# Trait actix_web::actix::actix::SystemService[−]

    pub trait SystemService: Actor<Context = Context<Self>> + Supervised + Default {
        fn start_service(sys: &Addr<Arbiter>) -> Addr<Self> { ... }
        fn service_started(&mut self, ctx: &mut Context<Self>) { ... }
        fn from_registry() -> Addr<Self> { ... }
    }

Trait defines system's service.

## Provided Methods

### `fn start_service(sys: &Addr<Arbiter>) -> Addr<Self>`

Construct and srtart system service

### `fn service_started(&mut self, ctx: &mut Context<Self>)`

Method is called during service initialization.

### `fn from_registry() -> Addr<Self>`

Get actor's address from system registry

## Implementors

- `impl SystemService for ProcessSignals` |

- `impl SystemService for Resolver` |

- `impl SystemService for ClientConnector` | [src]

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