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Core functionality for the RSocket library

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package io.rsocket.core;

import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.rsocket.DuplexConnection;
import java.nio.channels.ClosedChannelException;
import reactor.core.Disposable;
import reactor.core.publisher.Mono;
import reactor.util.function.Tuple2;
import reactor.util.function.Tuples;

abstract class ClientSetup {
  abstract Mono> init(DuplexConnection connection);
}

class DefaultClientSetup extends ClientSetup {

  @Override
  Mono> init(DuplexConnection connection) {
    return Mono.create(
        sink -> sink.onRequest(__ -> sink.success(Tuples.of(Unpooled.EMPTY_BUFFER, connection))));
  }
}

class ResumableClientSetup extends ClientSetup {

  @Override
  Mono> init(DuplexConnection connection) {
    return Mono.create(
        sink -> {
          sink.onRequest(
              __ -> {
                new SetupHandlingDuplexConnection(connection, sink);
              });

          Disposable subscribe =
              connection
                  .onClose()
                  .doFinally(__ -> sink.error(new ClosedChannelException()))
                  .subscribe();
          sink.onCancel(
              () -> {
                subscribe.dispose();
                connection.dispose();
                connection.receive().subscribe();
              });
        });
  }
}