Symfony Service 详解

默认Service，$container->get('app_service.default')

[code=language-ini]services:
app_service.default:
class: AppBundle\Service\DefaultService

传递参数，可传递服务、变量、字符串、数组，多个参数

[code=language-ini]services:
app_service.argument_1:
class: ~
arguments: [ '@service_container' ]
app_service.argument_2:
class: ~
arguments: [ '%kernel.root_dir%' ]
app_service.argument_3:
class: ~
arguments: [ '我是字符串' ]
app_service.argument_4:
class: ~
arguments: [ [1,2,3] ]
app_service.argument_5:
class: ~
arguments: [ '@router', '%kernel.root_dir%' ]

传递参数之 call，可调用多次call

[code=language-ini]services:
app_service.call_1:
class: ~
calls:
- [ setContainer, ['@service_container'] ]
app_service.call_2:
class: ~
calls:
- [ setContainer, ['@service_container'] ]
- [ setRouter, ['@router'] ]

标签，相当于给服务分类（事件、模板、数据库等），可通过

$container->findTaggedServiceIds($tagName) 获取对应服务

[code=language-ini]services:
app_service.tag_1:
class: ~
tags:
- { name: 'kernel.event_subscriber' }
app_service.tag_2:
class: ~
tags:
- { name: 'kernel.kernel.event_listener', event: 'kernel.request', method: 'onKernelRequest', priority: 255 }
- { name: 'kernel.kernel.event_listener', event: 'kernel.response', method: 'onKernelResponse' }
app_service.tag_3:
class: ~
tags:
- { name: 'form.type' }
app_service.tag_4:
class: ~
tags:
- { name: 'twig.extension' }
app_service.tag_5:
class: ~
tags:
- { name: 'doctrine.event_subscriber' }

属性 public，可以使用 $container->get('app_service.public')，不能使用 $container->get('app_service.private')，私有服务可以作为参数传递到其它服务中

[code=language-ini]services:
app_service.public:
class: ~
public: true
app_service.private:
class: ~
public: false
app_service.test:
arguments: [ '@app_service.private' ]

属性 parent，继承父类

[code=language-ini]services:
app_service.parent:
class: ~
app_service.child_1:
class: ~
parent: 'app_service.parent'

属性 abstract，抽象类，只能做为父类，被重新创建服务，参考 parent。

或 $container->setDefinition($newService, new DefinitionDecorator('app_service.abstract_1'))

[code=language-ini]services:
app_service.abstract_1:
class: ~
abstract: true

参数、标签、其它属性基本上都是可以同时使用的