TAO_Notify::Random_File Class Reference

A random file class. More...

#include <Random_File.h>

Inheritance diagram for TAO_Notify::Random_File:

Collaboration diagram for TAO_Notify::Random_File:

List of all members.

Public Member Functions
	Random_File ()
	The constructor.
	~Random_File ()
	The destructor, which closes the open file.
bool	open (const ACE_TCHAR *filename, size_t block_size=512)
	Open a file with default permissions.
size_t	block_size () const
ACE_OFF_T	size () const
	Return the current file size, in number of blocks.
bool	write (const size_t block_number, void *buffer, bool atomic=false)
bool	read (const size_t block_number, void *buffer)
	Read a block from our file.
Private Member Functions
bool	seek (const size_t block_number)
	Seek to a given block number, used by reads and writes.
bool	sync ()
	Synchronize the file to disk, used to implement atomic.
Private Attributes
size_t	block_size_
TAO_SYNCH_MUTEX	lock_

---

Detailed Description

A random file class.

Derived from ACE_FILE, this class provides access to a file of fixed-size blocks.

---

Constructor & Destructor Documentation

TAO_Notify::Random_File::Random_File

(

)

The constructor.

TAO_Notify::Random_File::~Random_File

(

)

The destructor, which closes the open file.

---

Member Function Documentation

size_t TAO_Notify::Random_File::block_size

(

)

const

Accessor for the block size. Note signed size_t is used to be compatible with ACE_FILE.

bool TAO_Notify::Random_File::open	(	const ACE_TCHAR *	filename,
		size_t	block_size = 512
	)

Open a file with default permissions.

bool TAO_Notify::Random_File::read	(	const size_t	block_number,
		void *	buffer
	)

Read a block from our file.

bool TAO_Notify::Random_File::seek

(

const size_t

block_number )

[private]

Seek to a given block number, used by reads and writes.

ACE_OFF_T TAO_Notify::Random_File::size

(

)

const

Return the current file size, in number of blocks.

bool TAO_Notify::Random_File::sync

(

)

[private]

Synchronize the file to disk, used to implement atomic.

bool TAO_Notify::Random_File::write	(	const size_t	block_number,
		void *	buffer,
		bool	atomic = false
	)

Write a block to our file, potentially as an "atomic" write. If the atomic argument is true, then the operating system's write-through cache for this file is flushed both before and after the write. The flush before ensures that any record pointers in this block will point to records that actually appear in the file. The flush after provides the caller with a guarantee that the data will appear in the file even if the system fails immediately after this method returns.

---

Member Data Documentation

size_t TAO_Notify::Random_File::block_size_ [private]

TAO_SYNCH_MUTEX TAO_Notify::Random_File::lock_ [mutable, private]

---

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

• Random_File.h
• Random_File.cpp