Channel over shared memory. More...

#include <mdsChannel.h>

Inheritance diagram for mds::mod::CSharedMemChannel:

[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.
virtual bool	connect (unsigned uTimeout=CH_CONNECTION_TIMEOUT)
	Connects to the opposite channel side.
	CSharedMemChannel (int Type, const std::string &ssName)
	Constructor.
virtual void	disconnect ()
	Disconnects from the opossite channel side.
virtual bool	flush ()
	Finalizes all writing/reading operations (flushes internal buffers, etc.).
char *	getDataPtr ()
	Returns current pointer to the remaining (unread) data.
int	getMedium () const
	Returns the channel medium.
int	getReferencesCount () const
	Returns the number of references.
mds::sys::CSharedMem *	getSharedMemPtr ()
	Returns pointer to the shared memory.
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 (CSharedMemChannel)
	Smart pointer type.
virtual int	read (char *pcData, int iLength)
	Reads bytes from the input channel.
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)
	Writes data to the output channel.
virtual	~CSharedMemChannel ()
	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_iNumOfBytes
	The number of bytes remaining in the shared memory.
int	m_iReferences
	The number of references to the object.
int	m_Medium
	Channel medium.
char *	m_pcData
	Pointer to the data byte in the shared memory.
int *	m_piNumOfWrittenBytes
	Pointer to the number of bytes written to the shared memory.
mds::sys::CSemaphorePtr	m_spSemaphore
	Named semaphore used to lock the shared memory.
mds::sys::CSharedMemPtr	m_spSharedMem
	Shared memory.
int	m_Type
	Channel type.

Detailed Description

Channel over shared memory.

Only for testing!

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::CSharedMemChannel::CSharedMemChannel	(	int	Type,
		const std::string &	ssName
	)

Constructor.

Opens an existing shared memory.
Allowed channel types are CH_IN and CH_OUT.
Name of the shared memory.
This channel cannot be opened for input and output simultaneously! Constructor throws exception in this case!

mds::mod::CSharedMemChannel::~CSharedMemChannel ( ) [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.

bool mds::mod::CSharedMemChannel::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.

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

Disconnects from the opossite channel side.

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

Implements mds::mod::CChannel.

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

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

Implements mds::mod::CChannel.

char* mds::mod::CSharedMemChannel::getDataPtr ( )

Returns current pointer to the remaining (unread) data.

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

Returns the channel medium.

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

Returns the number of references.

mds::sys::CSharedMem* mds::mod::CSharedMemChannel::getSharedMemPtr ( )

Returns pointer to the shared memory.

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

Method returns the channel type.

bool mds::mod::CSharedMemChannel::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.

bool mds::mod::CSharedMemChannel::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::CSharedMemChannel::MDS_SHAREDPTR ( CSharedMemChannel )

Smart pointer type.

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

Allocates a new object on the heap.