Proxy backend that mirrors writes to several internal backends. More...

Inheritance diagram for FileBackendMultiWrite:

Collaboration diagram for FileBackendMultiWrite:

Public Member Functions
	__construct (array $config)
	Construct a proxy backend that consists of several internal backends.
	accessibilityCheck (array $paths)
	Check that a set of file paths are usable across all internal backends.
	clearCache (array $paths=null)
	concatenate (array $params)
	consistencyCheck (array $paths)
	Check that a set of files are consistent across all internal backends.
	directoryExists (array $params)
	fileExists (array $params)
	getDirectoryList (array $params)
	getFileContentsMulti (array $params)
	getFileHttpUrl (array $params)
	getFileList (array $params)
	getFileProps (array $params)
	getFileSha1Base36 (array $params)
	getFileSize (array $params)
	getFileStat (array $params)
	getFileTimestamp (array $params)
	getLocalCopyMulti (array $params)
	getLocalReferenceMulti (array $params)
	getScopedLocksForOps (array $ops, Status $status)
	resyncFiles (array $paths)
	Check that a set of files are consistent across all internal backends and re-synchronize those files againt the "multi master" if needed.
	streamFile (array $params)
Public Attributes
const	CHECK_SHA1 = 4
const	CHECK_SIZE = 1
const	CHECK_TIME = 2
Protected Member Functions
	doClean (array $params)
	doOperationsInternal (array $ops, array $opts)
	doPrepare (array $params)
	doPublish (array $params)
	doQuickOperationsInternal (array $ops)
	doSecure (array $params)
	fileStoragePathsForOps (array $ops)
	Get a list of file storage paths to read or write for a list of operations.
	replicateContainerDirChanges ($path)
	substOpBatchPaths (array $ops, FileBackendStore $backend)
	Substitute the backend name in storage path parameters for a set of operations with that of a given internal backend.
	substOpPaths (array $ops, FileBackendStore $backend)
	Same as substOpBatchPaths() but for a single operation.
	substPaths ($paths, FileBackendStore $backend)
	Substitute the backend of storage paths with an internal backend's name.
	unsubstPaths ($paths)
	Substitute the backend of internal storage paths with the proxy backend's name.
Protected Attributes
	$autoResync = false
Array	$backends = array()
	Prioritized list of FileBackendStore objects *.
	$masterIndex = -1
Array	$noPushDirConts = array()
	*
	$noPushQuickOps = false
	$syncChecks = 0

Detailed Description

Proxy backend that mirrors writes to several internal backends.

This class defines a multi-write backend. Multiple backends can be registered to this proxy backend and it will act as a single backend. Use this when all access to those backends is through this proxy backend. At least one of the backends must be declared the "master" backend.

Only use this class when transitioning from one storage system to another.

Read operations are only done on the 'master' backend for consistency. Write operations are performed on all backends, in the order defined. If an operation fails on one backend it will be rolled back from the others.

Since:: 1.19

Definition at line 42 of file FileBackendMultiWrite.php.

Constructor & Destructor Documentation

FileBackendMultiWrite::__construct ( array $ config )

Construct a proxy backend that consists of several internal backends.

Locking, journaling, and read-only checks are handled by the proxy backend.

Additional $config params include:

backends : Array of backend config and multi-backend settings. Each value is the config used in the constructor of a FileBackendStore class, but with these additional settings:
- class : The name of the backend class
- isMultiMaster : This must be set for one backend.
- template: : If given a backend name, this will use the config of that backend as a template. Values specified here take precedence.
syncChecks : Integer bitfield of internal backend sync checks to perform. Possible bits include the FileBackendMultiWrite::CHECK_* constants. There are constants for SIZE, TIME, and SHA1. The checks are done before allowing any file operations.
autoResync : Automatically resync the clone backends to the master backend when pre-operation sync checks fail. This should only be used if the master backend is stable and not missing any files.
noPushQuickOps : (hack) Only apply doQuickOperations() to the master backend.
noPushDirConts : (hack) Only apply directory functions to the master backend.

