ZF3: ServiceNotFoundException while creating a class with Abstract Factory registered in ServiceManager - zend-framework

Question

I got problem with the Abstract Factories example.
I get ServiceNotFoundException while creating a class with Abstract Factory registered in the ServiceManager.
First I download zend-servicemanager with composer
composer require zendframework/zend-servicemanager
Then I run the ServiceManager example in the single file (for simplicity).
<?php
require_once 'vendor/autoload.php';
use Interop\Container\ContainerInterface;
use Zend\ServiceManager\ServiceManager;
use Zend\ServiceManager\Factory\InvokableFactory;
use Zend\ServiceManager\Factory\FactoryInterface;
use Zend\ServiceManager\Factory\AbstractFactoryInterface;
Class that should be obtained with ServiceManager.
class A
{
public $text;
public function __construct()
{
$this->text = "Default text";
}
}
I use MyAbstractFactory from documentation.
class MyAbstractFactory implements AbstractFactoryInterface
{
public function canCreate(ContainerInterface $container, $requestedName)
{
return in_array('Traversable', class_implements($requestedName), true);
}
public function __invoke(ContainerInterface $container,
$requestedName,
array $options = null)
{
return $requestedName();
}
}
I create ServiceManager with registered Abstract Factory.
$serviceManager = new ServiceManager([
// Neither works
//'abstract_factories' => array('MyAbstractFactory')
'abstract_factories' => array( new MyAbstractFactory() )
//'abstract_factories' => array( MyAbstractFactory::class )
/*
'abstract_factories' => [
MyAbstractFactory::class => new MyAbstractFactory()
]
*/
]);
Finally I try to obtain the instance of class A.
$a = $serviceManager->get(A::class);
var_dump($a);
I get
Fatal error: Uncaught Zend\ServiceManager\Exception\ServiceNotFoundException: Unable to resolve service "A" to a factory; are you certain you provided it during configuration?
with the stack trace
.\vendor\zendframework\zend-servicemanager\src\ServiceManager.php(763): Zend\ServiceManager\ServiceManager->getFactory('A') #1
.\vendor\zendframework\zend-servicemanager\src\ServiceManager.php(200): Zend\ServiceManager\ServiceManager->doCreate('A') #2
.\script.php(53): Zend\ServiceManager\ServiceManager->get('A') #3

Answer 1

My formulation of the problem was wrong. #rkeet's comment made it clear.
As my objective was the working example of the Abstract Factory registration within ServiceManager, I post the single-file script where canCreate() is simplified just to check if the class exists.
<?php
// composer require zendframework/zend-servicemanager
require_once 'vendor/autoload.php';
use Interop\Container\ContainerInterface;
use Zend\ServiceManager\ServiceManager;
use Zend\ServiceManager\Factory\AbstractFactoryInterface;
class A
{
public $text;
public function __construct()
{
$this->text = "Default text";
}
}
class MyAbstractFactory implements AbstractFactoryInterface
{
public function canCreate(ContainerInterface $container, $requestedName)
{
return class_exists($requestedName);
}
public function __invoke(ContainerInterface $container,
$requestedName,
array $options = null)
{
return new $requestedName();
}
}
$serviceManager = new ServiceManager([
//'abstract_factories' => array('MyAbstractFactory') // works
//'abstract_factories' => array( new MyAbstractFactory() ) // works
'abstract_factories' => array( MyAbstractFactory::class ) // also works
]);
try {
$a = $serviceManager->get(A::class);
var_dump($a);
echo "<br/>\n";
$b = $serviceManager->get(B::class);
var_dump($b);
} catch (Exception $e) {
echo $e->getMessage() . "<br/>\n";
echo "{$e->getFile()} ({$e->getLine()})";
}
?>
As #rkeet pointed, if someone needs the original example working, class A should implement Traversable.