Null channel that doesn't write or read any data. More...

#include <mdsChannel.h>

Inheritance diagram for mds::mod::CNullChannel:

[legend]

Public Types
enum	{ CLASS_OBJECT }
	Templates that require members of the CObject class can use this enum to check the existence. More...
enum	{ HEAP_OBJECT = 0x70616568 }
	Signature used to recognize objects on the heap. More...
typedef mds::base::CLibraryLockableObject < CChannel >::CLock	tLock
	Lock that have to be used to provide mutual access to write(), read() and etc.
Public Member Functions
bool	checkMedium (int Medium) const
	Checks if channel medium is equal to a given value.
bool	checkType (int Type) const
	Checks if channel type corresponds to a given value.
void	clearNumOfBytes ()
	Clears the number of read an written bytes.
	CNullChannel (int Type)
	Constructor.
virtual bool	connect (unsigned uTimeout=CH_CONNECTION_TIMEOUT)
	Connects to the opposite channel side.
virtual void	disconnect ()
	Disconnects from the opossite channel side.
virtual bool	flush ()
	Finalizes all writing/reading operations (flushes internal buffers, etc.).
int	getMedium () const
	Returns the channel medium.
int	getNumOfReadBytes ()
	Returns the number of bytes read from the channel.
int	getNumOfWrittenBytes ()
	Returns the number of bytes written to the channel.
int	getReferencesCount () const
	Returns the number of references.
int	getType () const
	Method returns the channel type.
virtual bool	isConnected ()
	Method for testing channel errors such as: disconnected or broken channel, reading after end of input, etc.
bool	isOnHeap () const
	Returns true if the object is allocated on the heap.
virtual bool	listen (unsigned uTimeout=CH_CONNECTION_TIMEOUT)
	Listens for and accepts an incoming connection.
void	lock ()
	Locks the object.
	MDS_SHAREDPTR (CChannel)
	Smart pointer type.
	MDS_SHAREDPTR (CNullChannel)
	Smart pointer type.
virtual int	read (char *pcData, int iLength)
	Increases an internal counter of read bytes.
virtual bool	skip (int iLength)
	Skips a given number of bytes.
void	unlock ()
	Locks the object.
virtual bool	wait (unsigned uTimeout=CH_WAIT_TIMEOUT)
	Waits for data.
virtual bool	write (const char *pcData, int iLength)
	Increases an internal counter of written bytes.
virtual	~CNullChannel ()
	Destructor.
Static Public Member Functions
static CChannel *	create (EChannelType eType, const std::string &sDesc)
	Creation of a channel which is described by a textual string.
static void *	operator new (std::size_t Size)
	Allocates a new object on the heap.
static void	separate (const std::string &sDescs, std::vector< std::string > &Descs)
	Parses a given string and separates descriptions of several channels.
Protected Member Functions
void	addReference () const
	Increase the reference counter.
bool	delReference () const
	Decrease the reference counter.
Protected Attributes
int	m_iHeapObject
	Flag initialized if the object is on the heap.
int	m_iReadCount
	The number of read/written bytes.
int	m_iReferences
	The number of references to the object.
int	m_iWrittenCount
int	m_Medium
	Channel medium.
int	m_Type
	Channel type.

Detailed Description

Null channel that doesn't write or read any data.

It just counts the number of written and read bytes of data.

This channel is bidirectional. It can be opened for reading and writing simultaneously.

Member Typedef Documentation

typedef mds::base::CLibraryLockableObject<CChannel>::CLock mds::mod::CChannel::tLock [inherited]

Lock that have to be used to provide mutual access to write(), read() and etc.

functions.

Member Enumeration Documentation

anonymous enum [inherited]

Templates that require members of the CObject class can use this enum to check the existence.

Enumerator:

CLASS_OBJECT

anonymous enum [inherited]

Signature used to recognize objects on the heap.

Enumerator:

HEAP_OBJECT

Constructor & Destructor Documentation

mds::mod::CNullChannel::CNullChannel ( int Type )

Constructor.

Channel type.

virtual mds::mod::CNullChannel::~CNullChannel ( ) [virtual]

Destructor.

