some useless calls / unitialized $matches arrays

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

diff --git a/includes/HistoryBlob.php b/includes/HistoryBlob.php
index 2fe5d1f..5875885 100644 (file)
--- a/includes/HistoryBlob.php
+++ b/includes/HistoryBlob.php
@@ -167,11 +167,22 @@ 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
  */
 class HistoryBlobStub {
-       var $mOldId, $mHash;
+       var $mOldId, $mHash, $mRef;
 
        /** @todo document */
        function HistoryBlobStub( $hash = '', $oldid = 0 ) {
@@ -186,29 +197,64 @@ class HistoryBlobStub {
                $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 ) );
+               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 );
        }
@@ -218,4 +264,44 @@ class HistoryBlobStub {
                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;
+       }
+}
+
+
 ?>