A data stream, with low-level (not-endian safe) read/write functions. More...

#include <dashel.h>

Inheritance diagram for Dashel::Stream:

Public Member Functions
void	fail (DashelException::Source s, int se, const char *reason)
	Set stream to failed state.
bool	failed () const
	Query failed state of stream.
virtual void	flush ()=0
	Flushes stream.
const std::string &	getFailReason () const
	Returns the reason the stream has failed.
const std::string &	getProtocolName () const
	Returns the protocol name of the stream.
std::string	getTargetName () const
	Returns the name of the target.
const std::string &	getTargetParameter (const char *param) const
	Returns the value of a parameter extracted from the target.
virtual void	read (void *data, size_t size)=0
	Reads data from the stream.
template<typename T >
T	read ()
	Read a variable of basic type from the stream.
virtual void	write (const void *data, const size_t size)=0
	Write data to the stream.
template<typename T >
void	write (T v)
	Write a variable of basic type to the stream.
Protected Member Functions
	Stream (const std::string &protocolName)
	Constructor.
virtual	~Stream ()
	Virtual destructor, to ensure calls to destructors of sub-classes.
Protected Attributes
std::string	protocolName
	The protocol name.
ParameterSet	target
	The target description.
Private Attributes
bool	failedFlag
	A flag indicating that the stream has failed.
std::string	failReason
	The human readable reason describing why the stream has failed.
Friends
class	Hub

Detailed Description

A data stream, with low-level (not-endian safe) read/write functions.

Definition at line 262 of file dashel.h.

Constructor & Destructor Documentation

Dashel::Stream::Stream ( const std::string & protocolName ) [inline, protected]

Constructor.

Definition at line 281 of file dashel.h.

virtual Dashel::Stream::~Stream ( ) [inline, protected, virtual]

Virtual destructor, to ensure calls to destructors of sub-classes.

Definition at line 284 of file dashel.h.

Member Function Documentation

void Dashel::Stream::fail	(	DashelException::Source	s,
		int	se,
		const char *	reason
	)

Set stream to failed state.

Parameters:

s	Source of failure
se	System error code
reason	The logical reason as a human readable string.

Definition at line 108 of file dashel-posix.cpp.

bool Dashel::Stream::failed ( ) const [inline]

Query failed state of stream.

Returns:: true if stream has failed.

Definition at line 297 of file dashel.h.

virtual void Dashel::Stream::flush ( ) [pure virtual]

Flushes stream.

Calling this function requests the stream to be flushed, this may ensure that data is written to physical media or actually sent over a wire. The exact performed function depends on the stream type and operating system.

Implemented in Dashel::SocketStream, Dashel::SerialStream, Dashel::FileDescriptorStream, Dashel::FileStream, Dashel::SocketServerStream, Dashel::StdoutStream, Dashel::SocketStream, Dashel::StdinStream, Dashel::SocketServerStream, and Dashel::MemoryPacketStream.

const std::string& Dashel::Stream::getFailReason ( ) const [inline]

Returns the reason the stream has failed.

Returns:: the reason the stream has failed, or an empty string if fail() is false.

Definition at line 302 of file dashel.h.

const std::string& Dashel::Stream::getProtocolName ( ) const [inline]

Returns the protocol name of the stream.

Definition at line 305 of file dashel.h.

std::string Dashel::Stream::getTargetName ( ) const [inline]

Returns the name of the target.

The name of the target contains all parameters and the protocol name.

Returns:: Name of the target

Definition at line 312 of file dashel.h.

const std::string& Dashel::Stream::getTargetParameter ( const char * param ) const [inline]

Returns the value of a parameter extracted from the target.

Parameters:

param the name of the parameter

Returns:: A string containing the parameter.

Definition at line 318 of file dashel.h.

virtual void Dashel::Stream::read	(	void *	data,
		size_t	size
	)		`[pure virtual]`

Reads data from the stream.

Reads all requested data from the stream, blocking until all the data has been read, or some error occurs. Errors are signaled by throwing a DashelException exception, which may be caused either by device errors or reaching the end of file.

Parameters:

data	Pointer to the memory where the read data should be stored.
size	Amount of data to read in bytes.

Implemented in Dashel::SocketStream, Dashel::FileDescriptorStream, Dashel::FileStream, Dashel::SocketServerStream, Dashel::StdoutStream, Dashel::SocketStream, Dashel::StdinStream, Dashel::SocketServerStream, and Dashel::MemoryPacketStream.

template<typename T >

T Dashel::Stream::read ( ) [inline]

Read a variable of basic type from the stream.

This function does not perform any endian conversion.

Returns:: variable to read.

Definition at line 362 of file dashel.h.

virtual void Dashel::Stream::write	(	const void *	data,
		const size_t	size
	)		`[pure virtual]`

Write data to the stream.

Writes all requested data to the stream, blocking until all the data has been written, or some error occurs. Errors are signaled by throwing a DashelException exception. This function does not flush devices, therefore the data may not really have been written on return, but only been buffered. In order to flush the stream, call flush().

Parameters: