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我有实现 Poco SocketReactor 的代码,如 Echo 示例中所述。

class TSPConnectionHandler
{
    public:
        TSPConnectionHandler(const StreamSocket& socket, SocketReactor& reactor) :      _socket(socket),
                                                                                    _reactor(reactor)
        {
            _reactor.addEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, ReadableNotification>(*this, &TSPConnectionHandler::onSocketReadable));
            _reactor.addEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, WritableNotification>(*this, &TSPConnectionHandler::onSocketWritable));
            _reactor.addEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, ShutdownNotification>(*this, &TSPConnectionHandler::onSocketShutdown));
            _reactor.addEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, ErrorNotification>(*this, &TSPConnectionHandler::onSocketError));
            _reactor.addEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, TimeoutNotification>(*this, &TSPConnectionHandler::onSocketTimeout));
        }
        virtual ~TSPConnectionHandler()
        {
            _reactor.removeEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, ReadableNotification>(*this, &TSPConnectionHandler::onSocketReadable));
            _reactor.removeEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, WritableNotification>(*this, &TSPConnectionHandler::onSocketWritable));
            _reactor.removeEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, ShutdownNotification>(*this, &TSPConnectionHandler::onSocketShutdown));
            _reactor.removeEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, ErrorNotification>(*this, &TSPConnectionHandler::onSocketError));
            _reactor.removeEventHandler(_socket, Poco::NObserver<TSPConnectionHandler, TimeoutNotification>(*this, &TSPConnectionHandler::onSocketTimeout));
        }

    void onSocketReadable(const Poco::AutoPtr<ReadableNotification>& pNf)
    {
        cout << "READable   !!" << endl;
      try
      {
        vector<char> m_buffer;
        m_buffer.resize(1024, '\0');
        LONG32 m_buflen = _socket.receiveBytes(&m_buffer[0], 1024);
        if (m_buflen == 0)
        {
          cout << "Connection reset by peer normally" << endl;
          delete this;
        }
        _socket.sendBytes(&m_buffer[0], m_buflen);
      }
      catch(Poco::Net::NetException& e)
      {
          cout << "socket read exception: " << e.displayText() << endl;
          delete this;
      }
    }
    void onSocketWritable(const Poco::AutoPtr<WritableNotification>& pNf)
    {
        cout << "WRITEable   !!" << endl;
    }
    void onSocketShutdown(const Poco::AutoPtr<ShutdownNotification>& pNf)
    {
        cout << "SHUTDOWN!!!!!!!!!!!!" << endl;
        delete(this);
    }
    void onSocketError(const Poco::AutoPtr<ErrorNotification>& pNf)
    {
        cout << "Error!!" << endl;
    }
    void onSocketTimeout(const Poco::AutoPtr<TimeoutNotification>& pNf)
    {
        cout << "Timeout!!" << endl;
    }

    private:
        StreamSocket _socket;
        SocketReactor& _reactor;
};

它使用以下代码在程序的其他地方正常启动:

Poco::Net::ServerSocket tcpsock("9495");
Poco::Net::SocketReactor reactor;
Poco::Net::SocketAcceptor<TSPConnectionHandler> acceptor(tcpsock, reactor);
Poco::Thread thread;
thread.start(reactor);

waitForTerminationRequest();

reactor.stop();
thread.join();
return Application::EXIT_OK;

我也有python客户端来测试它:

import socket

client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
client_socket.connect(('localhost', 9495))
data = raw_input ( "Something:" )
client_socket.send(data)
data = client_socket.recv(1024)
print "RECIEVED:" , data
client_socket.close()

我得到了我不明白如何解决的问题列表:

  • python字符串“client_socket.connect(('localhost', 9495))”完成后,服务器开始发送垃圾邮件“onSocketWritable”,如何阻止它?我知道如果套接字变得可写,我必须得到通知,但是为什么它会在套接字的整个生命周期中继续这样做呢?如果那是正常情况,Wri​​tableNotification 是为了什么而设计的?
  • 如果我在调试模式下启动 python 并在“client_socket.close()”之前关闭它,服务器会得到异常并将被删除抛出“socket read exception:”。但不会发送errornotification 和shutdownnotification。为什么?反正我从来没见过他们派人。
  • 如果我让“client_socket.close()”完成,在服务器端我将收到 ReadableNotification 并将抛出“正常由对等方重置连接”。但仍然不会有 ShutdownNotification。为什么?
4

1 回答 1

2
  1. 一旦您连接到服务器,就会实例化一个套接字,如果您注册了一个可写通知,您将收到有关此状态的通知。这意味着仅当您必须发送数据时才添加此事件处理程序。套接字将发送数据,完成后,再次调用此处理程序(异步套接字...)。如果您不必为此事件发送更多块的调用 removeEventHandler。

  2. 套接字反应器使用选择命令 (Socket::select(reading, writable, except, _timeout)) 的名称 errornotification 有点误导(会得到一些错误情况但也会得到越界数据)。如果套接字正常关闭,将在没有可用字符的情况下调用 onReadable,否则将抛出 Poco::Net::ConnectionResetException。

  3. 当 SocketReactor 停止时发送 ShutdownNotification。

你应该看看 SocketRactor.cpp 然后一切都清楚多了。

于 2014-04-10T21:52:06.707 回答