public IEnumerable <IStreamPartition> Generate(Stream stream)
{
while (true)
{
byte[] buffer = new byte[PartitionSize];
var count = stream.Read(buffer, 0, buffer.Length);
if (count <= 0)
{
break;
}
if (count < buffer.Length)
{
Array.Resize(ref buffer, count);
}
var path = TempProcessFiles.NewProcessFilePath();
File.WriteAllBytes(path, buffer);
var partition = new FilePartition(path, buffer.LongLength);
yield return(partition);
}
}
public IAsyncEnumerable <IStreamPartition> GenerateAsync(Stream stream, CancellationToken cancellationToken)
{
var helper = new AsyncEnumerableHelper <IStreamPartition>();
var arr = new byte[PartitionSize];
Action <byte[], int, int, CancellationToken> copier = (buffer, offset, count, CancellationToken) =>
{
if (offset < 0)
{
return;
}
if (count <= 0)
{
return;
}
var end = offset + count;
while (offset < end)
{
//todo: convert this to a Func<.., Task> so we can do the async without blocking.
var take = Math.Min(PartitionSize, end - offset);
if (arr.Length < take)
{
Array.Resize(ref arr, take);
}
else if (arr.Length > take)
{
arr = new byte[take];
}
Buffer.BlockCopy(buffer, offset, arr, 0, take);
var path = TempProcessFiles.NewProcessFilePath();
File.WriteAllBytes(path, arr);
var partition = new FilePartition(path, arr.LongLength);
helper.SetNext(partition);
offset += take;
}
};
var cache = new StreamWriter(
(data, offset, count) => {
Console.WriteLine($"Received partition of size {data.Length} with offset {offset} and count {count}");
copier(data, offset, count, CancellationToken.None);
},
(data, offset, count, ct) => {
Console.WriteLine($"Received ASYNC partition of size {data.Length} with offset {offset} and count {count}");
copier(data, offset, count, ct);
return(Task.CompletedTask);
},
totalSize => { Console.WriteLine("Received total length"); });
var task = stream
.CopyToAsync(cache, PartitionSize, cancellationToken)
.ContinueWith(done =>
{
Console.WriteLine("Copy To is DONE");
helper.MarkComplete();
});
return(helper.GetEnumerable());
}