rukus-signal

signalling for rukus apps

Usage:

In your rukus app's index.js, create a signals instance on your App object:

var Signal = require('rukus-signal');
RukusApp.signals = new Signal(RukusApp, riot);

You can then use RukusApp.signals to connect views to things like a store:

A simple todo store which emits an updated signal and accepts a new todo.

function TodoStore() {
    RukusApp.signals.init(this);

    this.todos = [];

    this.emits({   
        signal : 'updated',
        desc : `signaled when the TodoStore has changed, observers should watch
                for this event if they are interested in TodoStore updates.`,
        data : 'null'
        });

    this.accepts({ 
        signal : 'new',
        desc : 'adds a new Todo to the store',
        data : 'A Todo object',
        func : (todo) => {
            this.todos.push(todo);
            this.emit('updated');
        }});
};

RukusApp.todoStore = new TodoStore();

A component which renders and adds todos:

module.exports = function(opts) {
    RukusApp.signals.init(this);

    this.binds({ 'todoStore:updated' : this.update });
    this.invokes({'new' : 'todoStore:new'});

    this.add = () => {
        this.invoke('new', { todo : this.todo.value });
    };
};

API

Signal.init(this)

Initialises an object or component handler to use rukus signals.

Signal.doc() -> JSON

Returns a JSON structure which documents every controller and component which have registered with this rukus singnal instance, and who communicates with who.

this.accepts(sig1, sig2, ...)

Takes one or more signal definitions, stating that this object accepts these signals and acts on them. signal definitions must be in the format:

{ 
    signal : 'signalName',
    desc : `a description of what this signal does.`,
    data : `a description of the data it requires.`,
    func : [Function] // which will be called if this signal is recieved.
}

this.binds(signals)

Takes an object of signal paths to functions and binds them to this object.

A signal path is a string in the format of:

'dotted.path.to.object.under.RukusApp:signalName' 

Eg:

{ 'todoStore:updated', this.update }

In the event that the todoStore signals updated, call this.update.

this.emits(sig1, sig2, ...)

Takes one or more signal definitions, stating that this object emits these signals. signal definitions must be in the format:

{ 
    signal : 'signalName',
    desc : `a description of what this signal means.`,
    data : `a description of the data it sends.`,
}

this.emit(signalName, data)

Emit a signal by name as defined by this.emits. Optionally emit data.

this.invokes(signals)

Takes an object of local name to signal paths on other objects, indicating that this object intends to invoke their signals.

{ 'newTodo' : 'todoStore:updated', ... }

This object may now invoke 'newTodo'.

this.invoke(signalName, data)

Invoke a signal by name, as defined via this.invokes.