<?php
-/**
- *
- * @package MediaWiki
- *
- * DB accessable external objects
- *
- */
-require_once( 'LoadBalancer.php' );
-
-
-/** @package MediaWiki */
/**
* External database storage will use one (or more) separate connection pools
global $wgExternalBlobCache;
$wgExternalBlobCache = array();
+/**
+ * DB accessable external objects
+ * @ingroup ExternalStorage
+ */
class ExternalStoreDB {
- /**
- * Fetch data from given URL
- * @param string $url An url
- */
+ function __construct( $params = array() ) {
+ $this->mParams = $params;
+ }
+
+ /** @todo Document.*/
function &getLoadBalancer( $cluster ) {
- global $wgExternalServers, $wgExternalLoadBalancers;
- if ( !array_key_exists( $cluster, $wgExternalLoadBalancers ) ) {
- $wgExternalLoadBalancers[$cluster] = LoadBalancer::newFromParams( $wgExternalServers[$cluster] );
- }
- $wgExternalLoadBalancers[$cluster]->allowLagged(true);
- return $wgExternalLoadBalancers[$cluster];
+ $wiki = isset($this->mParams['wiki']) ? $this->mParams['wiki'] : false;
+
+ return wfGetLBFactory()->getExternalLB( $cluster, $wiki );
}
+ /** @todo Document.*/
function &getSlave( $cluster ) {
+ $wiki = isset($this->mParams['wiki']) ? $this->mParams['wiki'] : false;
$lb =& $this->getLoadBalancer( $cluster );
- return $lb->getConnection( DB_SLAVE );
+ return $lb->getConnection( DB_SLAVE, array(), $wiki );
}
+ /** @todo Document.*/
function &getMaster( $cluster ) {
+ $wiki = isset($this->mParams['wiki']) ? $this->mParams['wiki'] : false;
$lb =& $this->getLoadBalancer( $cluster );
- return $lb->getConnection( DB_MASTER );
+ return $lb->getConnection( DB_MASTER, array(), $wiki );
}
+ /** @todo Document.*/
function getTable( &$db ) {
$table = $db->getLBInfo( 'blobs table' );
if ( is_null( $table ) ) {
return $table;
}
- function fetchFromURL($url) {
- #
- # URLs have the form DB://cluster/id or DB://cluster/id/itemid for concatenated storage
- #
+ /**
+ * Fetch data from given URL
+ * @param string $url An url of the form DB://cluster/id or DB://cluster/id/itemid for concatened storage.
+ */
+ function fetchFromURL( $url ) {
$path = explode( '/', $url );
$cluster = $path[2];
$id = $path[3];
* Fetch a blob item out of the database; a cache of the last-loaded
* blob will be kept so that multiple loads out of a multi-item blob
* can avoid redundant database access and decompression.
+ * @param $cluster
+ * @param $id
+ * @param $itemID
* @return mixed
- * @access private
+ * @private
*/
function &fetchBlob( $cluster, $id, $itemID ) {
global $wgExternalBlobCache;
/**
* Insert a data item into a given cluster
*
- * @param string $cluster The cluster name
- * @param string $data The data item
+ * @param $cluster String: the cluster name
+ * @param $data String: the data item
* @return string URL
*/
function store( $cluster, $data ) {
- $fname = 'ExternalStoreDB::store';
-
- $dbw =& $this->getMaster( $cluster );
-
+ $dbw = $this->getMaster( $cluster );
$id = $dbw->nextSequenceValue( 'blob_blob_id_seq' );
- $dbw->insert( $this->getTable( $dbw ), array( 'blob_id' => $id, 'blob_text' => $data ), $fname );
+ $dbw->insert( $this->getTable( $dbw ),
+ array( 'blob_id' => $id, 'blob_text' => $data ),
+ __METHOD__ );
$id = $dbw->insertId();
if ( $dbw->getFlag( DBO_TRX ) ) {
$dbw->immediateCommit();
return "DB://$cluster/$id";
}
}
-?>