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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:

[legend]Collaboration diagram for ACE_Asynch_Read_Stream:

[legend]List of all members.

Public Methods
	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)
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.

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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.

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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. If (<handle> == ACE_INVALID_HANDLE), <ACE_Handler::handle> will be called on the <handler> to get the correct handle. Reimplemented from ACE_Asynch_Operation. Reimplemented in ACE_Asynch_Read_File.

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 )

This starts off an asynchronous read. Upto <bytes_to_read> 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 successful completed. 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.

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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

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