LoadBalancer manager for sites with one "main" cluster using only injected database connections. More...

Collaboration diagram for Wikimedia\Rdbms\LBFactorySingle:

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Public Member Functions
	__construct (array $conf)

	__destruct ()

	getAllExternalLBs ()
	Get the tracked load balancer instances for all external clusters.

	getAllMainLBs ()
	Get the tracked load balancer instances for all main clusters.

	getExternalLB ( $cluster)
	Get the tracked load balancer instance for an external cluster.

	getMainLB ( $domain=false)
	Get the tracked load balancer instance for the main cluster that handles the given domain.

	newExternalLB ( $cluster)
	Create a new load balancer instance for an external cluster.

	newMainLB ( $domain=false)
	Create a new load balancer instance for the main cluster that handles the given domain.

Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
	autoReconfigure ()
	Reload config using the callback passed defined $config['configCallback'].

	beginPrimaryChanges ( $fname=__METHOD__)
	Flush any primary transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set)

	closeAll ( $fname=__METHOD__)
	Close all connections on instantiated tracked load balancer instances.

	commitAndWaitForReplication ( $fname, $ticket, array $opts=[])
	Commit primary DB transactions and wait for replication (if $ticket indicates it is safe).

	commitPrimaryChanges ( $fname=__METHOD__, int $maxWriteDuration=0)
	Commit changes and clear view snapshots on all primary connections.

	destroy ()
	Close all connections and make further attempts to open connections result in DBAccessError.

	disableChronologyProtection ()
	Disable the ChronologyProtector on all instantiated tracked load balancer instances.

	flushPrimarySessions ( $fname=__METHOD__)
	Release important session-level state (named lock, table locks) as post-rollback cleanup.

	flushReplicaSnapshots ( $fname=__METHOD__)
	Commit all replica database server transactions, clearing any REPEATABLE-READ/SSI snapshots.

	getAllLBs ()
	Get all tracked load balancer instances (generator)

	getEmptyTransactionTicket ( $fname)
	Get a token asserting that no write transactions are active on tracked connections.

	getLoadBalancer ( $domain=false)
	Get the tracked load balancer instance for a given domain.

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

	getPrimaryDatabase ( $domain=false)
	Get connection to the primary database.

	getReplicaDatabase ( $domain=false, $group=null)
	Get connection to a replica database.

	getTransactionProfiler ()
	Get the TransactionProfiler used by this instance.

	hasOrMadeRecentPrimaryChanges ( $age=null)
	Determine if any primary connection has pending/written changes from this request.

	hasPrimaryChanges ()
	Determine if any primary connection has pending changes.

	hasStreamingReplicaServers ()
	Whether it has streaming replica servers.

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

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

	laggedReplicaUsed ()
	Determine if any lagged replica database server connection was used.

	reconfigure (array $conf)
	Reconfigure using the given config array.

	redefineLocalDomain ( $domain)
	Close all connections and redefine the local database domain.

	rollbackPrimaryChanges ( $fname=__METHOD__)
	Rollback changes on all primary connections.

	setAgentName ( $agent)

	setDefaultReplicationWaitTimeout ( $seconds)
	Set the default timeout for replication wait checks.

	setDomainAliases (array $aliases)
	Convert certain database domains to alternative ones.

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

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

	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.

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

	shutdown ( $flags=self::SHUTDOWN_NORMAL, callable $workCallback=null, &$cpIndex=null, &$cpClientId=null)
	Prepare all instantiated tracked load balancer instances for shutdown.

	waitForReplication (array $opts=[])
	Waits for the replica database server to catch up to the current primary position.

Static Public Member Functions
static	newDisabled (array $params=[])

static	newFromConnection (IDatabase $db, array $params=[])

Protected Member Functions
	getLBsForOwner ()
	Get all tracked load balancers with the internal "for owner" interface.

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

	configure (array $conf)

	initLoadBalancer (ILoadBalancerForOwner $lb)

Additional Inherited Members
Public Attributes inherited from Wikimedia\Rdbms\ILBFactory
const	SHUTDOWN_NO_CHRONPROT = 1
	Do not save "session consistency" DB replication positions.

const	SHUTDOWN_NORMAL = 0
	Idiom for "no special shutdown flags".

Protected Attributes inherited from Wikimedia\Rdbms\LBFactory
ChronologyProtector	$chronologyProtector

DatabaseDomain[] string[]	$domainAliases = []
	Map of (domain alias => DB domain)

DatabaseDomain	$localDomain
	Local domain.

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

BagOStuff	$srvCache

array string[]	$virtualDomains = []
	List of registered virtual domains.

array array[]	$virtualDomainsMapping = []
	Map of virtual domain to array of cluster and domain.

