Trivial LoadBalancer that always fails. More...

Collaboration diagram for Wikimedia\Rdbms\LoadBalancerDisabled:

[legend]

Public Member Functions
	__construct ( $params=[])

	getConnection ( $i, $groups=[], $domain=false, $flags=0)

	getConnectionInternal ( $i, $groups=[], $domain=false, $flags=0)

	getConnectionRef ( $i, $groups=[], $domain=false, $flags=0)

	getMaintenanceConnectionRef ( $i, $groups=[], $domain=false, $flags=0)

	reuseConnection (IDatabase $conn)

Public Member Functions inherited from Wikimedia\Rdbms\LoadBalancer
	__construct (array $params)

	approvePrimaryChanges (int $maxWriteDuration, $fname=__METHOD__)
	Perform all pre-commit checks for things like replication safety.

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

	closeAll ( $fname=__METHOD__)
	Close all open connections.

	closeConnection (IDatabase $conn)
	Close a connection.

	commitPrimaryChanges ( $fname=__METHOD__)
	Issue COMMIT on all open primary connections to flush changes and view snapshots.

	disable ( $fname=__METHOD__)
	Close all connections and disable this load balancer.

	explicitTrxActive ()
	Determine whether an explicit transaction is active on any open primary connection.

	finalizePrimaryChanges ( $fname=__METHOD__)
	Run pre-commit callbacks and defer execution of post-commit callbacks.

	flushPrimarySessions ( $fname=__METHOD__)
	Release/destroy session-level named locks, table locks, and temp tables.

	flushPrimarySnapshots ( $fname=__METHOD__)
	Commit all primary DB transactions so as to flush any REPEATABLE-READ or SSI snapshots.

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

	getAnyOpenConnection ( $i, $flags=0)
	Get an existing DB handle to the given server index (on any domain)

	getClusterName ()
	Get the name of the overall cluster of database servers managing the dataset.

	getLagTimes ()
	Get an estimate of replication lag (in seconds) for each server.

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

	getMaxLag ()
	Get the name and lag time of the most-lagged replica server.

	getPrimaryPos ()
	Get the current primary replication position.

	getReaderIndex ( $group=false)
	Get the specific server index of the reader connection for a given group.

	getReadOnlyReason ( $domain=false)

	getReplicaResumePos ()
	Get the highest DB replication position for chronology control purposes.

	getServerAttributes ( $i)
	Get basic attributes of the server with the specified index without connecting.

	getServerConnection ( $i, $domain, $flags=0)
	Get a DB handle for a specific server index.

	getServerCount ()
	Get the number of servers defined in configuration.

	getServerInfo ( $i)
	Return the server configuration map for the server with the specified index.

	getServerName ( $i)
	Get the readable name of the server with the specified index.

	getServerType ( $i)
	Get the RDBMS type of the server with the specified index (e.g.

	getWriterIndex ()
	Get the specific server index of the "writer server".

	hasOrMadeRecentPrimaryChanges ( $age=null)
	Check if this load balancer object had any recent or still pending writes issued against it by this PHP thread.

	hasPrimaryChanges ()
	Whether there are pending changes or callbacks in a transaction by this thread.

	hasPrimaryConnection ()

	hasReplicaServers ()
	Whether there are any replica servers configured.

	hasStreamingReplicaServers ()
	Whether any replica servers use streaming replication from the primary server.

	laggedReplicaUsed ()
	Whether a highly "lagged" replica database connection was queried.

	lastPrimaryChangeTimestamp ()
	Get the timestamp of the latest write query done by this thread.

	pendingPrimaryChangeCallers ()
	Get the list of callers that have pending primary changes.

	pingAll ()

	reconfigure (array $params)
	Apply updated configuration.

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

	resolveDomainID ( $domain)

	rollbackPrimaryChanges ( $fname=__METHOD__)
	Issue ROLLBACK only on primary, only if queries were done on connection.

	runPrimaryTransactionIdleCallbacks ( $fname=__METHOD__)
	Consume and run all pending post-COMMIT/ROLLBACK callbacks and commit dangling transactions.

	runPrimaryTransactionListenerCallbacks ( $fname=__METHOD__)
	Run all recurring post-COMMIT/ROLLBACK listener callbacks.

	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.

	setTempTablesOnlyMode ( $value, $domain)
	Indicate whether the tables on this domain are only temporary tables for testing.

	setTransactionListener ( $name, callable $callback=null)
	Set a callback via IDatabase::setTransactionListener() on all current and future primary connections of this load balancer.

	waitFor (DBPrimaryPos $pos)
	Set the primary position to reach before the next generic group DB query.

	waitForAll (DBPrimaryPos $pos, $timeout=null)
	Set the primary wait position and wait for ALL replica DBs to catch up to it.

	waitForPrimaryPos (IDatabase $conn)
	Wait for a replica DB to reach a specified primary position.

Protected Member Functions
	reallyOpenConnection ( $i, DatabaseDomain $domain, array $lbInfo)

Protected Member Functions inherited from Wikimedia\Rdbms\LoadBalancer
	configure (array $params)

	getConnLogContext (IDatabase $conn, array $extras=[])
	Create a log context to pass to PSR-3 logger functions.

	getExistingReaderIndex ( $group)
	Get the server index chosen for DB_REPLICA connections for the given query group.

	resolveDomainInstance ( $domain)

Additional Inherited Members
Public Attributes inherited from Wikimedia\Rdbms\LoadBalancer
const	MAX_LAG_DEFAULT = ServerInfo::MAX_LAG_DEFAULT
	Default 'maxLag' when unspecified.

