//
// EchoServer.cpp
//
// $Id: //poco/1.3/Net/samples/EchoServer/src/EchoServer.cpp#1 $
//
// 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();
 // app.logger().information("Disconnecting " + _socket.peerAddress().toString());

 _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;
};


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

 void uninitialize()
 {
 ServerApplication::uninitialize();
 }

 void defineOptions(OptionSet& options)
 {
 ServerApplication::defineOptions(options);

 options.addOption(
 Option("help", "h", "display help information on command line arguments")
 .required(false)
 .repeatable(false));
 }

 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);
 }

 int main(const std::vector<std::string>& args)
 {
 if (_helpRequested)
 {
 displayHelp();
 }
 else
 {
 if (args.size() < 1) {
 printf("Usage: cmd port\n");
 return -10;
 }
 int port = atoi(args[0].c_str());
 // 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);
}