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Wikimedia\Rdbms\LBFactorySingle Class Reference

Manage a single hardcoded database connection. More...

Inherits Wikimedia\Rdbms\LBFactory.

Collaboration diagram for Wikimedia\Rdbms\LBFactorySingle:

Public Member Functions

 __construct (array $conf)
 You probably want to use newFromConnection instead.
 
 __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.
 
 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() 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 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

Manage a single hardcoded database connection.

Definition at line 30 of file LBFactorySingle.php.

Constructor & Destructor Documentation

◆ __construct()

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

You probably want to use newFromConnection instead.

Parameters
array$confAn associative array containing one of the following:
  • connection: The IDatabase connection object to use
  • lb: The ILoadBalancer object to use

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 41 of file LBFactorySingle.php.

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

◆ __destruct()

Wikimedia\Rdbms\LBFactorySingle::__destruct ( )

Definition at line 122 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 112 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 108 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$clusterExternal cluster name
Exceptions
InvalidArgumentExceptionIf $cluster is not recognized
Returns
ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 103 of file LBFactorySingle.php.

◆ getLBsForOwner()

Wikimedia\Rdbms\LBFactorySingle::getLBsForOwner ( )
protected

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

Most subclasses override this, we just provide an implementation here for the benefit of Wikibase's FakeLBFactory.

Returns
Generator|ILoadBalancerForOwner[]

Reimplemented from Wikimedia\Rdbms\LBFactory.

Definition at line 116 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 $domain parameter.
Parameters
string | false$domainDomain ID, or false for the current domain
Returns
ILoadBalancer

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 94 of file LBFactorySingle.php.

◆ newDisabled()

static Wikimedia\Rdbms\LBFactorySingle::newDisabled ( array  $params = [])
static
Parameters
array$paramsParameter map to LBFactorySingle::__construct() and LoadBalancerDisabled::__construct()
Returns
LBFactorySingle
Since
1.40

Definition at line 82 of file LBFactorySingle.php.

◆ 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$clusterExternal cluster name
Exceptions
InvalidArgumentExceptionIf $cluster is not recognized
Returns
ILoadBalancerForOwner

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 98 of file LBFactorySingle.php.

◆ newFromConnection()

static Wikimedia\Rdbms\LBFactorySingle::newFromConnection ( IDatabase  $db,
array  $params = [] 
)
static
Parameters
IDatabase$dbLive connection handle
array$paramsParameter map to LBFactorySingle::__constructs()
Returns
LBFactorySingle
Since
1.28

Definition at line 68 of file LBFactorySingle.php.

References 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 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.

Note
The local/default database domain used by the load balancer instance will still inherit from this ILBFactory instance, regardless of the $domain parameter.
Parameters
string | false$domainDomain ID, or false for the current domain
Returns
ILoadBalancerForOwner

Implements Wikimedia\Rdbms\ILBFactory.

Definition at line 89 of file LBFactorySingle.php.


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