//
// StreamSocket.h
//
// Library: Net
// Package: Sockets
// Module:  StreamSocket
//
// Definition of the StreamSocket class.
//
// Copyright (c) 2005-2006, Applied Informatics Software Engineering GmbH.
// and Contributors.
//
// SPDX-License-Identifier:	BSL-1.0
//


#ifndef Net_StreamSocket_INCLUDED
#define Net_StreamSocket_INCLUDED


#include "Poco/Net/Net.h"
#include "Poco/Net/Socket.h"
#include "Poco/FIFOBuffer.h"


namespace Poco {
namespace Net {


class StreamSocketImpl;


class Net_API StreamSocket: public Socket
	/// This class provides an interface to a
	/// TCP stream socket.
{
public:
	StreamSocket();
		/// Creates an unconnected stream socket.
		///
		/// Before sending or receiving data, the socket
		/// must be connected with a call to connect().

	explicit StreamSocket(const SocketAddress& address);
		/// Creates a stream socket and connects it to
		/// the socket specified by address.

	explicit StreamSocket(SocketAddress::Family family);
		/// Creates an unconnected stream socket
		/// for the given address family.
		///
		/// This is useful if certain socket options
		/// (like send and receive buffer) sizes, that must 
		/// be set before connecting the socket, will be
		/// set later on.

	StreamSocket(const Socket& socket);
		/// Creates the StreamSocket with the SocketImpl
		/// from another socket. The SocketImpl must be
		/// a StreamSocketImpl, otherwise an InvalidArgumentException
		/// will be thrown.

	virtual ~StreamSocket();
		/// Destroys the StreamSocket.

	StreamSocket& operator = (const Socket& socket);
		/// Assignment operator.
		///
		/// Releases the socket's SocketImpl and
		/// attaches the SocketImpl from the other socket and
		/// increments the reference count of the SocketImpl.	

	void connect(const SocketAddress& address);
		/// Initializes the socket and establishes a connection to 
		/// the TCP server at the given address.
		///
		/// Can also be used for UDP sockets. In this case, no
		/// connection is established. Instead, incoming and outgoing
		/// packets are restricted to the specified address.

	void connect(const SocketAddress& address, const Poco::Timespan& timeout);
		/// Initializes the socket, sets the socket timeout and 
		/// establishes a connection to the TCP server at the given address.

	void connectNB(const SocketAddress& address);
		/// Initializes the socket and establishes a connection to 
		/// the TCP server at the given address. Prior to opening the
		/// connection the socket is set to nonblocking mode.

	void shutdownReceive();
		/// Shuts down the receiving part of the socket connection.
		
	void shutdownSend();
		/// Shuts down the sending part of the socket connection.
		
	void shutdown();
		/// Shuts down both the receiving and the sending part
		/// of the socket connection.
	
	int sendBytes(const void* buffer, int length, int flags = 0);
		/// Sends the contents of the given buffer through
		/// the socket.
		///
		/// Returns the number of bytes sent, which may be
		/// less than the number of bytes specified.
		///
		/// Certain socket implementations may also return a negative
		/// value denoting a certain condition.

	int sendBytes(Poco::FIFOBuffer& buffer);
		/// Sends the contents of the given buffer through
		/// the socket. FIFOBuffer has writable/readable transition
		/// notifications which may be enabled to notify the caller when
		/// the buffer transitions between empty, partially full and
		/// full states.
		///
		/// Returns the number of bytes sent, which may be
		/// less than the number of bytes specified.
		///
		/// Certain socket implementations may also return a negative
		/// value denoting a certain condition.

	int receiveBytes(void* buffer, int length, int flags = 0);
		/// Receives data from the socket and stores it
		/// in buffer. Up to length bytes are received.
		///
		/// Returns the number of bytes received. 
		/// A return value of 0 means a graceful shutdown 
		/// of the connection from the peer.
		///
		/// Throws a TimeoutException if a receive timeout has
		/// been set and nothing is received within that interval.
		/// Throws a NetException (or a subclass) in case of other errors.

	int receiveBytes(Poco::FIFOBuffer& buffer);
		/// Receives data from the socket and stores it
		/// in buffer. Up to length bytes are received. FIFOBuffer has 
		/// writable/readable transition notifications which may be enabled 
		/// to notify the caller when the buffer transitions between empty, 
		/// partially full and full states.
		///
		/// Returns the number of bytes received. 
		/// A return value of 0 means a graceful shutdown 
		/// of the connection from the peer.
		///
		/// Throws a TimeoutException if a receive timeout has
		/// been set and nothing is received within that interval.
		/// Throws a NetException (or a subclass) in case of other errors.

	void sendUrgent(unsigned char data);
		/// Sends one byte of urgent data through
		/// the socket.
		///
		/// The data is sent with the MSG_OOB flag.
		///
		/// The preferred way for a socket to receive urgent data
		/// is by enabling the SO_OOBINLINE option.

	StreamSocket(SocketImpl* pImpl);
		/// Creates the Socket and attaches the given SocketImpl.
		/// The socket takes ownership of the SocketImpl.
		///
		/// The SocketImpl must be a StreamSocketImpl, otherwise
		/// an InvalidArgumentException will be thrown.

private:
	enum
	{
		BUFFER_SIZE = 1024
	};

	friend class ServerSocket;
	friend class SocketIOS;
};


} } // namespace Poco::Net


#endif // Net_StreamSocket_INCLUDED
