将动态变量传递给服务构造函数 [英] Passing dynamic variables to a service constructor

问题描述

我在 Symfony2 中有一个如下所示的服务:

I have a service in Symfony2 that looks like:

services:
    MyCustomService:
        class:     MyClass
        arguments: //Arguments aren't static, but dynamic based on application logic.

是否可以将动态变量传递给服务的构造函数?

Is it possible to pass dynamic variables to a service's constructor?

控制器的 $this->get('MyCustomService');

有什么我遗漏的吗?

推荐答案

如果由于某种原因，您无法在实例化后配置服务(即 带有配置器).将责任委托给工厂怎么样?它将让您使用动态参数"实例化服务.

If, for whatever reason, you are unable to configure the service after instantiation (i.e., with a configurator). What about delegating that responsibility to a factory? It will let you instantiate services with "dynamic arguments".

services:
    MyCustomServiceFactory:
        class: MyClassFactory
        arguments: [ @dynamicService, %time_prefix% ]
    MyCustomService:
        class:              MyClass
        factory_service:    MyCustomServiceFactory
        factory_method:     get

您的工厂想要这样的东西:

Your factory would like something like this:

class MyClassFactory
{
    private $dynamicService;
    private $timePrefix;

    public function __construct(MyDynamicService $dynamicService, $timePrefix)
    {
        $this->dynamicService = $dynamicService;
        $this->timePrefix = $timePrefix;

    }

    public function get()
    {
        // Dynamic arguments based on application logic.
        $dynamicArg1 = $this->dynamicService->getArg()
        $dynamicArg2 = $this->timePrefix . time();

        return new MyClass($dynamicArg1, $dynamicArg2);
    }
}

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