
ssize_t n = inputBuffer_.readFd(channel_->fd(), &savedErrno); // 读出的数据放到buffer
if (n > 0)
{
messageCallback_(shared_from_this(), &inputBuffer_, receiveTime);
}
else if (n == 0)
{
handleClose();
}
else
{
errno = savedErrno;
LOG_SYSERR << "TcpConnection::handleRead";
handleError();
}
}

//从outputBufer 缓冲区读出数据，发送出去
void TcpConnection::handleWrite()
{
loop_->assertInLoopThread();
if (channel_->isWriting())
{
ssize_t n = sockets::write(channel_->fd(),
outputBuffer_.peek(),
outputBuffer_.readableBytes());
if (n > 0)
{
outputBuffer_.retrieve(n);
if (outputBuffer_.readableBytes() == 0)
{
channel_->disableWriting();
if (writeCompleteCallback_)
{
loop_->queueInLoop(boost::bind(writeCompleteCallback_, shared_from_this()));
}
if (state_ == kDisconnecting)
{
shutdownInLoop();
}
}
}