A simple single-master LBFactory that gets its configuration from the b/c globals. More...

Inheritance diagram for Wikimedia\Rdbms\LBFactorySimple:

Collaboration diagram for Wikimedia\Rdbms\LBFactorySimple:

[legend]

Public Member Functions
	__construct (array $conf)

	forEachLB ( $callback, array $params=[])
	Execute a function for each currently tracked (instantiated) load balancer. More...

	getAllExternalLBs ()
	Get cached (tracked) load balancers for all external database clusters. More...

	getAllMainLBs ()
	Get cached (tracked) load balancers for all main database clusters. More...

	getExternalLB ( $cluster)
	Get a cached (tracked) load balancer for external storage. More...

	getMainLB ( $domain=false)
	Get a cached (tracked) load balancer object. More...

	newExternalLB ( $cluster, $owner=null)
	Create a new load balancer for external storage. More...

	newMainLB ( $domain=false, $owner=null)
	Create a new load balancer object. More...

Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
	__construct (array $conf)
	Construct a manager of ILoadBalancer objects. More...

	__destruct ()

	appendShutdownCPIndexAsQuery ( $url, $index)
	Append ?cpPosIndex parameter to a URL for ChronologyProtector purposes if needed. More...

	beginMasterChanges ( $fname=__METHOD__)
	Flush any master transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set) More...

	closeAll ()
	Close all open database connections on all open load balancers. More...

	commitAll ( $fname=__METHOD__, array $options=[])
	Commit open transactions on all connections. More...

	commitAndWaitForReplication ( $fname, $ticket, array $opts=[])
	Convenience method for safely running commitMasterChanges()/waitForReplication() More...

	commitMasterChanges ( $fname=__METHOD__, array $options=[])
	Commit changes and clear view snapshots on all master connections. More...

	destroy ()
	Disables all load balancers. More...

	disableChronologyProtection ()
	Disable the ChronologyProtector for all load balancers. More...

	flushReplicaSnapshots ( $fname=__METHOD__)
	Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshot. More...

	getChronologyProtectorClientId ()
	Get the client ID of the ChronologyProtector instance. More...

	getChronologyProtectorTouched ( $dbName)

	getEmptyTransactionTicket ( $fname)
	Get a token asserting that no transaction writes are active. More...

	getLocalDomainID ()
	Get the local (and default) database domain ID of connection handles. More...

	hasMasterChanges ()
	Determine if any master connection has pending changes. More...

	hasOrMadeRecentMasterChanges ( $age=null)
	Determine if any master connection has pending/written changes from this request. More...

	hasTransactionRound ()
	Check if an explicit transaction round is active. More...

	isReadyForRoundOperations ()
	Check if transaction rounds can be started, committed, or rolled back right now. More...

	laggedReplicaUsed ()
	Detemine if any lagged replica DB connection was used. More...

	redefineLocalDomain ( $domain)
	Close all connection and redefine the local domain for testing or schema creation. More...

	resolveDomainID ( $domain)

	rollbackMasterChanges ( $fname=__METHOD__)
	Rollback changes on all master connections. More...

	setAgentName ( $agent)

	setIndexAliases (array $aliases)
	Convert certain index names to alternative names before querying the DB. More...

	setLocalDomainPrefix ( $prefix)
	Set a new table prefix for the existing local domain ID for testing. More...

	setRequestInfo (array $info)

	setTableAliases (array $aliases)
	Make certain table names use their own database, schema, and table prefix when passed into SQL queries pre-escaped and without a qualified database name. More...

	setWaitForReplicationListener ( $name, callable $callback=null)
	Add a callback to be run in every call to waitForReplication() before waiting. More...

	shutdown ( $mode=self::SHUTDOWN_CHRONPROT_SYNC, callable $workCallback=null, &$cpIndex=null, &$cpClientId=null)
	Prepare all currently tracked (instantiated) load balancers for shutdown. More...

	waitForReplication (array $opts=[])
	Waits for the replica DBs to catch up to the current master position. More...