Parameters:

$config Array

Exceptions:

MWException

Reimplemented from FileBackend.

Definition at line 82 of file FileBackendMultiWrite.php.

Member Function Documentation

FileBackendMultiWrite::accessibilityCheck ( array $ paths )

Check that a set of file paths are usable across all internal backends.

Parameters:

array $paths List of storage paths

Returns:: Status

Definition at line 274 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::clearCache ( array $ paths = null )

See also:: FileBackend::clearCache()

Reimplemented from FileBackend.

Definition at line 700 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::concatenate ( array $ params )

See also:: FileBackend::concatenate()

Parameters:

$params array

Returns:: Status

Reimplemented from FileBackend.

Definition at line 534 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::consistencyCheck ( array $ paths )

Check that a set of files are consistent across all internal backends.

Parameters:

array $paths List of storage paths

Returns:: Status

Definition at line 208 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::directoryExists ( array $ params )

See also:: FileBackend::directoryExists()

Parameters:

$params array

Returns:: bool|null

Reimplemented from FileBackend.

Definition at line 672 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::doClean ( array $ params ) [protected]

See also:: FileBackend::doClean()

Parameters:

$params array

Returns:: Status

Reimplemented from FileBackend.

Definition at line 517 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::doOperationsInternal	(	array $	ops,
		array $	opts
	)		`[final, protected]`

See also:: FileBackend::doOperationsInternal()

Returns:: Status

Reimplemented from FileBackend.

Definition at line 136 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::doPrepare ( array $ params ) [protected]

See also:: FileBackend::doPrepare()

Returns:: Status

Reimplemented from FileBackend.

Definition at line 466 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::doPublish ( array $ params ) [protected]

See also:: FileBackend::doPublish()

Parameters:

$params array

Returns:: Status

Reimplemented from FileBackend.

Definition at line 500 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::doQuickOperationsInternal ( array $ ops ) [protected]

See also:: FileBackend::doQuickOperationsInternal()

Returns:: Status

Reimplemented from FileBackend.

Definition at line 429 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::doSecure ( array $ params ) [protected]

See also:: FileBackend::doSecure()

Parameters:

$params array

Returns:: Status

Reimplemented from FileBackend.

Definition at line 483 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::fileExists ( array $ params )

See also:: FileBackend::fileExists()

Parameters:

$params array

Returns:: bool|null

Reimplemented from FileBackend.

Definition at line 545 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::fileStoragePathsForOps ( array $ ops ) [protected]

Get a list of file storage paths to read or write for a list of operations.

Parameters:

array $ops Same format as doOperations()

Returns:: Array List of storage paths to files (does not include directories)

Definition at line 340 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getDirectoryList ( array $ params )

See also:: FileBackend::getSubdirectoryList()

Parameters:

$params array

Returns:: Array|null|Traversable

Reimplemented from FileBackend.

Definition at line 682 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileContentsMulti ( array $ params )

See also:: FileBackend::getFileContentsMulti()

Parameters:

$params array

Returns:: bool|string

Reimplemented from FileBackend.

Definition at line 585 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileHttpUrl ( array $ params )

See also:: FileBackend::getFileHttpUrl()

Returns:: string|null

Reimplemented from FileBackend.

Definition at line 662 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileList ( array $ params )

See also:: FileBackend::getFileList()

Parameters:

$params array

Returns:: Array|null|

Reimplemented from FileBackend.

Definition at line 692 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileProps ( array $ params )

See also:: FileBackend::getFileProps()

Parameters:

$params array

Returns:: Array

Reimplemented from FileBackend.

Definition at line 611 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileSha1Base36 ( array $ params )

See also:: FileBackend::getFileSha1Base36()

Parameters:

$params array

Returns:: bool|string

Reimplemented from FileBackend.

Definition at line 601 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileSize ( array $ params )

See also:: FileBackend::getFileSize()

Parameters:

$params array

Returns:: bool|int

Reimplemented from FileBackend.

