An IODevice consisting of an UDP socket. More...

#include <UDPSocketIODevice.h>

Inheritance diagram for nidas::core::UDPSocketIODevice:

Public Member Functions
	UDPSocketIODevice ()
	Create a UDPSocketIODevice. More...

	~UDPSocketIODevice ()

void	open (int flags) throw (nidas::util::IOException,nidas::util::InvalidParameterException)
	Open the socket, which does a socket bind to the remote address which is parsed from the contents of getName(). More...

int	getReadFd () const
	The file descriptor used when reading from this SocketIODevice. More...

int	getWriteFd () const
	The file descriptor used when writing to this device. More...

size_t	read (void *buf, size_t len) throw (nidas::util::IOException)
	Read from the device. More...

size_t	read (void *buf, size_t len, int msecTimeout) throw (nidas::util::IOException)
	Read from the device with a timeout in milliseconds. More...

size_t	write (const void *buf, size_t len) throw (nidas::util::IOException)
	Write to the device. More...

void	close () throw (nidas::util::IOException)
	close the device. More...

void	ioctl (int, void *, size_t) throw (nidas::util::IOException)

virtual void	setName (const std::string &val)
	Set the device name to be opened for this sensor. More...

virtual const std::string &	getName () const

virtual size_t	getBytesAvailable () const throw (nidas::util::IOException)
	Return how many bytes are available to read on this IODevice. More...

Static Public Member Functions
static void	parseAddress (const std::string &name, int &addrtype, std::string &hostname, int &port, std::string &bindaddr) throw (nidas::util::ParseException)
	Parse the getName() string to extract a socket type, destination address and optional port number. More...

Protected Member Functions
	UDPSocketIODevice (const UDPSocketIODevice &)
	No copy. More...

UDPSocketIODevice &	operator= (const UDPSocketIODevice &)
	No assignment. More...

Protected Attributes
nidas::util::DatagramSocket *	_socket
	The datagramsocket. More...

int	_addrtype
	The type of the destination address, AF_INET or AF_UNIX. More...

std::string	_desthost
	Destination host name from sensor name. More...

int	_port
	Port number that is parsed from sensor name. More...

nidas::util::auto_ptr < nidas::util::SocketAddress >	_sockAddr
	The destination socket address. More...

std::string	_bindAddr
	The local bind socket address. More...

Detailed Description

An IODevice consisting of an UDP socket.

Constructor & Destructor Documentation

UDPSocketIODevice::UDPSocketIODevice ( )

Create a UDPSocketIODevice.

No IO operations are performed in the constructor, hence no IOExceptions.

UDPSocketIODevice::~UDPSocketIODevice ( )

References close().

nidas::core::UDPSocketIODevice::UDPSocketIODevice ( const UDPSocketIODevice & )

protected

No copy.

Member Function Documentation

void UDPSocketIODevice::close	(		)
throw	(	nidas::util::IOException
	)

virtual

close the device.

Implements nidas::core::IODevice.

References _socket, nidas::util::DatagramSocket::close(), nidas::util::DatagramSocket::getFd(), nidas::util::Logger::getInstance(), nidas::core::IODevice::getName(), nidas::util::Logger::log(), and LOG_INFO.

Referenced by ~UDPSocketIODevice().

virtual size_t nidas::core::IODevice::getBytesAvailable	(		)	const
throw	(	nidas::util::IOException
	)

inlinevirtualinherited

Return how many bytes are available to read on this IODevice.

This method is only useful when ioctl FIONREAD is supported on this this IODevice, as for example with a UDP socket. It is not available, and not necessary, on most other devices, like serial ports, TCP sockets, or devices with nidas driver module support, in which case it will return an nidas::util::IOException. It is an optimization for use with UDP sockets, where after select determines that data is available on the socket file descriptor, a read will only read one datagram, even if there are more than one packet available, which would not be optimal if a sensor generated many small packets. Rather than returning back to select, we check if there are more datagrams to read. This is not necessary on other types of IODevices, where it is just a matter of using a big enough buffer to get all (or most) available data after a select.

According to man udp(7), FIONREAD will return 0 if the size of the next packet is 0. So, if select/poll indicate there is data available, one read at least should be done, just in case a sensor sends a datagram of length 0, otherwise it will never be consumed.

References err, nidas::core::IODevice::getName(), nidas::core::IODevice::getReadFd(), and nidas::core::IODevice::ioctl().

Referenced by nidas::core::DSMSensor::getBytesAvailable().

virtual const std::string& nidas::core::IODevice::getName ( ) const

inlinevirtualinherited

References nidas::core::IODevice::_devname.

Referenced by nidas::core::SerialPortIODevice::applyTermios(), nidas::core::TCPSocketIODevice::close(), close(), nidas::core::ServerSocketIODevice::close(), nidas::core::UnixIODevice::close(), nidas::core::IODevice::getBytesAvailable(), nidas::core::SocketIODevice::ioctl(), nidas::core::ServerSocketIODevice::ioctl(), nidas::core::UnixIODevice::ioctl(), nidas::core::SocketIODevice::open(), nidas::core::ServerSocketIODevice::open(), nidas::core::UnixIODevice::open(), nidas::core::UnixIODevice::read(), and nidas::core::UnixIODevice::write().

int nidas::core::UDPSocketIODevice::getReadFd ( ) const

inlinevirtual

The file descriptor used when reading from this SocketIODevice.

