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An Ember helper to project a promise into a stream of POJO states
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| import Ember from 'ember'; | |
| export default Ember.Helper.extend({ | |
| compute([promise]) { | |
| if (this.promise !== promise) { | |
| this.promiseState = new PromiseState(); | |
| this.promise = promise; | |
| this.promise.then((result)=> { | |
| this.promiseState = this.promiseState.resolve(result); | |
| this.recompute(); | |
| }).catch((reason)=> { | |
| this.promiseState = this.promiseState.reject(reason); | |
| this.recompute(); | |
| }); | |
| } | |
| return this.promiseState; | |
| } | |
| }); | |
| class PromiseState { | |
| constructor(attrs = {isResolved: false, isRejected: false}) { | |
| Object.assign(this, attrs); | |
| } | |
| get isPending() { | |
| return this.isResolved === false && this.isRejected === false; | |
| } | |
| get isSettled() { | |
| return !this.isPending; | |
| } | |
| resolve(result) { | |
| return new PromiseState({ | |
| isResolved: true, | |
| isRejected: false, | |
| result: result | |
| }); | |
| } | |
| reject(reason) { | |
| return new PromiseState({ | |
| isResolved: false, | |
| isRejected: true, | |
| reason: reason | |
| }); | |
| } | |
| } |
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