Private Member Functions
	newLoadBalancer (array $servers, $owner)

Private Attributes
LoadBalancer []	$externalLBs = []

array [][]	$externalServersByCluster = []
	Map of (cluster => server index => server config map) More...

string	$loadMonitorClass

LoadBalancer	$mainLB

array []	$mainServers = []
	Map of (server index => server config map) More...

Additional Inherited Members
Static Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
static	getCPInfoFromCookieValue ( $value, $minTimestamp)

static	makeCookieValueFromCPIndex ( $index, $time, $clientId)

Public Attributes inherited from Wikimedia\Rdbms\LBFactory
const	ROUND_BEGINNING = 'within-begin'

const	ROUND_COMMIT_CALLBACKS = 'within-commit-callbacks'

const	ROUND_COMMITTING = 'within-commit'

const	ROUND_CURSORY = 'cursory'

const	ROUND_ROLLBACK_CALLBACKS = 'within-rollback-callbacks'

const	ROUND_ROLLING_BACK = 'within-rollback'

Protected Member Functions inherited from Wikimedia\Rdbms\LBFactory
	baseLoadBalancerParams ( $owner)
	Get parameters to ILoadBalancer::__construct() More...

	forEachLBCallMethod ( $methodName, array $args=[])
	Call a method of each tracked load balancer. More...

	getChronologyProtector ()

	getOwnershipId ()

	initLoadBalancer (ILoadBalancer $lb)

	shutdownChronologyProtector (ChronologyProtector $cp, $workCallback, $mode, &$cpIndex=null)
	Get and record all of the staged DB positions into persistent memory storage. More...

Protected Attributes inherited from Wikimedia\Rdbms\LBFactory
DatabaseDomain	$localDomain
	Local domain. More...

int null	$maxLag

BagOStuff	$memStash

string bool	$readOnlyReason = false
	Reason all LBs are read-only or false if not. More...

BagOStuff	$srvCache

WANObjectCache	$wanCache

Detailed Description

A simple single-master LBFactory that gets its configuration from the b/c globals.

Definition at line 31 of file LBFactorySimple.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\LBFactorySimple::__construct ( array $conf )

See also: LBFactory::__construct()

Parameters

array

$conf

Additional parameters include:

servers : list of server config maps to Database::factory(). Additionally, the server maps should have a 'load' key, which is used to decide how often clients connect to one server verses the others. A 'max lag' key should also be set on server maps, indicating how stale the data can be before the load balancer tries to avoid using it. The map can have 'is static' set to disable blocking replication sync checks (intended for archive servers with unchanging data).
externalClusters : map of cluster names to server arrays. The servers arrays have the same format as "servers" above.

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 57 of file LBFactorySimple.php.

Member Function Documentation

◆ forEachLB()

Wikimedia\Rdbms\LBFactorySimple::forEachLB	(		$callback,
		array	$params = `[]`
	)

Execute a function for each currently tracked (instantiated) load balancer.

The callback is called with the load balancer as the first parameter, and $params passed as the subsequent parameters.

Parameters

callable	$callback
array	$params

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 123 of file LBFactorySimple.php.

◆ getAllExternalLBs()

Wikimedia\Rdbms\LBFactorySimple::getAllExternalLBs ( )

Get cached (tracked) load balancers for all external database clusters.

Returns: ILoadBalancer[] Map of (cluster name => ILoadBalancer)

Since: 1.29

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 101 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactorySimple\getExternalLB().

◆ getAllMainLBs()

Wikimedia\Rdbms\LBFactorySimple::getAllMainLBs ( )

Get cached (tracked) load balancers for all main database clusters.

The default cluster name is ILoadBalancer::CLUSTER_MAIN_DEFAULT

Returns: ILoadBalancer[] Map of (cluster name => ILoadBalancer)

Since: 1.29

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 97 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactorySimple\getMainLB().

◆ getExternalLB()

Wikimedia\Rdbms\LBFactorySimple::getExternalLB ( $cluster )

Get a cached (tracked) load balancer for external storage.

Parameters

string $cluster External storage cluster name

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 89 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactory\getOwnershipId(), and Wikimedia\Rdbms\LBFactorySimple\newExternalLB().

Referenced by Wikimedia\Rdbms\LBFactorySimple\getAllExternalLBs().

