17080453a1
This is useful for updating a secondary database based on a commit to the main one, especially for using auto-commit. Change-Id: Iad9084d2fb0490ecdfd5fcc97db33bfbcbfa5d21
56 lines
1.5 KiB
PHP
56 lines
1.5 KiB
PHP
<?php
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use Wikimedia\Rdbms\IDatabase;
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/**
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* Deferrable Update for closure/callback updates via IDatabase::doAtomicSection()
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* @since 1.27
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*/
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class AtomicSectionUpdate implements DeferrableUpdate, DeferrableCallback {
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/** @var IDatabase */
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private $dbw;
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/** @var string */
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private $fname;
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/** @var callable|null */
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private $callback;
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/**
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* @param IDatabase $dbw DB handle; update aborts if a transaction now this rolls back
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* @param string $fname Caller name (usually __METHOD__)
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* @param callable $callback
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* @param IDatabase[] $conns Abort if a transaction now on one of these rolls back [optional]
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* @see IDatabase::doAtomicSection()
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*/
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public function __construct( IDatabase $dbw, $fname, callable $callback, array $conns = [] ) {
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$this->dbw = $dbw;
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$this->fname = $fname;
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$this->callback = $callback;
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// Register DB connections for which uncommitted changes are related to this update
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$conns[] = $dbw;
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foreach ( $conns as $conn ) {
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if ( $conn->trxLevel() ) {
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$conn->onTransactionResolution( [ $this, 'cancelOnRollback' ], $fname );
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}
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}
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}
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public function doUpdate() {
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if ( $this->callback ) {
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$this->dbw->doAtomicSection( $this->fname, $this->callback );
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}
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}
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/**
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* @private This method is public so that it works with onTransactionResolution()
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* @param int $trigger
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*/
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public function cancelOnRollback( $trigger ) {
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if ( $trigger === IDatabase::TRIGGER_ROLLBACK ) {
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$this->callback = null;
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}
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}
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public function getOrigin() {
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return $this->fname;
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}
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}
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