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

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

    pub struct System { /* fields omitted */ }

System is an actor which manages runtime.

Before starting any actix's actors, `System` actor has to be created and started with `System::run()` call. This method creates new `Arbiter` in current thread and starts `System` actor.

# Examples

    extern crate actix;

    use actix::prelude::*;
    use std::time::Duration;

    struct Timer {
        dur: Duration,
    }

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

        // stop system after `self.dur` seconds
        fn started(&mut self, ctx: &mut Context<Self>) {
            ctx.run_later(self.dur, |act, ctx| {
                // Stop current running system.
                System::current().stop();
            });
        }
    }

    fn main() {
        // initialize system and run it.
        // This function blocks current thread
        let code = System::run(|| {
            // Start `Timer` actor
            Timer {
                dur: Duration::new(0, 1),
            }.start();
        });

        std::process::exit(code);
    }

## Methods

###

`impl System`

####

`pub fn builder() -> Builder` |

Build a new system with a customized tokio runtime.

This allows to customize the runtime. See struct level docs on `Builder` for more information.

####

`pub fn new<T>(name: T) -> SystemRunner where T: Into<String>,` |

Create new system.

This method panics if it can not create tokio runtime

####

`pub fn current() -> System` |

Get current running system.

####

`pub fn with_current<F, R>(f: F) -> R where F: FnOnce(&System) -> R,` |

Execute function with system reference.

####

`pub fn stop(&self)` |

Stop the system

####

`pub fn arbiter(&self) -> &Addr<Arbiter>` |

System arbiter

####

`pub fn registry(&self) -> &SystemRegistry` |

Get current system registry.

####

`pub fn run<F>(f: F) -> i32 where F: FnOnce() + 'static,` |

This function will start tokio runtime and will finish once the `System::stop()` message get called. Function `f` get called within tokio runtime context.

## Trait Implementations

###

`impl Debug for System`

####

`fn fmt(&self, f: &mut Formatter) -> Result<(), Error>` |

Formats the value using the given formatter. Read more

###

`impl Clone for System`

####

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

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 System`

###

`impl Sync for System`

## 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`

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Immutably borrows from an owned value. Read more

###

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

[src]

####

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

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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`

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