class LockTest

class LockTest extends KernelTestBase {
  
  /**
   * Database lock backend to test.
   *
   * @var \Drupal\Core\Lock\DatabaseLockBackend
   */
  protected $lock;
  
  /**
   * {@inheritdoc}
   */
  protected function setUp() : void {
    parent::setUp();
    $this->lock = new DatabaseLockBackend($this->container
      ->get('database'));
  }
  
  /**
   * Tests backend release functionality.
   */
  public function testBackendLockRelease() : void {
    $success = $this->lock
      ->acquire('lock_a');
    $this->assertTrue($success, 'Could acquire first lock.');
    // This function is not part of the backend, but the default database
    // backend implement it, we can here use it safely.
    $is_free = $this->lock
      ->lockMayBeAvailable('lock_a');
    $this->assertFalse($is_free, 'First lock is unavailable.');
    $this->lock
      ->release('lock_a');
    $is_free = $this->lock
      ->lockMayBeAvailable('lock_a');
    $this->assertTrue($is_free, 'First lock has been released.');
    $success = $this->lock
      ->acquire('lock_b');
    $this->assertTrue($success, 'Could acquire second lock.');
    $success = $this->lock
      ->acquire('lock_b');
    $this->assertTrue($success, 'Could acquire second lock a second time within the same request.');
    $this->lock
      ->release('lock_b');
    // Test acquiring and releasing a lock with a long key (over 255 chars).
    $long_key = 'long_key:BZoMiSf9IIPULsJ98po18TxJ6T4usd3MZrLE0d3qMgG6iAgDlOi1G3oMap7zI5df84l7LtJBg4bOj6XvpO6vDRmP5h5QbA0Bj9rVFiPIPAIQZ9qFvJqTALiK1OR3GpOkWQ4vgEA4LkY0UfznrWBeuK7IWZfv1um6DLosnVXd1z1cJjvbEUqYGJj92rwHfhYihLm8IO9t3P2gAvEkH5Mhc8GBoiTsIDnP01Te1kxGFHO3RuvJIxPnHmZtSdBggmuVN7x9';
    $success = $this->lock
      ->acquire($long_key);
    $this->assertTrue($success, 'Could acquire long key lock.');
    // This function is not part of the backend, but the default database
    // backend implement it, we can here use it safely.
    $is_free = $this->lock
      ->lockMayBeAvailable($long_key);
    $this->assertFalse($is_free, 'Long key lock is unavailable.');
    $this->lock
      ->release($long_key);
    $is_free = $this->lock
      ->lockMayBeAvailable($long_key);
    $this->assertTrue($is_free, 'Long key lock has been released.');
  }
  
  /**
   * Tests backend release functionality.
   */
  public function testBackendLockReleaseAll() : void {
    $success = $this->lock
      ->acquire('lock_a');
    $this->assertTrue($success, 'Could acquire first lock.');
    $success = $this->lock
      ->acquire('lock_b');
    $this->assertTrue($success, 'Could acquire second lock.');
    $this->lock
      ->releaseAll();
    $is_free = $this->lock
      ->lockMayBeAvailable('lock_a');
    $this->assertTrue($is_free, 'First lock has been released.');
    $is_free = $this->lock
      ->lockMayBeAvailable('lock_b');
    $this->assertTrue($is_free, 'Second lock has been released.');
    // Test that the semaphore table having been removed does not cause
    // exceptions.
    $success = $this->lock
      ->acquire('lock_a');
    $this->assertTrue($success, 'Could re-acquire first lock.');
    Database::getConnection()->schema()
      ->dropTable('semaphore');
    $this->lock
      ->releaseAll();
    $is_free = $this->lock
      ->lockMayBeAvailable('lock_a');
    $this->assertTrue($is_free, 'Re-acquired lock has been released.');
  }

}