发布于 2015-08-27 16:46:10 | 158 次阅读 | 评论: 0 | 来源: 网络整理
2.6 新版功能: The new setFactory()
method was introduced in Symfony 2.6. Refer to older versions for the
syntax for factories prior to 2.6.
Symfony’s Service Container provides a powerful way of controlling the creation of objects, allowing you to specify arguments passed to the constructor as well as calling methods and setting parameters. Sometimes, however, this will not provide you with everything you need to construct your objects. For this situation, you can use a factory to create the object and tell the service container to call a method on the factory rather than directly instantiating the class.
Suppose you have a factory that configures and returns a new NewsletterManager
object:
class NewsletterManagerFactory
{
public static function createNewsletterManager()
{
$newsletterManager = new NewsletterManager();
// ...
return $newsletterManager;
}
}
To make the NewsletterManager object available as a service, you can
configure the service container to use the
NewsletterFactory::createNewsletterManager() factory method:
services:
newsletter_manager:
class: NewsletterManager
factory: [NewsletterManagerFactory, createNewsletterManager]
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<service id="newsletter_manager" class="NewsletterManager">
<factory class="NewsletterManagerFactory" method="createNewsletterManager" />
</service>
</services>
</services>
use SymfonyComponentDependencyInjectionDefinition;
// ...
$definition = new Definition('NewsletterManager');
$definition->setFactory(array('NewsletterManagerFactory', 'createNewsletterManager'));
$container->setDefinition('newsletter_manager', $definition);
注解
When using a factory to create services, the value chosen for the class
option has no effect on the resulting service. The actual class name only
depends on the object that is returned by the factory. However, the configured
class name may be used by compiler passes and therefore should be set to a
sensible value.
Now, the method will be called statically. If the factory class itself should be instantiated and the resulting object’s method called, configure the factory itself as a service. In this case, the method (e.g. get) should be changed to be non-static.
services:
newsletter_manager.factory:
class: NewsletterManagerFactory
newsletter_manager:
class: NewsletterManager
factory: ["@newsletter_manager.factory", createNewsletterManager]
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<service id="newsletter_manager.factory" class="NewsletterManagerFactory" />
<service id="newsletter_manager" class="NewsletterManager">
<factory service="newsletter_manager.factory" method="createNewsletterManager" />
</service>
</services>
</container>
use SymfonyComponentDependencyInjectionReference;
use SymfonyComponentDependencyInjectionDefinition;
// ...
$container->register('newsletter_manager.factory', 'NewsletterManagerFactory');
$newsletterManager = new Definition();
$newsletterManager->setFactory(array(
new Reference('newsletter_manager.factory'),
'createNewsletterManager'
));
$container->setDefinition('newsletter_manager', $newsletterManager);
If you need to pass arguments to the factory method, you can use the arguments
options inside the service container. For example, suppose the createNewsletterManager
method in the previous example takes the templating service as an argument:
services:
newsletter_manager.factory:
class: NewsletterManagerFactory
newsletter_manager:
class: NewsletterManager
factory: ["@newsletter_manager.factory", createNewsletterManager]
arguments:
- "@templating"
<?xml version="1.0" encoding="UTF-8" ?>
<container xmlns="http://symfony.com/schema/dic/services"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://symfony.com/schema/dic/services http://symfony.com/schema/dic/services/services-1.0.xsd">
<services>
<service id="newsletter_manager.factory" class="NewsletterManagerFactory"/>
<service id="newsletter_manager" class="NewsletterManager">
<factory service="newsletter_manager.factory" method="createNewsletterManager"/>
<argument type="service" id="templating"/>
</service>
</services>
</container>
use SymfonyComponentDependencyInjectionReference;
use SymfonyComponentDependencyInjectionDefinition;
// ...
$container->register('newsletter_manager.factory', 'NewsletterManagerFactory');
$newsletterManager = new Definition(
'NewsletterManager',
array(new Reference('templating'))
);
$newsletterManager->setFactory(array(
new Reference('newsletter_manager.factory'),
'createNewsletterManager'
));
$container->setDefinition('newsletter_manager', $newsletterManager);