Offer a way to create and return OutputStreams

Right now it looks like the SDK only accepts input streams which results in extra boilerplate in application code looking to write data by streaming it rather than holding it in memory.

The Azure blob storage APIs offer something along these lines via a method called blobOutputStream. Basically all metadata is prepared up front and then a method is called to return a stream.

That stream can then be passed back to the caller.

[lnnwvr]

Here we go… something like

import java.io.IOException;
import java.io.OutputStream;
import java.util.concurrent.Future;

public class S3FutureOutputStream extends OutputStream {

  private final OutputStream wrapped;
  private final Future<?> future;

  public S3FutureOutputStream(OutputStream outputStream, Future<?> future) {
    wrapped = outputStream;
    this.future = future;
  }

  @Override
  public void write(int b) throws IOException {
    wrapped.write(b);
  }

  @Override
  public void write(byte[] b) throws IOException {
    wrapped.write(b);
  }

  @Override
  public void write(byte[] b, int off, int len) throws IOException {
    wrapped.write(b, off, len);
  }

  @Override
  public void flush() throws IOException {
    wrapped.flush();
  }

  @Override
  public void close() throws IOException {
    wrapped.close();
    try {
      future.get();
    } catch (Exception e) {
      throw new RuntimeException(e);
    }
  }
}

[balamurugana]

Thanks. We will check the possibility.