MediaWiki master
ILBFactory.php
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1<?php
20namespace Wikimedia\Rdbms;
21
22use Generator;
23use InvalidArgumentException;
24
48 public const SHUTDOWN_NORMAL = 0;
50 public const SHUTDOWN_NO_CHRONPROT = 1;
51
53 public const CLUSTER_MAIN_DEFAULT = 'DEFAULT';
54
87 public function __construct( array $conf );
88
96 public function destroy();
97
102 public function autoReconfigure(): void;
103
111 public function getLocalDomainID(): string;
112
123 public function redefineLocalDomain( $domain );
124
137 public function getLoadBalancer( $domain = false ): ILoadBalancer;
138
157 public function newMainLB( $domain = false ): ILoadBalancerForOwner;
158
170 public function getMainLB( $domain = false ): ILoadBalancer;
171
187 public function newExternalLB( $cluster ): ILoadBalancerForOwner;
188
198 public function getExternalLB( $cluster ): ILoadBalancer;
199
210 public function getAllMainLBs(): array;
211
220 public function getAllExternalLBs(): array;
221
228 public function getAllLBs();
229
238 public function shutdown(
239 $flags = self::SHUTDOWN_NORMAL,
240 ?callable $workCallback = null,
241 &$cpIndex = null,
242 &$cpClientId = null
243 );
244
255 public function flushReplicaSnapshots( $fname = __METHOD__ );
256
282 public function beginPrimaryChanges( $fname = __METHOD__ );
283
299 public function commitPrimaryChanges( $fname = __METHOD__, int $maxWriteDuration = 0 );
300
309 public function rollbackPrimaryChanges( $fname = __METHOD__ );
310
322 public function flushPrimarySessions( $fname = __METHOD__ );
323
330 public function hasTransactionRound();
331
340 public function isReadyForRoundOperations();
341
350 public function hasPrimaryChanges();
351
359 public function laggedReplicaUsed();
360
369 public function hasOrMadeRecentPrimaryChanges( $age = null );
370
392 public function waitForReplication( array $opts = [] );
393
402 public function setWaitForReplicationListener( $name, ?callable $callback = null );
403
410
417 public function setLocalDomainPrefix( $prefix );
418
424 public function closeAll( $fname = __METHOD__ );
425
429 public function setAgentName( $agent );
430
437 public function hasStreamingReplicaServers();
438
446 public function setDefaultReplicationWaitTimeout( $seconds );
447
461 public function setTableAliases( array $aliases );
462
475 public function setIndexAliases( array $aliases );
476
485 public function setDomainAliases( array $aliases );
486
494}
Detect high-contention DB queries via profiling calls.
Provide primary and replica IDatabase connections.
Manager of ILoadBalancer objects and, indirectly, IDatabase connections.
getLocalDomainID()
Get the local (and default) database domain ID of connection handles.
autoReconfigure()
Reload the configuration if necessary.
redefineLocalDomain( $domain)
Close all connections and redefine the local database domain.
beginPrimaryChanges( $fname=__METHOD__)
Wrap subsequent queries for all transaction round aware primary connections in a transaction.
getAllExternalLBs()
Get the tracked load balancer instances for all external clusters.
setTableAliases(array $aliases)
Make certain table names use their own database, schema, and table prefix when passed into SQL querie...
newMainLB( $domain=false)
Create a new load balancer instance for the main cluster that handles the given domain.
setLocalDomainPrefix( $prefix)
Set a new table prefix for the existing local domain ID for testing.
commitPrimaryChanges( $fname=__METHOD__, int $maxWriteDuration=0)
Commit all primary connection transactions and flush all replica connection transactions.
hasPrimaryChanges()
Determine if any primary connection has pending changes.
getLoadBalancer( $domain=false)
Get the tracked load balancer instance for a given domain.
waitForReplication(array $opts=[])
Waits for the replica database server to catch up to the current primary position.
rollbackPrimaryChanges( $fname=__METHOD__)
Rollback all primary connection transactions and flush all replica connection transactions.
closeAll( $fname=__METHOD__)
Close all connections on instantiated tracked load balancer instances.
flushPrimarySessions( $fname=__METHOD__)
Release important session-level state (named lock, table locks) as post-rollback cleanup.
__construct(array $conf)
Sub-classes may extend the required keys in $conf with additional parameters.
destroy()
Close all connections and make further attempts to open connections result in DBAccessError.
laggedReplicaUsed()
Determine if any lagged replica database server connection was used.
getAllLBs()
Get all tracked load balancer instances (generator)
setDomainAliases(array $aliases)
Convert certain database domains to alternative ones.
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.
disableChronologyProtection()
Disable the ChronologyProtector on all instantiated tracked load balancer instances.
setDefaultReplicationWaitTimeout( $seconds)
Set the default timeout for replication wait checks.
const SHUTDOWN_NO_CHRONPROT
Do not save "session consistency" DB replication positions.
hasTransactionRound()
Check if an explicit transaction round is active.
const SHUTDOWN_NORMAL
Idiom for "no special shutdown flags".
hasStreamingReplicaServers()
Whether it has streaming replica servers.
getAllMainLBs()
Get the tracked load balancer instances for all main clusters.
shutdown( $flags=self::SHUTDOWN_NORMAL, ?callable $workCallback=null, &$cpIndex=null, &$cpClientId=null)
Prepare all instantiated tracked load balancer instances for shutdown.
setWaitForReplicationListener( $name, ?callable $callback=null)
Add a callback to be run in every call to waitForReplication() prior to any waiting.
getTransactionProfiler()
Get the TransactionProfiler used by this instance.
setIndexAliases(array $aliases)
Convert certain index names to alternative names before querying the DB.
hasOrMadeRecentPrimaryChanges( $age=null)
Determine if any primary connection has pending/written changes from this request.
newExternalLB( $cluster)
Create a new load balancer instance for an external cluster.
isReadyForRoundOperations()
Check if transaction rounds can be started, committed, or rolled back right now.
flushReplicaSnapshots( $fname=__METHOD__)
Commit all replica database server transactions, clearing any point-in-time view snapshots.
Internal interface for load balancer instances exposed to their owner.
This class is a delegate to ILBFactory for a given database cluster.