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Asynchronous processing in C ++

A server that will work forever and processes requests needs the asynchronous part of the code, which will execute some database queries and only update if there are any new changes. The server must start forever, and this function must execute asynchronously again and again to execute the db function, so the server will not interfere with the update once every "x" minutes.

What is the best way to handle this asynchronously in C ++? How can I configure this function myself to run on daemons so that it does not block the server at all?

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3 answers

Boost ASIO

, , - . boost:: asio:: io_service .

  • boost::asio::ip::tcp::acceptor .
  • A boost::asio::deadline_time .

, , :

#include <iostream>
#include <boost/asio.hpp>
#include <boost/bind.hpp>
#include <boost/shared_ptr.hpp>
#include <string>

class DatabaseUpdateChecker{
    public:
    DatabaseUpdateChecker(boost::asio::io_service& io, const int& sleepTimeSeconds)
    :timer_(io,boost::posix_time::seconds(sleepTimeSeconds)),sleepSeconds_(sleepTimeSeconds){
        this->timer_.async_wait(boost::bind(&DatabaseUpdateChecker::doDBUpdateCheck,this,boost::asio::placeholders::error));
    };

    protected:
    void doDBUpdateCheck(const boost::system::error_code& error){
        if(!error){
            std::cout << " Checking Database for updates" << std::endl;
            //Reschdule ourself
            this->timer_.expires_at(timer_.expires_at() + boost::posix_time::seconds(this->sleepSeconds_));
            this->timer_.async_wait(boost::bind(&DatabaseUpdateChecker::doDBUpdateCheck,this,boost::asio::placeholders::error));
        }
    };
    private:
    boost::asio::deadline_timer timer_;
    int sleepSeconds_;  
};

typedef boost::shared_ptr<boost::asio::ip::tcp::socket> TcpSocketPtr;

class NetworkRequest{
    public: 
    NetworkRequest(boost::asio::io_service& io, const int& port)
    :acceptor_(io,boost::asio::ip::tcp::endpoint(boost::asio::ip::tcp::v4(),port)){
        this->start_accept();   
    };  
    protected:
    void start_accept(){
        TcpSocketPtr socketPtr(new boost::asio::ip::tcp::socket(acceptor_.get_io_service()));
        std::cout << "About to accept new connection" << std::endl;
        acceptor_.async_accept(*socketPtr,boost::bind(&NetworkRequest::handle_accept,this,socketPtr,boost::asio::placeholders::error));
    };  
    void handle_accept(TcpSocketPtr socketPtr,const boost::system::error_code& error){
        std::cout << "Accepted new network connection" << std::endl;
        if(!error){
            std::string response("This is a response\n");
            boost::asio::async_write(*socketPtr,boost::asio::buffer(response),
                boost::bind(&NetworkRequest::handle_write,this,boost::asio::placeholders::error,boost::asio::placeholders::bytes_transferred));
        }
        //Start listeing for a new connection
        this->start_accept();
    }   
    void handle_write(const boost::system::error_code& error,size_t size){
        if(!error){
            std::cout << "Wrote out " << size << " bytes to the network connection" << std::endl;
        }

    }   
    private:
    boost::asio::ip::tcp::acceptor acceptor_;
};

int main(int argc, char *argv[]) {
    static const int DB_TIMER_SECONDS=5;
    static const int LISTENING_TCP_PORT=4444;

    std::cout << "About to start" << std::endl;
    boost::asio::io_service io;

    DatabaseUpdateChecker dbChecker(io,DB_TIMER_SECONDS);
    NetworkRequest networkRequestAcceptor(io,LISTENING_TCP_PORT);

    io.run();

    std::cout << "This won't be printed" << std::endl;  
    return 0;
}

, 5 TCP- 4444. , , telnet/netcat/ ....

telnet 127.0.0.1 4444
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
This is a response
Connection closed by foreign host.

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