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<title>[BuddyPress][11101] trunk: Activity: Invalidate query caches when a user's 'last_activity' is updated.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="http://buddypress.trac.wordpress.org/changeset/11101">11101</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"http://buddypress.trac.wordpress.org/changeset/11101","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>boonebgorges</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2016-09-14 02:06:10 +0000 (Wed, 14 Sep 2016)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Activity: Invalidate query caches when a user's 'last_activity' is updated.

User 'last_activity' is stored in the activity table, but not updated
via the Activity API, so regular invalidation techniques do not work.

In addition, 'last_activity' is quite frequently updated, meaning that
the activity query cache becomes less valuable. To mitigate this, the
current changeset separates the cache for queries containing
'last_activity' from the cache for those that do not.

Fixes <a href="http://buddypress.trac.wordpress.org/ticket/7245">#7245</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcbpactivitybpactivitycachephp">trunk/src/bp-activity/bp-activity-cache.php</a></li>
<li><a href="#trunksrcbpactivityclassesclassbpactivityactivityphp">trunk/src/bp-activity/classes/class-bp-activity-activity.php</a></li>
<li><a href="#trunksrcbpcoreclassesclassbpcoreuserphp">trunk/src/bp-core/classes/class-bp-core-user.php</a></li>
<li><a href="#trunksrcbpmembersbpmemberscachephp">trunk/src/bp-members/bp-members-cache.php</a></li>
<li><a href="#trunktestsphpunittestcasesmemberscachephp">trunk/tests/phpunit/testcases/members/cache.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcbpactivitybpactivitycachephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/bp-activity/bp-activity-cache.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/bp-activity/bp-activity-cache.php       2016-09-14 01:34:44 UTC (rev 11100)
+++ trunk/src/bp-activity/bp-activity-cache.php 2016-09-14 02:06:10 UTC (rev 11101)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -75,7 +75,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">  * @return bool True on success, false on failure.
</span><span class="cx" style="display: block; padding: 0 10px">  */
</span><span class="cx" style="display: block; padding: 0 10px"> function bp_activity_reset_cache_incrementor() {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        return bp_core_reset_incrementor( 'bp_activity' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ $without_last_activity = bp_core_reset_incrementor( 'bp_activity' );
+       $with_last_activity    = bp_core_reset_incrementor( 'bp_activity_with_last_activity' );
+       return $without_last_activity && $with_last_activity;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'bp_activity_delete',    'bp_activity_reset_cache_incrementor' );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'bp_activity_add',       'bp_activity_reset_cache_incrementor' );
</span></span></pre></div>
<a id="trunksrcbpactivityclassesclassbpactivityactivityphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/bp-activity/classes/class-bp-activity-activity.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/bp-activity/classes/class-bp-activity-activity.php      2016-09-14 01:34:44 UTC (rev 11100)
+++ trunk/src/bp-activity/classes/class-bp-activity-activity.php        2016-09-14 02:06:10 UTC (rev 11101)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -645,10 +645,20 @@
</span><span class="cx" style="display: block; padding: 0 10px">                         */
</span><span class="cx" style="display: block; padding: 0 10px">                        $activity_ids_sql = apply_filters( 'bp_activity_paged_activities_sql', $activity_ids_sql, $r );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $cached = bp_core_get_incremented_cache( $activity_ids_sql, 'bp_activity' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 /*
+                        * Queries that include 'last_activity' are cached separately,
+                        * since they are generally much less long-lived.
+                        */
+                       if ( preg_match( '/a\.type NOT IN \([^\)]*\'last_activity\'[^\)]*\)/', $activity_ids_sql ) ) {
+                               $cache_group = 'bp_activity';
+                       } else {
+                               $cache_group = 'bp_activity_with_last_activity';
+                       }
+
+                       $cached = bp_core_get_incremented_cache( $activity_ids_sql, $cache_group );
</ins><span class="cx" style="display: block; padding: 0 10px">                         if ( false === $cached ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $activity_ids = $wpdb->get_col( $activity_ids_sql );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                bp_core_set_incremented_cache( $activity_ids_sql, 'bp_activity', $activity_ids );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         bp_core_set_incremented_cache( $activity_ids_sql, $cache_group, $activity_ids );
</ins><span class="cx" style="display: block; padding: 0 10px">                         } else {
</span><span class="cx" style="display: block; padding: 0 10px">                                $activity_ids = $cached;
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -708,10 +718,10 @@
</span><span class="cx" style="display: block; padding: 0 10px">                         * @param string $sort      Sort direction for query.
</span><span class="cx" style="display: block; padding: 0 10px">                         */
</span><span class="cx" style="display: block; padding: 0 10px">                        $total_activities_sql = apply_filters( 'bp_activity_total_activities_sql', "SELECT count(DISTINCT a.id) FROM {$bp->activity->table_name} a {$join_sql} {$where_sql}", $where_sql, $sort );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        $cached = bp_core_get_incremented_cache( $total_activities_sql, 'bp_activity' );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                 $cached = bp_core_get_incremented_cache( $total_activities_sql, $cache_group );
</ins><span class="cx" style="display: block; padding: 0 10px">                         if ( false === $cached ) {
