public void WriteData <TInternal>(string name, DateTime start, DateTime end, uint dataCount, IEnumerable <PersistedDataSource> sources, KeyedDataStore <TInternal> data) where TInternal : class, IInternalData, new() { var header = new PersistedDataHeader(name, start, end, PersistedDataProtocol.GetPersistedTypeCodeFromType(typeof(TInternal)), sources, this.dimensionSet, dataCount); this.WriteDataWithLengthAndCRC32(ms => { header.Write(new BufferWriter(ms)); }, header.SerializedSize, true); // The raw data does not compress particularly well. There is some overlap in the keys, but particularly // for histograms they come pre-compressed. We also use VLE heavily in KeyedDataStore.Serialize which // makes for pretty compact data. this.WriteDataWithLengthAndCRC32(data.Serialize, data.SerializedSize, false); // We can now determine what our block length really is and back-fill our data. var currentPosition = this.sourceStream.Position; var blockLength = this.sourceStream.Position - this.blockStartOffset; this.sourceStream.Position = this.blockLengthOffset; this.sourceStreamWriter.WriteUInt64((ulong)blockLength); this.sourceStream.Position = currentPosition; }
private async Task <bool> QuerySources(IList <PersistedDataSource> sources) { Events.Write.BeginQuerySources(sources); var success = false; var transferRequest = new TransferRequest { DataType = PersistedDataProtocol.GetPersistedTypeCodeFromType(typeof(TInternal)), Timeout = (this.Timeout.Seconds * 9) / 10, // 90% of timeout goes to the child MaxFanout = this.MaxFanout, Sources = new List <string>() }; foreach (var source in sources) { source.Status = PersistedDataSourceStatus.Unknown; transferRequest.Sources.Add(source.Name); } var serverOffset = this.randomNumberGenerator.Next(sources.Count); var selectedSource = sources[serverOffset]; var request = new HttpRequestMessage(HttpMethod.Post, this.CreateRequestUri(selectedSource.Name)); using (var ms = (this.memoryStreamManager.GetStream())) using (var writeStream = new WriterStream(ms, this.memoryStreamManager)) { var writer = writeStream.CreateCompactBinaryWriter(); writer.Write(transferRequest); request.Content = new ByteArrayContent(ms.ToArray()); } try { Events.Write.BeginSendSourceQuery(selectedSource, request.RequestUri); var response = await this.httpClient.SendAsync(request, HttpCompletionOption.ResponseHeadersRead); Events.Write.EndSendSourceQuery(selectedSource, (int)response.StatusCode, response.ReasonPhrase); if (!response.IsSuccessStatusCode) { switch (response.StatusCode) { case HttpStatusCode.NotFound: foreach (var source in sources) { source.Status = PersistedDataSourceStatus.Unavailable; } return(true); default: return(false); } } Events.Write.BeginReceiveSourceResponseBody(selectedSource); var length = response.Content.Headers.ContentLength ?? 0; using (var dataStream = this.memoryStreamManager.GetStream("PersistedDataAggregator/Http/Read", (int)length, true)) using (var responseStream = await response.Content.ReadAsStreamAsync()) { responseStream.CopyTo(dataStream); dataStream.Position = 0; using (var dataReader = new PersistedDataReader(dataStream, this.memoryStreamManager, this.DimensionSet)) { Events.Write.EndReceiveSourceResponseBody(selectedSource, (int)dataStream.Length); success = true; if (dataStream.Length == 0) { Events.Write.EmptyResponseReceivedFromSource(selectedSource); // Over the line. Mark it zero. Or just available, but empty (which is okay!) foreach (var source in sources) { source.Status = PersistedDataSourceStatus.Available; } } else { try { this.UnpackResponse(dataReader); } catch (PersistedDataException ex) { Events.Write.PersistedDataExceptionFromSource(selectedSource, ex); success = false; } } } } } catch (OperationCanceledException) { } catch (Exception ex) { if (ex is HttpRequestException || ex is IOException || ex is WebException || ex is ObjectDisposedException) { Events.Write.HttpExceptionFromSource(selectedSource, ex); } else { throw; } } Events.Write.EndQuerySources(success, sources); return(success); }