Change to avoid a join in notice inbox

The join in notice_inbox is causing temp-table sorting on identi.ca,
so I'm trying a finer-tuned approach.

classes/Notice.php

@@ -215,6 +215,7 @@ class Notice extends Memcached_DataObject
             if (common_config('queue', 'enabled')) {
                 $notice->blowAuthorCaches();
             } else {
+                common_debug("Blowing caches for new notice.");
                 $notice->blowCaches();
             }
         }
@@ -285,7 +286,7 @@ class Notice extends Memcached_DataObject
         // Clear the user's cache
         $cache = common_memcache();
         if (!empty($cache)) {
-            $cache->delete(common_cache_key('user:notices_with_friends:' . $this->profile_id));
+            $cache->delete(common_cache_key('notice_inbox:by_user:'.$this->profile_id));
         }
         $this->blowNoticeCache($blowLast);
         $this->blowPublicCache($blowLast);
@@ -307,9 +308,9 @@ class Notice extends Memcached_DataObject
                     $member->group_id = $group_inbox->group_id;
                     if ($member->find()) {
                         while ($member->fetch()) {
-                            $cache->delete(common_cache_key('user:notices_with_friends:' . $member->profile_id));
+                            $cache->delete(common_cache_key('notice_inbox:by_user:' . $member->profile_id));
                             if ($blowLast) {
-                                $cache->delete(common_cache_key('user:notices_with_friends:' . $member->profile_id . ';last'));
+                                $cache->delete(common_cache_key('notice_inbox:by_user:' . $member->profile_id . ';last'));
                             }
                         }
                     }
@@ -352,9 +353,9 @@ class Notice extends Memcached_DataObject
                          'WHERE subscription.subscribed = ' . $this->profile_id);
 
             while ($user->fetch()) {
-                $cache->delete(common_cache_key('user:notices_with_friends:' . $user->id));
+                $cache->delete(common_cache_key('notice_inbox:by_user:'.$user_id));
                 if ($blowLast) {
-                    $cache->delete(common_cache_key('user:notices_with_friends:' . $user->id . ';last'));
+                    $cache->delete(common_cache_key('notice_inbox:by_user:'.$user_id.';last'));
                 }
             }
             $user->free();
@@ -613,6 +614,26 @@ class Notice extends Memcached_DataObject
         return $wrapper;
     }
 
+    function getStreamByIds($ids)
+    {
+        $cache = common_memcache();
+
+        if (!empty($cache)) {
+            $notices = array();
+            foreach ($ids as $id) {
+                $notices[] = Notice::staticGet('id', $id);
+            }
+            return new ArrayWrapper($notices);
+        } else {
+            $notice = new Notice();
+            $notice->whereAdd('id in (' . implode(', ', $ids) . ')');
+            $notice->orderBy('id DESC');
+
+            $notice->find();
+            return $notice;
+        }
+    }
+
     function publicStream($offset=0, $limit=20, $since_id=0, $before_id=0, $since=null)
     {
 

classes/Notice_inbox.php

 <?php
 /*
  * Laconica - a distributed open-source microblogging tool
- * Copyright (C) 2008, Controlez-Vous, Inc.
+ * Copyright (C) 2008, 2009, Control Yourself, Inc.
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU Affero General Public License as published by
@@ -21,7 +21,11 @@ if (!defined('LACONICA')) { exit(1); }
 
 require_once INSTALLDIR.'/classes/Memcached_DataObject.php';
 
-class Notice_inbox extends Memcached_DataObject 
+// We keep 5 pages of inbox notices in memcache, +1 for pagination check
+
+define('INBOX_CACHE_WINDOW', 101);
+
+class Notice_inbox extends Memcached_DataObject
 {
     ###START_AUTOCODE
     /* the code below is auto generated do not remove the above tag */
@@ -38,4 +42,97 @@ class Notice_inbox extends Memcached_DataObject
 
