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# ACE_Filecache_Handle Class Reference

Abstraction over a real file. This is meant to be the entry point into the Cached Virtual Filesystem. More...

`#include <Filecache.h>`

Collaboration diagram for ACE_Filecache_Handle:

[legend]
List of all members.

## Public Types
enum | { ACE_SUCCESS = 0, ACE_ACCESS_FAILED, ACE_OPEN_FAILED, ACE_COPY_FAILED, ACE_STAT_FAILED, ACE_MEMMAP_FAILED, ACE_WRITE_FAILED }
| These come from ACE_Filecache_Object, which is an internal class. More...
## Public Methods
| ACE_Filecache_Handle (const ACE_TCHAR *filename, ACE_Filecache_Flag mapit=ACE_MAPIT)
| Query cache for file, and acquire it. Assumes the file is being opened for reading. More...
| ACE_Filecache_Handle (const ACE_TCHAR *filename, int size, ACE_Filecache_Flag mapit=ACE_MAPIT)
| ~ACE_Filecache_Handle (void)
| Closes any open handles, release acquired file. More...
void * | address (void) const
| Base address of memory mapped file. More...
ACE_HANDLE | handle (void) const
| A handle (e.g., UNIX file descriptor, or NT file handle). More...
int | error (void) const
| Any associated error in handle creation and acquisition. More...
off_t | size (void) const
| The size of the file. More...
## Protected Methods
| ACE_Filecache_Handle (void)
| Default do nothing constructor. Prevent it from being called. More...
void | init (void)
| Common initializations for constructors. More...
## Private Attributes
ACE_Filecache_Object * | file_
| A reference to the low level instance. More...
ACE_HANDLE | handle_
| A <dup>'d version of the one from <file_>. More...
int | mapit_

## Detailed Description

Abstraction over a real file. This is meant to be the entry point into the Cached Virtual Filesystem.

This is a cached filesystem implementation based loosely on the implementation of JAWS_File. The interfaces will be nearly the same. The under-the-hood implementation should hopefully be a much faster thing. These will be given their own implementations later. For now, we borrow the implementation provided by JAWS. On creation, the cache is checked, and reference count is incremented. On destruction, reference count is decremented. If the reference count is 0, the file is removed from the cache. E.g. 1, { ACE_Filecache_Handle foo("foo.html"); this->peer ().send (foo.address (), foo.size ()); } E.g. 2, { ACE_Filecache_Handle foo("foo.html"); io->transmitfile (foo.handle (), this->peer ().handle ()); } E.g. 3, { ACE_Filecache_Handle foo("foo.html", content_length); this->peer ().recv (foo.address (), content_length); } TODO:

## Member Enumeration Documentation

anonymous enum

  | These come from ACE_Filecache_Object, which is an internal class. Enumeration values:
  ACE_SUCCESS |
  ACE_ACCESS_FAILED |
  ACE_OPEN_FAILED |
  ACE_COPY_FAILED |
  ACE_STAT_FAILED |
  ACE_MEMMAP_FAILED |
  ACE_WRITE_FAILED |

## Constructor & Destructor Documentation

ACE_Filecache_Handle::ACE_Filecache_Handle | ( | const ACE_TCHAR * | filename,
|  | ACE_Filecache_Flag | mapit = ACE_MAPIT
| ) |

| Query cache for file, and acquire it. Assumes the file is being opened for reading.

ACE_Filecache_Handle::ACE_Filecache_Handle | ( | const ACE_TCHAR * | filename,
|  | int | size,
|  | ACE_Filecache_Flag | mapit = ACE_MAPIT
| ) |

| Create new entry, and acquire it. Presence of SIZE assumes the file is being opened for writing. If SIZE is zero, assumes the file is to be removed from the cache.

ACE_Filecache_Handle::~ACE_Filecache_Handle | ( | void |  | ) |

| Closes any open handles, release acquired file.

ACE_Filecache_Handle::ACE_Filecache_Handle | ( | void |  | ) | `[protected]`

| Default do nothing constructor. Prevent it from being called.

## Member Function Documentation

void * ACE_Filecache_Handle::address | ( | void |  | ) | const

| Base address of memory mapped file.

int ACE_Filecache_Handle::error | ( | void |  | ) | const

| Any associated error in handle creation and acquisition.

ACE_HANDLE ACE_Filecache_Handle::handle | ( | void |  | ) | const

| A handle (e.g., UNIX file descriptor, or NT file handle).

void ACE_Filecache_Handle::init | ( | void |  | ) | `[protected]`

| Common initializations for constructors.

off_t ACE_Filecache_Handle::size | ( | void |  | ) | const

| The size of the file.

## Member Data Documentation

ACE_Filecache_Object* ACE_Filecache_Handle::file_`[private]`

| A reference to the low level instance.

ACE_HANDLE ACE_Filecache_Handle::handle_`[private]`

| A <dup>'d version of the one from <file_>.

int ACE_Filecache_Handle::mapit_`[private]`

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

- Filecache.h
- Filecache.cpp