[Stable8.2] Use a CappedCache in the user database backend (#24413)

* Use a CappedCache in the user database backend

When running with a user database backend on large installations the
cache can grow to significant sizes. This can be especially problematic
when running big cron/repair jobs.

* Allow indirect set in CappedMemoryCache

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/lib/cache/cappedmemorycache.php b/tests/lib/cache/cappedmemorycache.php
index 5444d928421..a8fb273b80a 100644
--- a/tests/lib/cache/cappedmemorycache.php
+++ b/tests/lib/cache/cappedmemorycache.php
@@ -64,4 +64,16 @@ class CappedMemoryCache extends \Test_Cache {
 		$this->assertFalse($this->instance->hasKey('2_value1'));
 		$this->assertFalse($this->instance->hasKey('3_value1'));
 	}
+
+	function testIndirectSet() {
+		$this->instance->set('array', []);
+
+		$this->instance['array'][] = 'foo';
+
+		$this->assertEquals(['foo'], $this->instance->get('array'));
+
+		$this->instance['array']['bar'] = 'qwerty';
+
+		$this->assertEquals(['foo', 'bar' => 'qwerty'], $this->instance->get('array'));
+	}
 }