/**
* setMeta and getMeta currently aren't used for anything, I just thought
* they might be useful in the future.
- * @param string $meta a single string
+ * @param $meta String: a single string.
*/
function setMeta( $meta ) {}
*/
function addItem() {}
- /**
+ /**
* Get item by hash
*/
function getItem( $hash ) {}
-
+
# Set the "default text"
# This concept is an odd property of the current DB schema, whereby each text item has a revision
- # associated with it. The default text is the text of the associated revision. There may, however,
+ # associated with it. The default text is the text of the associated revision. There may, however,
# be other revisions in the same object
function setText() {}
function ConcatenatedGzipHistoryBlob() {
if ( !function_exists( 'gzdeflate' ) ) {
- die( "Need zlib support to read or write this kind of history object (ConcatenatedGzipHistoryBlob)\n" );
+ throw new MWException( "Need zlib support to read or write this kind of history object (ConcatenatedGzipHistoryBlob)\n" );
}
}
}
/** @todo document */
- function uncompress() {
+ function uncompress() {
if ( $this->mCompressed ) {
$this->mItems = unserialize( gzinflate( $this->mItems ) );
$this->mCompressed = false;
}
}
+
+/**
+ * One-step cache variable to hold base blobs; operations that
+ * pull multiple revisions may often pull multiple times from
+ * the same blob. By keeping the last-used one open, we avoid
+ * redundant unserialization and decompression overhead.
+ */
+global $wgBlobCache;
+$wgBlobCache = array();
+
+
/**
* @package MediaWiki
*/
class HistoryBlobStub {
- var $mOldId, $mHash;
+ var $mOldId, $mHash, $mRef;
/** @todo document */
function HistoryBlobStub( $hash = '', $oldid = 0 ) {
$this->mHash = $hash;
}
-
+
/**
* Sets the location (old_id) of the main object to which this object
* points
$this->mOldId = $id;
}
+ /**
+ * Sets the location (old_id) of the referring object
+ */
+ function setReferrer( $id ) {
+ $this->mRef = $id;
+ }
+
+ /**
+ * Gets the location of the referring object
+ */
+ function getReferrer() {
+ return $this->mRef;
+ }
+
/** @todo document */
function getText() {
- $dbr =& wfGetDB( DB_SLAVE );
- $row = $dbr->selectRow( 'text', array( 'old_flags', 'old_text' ), array( 'old_id' => $this->mOldId ) );
- if( !$row ) {
- return false;
- }
- $flags = explode( ',', $row->old_flags );
- if( !in_array( 'object', $flags ) ) {
- return false;
- }
-
- if( in_array( 'gzip', $flags ) ) {
- // This shouldn't happen, but a bug in the compress script
- // may at times gzip-compress a HistoryBlob object row.
- $obj = unserialize( gzinflate( $row->old_text ) );
+ $fname = 'HistoryBlob::getText';
+ global $wgBlobCache;
+ if( isset( $wgBlobCache[$this->mOldId] ) ) {
+ $obj = $wgBlobCache[$this->mOldId];
} else {
- $obj = unserialize( $row->old_text );
- }
-
- if( !is_object( $obj ) ) {
- // Correct for old double-serialization bug.
- $obj = unserialize( $obj );
+ $dbr =& wfGetDB( DB_SLAVE );
+ $row = $dbr->selectRow( 'text', array( 'old_flags', 'old_text' ), array( 'old_id' => $this->mOldId ) );
+ if( !$row ) {
+ return false;
+ }
+ $flags = explode( ',', $row->old_flags );
+ if( in_array( 'external', $flags ) ) {
+ $url=$row->old_text;
+ @list($proto,$path)=explode('://',$url,2);
+ if ($path=="") {
+ wfProfileOut( $fname );
+ return false;
+ }
+ require_once('ExternalStore.php');
+ $row->old_text=ExternalStore::fetchFromUrl($url);
+
+ }
+ if( !in_array( 'object', $flags ) ) {
+ return false;
+ }
+
+ if( in_array( 'gzip', $flags ) ) {
+ // This shouldn't happen, but a bug in the compress script
+ // may at times gzip-compress a HistoryBlob object row.
+ $obj = unserialize( gzinflate( $row->old_text ) );
+ } else {
+ $obj = unserialize( $row->old_text );
+ }
+
+ if( !is_object( $obj ) ) {
+ // Correct for old double-serialization bug.
+ $obj = unserialize( $obj );
+ }
+
+ // Save this item for reference; if pulling many
+ // items in a row we'll likely use it again.
+ $obj->uncompress();
+ $wgBlobCache = array( $this->mOldId => $obj );
}
return $obj->getItem( $this->mHash );
}
return $this->mHash;
}
}
+
+
+/**
+ * To speed up conversion from 1.4 to 1.5 schema, text rows can refer to the
+ * leftover cur table as the backend. This avoids expensively copying hundreds
+ * of megabytes of data during the conversion downtime.
+ *
+ * Serialized HistoryBlobCurStub objects will be inserted into the text table
+ * on conversion if $wgFastSchemaUpgrades is set to true.
+ *
+ * @package MediaWiki
+ */
+class HistoryBlobCurStub {
+ var $mCurId;
+
+ /** @todo document */
+ function HistoryBlobCurStub( $curid = 0 ) {
+ $this->mCurId = $curid;
+ }
+
+ /**
+ * Sets the location (cur_id) of the main object to which this object
+ * points
+ */
+ function setLocation( $id ) {
+ $this->mCurId = $id;
+ }
+
+ /** @todo document */
+ function getText() {
+ $dbr =& wfGetDB( DB_SLAVE );
+ $row = $dbr->selectRow( 'cur', array( 'cur_text' ), array( 'cur_id' => $this->mCurId ) );
+ if( !$row ) {
+ return false;
+ }
+ return $row->cur_text;
+ }
+}
+
+
?>
dépôts / lhc / web / wiklou.git / blobdiff