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

Inheritance diagram for Wikimedia\Rdbms\LBFactorySimple:

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Collaboration diagram for Wikimedia\Rdbms\LBFactorySimple:

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Public Member Functions
	__construct (array $conf)

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

	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 a main cluster.

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

	newMainLB ( $domain=false, $owner=null)
	Create a new load balancer instance for a main cluster.

Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
	__destruct ()

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

	beginMasterChanges ( $fname=__METHOD__)

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

	closeAll ()
	Close all connections on instantiated tracked load balancer instances.

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

	commitAndWaitForReplication ( $fname, $ticket, array $opts=[])
	Call commitPrimaryChanges() and waitForReplication() if $ticket indicates it is safe.

	commitMasterChanges ( $fname=__METHOD__, array $options=[])

	commitPrimaryChanges ( $fname=__METHOD__, array $options=[])
	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.

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

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

	getChronologyProtectorTouched ( $domain=false)
	Get the UNIX timestamp when the client last touched the DB, if they did so recently.

	getEmptyTransactionTicket ( $fname)
	Get a token asserting that no transaction writes are active on tracked load balancers.

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

	getTransactionProfiler ()
	Get the TransactionProfiler used by this instance.

	hasMasterChanges ()

	hasOrMadeRecentMasterChanges ( $age=null)

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

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

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

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

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

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

	resolveDomainID ( $domain)

	rollbackMasterChanges ( $fname=__METHOD__)

	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.

	setMockTime (&$time)

	setRequestInfo (array $info)
	Inject HTTP request header/cookie information during setup of this instance.

	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() before 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 DBs to catch up to the current primary position.

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

Private Attributes
LoadBalancer[]	$externalLBs = []

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

array	$loadMonitorConfig
	Configuration for the LoadMonitor to use within LoadBalancer instances.

LoadBalancer	$mainLB

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

Additional Inherited Members
Static Public Member Functions inherited from Wikimedia\Rdbms\LBFactory
static	getCPInfoFromCookieValue (?string $value, int $minTimestamp)
	Parse a string conveying the client and write index of the chronology protector data.

static	makeCookieValueFromCPIndex (int $writeIndex, int $time, string $clientId)
	Build a string conveying the client and write index of the chronology protector data.

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

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

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

	forEachLBCallMethod ( $methodName, array $args=[])
	Call a method on each tracked (instantiated) load balancer instance.

	getChronologyProtector ()

	getOwnershipId ()

	initLoadBalancer (ILoadBalancer $lb)

	resolveDomainInstance ( $domain)

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

Protected Attributes inherited from Wikimedia\Rdbms\LBFactory
BagOStuff	$cpStash

DatabaseDomain	$localDomain
	Local domain.

int null	$maxLag

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

BagOStuff	$srvCache

WANObjectCache	$wanCache

Detailed Description

A simple single-primary DB 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.
loadMonitor: LoadMonitor::__construct() parameters with "class" field. [optional]

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 58 of file LBFactorySimple.php.

Member Function Documentation

◆ forEachLB()

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

Execute a function for each instantiated tracked load balancer instance.

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 143 of file LBFactorySimple.php.

◆ getAllExternalLBs()

Wikimedia\Rdbms\LBFactorySimple::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 120 of file LBFactorySimple.php.

◆ getAllMainLBs()

Wikimedia\Rdbms\LBFactorySimple::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 116 of file LBFactorySimple.php.

◆ getExternalLB()

Wikimedia\Rdbms\LBFactorySimple::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

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 105 of file LBFactorySimple.php.

◆ getMainLB()

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

Get the tracked load balancer instance for a main cluster.

If no tracked instances exists, then one will be instantiated

Parameters

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

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 85 of file LBFactorySimple.php.

◆ newExternalLB()

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

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
int \| null	$owner	Owner ID of the new instance (e.g. this LBFactory ID)

Returns: ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 93 of file LBFactorySimple.php.

◆ newLoadBalancer()

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

private

Definition at line 129 of file LBFactorySimple.php.

◆ newMainLB()

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

Create a new load balancer instance for a main 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 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 77 of file LBFactorySimple.php.

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 43 of file LBFactorySimple.php.

◆ $loadMonitorConfig

array Wikimedia\Rdbms\LBFactorySimple::$loadMonitorConfig

private

Configuration for the LoadMonitor to use within LoadBalancer instances.

Definition at line 38 of file LBFactorySimple.php.

◆ $mainLB

LoadBalancer Wikimedia\Rdbms\LBFactorySimple::$mainLB

private

Definition at line 33 of file LBFactorySimple.php.

◆ $mainServers

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

private

Map of (server index => server config map)

Definition at line 41 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

◆ $loadMonitorConfig

◆ $mainLB

◆ $mainServers