* 'Listusers/'.'sysop' => 'Listusers/sysop'

[lhc/web/wiklou.git] / includes / HistoryBlob.php

diff --git a/includes/HistoryBlob.php b/includes/HistoryBlob.php
index 5b1f453..f7fa77a 100644 (file)
--- a/includes/HistoryBlob.php
+++ b/includes/HistoryBlob.php
@@ -167,6 +167,17 @@ class ConcatenatedGzipHistoryBlob extends HistoryBlob
        }
 }
 
+
+/**
+ * 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
  */
@@ -188,27 +199,48 @@ class HistoryBlobStub {
 
        /** @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 ) );
+               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 );
        }
@@ -257,4 +289,5 @@ class HistoryBlobCurStub {
        }
 }
 
+
 ?>