lik/ts/lik.observablemap.ts

43 lines
1.4 KiB
TypeScript

import * as plugins from './lik.plugins'
import { Objectmap } from './lik.objectmap'
import { Stringmap } from './lik.stringmap'
import { Observable } from 'rxjs/Rx'
/**
* bundles an observable with an emitter
*/
export interface ObservableEmitterBundle {
observable: plugins.rx.Observable<any>
emitter: plugins.events.EventEmitter
event: string
}
/**
* manages observables by making sure that only one observable is regsitered per event
*/
export class Observablemap {
ObservableEmitterBundleObjectmap = new Objectmap<ObservableEmitterBundle>()
/**
* creates a new observable if not yet registered for the same event.
* In case event has been registered before the same observable is returned.
*/
getObservableForEmitterEvent(emitterArg: plugins.events.EventEmitter, eventArg: string) {
let existingBundle = this.ObservableEmitterBundleObjectmap.find((bundleArg) => {
return(bundleArg.emitter === emitterArg && bundleArg.event === eventArg)
})
if (existingBundle) {
return existingBundle.observable
} else {
let emitterObservable = plugins.rx.Observable.fromEvent(emitterArg, eventArg)
this.ObservableEmitterBundleObjectmap.add({
observable: emitterObservable,
emitter: emitterArg,
event: eventArg
})
return emitterObservable
}
}
}