I have a OpenGL , QT application in which i am sending remote commands from a client , Based on the incoming commands the application is rendering.
The process works fine but i am not very proficient with networking and would like to know how i can improve the concept of the sequencer for the incoming commands that i have built.
This is the Main function.
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
cont.SetName("RootItem");
TreeModel* model = new TreeModel("RootElement", &cont);
WavefrontRenderer w(model);
w.show(); // Show the QT GUI
glfwInit(); // Initialioze the GLFW
window = glfwCreateWindow(SCR_WIDTH , SCR_HEIGHT, "Renderer", nullptr, nullptr); // Create the render window
glfwMakeContextCurrent(window);
GLenum GlewInitResult;
glewExperimental = GL_TRUE;
GlewInitResult = glewInit();
boost::asio::io_service io_service;
server server1(io_service, 1980);
boost::thread t(boost::bind(&io_service::run, &io_service)); // Start The service in a new thread so that it does not block the GUI
while(!glfwWindowShouldClose(window))
{
// Process incoming commands
processCommands()
//Drawing Stuff here
Draw();
}
auto raii = makeCleaner( [&]() { io_service.stop(); }); // Stop the thread when the UI of QT closes
return a.exec();
}
I create a server on a new thread so that the GUI is not blocked.
Than in my rendering loop i first collect the incoming commands , process them and than render the scene.
To collect the commands from the server i have a global extern std::vector , whenever a new message comes to the server i pushback the string into this vector.
To process these commands before drawing i have a class named CommandInterface in which i run a loop based on vector.size() of the same extern std::vector.
The server when receiving commands from telnet is not able to to receive all the incoming commands.
Also i have a question when i am running the std::vector loop in Command interface and at that time server receives a message and adds it to the the same vector would that cause a crash ?
This is the code for the server.
#include <cstdlib>
#include <iostream>
#include <boost/bind.hpp>
#include <boost/asio.hpp>
#include <qdebug.h>
#include <global.h>
using boost::asio::ip::tcp;
class session
{
public:
session(boost::asio::io_service& io_service)
: socket_(io_service)
{
}
tcp::socket& socket()
{
return socket_;
}
void start()
{
boost::asio::streambuf buf;
boost::asio::read_until(socket_, buf, ";");
std::string data = boost::asio::buffer_cast<const char*>(buf.data());
incomingCommands.push_back(data); // Fill the the vector with incoming commands
}
private:
void handle_read(const boost::system::error_code& error,
size_t bytes_transferred)
{
if (!error)
{
boost::asio::async_write(socket_,
boost::asio::buffer("Wavefront_Hello", bytes_transferred),
boost::bind(&session::handle_write, this,
boost::asio::placeholders::error));
}
else
{
delete this;
}
}
void handle_write(const boost::system::error_code& error)
{
if (!error)
{
socket_.async_read_some(boost::asio::buffer(data_, max_length),
boost::bind(&session::handle_read, this,
boost::asio::placeholders::error,
boost::asio::placeholders::bytes_transferred));
}
else
{
delete this;
}
}
tcp::socket socket_;
enum { max_length = 2048 };
char data_[max_length];
};
class server
{
public:
server(boost::asio::io_service& io_service, short port)
: io_service_(io_service),
acceptor_(io_service, tcp::endpoint(tcp::v4(), port))
{
start_accept();
}
private:
void start_accept()
{
session* new_session = new session(io_service_);
acceptor_.async_accept(new_session->socket(),
boost::bind(&server::handle_accept, this, new_session,
boost::asio::placeholders::error));
}
void handle_accept(session* new_session,
const boost::system::error_code& error)
{
if (!error)
{
new_session->start();
}
else
{
delete new_session;
}
start_accept();
}
boost::asio::io_service& io_service_;
tcp::acceptor acceptor_;
};
