45 lines
1.7 KiB
TypeScript
45 lines
1.7 KiB
TypeScript
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import {Injectable} from 'angular2/di';
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import {MessageBus} from 'angular2/src/web-workers/shared/message_bus';
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import {Serializer} from 'angular2/src/web-workers/shared/serializer';
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import {EventEmitter, ObservableWrapper, PromiseWrapper, Promise} from 'angular2/src/facade/async';
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import {XHR_CHANNEL} from 'angular2/src/web-workers/shared/messaging_api';
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import {ReceivedMessage} from 'angular2/src/web-workers/ui/impl';
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import {BaseException, Type} from 'angular2/src/facade/lang';
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import {XHR} from 'angular2/src/render/xhr';
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// TODO(jteplitz602): Create parent UIComponent class #3703
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@Injectable()
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export class MessageBasedXHRImpl {
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private _sink: EventEmitter;
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private _source: EventEmitter;
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constructor(bus: MessageBus, private _serializer: Serializer, private _xhr: XHR) {
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this._sink = bus.to(XHR_CHANNEL);
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this._source = bus.from(XHR_CHANNEL);
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ObservableWrapper.subscribe(this._source,
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(message: StringMap<string, any>) => this._handleMessage(message));
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}
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private _handleMessage(map: StringMap<string, any>) {
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var message = new ReceivedMessage(map);
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var args = message.args;
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switch (message.method) {
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case "get":
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var url = args[0];
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var promise = this._xhr.get(url);
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this._wrapWebWorkerPromise(message.id, promise, String);
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break;
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default:
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throw new BaseException(message.method + " Not Implemented");
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}
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}
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private _wrapWebWorkerPromise(id: string, promise: Promise<any>, type: Type): void {
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PromiseWrapper.then(promise, (result: any) => {
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ObservableWrapper.callNext(
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this._sink,
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{'type': 'result', 'value': this._serializer.serialize(result, type), 'id': id});
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});
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}
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}
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