MediaWiki REL1_33
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
62 public function __construct( array $conf );
63
69 public function destroy();
70
78 public function getLocalDomainID();
79
85 public function resolveDomainID( $domain );
86
93 public function redefineLocalDomain( $domain );
94
107 public function newMainLB( $domain = false );
108
115 public function getMainLB( $domain = false );
116
129 public function newExternalLB( $cluster );
130
137 public function getExternalLB( $cluster );
138
145 public function getAllMainLBs();
146
153 public function getAllExternalLBs();
154
163 public function forEachLB( $callback, array $params = [] );
164
172 public function shutdown(
173 $mode = self::SHUTDOWN_CHRONPROT_SYNC,
174 callable $workCallback = null,
175 &$cpIndex = null,
176 &$cpClientId = null
177 );
178
184 public function flushReplicaSnapshots( $fname = __METHOD__ );
185
194 public function commitAll( $fname = __METHOD__, array $options = [] );
195
209 public function beginMasterChanges( $fname = __METHOD__ );
210
218 public function commitMasterChanges( $fname = __METHOD__, array $options = [] );
219
224 public function rollbackMasterChanges( $fname = __METHOD__ );
225
231 public function hasTransactionRound();
232
241 public function isReadyForRoundOperations();
242
247 public function hasMasterChanges();
248
253 public function laggedReplicaUsed();
254
260 public function hasOrMadeRecentMasterChanges( $age = null );
261
285 public function waitForReplication( array $opts = [] );
286
295 public function setWaitForReplicationListener( $name, callable $callback = null );
296
304
315 public function commitAndWaitForReplication( $fname, $ticket, array $opts = [] );
316
321 public function getChronologyProtectorTouched( $dbName );
322
329
336 public function setLocalDomainPrefix( $prefix );
337
341 public function closeAll();
342
346 public function setAgentName( $agent );
347
357 public function appendShutdownCPIndexAsQuery( $url, $index );
358
366 public function setRequestInfo( array $info );
367
381 public function setTableAliases( array $aliases );
382
395 public function setIndexAliases( array $aliases );
396}
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:123
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:1999
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)
getLocalDomainID()
Get the local (and default) database domain ID of connection handles.
redefineLocalDomain( $domain)
Close all connection and redefine the local domain for testing or schema creation.
getAllExternalLBs()
Get cached (tracked) load balancers for all external database clusters.
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.
setLocalDomainPrefix( $prefix)
Set a new table prefix for the existing local domain ID for testing.
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 and clear view snapshots on all master connections.
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 an explicit 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.
appendShutdownCPIndexAsQuery( $url, $index)
Append ?cpPosIndex parameter to a URL for ChronologyProtector purposes if needed.
shutdown( $mode=self::SHUTDOWN_CHRONPROT_SYNC, callable $workCallback=null, &$cpIndex=null, &$cpClientId=null)
Prepare all tracked load balancers for shutdown.
getEmptyTransactionTicket( $fname)
Get a token asserting that no transaction writes are active.
newExternalLB( $cluster)
Create a new load balancer for external storage.
isReadyForRoundOperations()
Check if transaction rounds can be started, committed, or rolled back right now.
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.
The wiki should then use memcached to cache various data To use multiple just add more items to the array To increase the weight of a make its entry a array("192.168.0.1:11211", 2))
$params