Database connection manager. More...
Public Member Functions | |
| getReadConnection (array $groups=null) | |
| getReadConnectionRef (array $groups=null) | |
| getWriteConnection () | |
| getWriteConnectionRef () | |
| prepareForUpdates () | |
| Forces all future calls to getReadConnection() to return a write connection. | |
 Public Member Functions inherited from Wikimedia\Rdbms\ConnectionManager | |
| __construct (LoadBalancer $loadBalancer, $domain=false, array $groups=[]) | |
| releaseConnection (IDatabase $db) | |
Private Attributes | |
| bool | $forceWriteConnection = false |
Detailed Description
Database connection manager.
This manages access to master and replica databases. It also manages state that indicates whether the replica databases are possibly outdated after a write operation, and thus the master database should be used for subsequent read operations.
- Note
- : Services that access overlapping sets of database tables, or interact with logically related sets of data in the database, should share a SessionConsistentConnectionManager. Services accessing unrelated sets of information may prefer to not share a SessionConsistentConnectionManager, so they can still perform read operations against replica databases after a (unrelated, per the assumption) write operation to the master database. Generally, sharing a SessionConsistentConnectionManager improves consistency (by avoiding race conditions due to replication lag), but can reduce performance (by directing more read operations to the master database server).
- Since
- 1.29
Definition at line 45 of file SessionConsistentConnectionManager.php.
Member Function Documentation
◆ getReadConnection()
| Wikimedia\Rdbms\SessionConsistentConnectionManager::getReadConnection | ( | array | $groups = null | ) |
- Since
- 1.29
- Parameters
-
string[] | null $groups
- Returns
- Database
Reimplemented from Wikimedia\Rdbms\ConnectionManager.
Definition at line 69 of file SessionConsistentConnectionManager.php.
References Wikimedia\Rdbms\ConnectionManager\$groups.
◆ getReadConnectionRef()
| Wikimedia\Rdbms\SessionConsistentConnectionManager::getReadConnectionRef | ( | array | $groups = null | ) |
- Since
- 1.29
- Parameters
-
string[] | null $groups
- Returns
- DBConnRef
Reimplemented from Wikimedia\Rdbms\ConnectionManager.
Definition at line 94 of file SessionConsistentConnectionManager.php.
References Wikimedia\Rdbms\ConnectionManager\$groups.
◆ getWriteConnection()
| Wikimedia\Rdbms\SessionConsistentConnectionManager::getWriteConnection | ( | ) |
- Since
- 1.29
- Returns
- Database
Reimplemented from Wikimedia\Rdbms\ConnectionManager.
Definition at line 82 of file SessionConsistentConnectionManager.php.
References Wikimedia\Rdbms\SessionConsistentConnectionManager\prepareForUpdates().
◆ getWriteConnectionRef()
| Wikimedia\Rdbms\SessionConsistentConnectionManager::getWriteConnectionRef | ( | ) |
- Since
- 1.29
- Returns
- DBConnRef
Reimplemented from Wikimedia\Rdbms\ConnectionManager.
Definition at line 107 of file SessionConsistentConnectionManager.php.
References Wikimedia\Rdbms\SessionConsistentConnectionManager\prepareForUpdates().
◆ prepareForUpdates()
| Wikimedia\Rdbms\SessionConsistentConnectionManager::prepareForUpdates | ( | ) |
Forces all future calls to getReadConnection() to return a write connection.
Use this before performing read operations that are critical for a future update.
- Since
- 1.29
Definition at line 58 of file SessionConsistentConnectionManager.php.
Referenced by Wikimedia\Rdbms\SessionConsistentConnectionManager\getWriteConnection(), and Wikimedia\Rdbms\SessionConsistentConnectionManager\getWriteConnectionRef().
Member Data Documentation
◆ $forceWriteConnection
|
private |
Definition at line 50 of file SessionConsistentConnectionManager.php.
The documentation for this class was generated from the following file:
- includes/libs/rdbms/connectionmanager/SessionConsistentConnectionManager.php
