449ee32451
Also removed true as second parameter to it from CloneDatabase.php since it is the default value of that parameter. Change-Id: I727ebae2bd4df0e26019985ce8c7ce73381c5642
125 lines
3.5 KiB
PHP
125 lines
3.5 KiB
PHP
<?php
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/**
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* Base code for update jobs that do something with some secondary
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* data extracted from article.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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* http://www.gnu.org/copyleft/gpl.html
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*
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* @file
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*/
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/**
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* Abstract base class for update jobs that do something with some secondary
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* data extracted from article.
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*
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* @note: subclasses should NOT start or commit transactions in their doUpdate() method,
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* a transaction will automatically be wrapped around the update. If need be,
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* subclasses can override the beginTransaction() and commitTransaction() methods.
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*/
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abstract class DataUpdate implements DeferrableUpdate {
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/**
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* Constructor
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*/
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public function __construct() {
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# noop
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}
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/**
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* Begin an appropriate transaction, if any.
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* This default implementation does nothing.
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*/
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public function beginTransaction() {
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//noop
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}
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/**
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* Commit the transaction started via beginTransaction, if any.
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* This default implementation does nothing.
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*/
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public function commitTransaction() {
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//noop
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}
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/**
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* Abort / roll back the transaction started via beginTransaction, if any.
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* This default implementation does nothing.
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*/
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public function rollbackTransaction() {
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//noop
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}
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/**
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* Convenience method, calls doUpdate() on every DataUpdate in the array.
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*
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* This methods supports transactions logic by first calling beginTransaction()
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* on all updates in the array, then calling doUpdate() on each, and, if all goes well,
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* then calling commitTransaction() on each update. If an error occurs,
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* rollbackTransaction() will be called on any update object that had beginTransaction()
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* called but not yet commitTransaction().
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*
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* This allows for limited transactional logic across multiple backends for storing
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* secondary data.
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*
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* @param array $updates a list of DataUpdate instances
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* @throws Exception|null
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*/
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public static function runUpdates( $updates ) {
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if ( empty( $updates ) ) {
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return; # nothing to do
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}
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$open_transactions = array();
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$exception = null;
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/**
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* @var $update DataUpdate
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* @var $trans DataUpdate
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*/
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try {
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// begin transactions
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foreach ( $updates as $update ) {
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$update->beginTransaction();
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$open_transactions[] = $update;
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}
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// do work
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foreach ( $updates as $update ) {
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$update->doUpdate();
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}
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// commit transactions
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while ( count( $open_transactions ) > 0 ) {
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$trans = array_pop( $open_transactions );
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$trans->commitTransaction();
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}
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} catch ( Exception $ex ) {
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$exception = $ex;
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wfDebug( "Caught exception, will rethrow after rollback: " .
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$ex->getMessage() . "\n" );
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}
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// rollback remaining transactions
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while ( count( $open_transactions ) > 0 ) {
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$trans = array_pop( $open_transactions );
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$trans->rollbackTransaction();
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}
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if ( $exception ) {
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throw $exception; // rethrow after cleanup
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}
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}
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}
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