class LockFunctionalTest

class LockFunctionalTest extends BrowserTestBase {
  
  /**
   * Modules to enable.
   *
   * @var array
   */
  protected static $modules = [
    'system_test',
  ];
  
  /**
   * {@inheritdoc}
   */
  protected $defaultTheme = 'stark';
  
  /**
   * Confirms that we can acquire and release locks in two parallel requests.
   */
  public function testLockAcquire() {
    $lock = $this->container
      ->get('lock');
    $lock_acquired = 'TRUE: Lock successfully acquired in \\Drupal\\system_test\\Controller\\SystemTestController::lockAcquire()';
    $lock_not_acquired = 'FALSE: Lock not acquired in \\Drupal\\system_test\\Controller\\SystemTestController::lockAcquire()';
    $this->assertTrue($lock->acquire('system_test_lock_acquire'), 'Lock acquired by this request.', 'Lock');
    $this->assertTrue($lock->acquire('system_test_lock_acquire'), 'Lock extended by this request.', 'Lock');
    $lock->release('system_test_lock_acquire');
    // Cause another request to acquire the lock.
    $this->drupalGet('system-test/lock-acquire');
    $this->assertSession()
      ->pageTextContains($lock_acquired);
    // The other request has finished, thus it should have released its lock.
    $this->assertTrue($lock->acquire('system_test_lock_acquire'), 'Lock acquired by this request.', 'Lock');
    // This request holds the lock, so the other request cannot acquire it.
    $this->drupalGet('system-test/lock-acquire');
    $this->assertSession()
      ->pageTextContains($lock_not_acquired);
    $lock->release('system_test_lock_acquire');
    // Try a very short timeout and lock breaking.
    $this->assertTrue($lock->acquire('system_test_lock_acquire', 0.5), 'Lock acquired by this request.', 'Lock');
    sleep(1);
    // The other request should break our lock.
    $this->drupalGet('system-test/lock-acquire');
    $this->assertSession()
      ->pageTextContains($lock_acquired);
    // We cannot renew it, since the other thread took it.
    $this->assertFalse($lock->acquire('system_test_lock_acquire'), 'Lock cannot be extended by this request.', 'Lock');
    // Check the shut-down function.
    $lock_acquired_exit = 'TRUE: Lock successfully acquired in \\Drupal\\system_test\\Controller\\SystemTestController::lockExit()';
    $this->drupalGet('system-test/lock-exit');
    $this->assertSession()
      ->pageTextContains($lock_acquired_exit);
    $this->assertTrue($lock->acquire('system_test_lock_exit'), 'Lock acquired by this request after the other request exits.', 'Lock');
  }
  
  /**
   * Tests that the persistent lock is persisted between requests.
   */
  public function testPersistentLock() {
    $persistent_lock = $this->container
      ->get('lock.persistent');
    // Get a persistent lock.
    $this->drupalGet('system-test/lock-persist/lock1');
    $this->assertSession()
      ->pageTextContains('TRUE: Lock successfully acquired in SystemTestController::lockPersist()');
    // Ensure that a shutdown function has not released the lock.
    $this->assertFalse($persistent_lock->lockMayBeAvailable('lock1'));
    $this->drupalGet('system-test/lock-persist/lock1');
    $this->assertSession()
      ->pageTextContains('FALSE: Lock not acquired in SystemTestController::lockPersist()');
    // Get another persistent lock.
    $this->drupalGet('system-test/lock-persist/lock2');
    $this->assertSession()
      ->pageTextContains('TRUE: Lock successfully acquired in SystemTestController::lockPersist()');
    $this->assertFalse($persistent_lock->lockMayBeAvailable('lock2'));
    // Release the first lock and try getting it again.
    $persistent_lock->release('lock1');
    $this->drupalGet('system-test/lock-persist/lock1');
    $this->assertSession()
      ->pageTextContains('TRUE: Lock successfully acquired in SystemTestController::lockPersist()');
  }

}