| import { Action } from './Action'; |
| export class AsyncAction extends Action { |
| constructor(scheduler, work) { |
| super(scheduler, work); |
| this.scheduler = scheduler; |
| this.work = work; |
| this.pending = false; |
| } |
| schedule(state, delay = 0) { |
| if (this.closed) { |
| return this; |
| } |
| this.state = state; |
| const id = this.id; |
| const scheduler = this.scheduler; |
| if (id != null) { |
| this.id = this.recycleAsyncId(scheduler, id, delay); |
| } |
| this.pending = true; |
| this.delay = delay; |
| this.id = this.id || this.requestAsyncId(scheduler, this.id, delay); |
| return this; |
| } |
| requestAsyncId(scheduler, id, delay = 0) { |
| return setInterval(scheduler.flush.bind(scheduler, this), delay); |
| } |
| recycleAsyncId(scheduler, id, delay = 0) { |
| if (delay !== null && this.delay === delay && this.pending === false) { |
| return id; |
| } |
| clearInterval(id); |
| return undefined; |
| } |
| execute(state, delay) { |
| if (this.closed) { |
| return new Error('executing a cancelled action'); |
| } |
| this.pending = false; |
| const error = this._execute(state, delay); |
| if (error) { |
| return error; |
| } |
| else if (this.pending === false && this.id != null) { |
| this.id = this.recycleAsyncId(this.scheduler, this.id, null); |
| } |
| } |
| _execute(state, delay) { |
| let errored = false; |
| let errorValue = undefined; |
| try { |
| this.work(state); |
| } |
| catch (e) { |
| errored = true; |
| errorValue = !!e && e || new Error(e); |
| } |
| if (errored) { |
| this.unsubscribe(); |
| return errorValue; |
| } |
| } |
| _unsubscribe() { |
| const id = this.id; |
| const scheduler = this.scheduler; |
| const actions = scheduler.actions; |
| const index = actions.indexOf(this); |
| this.work = null; |
| this.state = null; |
| this.pending = false; |
| this.scheduler = null; |
| if (index !== -1) { |
| actions.splice(index, 1); |
| } |
| if (id != null) { |
| this.id = this.recycleAsyncId(scheduler, id, null); |
| } |
| this.delay = null; |
| } |
| } |
| //# sourceMappingURL=AsyncAction.js.map |