# actix_web::actix::actix::dev::SystemRegistry - Rust
API documentation for the Rust `SystemRegistry` struct in crate `actix_web`.
Keywords: rust, rustlang, rust-lang, SystemRegistry

# Struct actix_web::actix::actix::dev::SystemRegistry [−]

    pub struct SystemRegistry { /* fields omitted */ }

System wide actors registry

System registry serves same purpose as Registry, except it is shared across all arbiters.

# Example

    use actix::prelude::*;

    #[derive(Message)]
    struct Ping;

    #[derive(Default)]
    struct MyActor1;

    impl Actor for MyActor1 {
        type Context = Context<Self>;
    }
    impl actix::Supervised for MyActor1 {}

    impl SystemService for MyActor1 {
        fn service_started(&mut self, ctx: &mut Context<Self>) {
            println!("Service started");
        }
    }

    impl Handler<Ping> for MyActor1 {
        type Result = ();

        fn handle(&mut self, _: Ping, ctx: &mut Context<Self>) {
            println!("ping");
        }
    }

    struct MyActor2;

    impl Actor for MyActor2 {
        type Context = Context<Self>;

        fn started(&mut self, _: &mut Context<Self>) {
            let act = System::current().registry().get::<MyActor1>();
            act.do_send(Ping);
        }
    }

    fn main() {
        // initialize system
        let code = System::run(|| {
            // Start MyActor1
            let addr = MyActor1.start();

            // Start MyActor2
            let addr = MyActor2.start();
        });
    }

## Methods

###

`impl SystemRegistry`

####

`pub fn get<A>(&self) -> Addr<A> where A: Actor<Context = Context<A>> + SystemService,` |

Return address of the service. If service actor is not running it get started in the system.

####

`pub fn set<A>(&self, addr: Addr<A>) where A: Actor<Context = Context<A>> + SystemService,` |

Add new actor to the registry by address, panic if actor is already running

## Trait Implementations

###

`impl Clone for SystemRegistry`

####

`fn clone(&self) -> SystemRegistry` |

Returns a copy of the value. Read more

####

`fn clone_from(&mut self, source: &Self)`

1.0.0
[src]

Performs copy-assignment from `source`. Read more

## Auto Trait Implementations

###

`impl Send for SystemRegistry`

###

`impl Sync for SystemRegistry`

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