Class for IO on connection oriented socket. More...

#include <StreamIO.h>

Inheritance diagram for casa::StreamIO:

Public Member Functions
	StreamIO (const String &hostname, uShort portNumber)
	Construct a stream that is attached to the specified host on the specified portnumber.
virtual	~StreamIO ()
	The destructor closes the file.
virtual void	write (uInt size, const void *buf)
	Write the specified number of bytes.
virtual Int	read (uInt size, void *buf, Bool throwException=True)
	Read `size` bytes from the tape.
virtual Int64	length ()
	Get the length of the stream.
virtual Bool	isReadable () const
	Is the stream readabale? This function always returns True.
virtual Bool	isWritable () const
	Is the tape device writable? This function always returns True.
virtual Bool	isSeekable () const
	Is the tape device seekable? This function always returns False.
Protected Member Functions
virtual Int64	doSeek (Int64 offset, ByteIO::SeekOption)
	Reset the position pointer to the given value.
Private Member Functions
	StreamIO (const StreamIO &other)
	The following functions are made private so that the compiler does not generate default ones.
StreamIO &	operator= (const StreamIO &other)
Private Attributes
int	itsSockDesc

Detailed Description

Class for IO on connection oriented socket.

Intended use:

Public interface

 <h3>Review Status</h3><dl><dt>Date Reviewed:<dd>yyyy/mm/dd</dl>

Prerequisite

ByteIO class
Tape descriptors

Synopsis

This class is a specialization of class ByteIO . It uses a file descriptor to read/write data to a Internet (AF_INET) stream.

Example

Motivation

This class was needed for the online version of the VLA filler.

Definition at line 65 of file StreamIO.h.

Constructor & Destructor Documentation

casa::StreamIO::StreamIO	(	const String &	hostname,
		uShort	portNumber
	)

Construct a stream that is attached to the specified host on the specified portnumber.

Name lookup is not currently done so that the dotted quad notation must be used.

virtual casa::StreamIO::~StreamIO ( ) [virtual]

The destructor closes the file.

casa::StreamIO::StreamIO ( const StreamIO & other ) [private]

The following functions are made private so that the compiler does not generate default ones.

They cannot be used and are not defined.

Member Function Documentation

virtual Int64 casa::StreamIO::doSeek	(	Int64	offset,
		ByteIO::SeekOption
	)		`[protected, virtual]`

Reset the position pointer to the given value.

It returns the new position. As stream devices are not seekable calling this function will always throw an AipsError exception.

Implements casa::ByteIO.

virtual Bool casa::StreamIO::isReadable ( ) const [virtual]

Is the stream readabale? This function always returns True.

Implements casa::ByteIO.

virtual Bool casa::StreamIO::isSeekable ( ) const [virtual]

Is the tape device seekable? This function always returns False.

Implements casa::ByteIO.

virtual Bool casa::StreamIO::isWritable ( ) const [virtual]

Is the tape device writable? This function always returns True.

Implements casa::ByteIO.

virtual Int64 casa::StreamIO::length ( ) [virtual]

Get the length of the stream.

Not a meaningful function for this class and this function always returns -1.

Implements casa::ByteIO.

StreamIO& casa::StreamIO::operator= ( const StreamIO & other ) [private]

virtual Int casa::StreamIO::read	(	uInt	size,
		void *	buf,
		Bool	throwException = `True`
	)		`[virtual]`

Read size bytes from the tape.

Returns the number of bytes actually read or a negative number if an error occured. Will throw an exception (AipsError) if the requested number of bytes could not be read, or an error occured, unless throwException is set to False.

Implements casa::ByteIO.