     /* the code above is auto generated do not remove the tag below */
     ###END_AUTOCODE
+
+    function stream($user_id, $offset=0, $limit=20, $since_id=0, $before_id=0, $since=null)
+    {
+        $cache = common_memcache();
+
+        if (empty($cache) ||
+            $since_id != 0 || $before_id != 0 || !is_null($since) ||
+            ($offset + $limit) > INBOX_CACHE_WINDOW) {
+            common_debug('Doing direct DB hit for notice_inbox since the params are screwy.');
+            return Notice_inbox::_streamDirect($user_id, $offset, $limit, $since_id, $before_id, $since);
+        }
+
+        $idkey = common_cache_key('notice_inbox:by_user:'.$user_id);
+
+        $idstr = $cache->get($idkey);
+
+        if (!empty($idstr)) {
+            // Cache hit! Woohoo!
+            common_debug('Cache hit for notice_inbox.');
+            $window = explode(',', $idstr);
+            $ids = array_slice($window, $offset, $limit);
+            return $ids;
+        }
+
+        $laststr = common_cache_key($idkey.';last');
+
+        if (!empty($laststr)) {
+            common_debug('Cache hit for notice_inbox on last item.');
+
+            $window = explode(',', $laststr);
+            $last_id = $window[0];
+            $new_ids = Notice_inbox::_streamDirect($user_id, 0, INBOX_CACHE_WINDOW,
+                                                   $last_id, null, null);
+
+            $new_window = array_merge($new_ids, $window);
+
+            $new_windowstr = implode(',', $new_window);
+
+            $result = $cache->set($idkey, $new_windowstr);
+            $result = $cache->set($idkey . ';last', $new_windowstr);
+
+            $ids = array_slice($new_window, $offset, $limit);
+
+            return $ids;
+        }
+
+        $window = Notice_inbox::_streamDirect($user_id, 0, INBOX_CACHE_WINDOW,
+                                              null, null, null);
+
+        $windowstr = implode(',', $new_window);
+
+        $result = $cache->set($idkey, $windowstr);
+        $result = $cache->set($idkey . ';last', $windowstr);
+
+        $ids = array_slice($window, $offset, $limit);
+
+        return $ids;
+    }
+
+    function _streamDirect($user_id, $offset, $limit, $since_id, $before_id, $since)
+    {
+        $inbox = new Notice_inbox();
+
+        $inbox->user_id = $user_id;
+
+        if ($since_id != 0) {
+            $inbox->whereAdd('notice_id > ' . $since_id);
+        }
+
+        if ($before_id != 0) {
+            $inbox->whereAdd('notice_id < ' . $before_id);
+        }
+
+        if (!is_null($since)) {
+            $inbox->whereAdd('created > \'' . date('Y-m-d H:i:s', $since) . '\'');
+        }
+
+        $inbox->orderBy('notice_id DESC');
+
+        if (!is_null($offset)) {
+            $inbox->limit($offset, $limit);
+        }
+
+        $ids = array();
+
+        if ($inbox->find()) {
+            while ($inbox->fetch()) {
+                $ids[] = $inbox->notice_id;
+            }
+        }
+
+        return $ids;
+    }
 }

classes/User.php

@@ -451,34 +451,9 @@ class User extends Memcached_DataObject
         } else if ($enabled === true ||
                    ($enabled == 'transitional' && $this->inboxed == 1)) {
 
-            $cache = common_memcache();
+            $ids = Notice_inbox::stream($this->id, $offset, $limit, $since_id, $before_id, $since);
 
-            if (!empty($cache)) {
-
-                # Get the notices out of the cache
-
-                $notices = $cache->get(common_cache_key($cachekey));
-
-                # On a cache hit, return a DB-object-like wrapper
-
-                if ($notices !== false) {
-                    $wrapper = new ArrayWrapper(array_slice($notices, $offset, $limit));
-                    return $wrapper;
-                }
-            }
-
-            $inbox = Notice_inbox::stream($this->id, $offset, $limit, $since_id, $before_id, $since);
-
-            $ids = array();
-
-            while ($inbox->fetch()) {
-                $ids[] = $inbox->notice_id;
-            }
-
-            $inbox->free();
-            unset($inbox);
-
-            return Notice::getStreamByIds($ids, 'user:notices_with_friends:' . $this->id);
+            return Notice::getStreamByIds($ids);
         }
     }