Member Function Documentation

void mds::base::CObject::addReference ( ) const [protected, inherited]

Increase the reference counter.

bool mds::mod::CChannel::checkMedium ( int Medium ) const [inherited]

Checks if channel medium is equal to a given value.

bool mds::mod::CChannel::checkType ( int Type ) const [inherited]

Checks if channel type corresponds to a given value.

void mds::mod::CNullChannel::clearNumOfBytes ( )

Clears the number of read an written bytes.

virtual bool mds::mod::CNullChannel::connect ( unsigned uTimeout = CH_CONNECTION_TIMEOUT ) [virtual]

Connects to the opposite channel side.

If the channel is connection oriented, this function must be called on the client side before any communication!
Returns false on failure or timeout elapsed.

Implements mds::mod::CChannel.

CChannel * mds::mod::CChannel::create	(	EChannelType	eType,
		const std::string &	sDesc
	)		`[static, inherited]`

Creation of a channel which is described by a textual string.

String has the form: "chmedium[:chattrib1[:chattrib2[:...]]]".
Actually, the channel medium can be "stdio", "file", "pipe" and "shm".
Channel attributes depend on the medium.
"stdio" has empty attributes, "file" (:filename), "pipe" (:pipename) and "shm" (:shmname).
Throws CCannotCreate exception on failure!

bool mds::base::CObject::delReference ( ) const [protected, inherited]

Decrease the reference counter.

Returns true if the decremented number of references is lower or equal to zero and object must be deleted.

virtual void mds::mod::CNullChannel::disconnect ( ) [virtual]

Disconnects from the opossite channel side.

The function can be called on the server or client side.

Implements mds::mod::CChannel.

virtual bool mds::mod::CNullChannel::flush ( ) [virtual]

Finalizes all writing/reading operations (flushes internal buffers, etc.).

Implements mds::mod::CChannel.

int mds::mod::CChannel::getMedium ( ) const [inherited]

Returns the channel medium.

int mds::mod::CNullChannel::getNumOfReadBytes ( )

Returns the number of bytes read from the channel.

int mds::mod::CNullChannel::getNumOfWrittenBytes ( )

Returns the number of bytes written to the channel.

int mds::base::CObject::getReferencesCount ( ) const [inherited]

Returns the number of references.

int mds::mod::CChannel::getType ( ) const [inherited]

Method returns the channel type.

virtual bool mds::mod::CNullChannel::isConnected ( ) [virtual]

Method for testing channel errors such as: disconnected or broken channel, reading after end of input, etc.

The function can be called on the server or client side.

Implements mds::mod::CChannel.

bool mds::base::CObject::isOnHeap ( ) const [inherited]

Returns true if the object is allocated on the heap.

virtual bool mds::mod::CNullChannel::listen ( unsigned uTimeout = CH_CONNECTION_TIMEOUT ) [virtual]

Listens for and accepts an incoming connection.

If the channel is connection oriented, this function must be called on the server side before any communication!
Returns false on failure or timeout elapsed.

Implements mds::mod::CChannel.

void mds::base::CLockableObject< CChannel >::lock ( ) [inherited]

Locks the object.

mds::mod::CChannel::MDS_SHAREDPTR ( CChannel ) [inherited]

Smart pointer type.

mds::mod::CNullChannel::MDS_SHAREDPTR ( CNullChannel )

Smart pointer type.

static void* mds::base::CObject::operator new ( std::size_t Size ) [static, inherited]

Allocates a new object on the heap.

virtual int mds::mod::CNullChannel::read	(	char *	pcData,
		int	iLength
	)		`[virtual]`

Increases an internal counter of read bytes.

The function always returns the required number of bytes.

Implements mds::mod::CChannel.

void mds::mod::CChannel::separate	(	const std::string &	sDescs,
		std::vector< std::string > &	Descs
	)		`[static, inherited]`

Parses a given string and separates descriptions of several channels.

Channels are separated by two successive colons "::" in the string.
Example: "chmedium1[:chattribs1][::chmedium2[:chattribs2][::...]]".

bool mds::mod::CChannel::skip ( int iLength ) [virtual, inherited]

Skips a given number of bytes.

If the channel is open for readinpg, the data are discarded. Otherwise, zeros are written to the output channel.
This method cannot be used if the channel is opened for reading and writting simultaneously!

Reimplemented in mds::mod::CSharedMemChannel, and mds::mod::CMemoryChannel.

void mds::base::CLockableObject< CChannel >::unlock ( ) [inherited]

Locks the object.

virtual bool mds::mod::CNullChannel::wait ( unsigned uTimeout = CH_WAIT_TIMEOUT ) [virtual]