/// <summary>
/// Sets and optionally compresses the data for the <see cref="IDataObject"/>.
/// </summary>
/// <param name="dataObject">The data object.</param>
/// <param name="data">The data.</param>
/// <param name="compressionMethod">The compression method to use if any.</param>
/// <returns>The data object with the data set.</returns>
public static IDataObject SetData(this IDataObject dataObject, byte[] data, string compressionMethod = EtpCompression.None)
{
var encoding = string.Empty;
if (EtpCompression.RequiresCompression(compressionMethod) && data?.Length > 0)
{
if (!EtpCompression.CanCompress(compressionMethod))
{
throw new NotSupportedException($"Compression method not supported: {compressionMethod}");
}
using (var compressed = new MemoryStream())
{
using (var uncompressed = new MemoryStream(data))
using (var compressionStream = EtpCompression.TryGetCompresionStream(compressionMethod, compressed))
{
uncompressed.CopyTo(compressionStream);
}
data = compressed.ToArray();
encoding = compressionMethod;
}
}
dataObject.ContentEncoding = encoding;
dataObject.Data = data ?? new byte[0];
return(dataObject);
}
/// <summary>
/// Encodes the specified message.
/// </summary>
/// <typeparam name="T">The type of the message body.</typeparam>
/// <param name="message">The message.</param>
/// <param name="asBinary">Whether or not to encode as binary.</param>
/// <param name="includeExtension">Whether or not to include a message header extension.</param>
/// <param name="compression">The compression type.</param>
/// <returns>The encoded byte array containing the message data.</returns>
public static byte[] Encode <T>(this EtpMessage <T> message, bool asBinary = true, bool includeExtension = false, string compression = EtpCompression.None) where T : IEtpMessageBody
{
using (var stream = new MemoryStream())
using (var compressionStream = message.Header.CanBeCompressed() ? EtpCompression.TryGetCompresionStream(compression, stream) : null)
{
// create avro binary encoder to write to memory stream
var headerEncoder = asBinary ? (IAvroEncoder) new BinaryAvroEncoder(stream) : new JsonAvroEncoder(stream);
var bodyEncoder = headerEncoder;
if (compressionStream != null)
{
// add Compressed flag to message flags before writing header
message.Header.SetCompressed();
bodyEncoder = asBinary ? (IAvroEncoder) new BinaryAvroEncoder(compressionStream) : new JsonAvroEncoder(compressionStream);
}
// serialize header
message.Header.Encode(headerEncoder);
// serialize header extension
if (message.Extension != null && includeExtension)
{
message.Extension.Encode(bodyEncoder); // Use body encoder to handle compression
}
message.Body.Encode(bodyEncoder);
if (compressionStream != null)
{
compressionStream.Close();
}
return(stream.ToArray());
}
}
/// <summary>
/// Gets the data contained by the <see cref="IDataObject"/> and decompresses the byte array, if necessary.
/// </summary>
/// <param name="dataObject">The data object.</param>
/// <returns>The decompressed data as a byte array.</returns>
public static byte[] GetData(this IDataObject dataObject)
{
if (!EtpCompression.RequiresDecompression(dataObject.ContentEncoding) || dataObject.Data?.Length == 0)
{
return(dataObject.Data);
}
if (!EtpCompression.CanDecompress(dataObject.ContentEncoding))
{
throw new NotSupportedException($"Content encoding not supported: {dataObject.ContentEncoding}");
}
using (var uncompressed = new MemoryStream())
{
using (var compressed = new MemoryStream(dataObject.Data))
using (var decompressionStream = EtpCompression.TryGetDecompresionStream(dataObject.ContentEncoding, compressed))
{
decompressionStream.CopyTo(uncompressed);
}
return(uncompressed.ToArray());
}
}