WANObjectCache	$wanCache

Detailed Description

LoadBalancer manager for sites with one "main" cluster using only injected database connections.

This class assumes that there are no "external" clusters.

LoadBalancerDisabled will be used if a null connection handle is injected.

See also: ILBFactory

Definition at line 35 of file LBFactorySingle.php.

Constructor & Destructor Documentation

◆ __construct()

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

Note: Use of newFromConnection is preferable

Parameters

array

$conf

An associative array containing one of the following:

connection: The IDatabase connection handle to use; null to disable access

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 45 of file LBFactorySingle.php.

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

◆ __destruct()

Wikimedia\Rdbms\LBFactorySingle::__destruct ( )

Definition at line 125 of file LBFactorySingle.php.

Member Function Documentation

◆ getAllExternalLBs()

Wikimedia\Rdbms\LBFactorySingle::getAllExternalLBs ( )

Get the tracked load balancer instances for all external clusters.

If no tracked instance exists for a cluster, then one will be instantiated

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

Since: 1.29

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 115 of file LBFactorySingle.php.

◆ getAllMainLBs()

Wikimedia\Rdbms\LBFactorySingle::getAllMainLBs ( )

Get the tracked load balancer instances for all main clusters.

If no tracked instance exists for a cluster, then one will be instantiated

Note that default main cluster name is ILoadBalancer::CLUSTER_MAIN_DEFAULT

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

Since: 1.29

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 111 of file LBFactorySingle.php.

◆ getExternalLB()

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

Get the tracked load balancer instance for an external cluster.

If no tracked instances exists, then one will be instantiated

Parameters

string $cluster External cluster name

Exceptions

InvalidArgumentException If $cluster is not recognized

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 106 of file LBFactorySingle.php.

◆ getLBsForOwner()

Wikimedia\Rdbms\LBFactorySingle::getLBsForOwner ( )

protected

Get all tracked load balancers with the internal "for owner" interface.

Returns: Generator|ILoadBalancerForOwner[]

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 119 of file LBFactorySingle.php.

◆ getMainLB()

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

Get the tracked load balancer instance for the main cluster that handles the given domain.

If no tracked instances exists, then one will be instantiated

Note: The local/default database domain used by the load balancer instance will still inherit from this ILBFactory instance, regardless of the $domain parameter.

Parameters

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

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 97 of file LBFactorySingle.php.

◆ newDisabled()

static Wikimedia\Rdbms\LBFactorySingle::newDisabled ( array $params = [] )

static

Parameters

array $params Parameter map to LBFactorySingle::__construct()

Returns: LBFactorySingle

Since: 1.40

Definition at line 85 of file LBFactorySingle.php.

References $params.

◆ newExternalLB()

Wikimedia\Rdbms\LBFactorySingle::newExternalLB ( $cluster )

Create a new load balancer instance for an external cluster.

The resulting object will be untracked and the caller is responsible for cleaning it up. Database replication positions will not be saved by ChronologyProtector.

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 cluster name

Exceptions

InvalidArgumentException If $cluster is not recognized

Returns: ILoadBalancerForOwner

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 101 of file LBFactorySingle.php.

◆ newFromConnection()

static Wikimedia\Rdbms\LBFactorySingle::newFromConnection	(	IDatabase	$db,
		array	$params = [] )

static

Parameters

IDatabase	$db	Live connection handle
array	$params	Parameter map to LBFactorySingle::__construct()

Returns: LBFactorySingle

Since: 1.28

Definition at line 72 of file LBFactorySingle.php.

References $params, and Wikimedia\Rdbms\IReadableDatabase\getDomainID().

◆ newMainLB()

Wikimedia\Rdbms\LBFactorySingle::newMainLB ( $domain = false )

Create a new load balancer instance for the main cluster that handles the given domain.

The resulting object is considered to be owned by the caller. Namely, it will be untracked, the caller is responsible for cleaning it up, and replication positions from it will not be saved by ChronologyProtector.

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.

Note: The local/default database domain used by the load balancer instance will still inherit from this ILBFactory instance, regardless of the $domain parameter.

Parameters

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

Returns: ILoadBalancerForOwner

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 92 of file LBFactorySingle.php.

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

includes/libs/rdbms/lbfactory/LBFactorySingle.php

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

◆ __destruct()

Member Function Documentation

◆ getAllExternalLBs()

◆ getAllMainLBs()

◆ getExternalLB()

◆ getLBsForOwner()

◆ getMainLB()

◆ newDisabled()

◆ newExternalLB()

◆ newFromConnection()

◆ newMainLB()