◆ getMainLB()

Wikimedia\Rdbms\LBFactorySimple::getMainLB ( $domain = false )

Get a cached (tracked) load balancer object.

Parameters

bool | string $domain Domain ID, or false for the current domain

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 73 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactorySimple\$mainLB, Wikimedia\Rdbms\LBFactory\getOwnershipId(), and Wikimedia\Rdbms\LBFactorySimple\newMainLB().

Referenced by Wikimedia\Rdbms\LBFactorySimple\getAllMainLBs().

◆ newExternalLB()

Wikimedia\Rdbms\LBFactorySimple::newExternalLB	(	$cluster,
		$owner = `null`
	)

Create a new load balancer for external storage.

The resulting object will be untracked, not chronology-protected, and the caller is responsible for cleaning it up.

This method is for only advanced usage and callers should almost always use getExternalLB() instead. This method can be useful when a table is used as a key/value store. In that cases, one might want to query it in autocommit mode (DBO_TRX off) but still use DBO_TRX transaction rounds on other tables.

Parameters

string	$cluster	External storage cluster name
int \| null	$owner	Owner ID of the new instance (e.g. this LBFactory ID)

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 81 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactorySimple\newLoadBalancer().

Referenced by Wikimedia\Rdbms\LBFactorySimple\getExternalLB().

◆ newLoadBalancer()

Wikimedia\Rdbms\LBFactorySimple::newLoadBalancer	(	array	$servers,
			$owner
	)

private

Definition at line 110 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactory\baseLoadBalancerParams(), and Wikimedia\Rdbms\LBFactory\initLoadBalancer().

Referenced by Wikimedia\Rdbms\LBFactorySimple\newExternalLB(), and Wikimedia\Rdbms\LBFactorySimple\newMainLB().

◆ newMainLB()

Wikimedia\Rdbms\LBFactorySimple::newMainLB	(	$domain = `false`,
		$owner = `null`
	)

Create a new load balancer object.

The resulting object will be untracked, not chronology-protected, and the caller is responsible for cleaning it up.

This method is for only advanced usage and callers should almost always use getMainLB() instead. This method can be useful when a table is used as a key/value store. In that cases, one might want to query it in autocommit mode (DBO_TRX off) but still use DBO_TRX transaction rounds on other tables.

Parameters

bool \| string	$domain	Domain ID, or false for the current domain
int \| null	$owner	Owner ID of the new instance (e.g. this LBFactory ID)

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 69 of file LBFactorySimple.php.

References Wikimedia\Rdbms\LBFactorySimple\newLoadBalancer().

Referenced by Wikimedia\Rdbms\LBFactorySimple\getMainLB().

Member Data Documentation

◆ $externalLBs

LoadBalancer [] Wikimedia\Rdbms\LBFactorySimple::$externalLBs = []

private

Definition at line 35 of file LBFactorySimple.php.

◆ $externalServersByCluster

array [][] Wikimedia\Rdbms\LBFactorySimple::$externalServersByCluster = []

private

Map of (cluster => server index => server config map)

Definition at line 40 of file LBFactorySimple.php.

◆ $loadMonitorClass

string Wikimedia\Rdbms\LBFactorySimple::$loadMonitorClass

private

Definition at line 43 of file LBFactorySimple.php.

◆ $mainLB

LoadBalancer Wikimedia\Rdbms\LBFactorySimple::$mainLB

private

Definition at line 33 of file LBFactorySimple.php.

Referenced by Wikimedia\Rdbms\LBFactorySimple\getMainLB().

◆ $mainServers

array [] Wikimedia\Rdbms\LBFactorySimple::$mainServers = []

private

Map of (server index => server config map)

Definition at line 38 of file LBFactorySimple.php.

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

includes/libs/rdbms/lbfactory/LBFactorySimple.php

Public Member Functions

Private Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ forEachLB()

◆ getAllExternalLBs()

◆ getAllMainLBs()

◆ getExternalLB()

◆ getMainLB()

◆ newExternalLB()

◆ newLoadBalancer()

◆ newMainLB()

Member Data Documentation

◆ $externalLBs

◆ $externalServersByCluster

◆ $loadMonitorClass

◆ $mainLB

◆ $mainServers