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TimeServer.cpp

//
// TimeServer.cpp
//
// $Id: //poco/1.2/Net/samples/TimeServer/src/TimeServer.cpp#1 $
//
// This sample demonstrates the TCPServer and ServerSocket classes.
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// Permission is hereby granted, free of charge, to any person or organization
// obtaining a copy of the software and accompanying documentation covered by
// this license (the "Software") to use, reproduce, display, distribute,
// execute, and transmit the Software, and to prepare derivative works of the
// Software, and to permit third-parties to whom the Software is furnished to
// do so, all subject to the following:
// 
// The copyright notices in the Software and this entire statement, including
// the above license grant, this restriction and the following disclaimer,
// must be included in all copies of the Software, in whole or in part, and
// all derivative works of the Software, unless such copies or derivative
// works are solely in the form of machine-executable object code generated by
// a source language processor.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE, TITLE AND NON-INFRINGEMENT. IN NO EVENT
// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//


#include "Poco/Net/TCPServer.h"
#include "Poco/Net/TCPServerConnection.h"
#include "Poco/Net/TCPServerConnectionFactory.h"
#include "Poco/Net/TCPServerParams.h"
#include "Poco/Net/StreamSocket.h"
#include "Poco/Net/ServerSocket.h"
#include "Poco/Timestamp.h"
#include "Poco/DateTimeFormatter.h"
#include "Poco/DateTimeFormat.h"
#include "Poco/Exception.h"
#include "Poco/Util/ServerApplication.h"
#include "Poco/Util/Option.h"
#include "Poco/Util/OptionSet.h"
#include "Poco/Util/HelpFormatter.h"
#include <iostream>


using Poco::Net::ServerSocket;
using Poco::Net::StreamSocket;
using Poco::Net::TCPServerConnection;
using Poco::Net::TCPServerConnectionFactory;
using Poco::Net::TCPServer;
using Poco::Timestamp;
using Poco::DateTimeFormatter;
using Poco::DateTimeFormat;
using Poco::Util::ServerApplication;
using Poco::Util::Application;
using Poco::Util::Option;
using Poco::Util::OptionSet;
using Poco::Util::HelpFormatter;


00067 class TimeServerConnection: public TCPServerConnection
      /// This class handles all client connections.
      ///
      /// A string with the current date and time is sent back to the client.
{
public:
      TimeServerConnection(const StreamSocket& s, const std::string& format): 
            TCPServerConnection(s),
            _format(format)
      {
      }
      
      void run()
      {
            Application& app = Application::instance();
            app.logger().information("Request from " + this->socket().peerAddress().toString());
            try
            {
                  Timestamp now;
                  std::string dt(DateTimeFormatter::format(now, _format));
                  dt.append("\r\n");
                  socket().sendBytes(dt.data(), (int) dt.length());
            }
            catch (Poco::Exception& exc)
            {
                  app.logger().log(exc);
            }
      }
      
private:
      std::string _format;
};


00101 class TimeServerConnectionFactory: public TCPServerConnectionFactory
      /// A factory for TimeServerConnection.
{
public:
      TimeServerConnectionFactory(const std::string& format):
            _format(format)
      {
      }
      
00110       TCPServerConnection* createConnection(const StreamSocket& socket)
      {
            return new TimeServerConnection(socket, _format);
      }

private:
      std::string _format;
};


00120 class TimeServer: public Poco::Util::ServerApplication
      /// The main application class.
      ///
      /// This class handles command-line arguments and
      /// configuration files.
      /// Start the TimeServer executable with the help
      /// option (/help on Windows, --help on Unix) for
      /// the available command line options.
      ///
      /// To use the sample configuration file (TimeServer.properties),
      /// copy the file to the directory where the TimeServer executable
      /// resides. If you start the debug version of the TimeServer
      /// (TimeServerd[.exe]), you must also create a copy of the configuration
      /// file named TimeServerd.properties. In the configuration file, you
      /// can specify the port on which the server is listening (default
      /// 9911) and the format of the date/time string sent back to the client.
      ///
      /// To test the TimeServer you can use any telnet client (telnet localhost 9911).
{
public:
      TimeServer(): _helpRequested(false)
      {
      }
      
      ~TimeServer()
      {
      }

protected:
00149       void initialize(Application& self)
      {
            loadConfiguration(); // load default configuration files, if present
            ServerApplication::initialize(self);
      }
            
00155       void uninitialize()
      {
            ServerApplication::uninitialize();
      }

00160       void defineOptions(OptionSet& options)
      {
            ServerApplication::defineOptions(options);
            
            options.addOption(
                  Option("help", "h", "display help information on command line arguments")
                        .required(false)
                        .repeatable(false));
      }

00170       void handleOption(const std::string& name, const std::string& value)
      {
            ServerApplication::handleOption(name, value);

            if (name == "help")
                  _helpRequested = true;
      }

      void displayHelp()
      {
            HelpFormatter helpFormatter(options());
            helpFormatter.setCommand(commandName());
            helpFormatter.setUsage("OPTIONS");
            helpFormatter.setHeader("A server application that serves the current date and time.");
            helpFormatter.format(std::cout);
      }

00187       int main(const std::vector<std::string>& args)
      {
            if (_helpRequested)
            {
                  displayHelp();
            }
            else
            {
                  // get parameters from configuration file
                  unsigned short port = (unsigned short) config().getInt("TimeServer.port", 9911);
                  std::string format(config().getString("TimeServer.format", DateTimeFormat::ISO8601_FORMAT));
                  
                  // set-up a server socket
                  ServerSocket svs(port);
                  // set-up a TCPServer instance
                  TCPServer srv(new TimeServerConnectionFactory(format), svs);
                  // start the TCPServer
                  srv.start();
                  // wait for CTRL-C or kill
                  waitForTerminationRequest();
                  // Stop the TCPServer
                  srv.stop();
            }
            return Application::EXIT_OK;
      }
      
private:
      bool _helpRequested;
};


int main(int argc, char** argv)
{
      TimeServer app;
      return app.run(argc, argv);
}

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