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MDL-41436 implement new increment_revision_number() function

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This is intended as a revision counter for local modinfo caching. It should be a lot more reliable and faster than doing it in PHP. Please note you need to invalidate all course caches after using this.
This commit is contained in:
Petr Škoda
2013-09-10 14:11:44 +10:00
committed by Marina Glancy
parent 44ddd2a115
commit d82993dc7f
2 changed files with 84 additions and 0 deletions
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lib/tests/datalib_test.php
+54
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@@ -289,4 +289,58 @@ class core_datalib_testcase extends advanced_testcase {
$this->assertSame('ZOMBIES', $result->shortname);
$this->assertEquals($before + 1, $DB->perf_get_queries());
}
public function test_increment_revision_number() {
global $DB;
$this->resetAfterTest();
// Let's abuse course.timemodified column for now.
$course1 = $this->getDataGenerator()->create_course();
$course2 = $this->getDataGenerator()->create_course();
$DB->set_field('course', 'timemodified', 1, array());
$record1 = $DB->get_record('course', array('id'=>$course1->id));
$record2 = $DB->get_record('course', array('id'=>$course2->id));
$this->assertEquals(1, $record1->timemodified);
$this->assertEquals(1, $record2->timemodified);
// Incrementing some lower value.
$now = time();
increment_revision_number('course', 'timemodified', 'id = :id', array('id'=>$course1->id));
$record1 = $DB->get_record('course', array('id'=>$course1->id));
$record2 = $DB->get_record('course', array('id'=>$course2->id));
$this->assertGreaterThanOrEqual($now, $record1->timemodified);
$this->assertLessThanOrEqual($now+1, $record1->timemodified);
$this->assertEquals(1, $record2->timemodified);
// Incrementing in the same second.
$rev1 = $DB->get_field('course', 'timemodified', array('id'=>$course1->id));
$now = time();
increment_revision_number('course', 'timemodified', 'id = :id', array('id'=>$course1->id));
$this->assertGreaterThan($rev1, $rev1 = $DB->get_field('course', 'timemodified', array('id'=>$course1->id)));
increment_revision_number('course', 'timemodified', 'id = :id', array('id'=>$course1->id));
$this->assertGreaterThan($rev1, $rev1 = $DB->get_field('course', 'timemodified', array('id'=>$course1->id)));
increment_revision_number('course', 'timemodified', 'id = :id', array('id'=>$course1->id));
$this->assertGreaterThan($rev1, $rev1 = $DB->get_field('course', 'timemodified', array('id'=>$course1->id)));
$this->assertGreaterThan($now+2, $rev1);
// Recovering from runaway revision.
$DB->set_field('course', 'timemodified', time()+60*60*60, array('id'=>$course2->id));
$record2 = $DB->get_record('course', array('id'=>$course2->id));
$this->assertGreaterThan(time(), $record2->timemodified);
increment_revision_number('course', 'timemodified', 'id = :id', array('id'=>$course2->id));
$record2b = $DB->get_record('course', array('id'=>$course2->id));
$this->assertLessThan($record2->timemodified, $record2b->timemodified);
$this->assertGreaterThanOrEqual(time(), $record2b->timemodified);
// Update all revisions.
$now = time();
$DB->set_field('course', 'timemodified', 1, array());
increment_revision_number('course', 'timemodified', '');
$record1 = $DB->get_record('course', array('id'=>$course1->id));
$record2 = $DB->get_record('course', array('id'=>$course2->id));
$this->assertGreaterThanOrEqual($now, $record1->timemodified);
$this->assertLessThanOrEqual($now+1, $record1->timemodified);
$this->assertEquals($record1->timemodified, $record2->timemodified);
}
}