</span><span class="cx" style="display: block; padding: 0 10px">                                $total_activities = $wpdb->get_var( $total_activities_sql );
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                                bp_core_set_incremented_cache( $total_activities_sql, 'bp_activity', $total_activities );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                         bp_core_set_incremented_cache( $total_activities_sql, $cache_group, $total_activities );
</ins><span class="cx" style="display: block; padding: 0 10px">                         } else {
</span><span class="cx" style="display: block; padding: 0 10px">                                $total_activities = $cached;
</span><span class="cx" style="display: block; padding: 0 10px">                        }
</span></span></pre></div>
<a id="trunksrcbpcoreclassesclassbpcoreuserphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/bp-core/classes/class-bp-core-user.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/bp-core/classes/class-bp-core-user.php  2016-09-14 01:34:44 UTC (rev 11100)
+++ trunk/src/bp-core/classes/class-bp-core-user.php    2016-09-14 02:06:10 UTC (rev 11101)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -912,6 +912,16 @@
</span><span class="cx" style="display: block; padding: 0 10px">                // Set cache.
</span><span class="cx" style="display: block; padding: 0 10px">                wp_cache_set( $user_id, $activity[ $user_id ], 'bp_last_activity' );
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                /**
+                * Fires when a user's last_activity value has been updated.
+                *
+                * @since 2.7.0
+                *
+                * @param int    $user_id ID of the user.
+                * @param string $time    Last activity timestamp, in 'Y-m-d H:i:s' format.
+                */
+               do_action( 'bp_core_user_updated_last_activity', $user_id, $time );
+
</ins><span class="cx" style="display: block; padding: 0 10px">                 return $updated;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre></div>
<a id="trunksrcbpmembersbpmemberscachephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/bp-members/bp-members-cache.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/bp-members/bp-members-cache.php 2016-09-14 01:34:44 UTC (rev 11100)
+++ trunk/src/bp-members/bp-members-cache.php   2016-09-14 02:06:10 UTC (rev 11101)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -61,3 +61,15 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'wpmu_delete_user', 'bp_members_clear_member_type_cache' );
</span><span class="cx" style="display: block; padding: 0 10px"> add_action( 'delete_user', 'bp_members_clear_member_type_cache' );
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+/**
+ * Invalidate activity caches when a user's last_activity value is changed.
+ *
+ * @since 2.7.0
+ *
+ * @return bool True on success, false on failure.
+ */
+function bp_members_reset_activity_cache_incrementor() {
+       return bp_core_reset_incrementor( 'bp_activity_with_last_activity' );
+}
+add_action( 'bp_core_user_updated_last_activity', 'bp_members_reset_activity_cache_incrementor' );
</ins></span></pre></div>
<a id="trunktestsphpunittestcasesmemberscachephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/testcases/members/cache.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/testcases/members/cache.php   2016-09-14 01:34:44 UTC (rev 11100)
+++ trunk/tests/phpunit/testcases/members/cache.php     2016-09-14 02:06:10 UTC (rev 11101)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -22,5 +22,61 @@
</span><span class="cx" style="display: block; padding: 0 10px">                // check if function references cache or hits the DB by comparing query count
</span><span class="cx" style="display: block; padding: 0 10px">                $this->assertEquals( $num_queries, $wpdb->num_queries );
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * @ticket BP7237
+        * @ticket BP6643
+        * @ticket BP7245
+        */
+       public function test_last_activity_should_bust_activity_with_last_activity_cache() {
+               global $wpdb;
+
+               $u1 = $this->factory->user->create();
+               $u2 = $this->factory->user->create();
+
+               $time_1 = date( 'Y-m-d H:i:s', time() - HOUR_IN_SECONDS );
+               $time_2 = date( 'Y-m-d H:i:s', time() - ( HOUR_IN_SECONDS * 2 ) );
+               bp_update_user_last_activity( $u1, $time_1 );
+               bp_update_user_last_activity( $u2, $time_2 );
+
+               $activity_args_a = array(
+                       'filter' => array(
+                               'object' => buddypress()->members->id,
+                               'action' => 'last_activity',
+                       ),
+                       'max' => 1,
+               );
+
+               $activity_args_b = array(
+                       'filter' => array(
+                               'action' => 'new_member',
+                       ),
+                       'fields' => 'ids',
+               );
+
+               // Prime bp_activity and bp_activity_with_last_activity caches.
+               $a1 = bp_activity_get( $activity_args_a );
+               $expected = array( $u1, $u2 );
+               $found = array_map( 'intval', wp_list_pluck( $a1['activities'], 'user_id' ) );
+               $this->assertSame( $expected, $found );
+
+               $b1 = bp_activity_get( $activity_args_b );
+
+               // Bump u2 activity so it should appear first.
+               $new_time = date( 'Y-m-d H:i:s', time() - HOUR_IN_SECONDS );
+               bp_update_user_last_activity( $u2, $new_time );
+
+               $a2 = bp_activity_get( $activity_args_a );
+               $expected = array( $u2, $u1 );
+               $found = array_map( 'intval', wp_list_pluck( $a2['activities'], 'user_id' ) );
+               $this->assertSame( $expected, $found );
+
+               $num_queries = $wpdb->num_queries;
+
+               // bp_activity cache should not have been touched.
+               $b2 = bp_activity_get( $activity_args_b );
+               $this->assertEqualSets( $b1, $b2 );
+               $this->assertSame( $num_queries, $wpdb->num_queries );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span></span></pre>
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