VFS_datastore_cache Class Reference

A subclass of QCache and QObject. More...

#include <VFS_datastore.h>

Inheritance diagram for VFS_datastore_cache:

Public Member Functions
	VFS_datastore_cache (quint64 size)
virtual	~VFS_datastore_cache ()
bool	insert (const QString &key, VFS_datastore_cache_entry *object)
	Insert a new entry. More...

Static Public Attributes
static const quint64	DEFAULT_DATACACHE_SIZE = 104857600
	The default size to create a cache. Defaults to 100mb. More...

Private Slots
void	expired (VFS_datastore_cache_entry *)
	A cache entry has exipred. More...
void	touched ()
	A cache entry has been touched. More...

Detailed Description

A subclass of QCache and QObject.

The QCache uses QString as a key, and will track VFS_datastore_cache_entry objects.

If the contents of the cache exceed the allowed size, oldest entries will be flushed and removed. Entries will have an expiration and if unmodified, will be flushed and removed from the cache.

Note

Because this is a class with double inheritance, it may be revisited and changed in the future.

See also

VFS_datastore_cache_entry

Definition at line 60 of file VFS_datastore.h.

Constructor & Destructor Documentation

VFS_datastore_cache()

VFS_datastore_cache::VFS_datastore_cache ( quint64  size )

explicit

Parameters

size	The initial size of the cache, in bytes.

Definition at line 241 of file VFS_datastore.cpp.

~VFS_datastore_cache()

VFS_datastore_cache::~VFS_datastore_cache ( )

virtual

Definition at line 246 of file VFS_datastore.cpp.

Member Function Documentation

expired

void VFS_datastore_cache::expired ( VFS_datastore_cache_entry *  e )

privateslot

A cache entry has exipred.

Remove it.

Parameters

e	The cache entry

If the entry was not found, write a warning to the log.

Definition at line 317 of file VFS_datastore.cpp.

insert()

bool VFS_datastore_cache::insert	(	const QString &	key,
		VFS_datastore_cache_entry *	object
	)

Insert a new entry.

Parameters

key	Entry key
object	Entry object

Returns

Success or failure of insertion

This will also connect the expired() signal, allowing the cache to maintain expiration features.

If the insertion is unsuccessful, the result is undefined. The object is not deleted, but the owning VFS_node will need to decide what to do.

Definition at line 289 of file VFS_datastore.cpp.

touched

void VFS_datastore_cache::touched ( )

privateslot

A cache entry has been touched.

Make sure the cache knows.

This will use the object() method to refresh the entry's access time.

Definition at line 334 of file VFS_datastore.cpp.

Member Data Documentation

DEFAULT_DATACACHE_SIZE

const quint64 VFS_datastore_cache::DEFAULT_DATACACHE_SIZE = 104857600

static

The default size to create a cache. Defaults to 100mb.

Definition at line 74 of file VFS_datastore.h.

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

• VFS_datastore.h
• VFS_datastore.cpp