Implements nidas::core::IODevice.

References _socket, and nidas::util::DatagramSocket::getFd().

int nidas::core::UDPSocketIODevice::getWriteFd ( ) const

inlinevirtual

The file descriptor used when writing to this device.

Implements nidas::core::IODevice.

References _socket, and nidas::util::DatagramSocket::getFd().

void nidas::core::SocketIODevice::ioctl	(	int	,
		void *	,
		size_t
	)
throw	(	nidas::util::IOException
	)

inlinevirtualinherited

Implements nidas::core::IODevice.

References nidas::core::IODevice::getName().

void UDPSocketIODevice::open	(	int	flags	)
throw	(	nidas::util::IOException,
		nidas::util::InvalidParameterException
	)

virtual

Open the socket, which does a socket bind to the remote address which is parsed from the contents of getName().

See SocketIODevice::open() and SocketIODevice::parseAddress().

Reimplemented from nidas::core::SocketIODevice.

References nidas::util::Inet4SocketAddress::getInet4Address(), nidas::util::Inet4Address::isMultiCastAddress(), nidas::util::MulticastSocket::joinGroup(), and nidas::core::SocketIODevice::open().

UDPSocketIODevice& nidas::core::UDPSocketIODevice::operator= ( const UDPSocketIODevice & )

protected

No assignment.

void SocketIODevice::parseAddress	(	const std::string &	name,
		int &	addrtype,
		std::string &	hostname,
		int &	port,
		std::string &	bindaddr
	)
throw	(	nidas::util::ParseException
	)

staticinherited

Parse the getName() string to extract a socket type, destination address and optional port number.

The syntax of the set/getName() string is: ( "inet" | "sock" | "unix" | "blue" | "btspp" ) ':' address [:port] "inet" or "sock" indicate a TCP or UDP connection for use by derived classes implementing a TCP or UDP socket. The address field should then be a hostname which can be resolved to an IP address, or an IP address in dot notation. A port number is required for TCP/UDP socket connection. "unix" indicates a Unix socket connection, where address is the path name of the unix socket, for process to process communications. The port value is not used by unix sockets.

References port.

Referenced by nidas::dynld::raf::PSI9116_Sensor::open(), nidas::core::SocketIODevice::open(), and nidas::core::ServerSocketIODevice::open().

size_t nidas::core::UDPSocketIODevice::read	(	void *	buf,
		size_t	len
	)
throw	(	nidas::util::IOException
	)

inlinevirtual

Read from the device.

Implements nidas::core::IODevice.

References _socket, len, and nidas::util::DatagramSocket::recv().

size_t UDPSocketIODevice::read	(	void *	buf,
		size_t	len,
		int	msecTimeout
	)
throw	(	nidas::util::IOException
	)

virtual

Read from the device with a timeout in milliseconds.

Implements nidas::core::IODevice.

References len.

virtual void nidas::core::IODevice::setName ( const std::string & val )

inlinevirtualinherited

Set the device name to be opened for this sensor.

References nidas::core::IODevice::_devname.

Referenced by nidas::core::UnixIODevice::UnixIODevice().

size_t nidas::core::UDPSocketIODevice::write	(	const void *	buf,
		size_t	len
	)
throw	(	nidas::util::IOException
	)

inlinevirtual

Write to the device.

Implements nidas::core::IODevice.

References _socket, len, and nidas::util::DatagramSocket::send().

Member Data Documentation

int nidas::core::SocketIODevice::_addrtype

protectedinherited

The type of the destination address, AF_INET or AF_UNIX.

Referenced by nidas::core::SocketIODevice::open().

std::string nidas::core::SocketIODevice::_bindAddr

protectedinherited

The local bind socket address.

Referenced by nidas::core::SocketIODevice::open().

std::string nidas::core::SocketIODevice::_desthost

protectedinherited

Destination host name from sensor name.

Referenced by nidas::core::SocketIODevice::open().

int nidas::core::SocketIODevice::_port

protectedinherited

Port number that is parsed from sensor name.

For a server socket this is the local port number to listen on. For a remote connection socket this is the remote port number.

Referenced by nidas::core::SocketIODevice::open().

nidas::util::auto_ptr<nidas::util::SocketAddress> nidas::core::SocketIODevice::_sockAddr

protectedinherited

The destination socket address.

Referenced by nidas::core::SocketIODevice::open().

nidas::util::DatagramSocket* nidas::core::UDPSocketIODevice::_socket

protected

The datagramsocket.

This isn't in an auto_ptr because one must close the socket prior to deleting it. The nidas::util::Socket destructor does not close the file descriptor.

Referenced by close(), getReadFd(), getWriteFd(), read(), and write().

The documentation for this class was generated from the following files:

nidas/core/UDPSocketIODevice.h
nidas/core/UDPSocketIODevice.cc

Public Member Functions

Static Public Member Functions

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation