@OnEvent - event handling

Handling in-instance events with channel based

Overview
SugoiJS provides a way to emit and handle events based on channels.
Usage
Listening to event
overview
Using the @OnEvent decorator we can bind the decorated method with the event.
OnEvent(event: string, once?: boolean, channel?: string)

event - Event name to bind to
once - Should listen to the event once (default: false)
channel - The channel name of the event tunnel (default: 'DEFAULT')
Example
import {OnEvent} from '@sugoi/server';
​
class EventHandler{
    CHANNEL_NAME: string = 'FIRST_CHANNEL';
    completed: boolean = false;
    
    @OnEvent('data', false, EventHandler.CHANNEL_NAME)    
    onData(data: any){
        if(this.completed){
            return;
        }
        // handle the emitted data
        processData(data);
    }
    
    @OnEvent('complete', true, EventHandler.CHANNEL_NAME)
    onComplete(){
        this.completed = true;
    }
    
}
Emit event
overview
Using the @sugoi/server EventEmitter class we can emit data based on channels
const emitter = new EventEmitter(channelName)

channel - The channel name of the event tunnel (default: 'DEFAULT')
​
Example
const emitter = new EventEmitter('FIRST_CHANNEL');
emitter.emit('event', data)
Full example
import {OnEvent, EventEmitter} from '@sugoi/server';
​
class EventHandler{
    CHANNEL_NAME: string = 'FIRST_CHANNEL';
    completed: boolean = false;
    emitter: EventEmitter = new EventEmitter(EventHandler.CHANNEL_NAME);   
    
    @OnEvent('data', false, EventHandler.CHANNEL_NAME)    
    onData(data: any){
        if(this.completed){
            return;
        }
        // handle the emitted data
        processData(data);
    }
    
    @OnEvent('complete', true, EventHandler.CHANNEL_NAME)
    onComplete(){
        this.completed = true;
    }
    
    emit(event: string, ...data?: any){
        this.emitter.emit(event, ...data);
    }
    
}

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Run time decorate ( + JS support)

Last modified 3yr ago

@OnEvent - event handling

Overview

Usage

Listening to event

overview

Example

Emit event

overview

​

Example

Full example