ACE_Asynch_Read_Dgram Class Reference

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

#include <Asynch_IO.h>

Inheritance diagram for ACE_Asynch_Read_Dgram:

Collaboration diagram for ACE_Asynch_Read_Dgram:

Classes
class	Result
	This is the class which will be passed back to the {handler} when the asynchronous read completes. This class forwards all the methods to the implementation classes. More...

Public Member Functions
	ACE_Asynch_Read_Dgram (void)
	A do nothing constructor. More...
virtual	~ACE_Asynch_Read_Dgram (void)
	Destructor. More...
int	open (ACE_Handler &handler, ACE_HANDLE handle=ACE_INVALID_HANDLE, const void *completion_key=0, ACE_Proactor *proactor=0)
ssize_t	recv (ACE_Message_Block *message_block, size_t &number_of_bytes_recvd, int flags, int protocol_family=PF_INET, 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. More...
Public Member Functions inherited from ACE_Asynch_Operation
int	open (ACE_Handler &handler, ACE_HANDLE handle, const void *completion_key, ACE_Proactor *proactor)
int	cancel (void)
ACE_Proactor *	proactor (void) const
	Return the underlying proactor. More...
virtual	~ACE_Asynch_Operation (void)
	Destructor. More...

Protected Attributes
ACE_Asynch_Read_Dgram_Impl *	implementation_
	Implementation class that all methods will be forwarded to. More...

Private Member Functions
void	operator= (const ACE_Asynch_Read_Dgram &)
	ACE_Asynch_Read_Dgram (const ACE_Asynch_Read_Dgram &)

Additional Inherited Members
Protected Member Functions inherited from ACE_Asynch_Operation
	ACE_Asynch_Operation (void)
	Constructor. More...
ACE_Proactor *	get_proactor (ACE_Proactor *user_proactor, ACE_Handler &handler) const
	Get a proactor for/from the user. More...

Detailed Description

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

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

Constructor & Destructor Documentation

ACE_Asynch_Read_Dgram::ACE_Asynch_Read_Dgram

(

void

)

A do nothing constructor.

ACE_Asynch_Read_Dgram::~ACE_Asynch_Read_Dgram ( void  )

virtual

Destructor.

ACE_Asynch_Read_Dgram::ACE_Asynch_Read_Dgram ( const ACE_Asynch_Read_Dgram &  )

private

Member Function Documentation

ACE_Asynch_Operation_Impl * ACE_Asynch_Read_Dgram::implementation ( void  ) const

virtual

Return the underlying implementation class.

Implements ACE_Asynch_Operation.

int ACE_Asynch_Read_Dgram::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. If ({handle} == ACE_INVALID_HANDLE), {ACE_Handler::handle} will be called on the {handler} to get the correct handle.

void ACE_Asynch_Read_Dgram::operator= ( const ACE_Asynch_Read_Dgram &  )

private

ssize_t ACE_Asynch_Read_Dgram::recv	(	ACE_Message_Block *	message_block,
		size_t &	number_of_bytes_recvd,
		int	flags,
		int	protocol_family = PF_INET,
		const void *	act = 0,
		int	priority = 0,
		int	signal_number = ACE_SIGRTMIN
	)

This starts off an asynchronous read. Upto {message_block->total_size()} will be read and stored in the {message_block}. {message_block}'s {wr_ptr} will be updated to reflect the added bytes if the read operation is successfully completed. Return code of 1 means immediate success and {number_of_bytes_recvd} will contain number of bytes read. The {ACE_Handler::handle_read_dgram} method will still be called. Return code of 0 means the IO will complete proactively. Return code of -1 means there was an error, use errno to get the error code.

Scatter/gather is supported on WIN32 by using the {message_block->cont()} method. Up to ACE_IOV_MAX {message_block}'s are supported. Upto {message_block->size()} bytes will be read into each {message block} for a total of {message_block->total_size()} bytes. All {message_block}'s {wr_ptr}'s will be updated to reflect the added bytes for each {message_block}

Priority of the operation is specified by {priority}. 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. And so forth. On Win32, {priority} is a no-op. {signal_number} is the POSIX4 real-time signal number to be used for the operation. {signal_number} ranges from ACE_SIGRTMIN to ACE_SIGRTMAX. This argument is a no-op on non-POSIX4 systems.

Member Data Documentation

ACE_Asynch_Read_Dgram_Impl* ACE_Asynch_Read_Dgram::implementation_

protected

Implementation class that all methods will be forwarded to.

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

• Asynch_IO.h
• Asynch_IO.cpp