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

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

    pub struct Registry { /* fields omitted */ }

Actors registry

Actor can register itself as a service. Service can be defined as `ArbiterService` which is unique per arbiter or `SystemService` which is unique per system.

If arbiter service is used outside of running arbiter, it panics.

# 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 ArbiterService 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>) {
          // get MyActor1 addres from the registry
          let act = Arbiter::registry().get::<MyActor1>();
          act.do_send(Ping);
       }
    }

    fn main() {
        // initialize system
        let code = System::run(|| {

            // Start MyActor1 in new Arbiter
            Arbiter::start(|_| {
                MyActor2
            });
        });
    }

## Methods

###

`impl Registry`

####

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

Query registry for specific actor. Returns address of the actor. If actor is not registered, starts new actor and return address of newly created actor.

####

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

Check if actor is in registry, if so, return its address

####

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

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

## Trait Implementations

###

`impl Clone for Registry`

####

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

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 Registry`

###

`impl !Sync for Registry`

## Blanket Implementations

###

`impl<T> ToOwned for T where T: Clone,`

[src]

#### `type Owned = T`

####

`fn to_owned(&self) -> T`

[src]

Creates owned data from borrowed data, usually by cloning. Read more

####

`fn clone_into(&self, target: &mut T)`

[src]

🔬 This is a nightly-only experimental API. (`toowned_clone_into`)

recently added

Uses borrowed data to replace owned data, usually by cloning. Read more

###

`impl<T> From for T`

[src]

####

`fn from(t: T) -> T`

[src]

Performs the conversion.

###

`impl<T, U> Into for T where U: From<T>,`

[src]

####

`fn into(self) -> U`

[src]

Performs the conversion.

###

`impl<T, U> TryFrom for T where T: From<U>,`

[src]

#### `type Error = !`

🔬 This is a nightly-only experimental API. (`try_from`)

The type returned in the event of a conversion error.

####

`fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

###

`impl<T> Borrow for T where T: ?Sized,`

[src]

####

`fn borrow(&self) -> &T`

[src]

Immutably borrows from an owned value. Read more

###

`impl<T> BorrowMut for T where T: ?Sized,`

[src]

####

`fn borrow_mut(&mut self) -> &mut T`

[src]

Mutably borrows from an owned value. Read more

###

`impl<T, U> TryInto for T where U: TryFrom<T>,`

[src]

#### `type Error = <U as TryFrom<T>>::Error`

🔬 This is a nightly-only experimental API. (`try_from`)

The type returned in the event of a conversion error.

####

`fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>`

[src]

🔬 This is a nightly-only experimental API. (`try_from`)

Performs the conversion.

###

`impl<T> Any for T where T: 'static + ?Sized,`

[src]

####

`fn get_type_id(&self) -> TypeId`

[src]

🔬 This is a nightly-only experimental API. (`get_type_id`)

this method will likely be replaced by an associated static

Gets the `TypeId` of `self`. Read more

###

`impl<T> Erased for T`

# Help

## Keyboard Shortcuts

`?`
  Show this help dialog
`S`
  Focus the search field
`↑`
  Move up in search results
`↓`
  Move down in search results
`↹`
  Switch tab
`⏎`
  Go to active search result
`+`
  Expand all sections
`-`
  Collapse all sections

## Search Tricks

Prefix searches with a type followed by a colon (e.g. `fn:`) to restrict the search to a given type.

Accepted types are: `fn`, `mod`, `struct`, `enum`, `trait`, `type`, `macro`, and `const`.

Search functions by type signature (e.g. `vec -> usize` or `* -> vec`)

Search multiple things at once by splitting your query with comma (e.g. `str,u8` or `String,struct:Vec,test`)