Struct ActivityId

Source

pub struct ActivityId<A> { /* private fields */ }

Expand description

Handle to an Activity that has been registered, with a type parameter to track the activity’s type. Can be used to add type-checked closures to the activity, which will be used as event listeners.

Implements Copy and Clone

Implementations§

Source §

impl<A: Activity> ActivityId<A>

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pub fn on_enter<F>(&self, f: F)
where F: Fn(&mut A) + 'static,

Registers a callback closure that is called when an activity changes from inactive to active. Multiple handlers can be registered.

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pub fn on_enter_domained<F>(&self, f: F)
where F: Fn(&mut A, &mut DomainState) + 'static,

Same as on_enter but with domain access in closure

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pub fn on_leave<F>(&self, f: F)
where F: Fn(&mut A) + 'static,

Registers a callback closure that is called when an activity changes from active to inactive. Multiple handlers can be registered.

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pub fn on_leave_domained<F>(&self, f: F)
where F: Fn(&mut A, &mut DomainState) + 'static,

Same as on_leave but with domain access in closure

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pub fn on_delete<F>(&self, f: F)
where F: FnOnce(A) + 'static,

Registers a callback closure that is called when an activity is deleted. Only one handler can be registered because it takes ownership of the data. A second registration will overwrite the first handler.

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pub fn on_delete_domained<F>(&self, f: F)
where F: FnOnce(A, &mut DomainState) + 'static,

Same as on_delete but with domain access in closure

Registers a callback closure on an activity with a specific topic to listen to.

By default, the activity will only receive calls when it is active. Use subscribe_masked for more control over this behavior.

§Example

struct MyActivity { id: usize };
struct MyMessage { text: String };

pub fn main() {
    let activity = nuts::new_activity(MyActivity { id: 0 } );
    activity.subscribe(
        |activity: &mut MyActivity, message: &MyMessage|
        println!("Subscriber with ID {} received text: {}", activity.id, message.text)
    );
}

In the example above, a subscription is created that waits for messages of type MyMessage to be published. So far, the code inside the closure is not executed and nothing is printed to the console.

Note that the first argument of the closure is a mutable reference to the activity object. The second argument is a read-only reference to the published message. Both types must match exactly or otherwise the closure will not be accepted by the compiler.

A function with the correct argument types can also be used to subscribe.

struct MyActivity { id: usize };
struct MyMessage { text: String };

pub fn main() {
    let activity = nuts::new_activity(MyActivity { id: 0 } );
    activity.subscribe(MyActivity::print_text);
}

impl MyActivity {
    fn print_text(&mut self, message: &MyMessage) {
        println!("Subscriber with ID {} received text: {}", self.id, message.text)
    }
}

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pub fn subscribe_mut<F, MSG>(&self, f: F)
where F: Fn(&mut A, &mut MSG) + 'static, MSG: Any,

Same as subscribe but gives mutable access to the message object.

Make sure to use the correct signature for the function, the Rust compiler may give strange error messages otherwise. For example, the message must be borrowed by the subscription handler.

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pub fn subscribe_domained<F, MSG>(&self, f: F)
where F: Fn(&mut A, &mut DomainState, &MSG) + 'static, MSG: Any,

Registers a callback closure on an activity with a specific topic to listen to. Has mutable access to the DomainState object.

By default, the activity will only receive calls when it is active. Use subscribe_domained_masked for more control over this behavior.

Make sure to use the correct signature for the function, the Rust compiler may give strange error messages otherwise. For example, the message must be borrowed by the subscription handler.

§Panics

Panics if the activity has not been registered with a domain.

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pub fn subscribe_domained_mut<F, MSG>(&self, f: F)
where F: Fn(&mut A, &mut DomainState, &mut MSG) + 'static, MSG: Any,

Same as subscribe_domained but gives mutable access to the message object.

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pub fn private_channel<F, MSG>(&self, f: F)
where F: Fn(&mut A, MSG) + 'static, MSG: Any,

Registers a callback closure on an activity with a specific topic to listen to. Messages sent with nuts::publish() are NOT received, only messages sent with nuts::send_to().

Attention! The handler takes ownership of the message. It will compile if it is borrowed instead, but then it will also expect a reference to be published. (Which usually doesn’t work due to lifetimes) Then, it will not react to normally sent messages and can be difficult to debug.

Since the listener takes ownership, it is not possible to have more than one private channel active for the same activity at the same time. If multiple private channels are added to an activity, only the last listener is retained. (Older ones are replaced and deleted)

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pub fn private_domained_channel<F, MSG>(&self, f: F)
where F: Fn(&mut A, &mut DomainState, MSG) + 'static, MSG: Any,

Variant of private_channel with access to the domain state.

§Panics

Panics if the activity has not been registered with a domain.

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pub fn private_channel_masked<F, MSG>(&self, mask: SubscriptionFilter, f: F)
where F: Fn(&mut A, MSG) + 'static, MSG: Any,

Variant of ``private_channel` with subscription mask.

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pub fn private_domained_channel_masked<F, MSG>( &self, mask: SubscriptionFilter, f: F, )
where F: Fn(&mut A, &mut DomainState, MSG) + 'static, MSG: Any,

Variant of private_channel with access to the domain state and subscription mask.

§Panics

Panics if the activity has not been registered with a domain.

Source

pub fn subscribe_masked<F, MSG>(&self, mask: SubscriptionFilter, f: F)
where F: Fn(&mut A, &MSG) + 'static, MSG: Any,

Registers a callback closure on an activity with a specific topic to listen to with filtering options.

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pub fn subscribe_masked_mut<F, MSG>(&self, mask: SubscriptionFilter, f: F)
where F: Fn(&mut A, &mut MSG) + 'static, MSG: Any,

Same as subscribe_masked but gives mutable access to the message object.

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pub fn subscribe_domained_masked<F, MSG>(&self, mask: SubscriptionFilter, f: F)
where F: Fn(&mut A, &mut DomainState, &MSG) + 'static, MSG: Any,

Registers a callback closure on an activity with a specific topic to listen to with filtering options. Has mutable access to the DomainState object.