Public Attributes inherited from Wikimedia\Rdbms\ILoadBalancerForOwner
const	STAGE_POSTCOMMIT_CALLBACKS = 'stage-postcommit-callbacks'
	Manager of ILoadBalancer instances is running post-commit callbacks.

const	STAGE_POSTROLLBACK_CALLBACKS = 'stage-postrollback-callbacks'
	Manager of ILoadBalancer instances is running post-rollback callbacks.

Public Attributes inherited from Wikimedia\Rdbms\ILoadBalancer
const	CONN_INTENT_WRITABLE = 8
	Caller is requesting the primary DB server for possibly writes.

const	CONN_REFRESH_READ_ONLY = 16
	Bypass and update any server-side read-only mode state cache.

const	CONN_SILENCE_ERRORS = 4
	Yield null on connection failure instead of throwing an exception.

const	CONN_TRX_AUTOCOMMIT = 2
	Yield a tracked autocommit-mode handle (reuse existing ones)

const	CONN_UNTRACKED_GAUGE = 1
	Yield an untracked, low-timeout, autocommit-mode handle (to gauge server health)

const	DB_MASTER = self::DB_PRIMARY
	Request a primary, write-enabled DB connection.

const	DB_PRIMARY = -2
	Request a primary, write-enabled DB connection.

const	DB_REPLICA = -1
	Request a replica DB connection.

const	DOMAIN_ANY = ''
	Domain specifier when no specific database needs to be selected.

const	GROUP_GENERIC = ''
	The generic query group.

Detailed Description

Trivial LoadBalancer that always fails.

Useful when running code with no config file present, e.g. during the installation process.

Since: 1.40

Definition at line 33 of file LoadBalancerDisabled.php.

Constructor & Destructor Documentation

◆ __construct()

Wikimedia\Rdbms\LoadBalancerDisabled::__construct ( $params = [] )

Definition at line 35 of file LoadBalancerDisabled.php.

Member Function Documentation

◆ getConnection()

Wikimedia\Rdbms\LoadBalancerDisabled::getConnection	(	$i,
		$groups = [],
		$domain = false,
		$flags = 0 )

Parameters

int	$i	Specific (overrides $groups) or virtual (DB_PRIMARY/DB_REPLICA) server index
string[] \| string	$groups	Query group(s) in preference order; [] for the default group
string \| false	$domain	DB domain ID or false for the local domain
int	$flags	Bitfield of CONN_* class constants

Returns: never

Reimplemented from Wikimedia\Rdbms\LoadBalancer.

Definition at line 71 of file LoadBalancerDisabled.php.

◆ getConnectionInternal()

Wikimedia\Rdbms\LoadBalancerDisabled::getConnectionInternal	(	$i,
		$groups = [],
		$domain = false,
		$flags = 0 )

Access: internal: Only to be used by DBConnRef

Parameters

int	$i	Specific (overrides $groups) or virtual (DB_PRIMARY/DB_REPLICA) server index
string[] \| string	$groups	Query group(s) in preference order; [] for the default group
string \| false	$domain	DB domain ID or false for the local domain
int	$flags	Bitfield of CONN_* class constants (e.g. CONN_TRX_AUTOCOMMIT)

Returns: never

Reimplemented from Wikimedia\Rdbms\LoadBalancer.

Definition at line 83 of file LoadBalancerDisabled.php.

◆ getConnectionRef()

Wikimedia\Rdbms\LoadBalancerDisabled::getConnectionRef	(	$i,
		$groups = [],
		$domain = false,
		$flags = 0 )

Parameters

int	$i	Specific (overrides $groups) or virtual (DB_PRIMARY/DB_REPLICA) server index
string[] \| string	$groups	Query group(s) in preference order; [] for the default group
string \| false	$domain	DB domain ID or false for the local domain
int	$flags	Bitfield of CONN_* class constants

Returns: never

Reimplemented from Wikimedia\Rdbms\LoadBalancer.

Definition at line 95 of file LoadBalancerDisabled.php.

◆ getMaintenanceConnectionRef()

Wikimedia\Rdbms\LoadBalancerDisabled::getMaintenanceConnectionRef	(	$i,
		$groups = [],
		$domain = false,
		$flags = 0 )

Parameters

int	$i	Specific (overrides $groups) or virtual (DB_PRIMARY/DB_REPLICA) server index
string[] \| string	$groups	Query group(s) in preference order; [] for the default group
string \| false	$domain	DB domain ID or false for the local domain
int	$flags	Bitfield of CONN_* class constants

Returns: never

Reimplemented from Wikimedia\Rdbms\LoadBalancer.

Definition at line 107 of file LoadBalancerDisabled.php.

◆ reallyOpenConnection()

Wikimedia\Rdbms\LoadBalancerDisabled::reallyOpenConnection	(		$i,
		DatabaseDomain	$domain,
		array	$lbInfo )

protected

Parameters

int	$i
DatabaseDomain	$domain
array	$lbInfo

Returns: never

Reimplemented from Wikimedia\Rdbms\LoadBalancer.

Definition at line 59 of file LoadBalancerDisabled.php.

◆ reuseConnection()

Wikimedia\Rdbms\LoadBalancerDisabled::reuseConnection ( IDatabase $conn )

Deprecated: since 1.39 noop

Parameters

IDatabase $conn

Reimplemented from Wikimedia\Rdbms\LoadBalancer.

Definition at line 111 of file LoadBalancerDisabled.php.

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

includes/libs/rdbms/loadbalancer/LoadBalancerDisabled.php

Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ __construct()

Member Function Documentation

◆ getConnection()

◆ getConnectionInternal()

◆ getConnectionRef()

◆ getMaintenanceConnectionRef()

◆ reallyOpenConnection()

◆ reuseConnection()