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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:

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Collaboration diagram for ACE_Asynch_Read_Stream:

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List of all members.

Public Methods

 ACE_Asynch_Read_Stream (void)
 A do nothing constructor. More...

virtual ~ACE_Asynch_Read_Stream (void)
 Destructor. More...

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)
ACE_Asynch_Read_Stream_Implimplementation (void) const
 Return the underlying implementation class. More...


Protected Methods

void implementation (ACE_Asynch_Read_Stream_Impl *implementation)
 Set the implementation class. More...


Protected Attributes

ACE_Asynch_Read_Stream_Implimplementation_
 Implementation class that all methods will be forwarded to. More...


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.

Definition at line 256 of file Asynch_IO.h.


Constructor & Destructor Documentation

ACE_Asynch_Read_Stream::ACE_Asynch_Read_Stream void   
 

A do nothing constructor.

Definition at line 158 of file Asynch_IO.cpp.

00159   : implementation_ (0)
00160 {
00161 }

ACE_Asynch_Read_Stream::~ACE_Asynch_Read_Stream void    [virtual]
 

Destructor.

Definition at line 163 of file Asynch_IO.cpp.

00164 {
00165 }


Member Function Documentation

void ACE_Asynch_Read_Stream::implementation ACE_Asynch_Read_Stream_Impl   implementation [protected]
 

Set the implementation class.

Definition at line 232 of file Asynch_IO.cpp.

References ACE_Asynch_Operation::implementation, and implementation_.

00233 {
00234   this->implementation_ = implementation;
00235 
00236   // Init the base class' implementation also.
00237   ACE_Asynch_Operation::implementation (this->implementation_);
00238 }

ACE_Asynch_Read_Stream_Impl * ACE_Asynch_Read_Stream::implementation void    const
 

Return the underlying implementation class.

Reimplemented from ACE_Asynch_Operation.

Reimplemented in ACE_Asynch_Read_File.

Definition at line 226 of file Asynch_IO.cpp.

References implementation_.

Referenced by ACE_Asynch_Read_File::implementation, open, read, and ACE_Asynch_Read_Stream::Result::Result.

00227 {
00228   return implementation_;
00229 }

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.

Definition at line 168 of file Asynch_IO.cpp.

References ACE_Proactor::create_asynch_read_stream, ACE_Asynch_Operation::get_proactor, implementation, implementation_, and ACE_Asynch_Operation::open.

00172 {
00173   // Get a proactor for/from the user.
00174   proactor = this->get_proactor (proactor, handler);
00175 
00176   // Delete the old implementation.
00177   delete this->implementation_;
00178   this->implementation_ = 0;
00179 
00180   // Now let us get the implementation initialized.
00181   ACE_Asynch_Read_Stream_Impl *implementation = proactor->create_asynch_read_stream ();
00182   if (implementation == 0)
00183     return -1;
00184   
00185   // Set the implementation class
00186   this->implementation (implementation);
00187   
00188   // Call the <open> method of the base class. 
00189   return ACE_Asynch_Operation::open (handler,
00190                                      handle,
00191                                      completion_key,
00192                                      proactor);
00193 }

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.

Definition at line 196 of file Asynch_IO.cpp.

References implementation, and ACE_Asynch_Read_Stream_Impl::read.

00201 {
00202   return this->implementation ()->read (message_block,
00203                                         bytes_to_read,
00204                                         act,
00205                                         priority,
00206                                         signal_number);
00207 }


Member Data Documentation

ACE_Asynch_Read_Stream_Impl* ACE_Asynch_Read_Stream::implementation_ [protected]
 

Implementation class that all methods will be forwarded to.

Reimplemented from ACE_Asynch_Operation.

Reimplemented in ACE_Asynch_Read_File.

Definition at line 317 of file Asynch_IO.h.

Referenced by ACE_Asynch_Write_Stream::ACE_Asynch_Write_Stream, implementation, open, and ACE_Asynch_Read_Stream::Result::Result.


The documentation for this class was generated from the following files:
Generated on Mon Jun 16 12:45:27 2003 for ACE by doxygen1.2.14 written by Dimitri van Heesch, © 1997-2002