Definition at line 565 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileStat ( array $ params )

See also:: FileBackend::getFileStat()

Parameters:

$params array

Returns:: Array|bool|null

Reimplemented from FileBackend.

Definition at line 575 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getFileTimestamp ( array $ params )

See also:: FileBackend::getFileTimestamp()

Parameters:

$params array

Returns:: bool|string

Reimplemented from FileBackend.

Definition at line 555 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getLocalCopyMulti ( array $ params )

See also:: FileBackend::getLocalCopyMulti()

Parameters:

$params array

Returns:: null|TempFSFile

Reimplemented from FileBackend.

Definition at line 647 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getLocalReferenceMulti ( array $ params )

See also:: FileBackend::getLocalReferenceMulti()

Parameters:

$params array

Returns:: FSFile|null

Reimplemented from FileBackend.

Definition at line 631 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::getScopedLocksForOps	(	array $	ops,
		Status $	status
	)

See also:: FileBackend::getScopedLocksForOps()

Reimplemented from FileBackend.

Definition at line 710 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::replicateContainerDirChanges ( $ path ) [protected]

Parameters:

string $path Storage path

Returns:: bool Path container should have dir changes pushed to all backends

Definition at line 457 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::resyncFiles ( array $ paths )

Check that a set of files are consistent across all internal backends and re-synchronize those files againt the "multi master" if needed.

Parameters:

array $paths List of storage paths

Returns:: Status

Definition at line 299 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::streamFile ( array $ params )

See also:: FileBackend::streamFile()

Parameters:

$params array

Returns:

Reimplemented from FileBackend.

Definition at line 621 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::substOpBatchPaths	(	array $	ops,
		FileBackendStore $	backend
	)		`[protected]`

Substitute the backend name in storage path parameters for a set of operations with that of a given internal backend.

Parameters:

array	$ops	List of file operation arrays
	$backend	FileBackendStore

Returns:: Array

Definition at line 370 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::substOpPaths	(	array $	ops,
		FileBackendStore $	backend
	)		`[protected]`

Same as substOpBatchPaths() but for a single operation.

Parameters:

array	$ops	File operation array
	$backend	FileBackendStore

Returns:: Array

Definition at line 391 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::substPaths	(	$	paths,
		FileBackendStore $	backend
	)		`[protected]`

Substitute the backend of storage paths with an internal backend's name.

Parameters:

array \| string	$paths	List of paths or single string path
	$backend	FileBackendStore

Returns:: Array|string

Definition at line 403 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::unsubstPaths ( $ paths ) [protected]

Substitute the backend of internal storage paths with the proxy backend's name.

Parameters:

array | string $paths List of paths or single string path

Returns:: Array|string

Definition at line 417 of file FileBackendMultiWrite.php.

Member Data Documentation

FileBackendMultiWrite::$autoResync = false [protected]

Definition at line 46 of file FileBackendMultiWrite.php.

Array FileBackendMultiWrite::$backends = array() [protected]

Prioritized list of FileBackendStore objects *.

Definition at line 43 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::$masterIndex = -1 [protected]

Definition at line 44 of file FileBackendMultiWrite.php.

Array FileBackendMultiWrite::$noPushDirConts = array() [protected]

*

Definition at line 48 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::$noPushQuickOps = false [protected]

Definition at line 49 of file FileBackendMultiWrite.php.

FileBackendMultiWrite::$syncChecks = 0 [protected]

Definition at line 45 of file FileBackendMultiWrite.php.

const FileBackendMultiWrite::CHECK_SHA1 = 4

Definition at line 54 of file FileBackendMultiWrite.php.

const FileBackendMultiWrite::CHECK_SIZE = 1

Definition at line 52 of file FileBackendMultiWrite.php.

const FileBackendMultiWrite::CHECK_TIME = 2

Definition at line 53 of file FileBackendMultiWrite.php.

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

includes/filebackend/FileBackendMultiWrite.php

Public Member Functions

Public Attributes

Protected Member Functions

Protected Attributes

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation