php - 为什么将 Servicemanager 注入(inject)可调用而不是服务

Question

我目前正在使用 ZF2 serviceManager，我试图弄清楚为什么 serviceManager 没有将 sm 注入(inject)到实现 ServiceLocatorAwareInterface 的类中。

我的主要问题是我做对了吗？或者“服务”键不是用于实现 ServiceLocatorAwareInterface 的服务，而是用于不需要注入(inject)的服务？

在 Module.php 中

public function getServiceConfig() {
    return array(
        'invokables' => array(
            'myService1' => 'MyModule\Service\Service'
        ),
        'services' => array(
            'myService2' => new MyModule\Service\Service(),
        ),
    );
}

在 MyModule\Service\Service.php 中

namespace MyModule\Service;

use Zend\ServiceManager\ServiceManagerAwareInterface;
use Zend\ServiceManager\ServiceManager;

class Service implements ServiceManagerAwareInterface
{
    /**
     * @var ServiceManager
     */
    protected $serviceManager = NULL;

    /**
     * Retrieve service manager instance
     *
     * @return ServiceManager
     */
    public function getServiceManager()
    {
        return $this->serviceManager;
    }

    /**
     * Set service manager instance
     *
     * @param ServiceManager $serviceManager
     */
    public function setServiceManager(ServiceManager $serviceManager)
    {
        $this->serviceManager = $serviceManager;
    }
}

当我在 Controller 中调用服务时

<?php

namespace MyModule\Controller;

use Zend\Mvc\Controller\AbstractActionController;

class IndexController extends AbstractActionController
{

    public function IndexAction() {

        $service1   = $this->getServiceLocator()->get('myService1');
        $sm1        = $service1->getServiceManager(); 
        //$sm1 becomes a object of Zend\ServiceManager\ServiceManager
        //In other words i now can access the SM from within my service.

        $service2   = $this->getServiceLocator()->get('myService2');
        $sm2        = $service2->getServiceManager(); 
        //$sm2 becomes NULL
        //The service isn't aware of the SM and can't access it.

    }

}

Answer 1

如果您想使用 ServiceManagerAwareInterface 并将服务管理器自动注入(inject)到您的服务中，您应该继续使用“可调用”部分。

查看 /Zend/ServiceManager/ServiceManager.php，“服务”应该作为已经实例化的对象注册到 ServiceManager。当服务定位器在检索期间在其本地服务缓存中查找时，它假定“服务”已经完全设置并且不注入(inject) sm 或运行任何初始化程序。

“invokables”、“factories”、“abstract_factories”是动态创建的，并在“初始化程序”在新创建的服务实例上运行时注入(inject) sm(请参阅函数 create($name))。