public async Task <ICachedLayer> CallAsync() { string description = "Building " + layerType + " layer"; buildConfiguration.GetEventHandlers().Dispatch(LogEvent.Progress(description + "...")); using (ProgressEventDispatcher ignored = progressEventDispatcherFactory.Create("building " + layerType + " layer", 1)) using (TimerEventDispatcher ignored2 = new TimerEventDispatcher(buildConfiguration.GetEventHandlers(), description)) { LayersCache cache = buildConfiguration.GetApplicationLayersCache(); // Don't build the layer if it exists already. Maybe <CachedLayer> optionalCachedLayer = await cache.RetrieveAsync(layerConfiguration.LayerEntries).ConfigureAwait(false); if (optionalCachedLayer.IsPresent()) { return(new CachedLayerWithType(optionalCachedLayer.Get(), GetLayerType())); } IBlob layerBlob = new ReproducibleLayerBuilder(layerConfiguration.LayerEntries).Build(); CachedLayer cachedLayer = await cache.WriteUncompressedLayerAsync(layerBlob, layerConfiguration.LayerEntries).ConfigureAwait(false); buildConfiguration .GetEventHandlers() .Dispatch(LogEvent.Debug(description + " built " + cachedLayer.GetDigest())); return(new CachedLayerWithType(cachedLayer, GetLayerType())); } }