Method sample

packages/benchpress/src/runner.ts:37–100

({
    id,
    execute,
    prepare,
    microMetrics,
    providers,
    userMetrics,
  }: {
    id: string;
    execute?: Function;
    prepare?: Function;
    microMetrics?: {[key: string]: string};
    providers?: StaticProvider[];
    userMetrics?: {[key: string]: string};
  })

  constructor(private _defaultProviders: StaticProvider[] = []) {}

  sample({
    id,
    execute,
    prepare,
    microMetrics,
    providers,
    userMetrics,
  }: {
    id: string;
    execute?: Function;
    prepare?: Function;
    microMetrics?: {[key: string]: string};
    providers?: StaticProvider[];
    userMetrics?: {[key: string]: string};
  }): Promise<SampleState> {
    const sampleProviders: StaticProvider[] = [
      _DEFAULT_PROVIDERS,
      this._defaultProviders,
      {provide: Options.SAMPLE_ID, useValue: id},
      {provide: Options.EXECUTE, useValue: execute},
    ];
    if (prepare != null) {
      sampleProviders.push({provide: Options.PREPARE, useValue: prepare});
    }
    if (microMetrics != null) {
      sampleProviders.push({provide: Options.MICRO_METRICS, useValue: microMetrics});
    }
    if (userMetrics != null) {
      sampleProviders.push({provide: Options.USER_METRICS, useValue: userMetrics});
    }
    if (providers != null) {
      sampleProviders.push(providers);
    }

    const inj = Injector.create({providers: sampleProviders});
    const adapter: WebDriverAdapter = inj.get(WebDriverAdapter);

    return Promise.all([
      adapter.capabilities(),
      adapter.executeScript('return window.navigator.userAgent;'),
    ]).then((args) => {
      const capabilities = args[0];
      const userAgent = args[1];

      // This might still create instances twice. We are creating a new injector with all the
      // providers.
      // Only WebDriverAdapter is reused.
      // TODO(vsavkin): consider changing it when toAsyncFactory is added back or when child
      // injectors are handled better.
      const injector = Injector.create({
        providers: [
          sampleProviders,
          {provide: Options.CAPABILITIES, useValue: capabilities},
          {provide: Options.USER_AGENT, useValue: userAgent},
          {provide: WebDriverAdapter, useValue: adapter},
        ],
      });