public AppendRequestDescriptor(Stream data, StreamMetadata metadata, CancellationToken token)
{
Data = data.ThrowIfNull(nameof(data));
Metadata = metadata.ThrowIfNull(nameof(metadata));
Token = token.ThrowIfNull(nameof(token));
TaskSource = new TaskCompletionSource <object>();
}
/// <summary>
/// Searches given metatdata in block and inserts at desired position if not found
/// </summary>
/// <param name="data">The <see cref="StreamMetadata"/> object to be added</param>
public void Add(StreamMetadata data)
{
data.ThrowIfNull(nameof(data));
var index = payload.BinarySearch(data);
if (index >= 0)
{
throw new ArgumentException(nameof(data.Key));
}
index = ~index;
payload.Insert(index, data);
}
/// <summary>
/// Adds metadata of written stream to index file
/// </summary>
/// <param name="streamMetadata">stream metadata to be added to index</param>
/// <exception cref="System.ArgumentException">An element with the same key already exists</exception>
public void Set(StreamMetadata streamMetadata)
{
streamMetadata.ThrowIfNull(nameof(streamMetadata));
var key = streamMetadata.Key;
if (Contains(key))
{
throw new ArgumentException(nameof(key));
}
var blockInfo = header.Get(key);
var block = new IndexBlock();
var oldLength = 0;
if (blockInfo.Offset > 0)
{
if (blockInfo.Length + streamMetadata.SerializedLength < MaxIndexBlockLength)
{
blockProvider.Read(block, blockInfo.Offset, blockInfo.Length);
oldLength = blockInfo.Length;
}
else
{
block = new IndexBlock(blockInfo);
}
}
block.Add(streamMetadata);
var offset = blockProvider.Write(block);
var length = block.SerializedLength;
blockInfo = new BlockInfo()
{
Offset = offset, Length = length
};
header.Set(key, blockInfo);
header.IndexWrittenLength += length - oldLength;
header.StorageWrittenLength += streamMetadata.Length;
}