ACE_Asynch_Read_Stream Class Reference

This class is a factory for starting off asynchronous reads on a stream. This class forwards all methods to its implementation class. More...

#include <Asynch_IO.h>

Inheritance diagram for ACE_Asynch_Read_Stream:

Collaboration diagram for ACE_Asynch_Read_Stream:

List of all members.

Classes
class	Result
	This is the class which will be passed back to the ACE_Handler::handle_read_stream when the asynchronous read completes. This class forwards all the methods to the implementation classes. More...
Public Member Functions
	ACE_Asynch_Read_Stream (void)
	A do nothing constructor.
virtual	~ACE_Asynch_Read_Stream (void)
	Destructor.
int	open (ACE_Handler &handler, ACE_HANDLE handle=ACE_INVALID_HANDLE, const void *completion_key=0, ACE_Proactor *proactor=0)
int	read (ACE_Message_Block &message_block, size_t num_bytes_to_read, const void *act=0, int priority=0, int signal_number=ACE_SIGRTMIN)
int	readv (ACE_Message_Block &message_block, size_t num_bytes_to_read, const void *act=0, int priority=0, int signal_number=ACE_SIGRTMIN)
virtual ACE_Asynch_Operation_Impl *	implementation (void) const
	Return the underlying implementation class.
Protected Attributes
ACE_Asynch_Read_Stream_Impl *	implementation_
	Implementation class that all methods will be forwarded to.
Private Member Functions
void	operator= (const ACE_Asynch_Read_Stream &)
	ACE_Asynch_Read_Stream (const ACE_Asynch_Read_Stream &)

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Detailed Description

This class is a factory for starting off asynchronous reads on a stream. This class forwards all methods to its implementation class.

Once {open} is called, multiple asynchronous {read}s can started using this class. An ACE_Asynch_Read_Stream::Result will be passed back to the {handler} when the asynchronous reads completes through the {ACE_Handler::handle_read_stream} callback.

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Constructor & Destructor Documentation

ACE_Asynch_Read_Stream::ACE_Asynch_Read_Stream

(

void

)

A do nothing constructor.

ACE_Asynch_Read_Stream::~ACE_Asynch_Read_Stream

(

void

)

[virtual]

Destructor.

ACE_Asynch_Read_Stream::ACE_Asynch_Read_Stream

(

const ACE_Asynch_Read_Stream &

)

[private]

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Member Function Documentation

ACE_Asynch_Operation_Impl * ACE_Asynch_Read_Stream::implementation

(

void

)

const [virtual]

Return the underlying implementation class.

Implements ACE_Asynch_Operation.

Reimplemented in ACE_Asynch_Read_File.

int ACE_Asynch_Read_Stream::open	(	ACE_Handler &	handler,
		ACE_HANDLE	handle = ACE_INVALID_HANDLE,
		const void *	completion_key = 0,
		ACE_Proactor *	proactor = 0
	)

Initializes the factory with information which will be used with each asynchronous call.

Parameters:

handler	The ACE_Handler that will be called to handle completions for operations initiated using this factory.
handle	The handle that future read operations will use. If handle == ACE_INVALID_HANDLE, ACE_Handler::handle() will be called on @ handler to get the correct handle.

Return values:

0	for success.
-1	for failure; consult errno for further information.

Reimplemented from ACE_Asynch_Operation.

Reimplemented in ACE_Asynch_Read_File.

void ACE_Asynch_Read_Stream::operator=

(

const ACE_Asynch_Read_Stream &

)

[private]

int ACE_Asynch_Read_Stream::read	(	ACE_Message_Block &	message_block,
		size_t	num_bytes_to_read,
		const void *	act = 0,
		int	priority = 0,
		int	signal_number = ACE_SIGRTMIN
	)

Initiate an asynchronous read operation.

Parameters:

message_block	The ACE_Message_Block to receive the data. Received bytes will be placed in the block beginning at its current write pointer. If data is read, the message block's write pointer will be advanced by the number of bytes read.
num_bytes_to_read	The maximum number of bytes to read.
act	Asynchronous Completion Token; passed through to the completion handler in the Result object.
priority	Priority of the operation. On POSIX4-Unix, this is supported. Works like nice in Unix. Negative values are not allowed. 0 means priority of the operation same as the process priority. 1 means priority of the operation is one less than process priority, etc. Ignored on Windows.
signal_number	The POSIX4 real-time signal number to be used to signal completion of the operation. Values range from ACE_SIGRTMIN to ACE_SIGRTMAX. This argument is ignored on non-POSIX4 systems.

int ACE_Asynch_Read_Stream::readv	(	ACE_Message_Block &	message_block,
		size_t	num_bytes_to_read,
		const void *	act = 0,
		int	priority = 0,
		int	signal_number = ACE_SIGRTMIN
	)

Same as above but with scatter support, through chaining of composite message blocks using the continuation field.

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Member Data Documentation

ACE_Asynch_Read_Stream_Impl* ACE_Asynch_Read_Stream::implementation_ [protected]

Implementation class that all methods will be forwarded to.

Reimplemented in ACE_Asynch_Read_File.

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

• Asynch_IO.h
• Asynch_IO.cpp