netty/src/main/java/com/google/net/stubby/transport/netty/NettyClientStream.java

/*
 * Copyright 2014, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package com.google.net.stubby.transport.netty;

import static com.google.common.base.Preconditions.checkNotNull;

import com.google.net.stubby.transport.ClientStreamListener;
import com.google.net.stubby.transport.Http2ClientStream;

import io.netty.buffer.ByteBuf;
import io.netty.channel.Channel;
import io.netty.handler.codec.http2.Http2Headers;

import java.nio.ByteBuffer;

/**
 * Client stream for a Netty transport.
 */
class NettyClientStream extends Http2ClientStream {

  private final Channel channel;
  private final NettyClientHandler handler;

  NettyClientStream(ClientStreamListener listener, Channel channel, NettyClientHandler handler) {
    super(listener, channel.eventLoop());
    this.channel = checkNotNull(channel, "channel");
    this.handler = checkNotNull(handler, "handler");
  }

  void transportHeadersReceived(Http2Headers headers, boolean endOfStream) {
    if (endOfStream) {
      transportTrailersReceived(Utils.convertTrailers(headers));
    } else {
      transportHeadersReceived(Utils.convertHeaders(headers));
    }
  }

  void transportDataReceived(ByteBuf frame, boolean endOfStream) {
    transportDataReceived(new NettyBuffer(frame.retain()), endOfStream);
  }

  @Override
  protected void sendCancel() {
    // Send the cancel command to the handler.
    channel.writeAndFlush(new CancelStreamCommand(this));
  }

  @Override
  protected void sendFrame(ByteBuffer frame, boolean endOfStream) {
    SendGrpcFrameCommand cmd = new SendGrpcFrameCommand(id(), 
        Utils.toByteBuf(channel.alloc(), frame), endOfStream);
    channel.writeAndFlush(cmd);
  }

  @Override
  protected void returnProcessedBytes(int processedBytes) {
    handler.returnProcessedBytes(id(), processedBytes);
  }
}