Esempio n. 1
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 /// <summary>
 /// Creates a <see cref="Source{TOut,TMat}"/> from an <see cref="Stream"/> created by the given function.
 /// Emitted elements are <paramref name="chunkSize"/> sized <see cref="ByteString"/> elements,
 /// except the final element, which will be up to <paramref name="chunkSize"/> in size.
 /// 
 /// You can configure the default dispatcher for this Source by changing the "akka.stream.blocking-io-dispatcher" or
 /// set it for a given Source by using <see cref="ActorAttributes.CreateDispatcher"/>.
 /// 
 /// It materializes a <see cref="Task{TResult}"/> of <see cref="IOResult"/> containing the number of bytes read from the source file upon completion,
 /// and a possible exception if IO operation was not completed successfully.
 /// 
 /// The created <see cref="Stream"/> will be closed when the <see cref="Source{TOut,TMat}"/> is cancelled.
 /// </summary>
 /// <param name="createInputStream">A function which creates the <see cref="Stream"/> to read from</param>
 /// <param name="chunkSize">The size of each read operation, defaults to 8192</param>
 public static Source<ByteString, Task<IOResult>> FromInputStream(Func<Stream> createInputStream, int chunkSize = 8192)
 {
     var shape = new SourceShape<ByteString>(new Outlet<ByteString>("InputStreamSource"));
     var streamSource = new InputStreamSource(createInputStream, chunkSize, DefaultAttributes.InputStreamSource,
         shape);
     return new Source<ByteString, Task<IOResult>>(streamSource);
 }