public async Task <bool> WriteNextAsync(OperationData operationData)
{
if (this.isDisposed)
{
throw new FabricObjectClosedException();
}
if (operationData == null)
{
throw new ArgumentNullException("operationData");
}
if (operationData.Count != 1)
{
throw new ArgumentException(string.Format("Unexpected operationData count: {0}", operationData.Count));
}
ArraySegment <byte> dataSegment;
using (var enumerator = operationData.GetEnumerator())
{
bool res = enumerator.MoveNext();
if (!res)
{
throw new InvalidDataException("operationData enumeration is empty");
}
dataSegment = enumerator.Current;
}
if (dataSegment.Count <= 0)
{
throw new ArgumentException("Empty operationData data segment.");
}
// the first chunk should contain only metadata (the version), so at least one chunk will follow
if (this.isFirstChunk)
{
this.isFirstChunk = false;
await this.fileStream.WriteAsync(dataSegment.Array, dataSegment.Offset, dataSegment.Count).ConfigureAwait(false);
return(false);
}
// subsequent chunks should be checkpoint frames
return(await CheckpointFileHelper.WriteFrameAsync(dataSegment, this.fileStream, this.traceType).ConfigureAwait(false));
// todo: trace
}
public MetadataOperationData(OperationData operationData)
{
if (operationData == null)
{
throw new ArgumentNullException("operationData");
}
if (operationData.Count != 1)
{
throw new InvalidDataException(string.Format("Unexpected operationData count: {0}", operationData.Count));
}
ArraySegment <byte> dataSegment;
using (var enumerator = operationData.GetEnumerator())
{
bool res = enumerator.MoveNext();
if (!res)
{
throw new InvalidDataException("operationData enumeration is empty");
}
dataSegment = enumerator.Current;
}
if (dataSegment.Count <= 0)
{
throw new InvalidDataException("Empty operationData data segment.");
}
// Array segment zero contains the metadata
var metadataBytes = operationData[0];
if (metadataBytes.Count < SerializedMetadataSize)
{
throw new InvalidDataException(string.Format("Unexpected metadata length: {0}", metadataBytes.Count));
}
using (var stream = new MemoryStream(metadataBytes.Array, metadataBytes.Offset, metadataBytes.Count))
using (var reader = new BinaryReader(stream, Encoding.UTF8))
{
// Read version.
var versionRead = reader.ReadInt16();
// Check version.
if (versionRead != Constants.SerializedVersion)
{
throw new InvalidDataException(
string.Format("Version mismatch. Expected version {0}, but read version {1}", Constants.SerializedVersion, versionRead));
}
// Read operation type.
var operationType = (OperationType)reader.ReadByte();
if (operationType == OperationType.Invalid)
{
throw new InvalidDataException("Invalid operationType.");
}
// Read item id.
var itemId = reader.ReadInt64();
this.Version = versionRead;
this.OperationType = operationType;
this.ItemId = itemId;
}
}
