MediaWiki REL1_31
ILBFactory.php
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1<?php
24namespace Wikimedia\Rdbms;
25
26use InvalidArgumentException;
27
33interface ILBFactory {
34 const SHUTDOWN_NO_CHRONPROT = 0; // don't save DB positions at all
35 const SHUTDOWN_CHRONPROT_ASYNC = 1; // save DB positions, but don't wait on remote DCs
36 const SHUTDOWN_CHRONPROT_SYNC = 2; // save DB positions, waiting on all DCs
37
61 public function __construct( array $conf );
62
68 public function destroy();
69
82 public function newMainLB( $domain = false );
83
90 public function getMainLB( $domain = false );
91
104 public function newExternalLB( $cluster );
105
112 public function getExternalLB( $cluster );
113
120 public function getAllMainLBs();
121
128 public function getAllExternalLBs();
129
138 public function forEachLB( $callback, array $params = [] );
139
146 public function shutdown(
147 $mode = self::SHUTDOWN_CHRONPROT_SYNC, callable $workCallback = null, &$cpIndex = null
148 );
149
155 public function flushReplicaSnapshots( $fname = __METHOD__ );
156
165 public function commitAll( $fname = __METHOD__, array $options = [] );
166
180 public function beginMasterChanges( $fname = __METHOD__ );
181
189 public function commitMasterChanges( $fname = __METHOD__, array $options = [] );
190
195 public function rollbackMasterChanges( $fname = __METHOD__ );
196
202 public function hasTransactionRound();
203
208 public function hasMasterChanges();
209
214 public function laggedReplicaUsed();
215
221 public function hasOrMadeRecentMasterChanges( $age = null );
222
246 public function waitForReplication( array $opts = [] );
247
256 public function setWaitForReplicationListener( $name, callable $callback = null );
257
265
276 public function commitAndWaitForReplication( $fname, $ticket, array $opts = [] );
277
282 public function getChronologyProtectorTouched( $dbName );
283
290
296 public function setDomainPrefix( $prefix );
297
301 public function closeAll();
302
306 public function setAgentName( $agent );
307
317 public function appendShutdownCPIndexAsQuery( $url, $time );
318
326 public function setRequestInfo( array $info );
327
341 public function setTableAliases( array $aliases );
342
356 public function setIndexAliases( array $aliases );
357}
Apache License January AND DISTRIBUTION Definitions License shall mean the terms and conditions for use
if(defined( 'MW_SETUP_CALLBACK')) $fname
Customization point after all loading (constants, functions, classes, DefaultSettings,...
Definition Setup.php:112
the array() calling protocol came about after MediaWiki 1.4rc1.
see documentation in includes Linker php for Linker::makeImageLink & $time
Definition hooks.txt:1795
null means default in associative array with keys and values unescaped Should be merged with default with a value of false meaning to suppress the attribute in associative array with keys and values unescaped & $options
Definition hooks.txt:2001
injection txt This is an overview of how MediaWiki makes use of dependency injection The design described here grew from the discussion of RFC T384 The term dependency this means that anything an object needs to operate should be injected from the the object itself should only know narrow no concrete implementation of the logic it relies on The requirement to inject everything typically results in an architecture that based on two main types of and essentially stateless service objects that use other service objects to operate on the value objects As of the beginning MediaWiki is only starting to use the DI approach Much of the code still relies on global state or direct resulting in a highly cyclical dependency which acts as the top level factory for services in MediaWiki which can be used to gain access to default instances of various services MediaWikiServices however also allows new services to be defined and default services to be redefined Services are defined or redefined by providing a callback the instantiator that will return a new instance of the service When it will create an instance of MediaWikiServices and populate it with the services defined in the files listed by thereby bootstrapping the DI framework Per $wgServiceWiringFiles lists includes ServiceWiring php
Definition injection.txt:37
An interface for generating database load balancers.
beginMasterChanges( $fname=__METHOD__)
Flush any master transaction snapshots and set DBO_TRX (if DBO_DEFAULT is set)
getAllExternalLBs()
Get cached (tracked) load balancers for all external database clusters.
setDomainPrefix( $prefix)
Set a new table prefix for the existing local domain ID for testing.
shutdown( $mode=self::SHUTDOWN_CHRONPROT_SYNC, callable $workCallback=null, &$cpIndex=null)
Prepare all tracked load balancers for shutdown.
commitAll( $fname=__METHOD__, array $options=[])
Commit open transactions on all connections.
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 object.
waitForReplication(array $opts=[])
Waits for the replica DBs to catch up to the current master position.
commitAndWaitForReplication( $fname, $ticket, array $opts=[])
Convenience method for safely running commitMasterChanges()/waitForReplication()
__construct(array $conf)
Construct a manager of ILoadBalancer objects.
destroy()
Disables all load balancers.
laggedReplicaUsed()
Detemine if any lagged replica DB connection was used.
getChronologyProtectorTouched( $dbName)
commitMasterChanges( $fname=__METHOD__, array $options=[])
Commit changes on all master connections.
appendShutdownCPIndexAsQuery( $url, $time)
Append ?cpPosIndex parameter to a URL for ChronologyProtector purposes if needed.
getExternalLB( $cluster)
Get a cached (tracked) load balancer for external storage.
getMainLB( $domain=false)
Get a cached (tracked) load balancer object.
disableChronologyProtection()
Disable the ChronologyProtector for all load balancers.
closeAll()
Close all open database connections on all open load balancers.
hasOrMadeRecentMasterChanges( $age=null)
Determine if any master connection has pending/written changes from this request.
hasTransactionRound()
Check if a transaction round is active.
getAllMainLBs()
Get cached (tracked) load balancers for all main database clusters.
hasMasterChanges()
Determine if any master connection has pending changes.
forEachLB( $callback, array $params=[])
Execute a function for each tracked load balancer The callback is called with the load balancer as th...
setIndexAliases(array $aliases)
Convert certain index names to alternative names before querying the DB.
getEmptyTransactionTicket( $fname)
Get a token asserting that no transaction writes are active.
newExternalLB( $cluster)
Create a new load balancer for external storage.
flushReplicaSnapshots( $fname=__METHOD__)
Commit all replica DB transactions so as to flush any REPEATABLE-READ or SSI snapshot.
setWaitForReplicationListener( $name, callable $callback=null)
Add a callback to be run in every call to waitForReplication() before waiting.
rollbackMasterChanges( $fname=__METHOD__)
Rollback changes on all master connections.
$params