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EchoServer.cpp

//
// EchoServer.cpp
//
// $Id: //poco/1.2/Net/samples/EchoServer/src/EchoServer.cpp#3 $
//
// This sample demonstrates the SocketReactor and SocketAcceptor 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/SocketReactor.h"
#include "Poco/Net/SocketAcceptor.h"
#include "Poco/Net/SocketNotification.h"
#include "Poco/Net/StreamSocket.h"
#include "Poco/Net/ServerSocket.h"
#include "Poco/NObserver.h"
#include "Poco/Exception.h"
#include "Poco/Thread.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::SocketReactor;
using Poco::Net::SocketAcceptor;
using Poco::Net::ReadableNotification;
using Poco::Net::ShutdownNotification;
using Poco::Net::ServerSocket;
using Poco::Net::StreamSocket;
using Poco::NObserver;
using Poco::AutoPtr;
using Poco::Thread;
using Poco::Util::ServerApplication;
using Poco::Util::Application;
using Poco::Util::Option;
using Poco::Util::OptionSet;
using Poco::Util::HelpFormatter;


class EchoServiceHandler
{
public:
      EchoServiceHandler(StreamSocket& socket, SocketReactor& reactor):
            _socket(socket),
            _reactor(reactor),
            _pBuffer(new char[BUFFER_SIZE])
      {
            Application& app = Application::instance();
            app.logger().information("Connection from " + socket.peerAddress().toString());

            _reactor.addEventHandler(_socket, NObserver<EchoServiceHandler, ReadableNotification>(*this, &EchoServiceHandler::onReadable));
            _reactor.addEventHandler(_socket, NObserver<EchoServiceHandler, ShutdownNotification>(*this, &EchoServiceHandler::onShutdown));
      }
      
      ~EchoServiceHandler()
      {
            Application& app = Application::instance();
            try
            {
                  app.logger().information("Disconnecting " + _socket.peerAddress().toString());
            }
            catch (...)
            {
            }
            _reactor.removeEventHandler(_socket, NObserver<EchoServiceHandler, ReadableNotification>(*this, &EchoServiceHandler::onReadable));
            _reactor.removeEventHandler(_socket, NObserver<EchoServiceHandler, ShutdownNotification>(*this, &EchoServiceHandler::onShutdown));
            delete [] _pBuffer;
      }
      
      void onReadable(const AutoPtr<ReadableNotification>& pNf)
      {
            int n = _socket.receiveBytes(_pBuffer, BUFFER_SIZE);
            if (n > 0)
                  _socket.sendBytes(_pBuffer, n);
            else
                  delete this;
      }
      
      void onShutdown(const AutoPtr<ShutdownNotification>& pNf)
      {
            delete this;
      }
      
private:
      enum
      {
            BUFFER_SIZE = 1024
      };
      
      StreamSocket   _socket;
      SocketReactor& _reactor;
      char*          _pBuffer;
};


00122 class EchoServer: public Poco::Util::ServerApplication
      /// The main application class.
      ///
      /// This class handles command-line arguments and
      /// configuration files.
      /// Start the EchoServer executable with the help
      /// option (/help on Windows, --help on Unix) for
      /// the available command line options.
      ///
      /// To use the sample configuration file (EchoServer.properties),
      /// copy the file to the directory where the EchoServer executable
      /// resides. If you start the debug version of the EchoServer
      /// (EchoServerd[.exe]), you must also create a copy of the configuration
      /// file named EchoServerd.properties. In the configuration file, you
      /// can specify the port on which the server is listening (default
      /// 9977) and the format of the date/time string sent back to the client.
      ///
      /// To test the EchoServer you can use any telnet client (telnet localhost 9977).
{
public:
      EchoServer(): _helpRequested(false)
      {
      }
      
      ~EchoServer()
      {
      }

protected:
00151       void initialize(Application& self)
      {
            loadConfiguration(); // load default configuration files, if present
            ServerApplication::initialize(self);
      }
            
00157       void uninitialize()
      {
            ServerApplication::uninitialize();
      }

00162       void defineOptions(OptionSet& options)
      {
            ServerApplication::defineOptions(options);
            
            options.addOption(
                  Option("help", "h", "display help information on command line arguments")
                        .required(false)
                        .repeatable(false));
      }

00172       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("An echo server implemented using the Reactor and Acceptor patterns.");
            helpFormatter.format(std::cout);
      }

00189       int main(const std::vector<std::string>& args)
      {
            if (_helpRequested)
            {
                  displayHelp();
            }
            else
            {
                  // get parameters from configuration file
                  unsigned short port = (unsigned short) config().getInt("EchoServer.port", 9977);
                  
                  // set-up a server socket
                  ServerSocket svs(port);
                  // set-up a SocketReactor...
                  SocketReactor reactor;
                  // ... and a SocketAcceptor
                  SocketAcceptor<EchoServiceHandler> acceptor(svs, reactor);
                  // run the reactor in its own thread so that we can wait for 
                  // a termination request
                  Thread thread;
                  thread.start(reactor);
                  // wait for CTRL-C or kill
                  waitForTerminationRequest();
                  // Stop the SocketReactor
                  reactor.stop();
                  thread.join();
            }
            return Application::EXIT_OK;
      }
      
private:
      bool _helpRequested;
};


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

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