gistfile1.php

<?php

/**
 * @Page(
 *   id = "my_page",
 *   title = @Translation("My page")
 *   routes = {
 *     @Route("/another/page/{foo}")
 *     @Route("/my/page/{foo}", "SomeOtherClass::access")
 *   }
 *   context = {
 *     "foo" = {
 *       "type" = "entity:foo"
 *     }
 *   }
 * )
 */
class MyPageContent implements ContentInterface {

  /**
   * Controller method/
   */
  public function content(FooEntityInterface $foo) {
    return entity_view('foo', $foo);
  }
  
  public function access(UserEntityInterface $user, FooEntityInterface $foo) {
    return in_array('administrator', $user->roles) || $foo->uid == $user->uid;
  }
}