@Override
public void initChannel(SocketChannel ch) throws Exception {
    final Http2Connection connection = new DefaultHttp2Connection(false);
    final Http2FrameWriter frameWriter = frameWriter();
    connectionHandler = new HttpToHttp2ConnectionHandler(connection,
            frameReader(),
            frameWriter,
            new DelegatingDecompressorFrameListener(connection,
                    new InboundHttp2ToHttpAdapter.Builder(connection)
                            .maxContentLength(maxContentLength)
                            .propagateSettings(true)
                            .build()));
    responseHandler = new HttpResponseHandler();
    settingsHandler = new Http2SettingsHandler(ch.newPromise());
    configureClearText(ch);
}
 

static NettyClientHandler newHandler(
    ClientTransportLifecycleManager lifecycleManager,
    @Nullable KeepAliveManager keepAliveManager,
    int flowControlWindow,
    int maxHeaderListSize,
    Supplier<Stopwatch> stopwatchFactory,
    Runnable tooManyPingsRunnable,
    TransportTracer transportTracer,
    Attributes eagAttributes,
    String authority) {
  Preconditions.checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be positive");
  Http2HeadersDecoder headersDecoder = new GrpcHttp2ClientHeadersDecoder(maxHeaderListSize);
  Http2FrameReader frameReader = new DefaultHttp2FrameReader(headersDecoder);
  Http2FrameWriter frameWriter = new DefaultHttp2FrameWriter();
  Http2Connection connection = new DefaultHttp2Connection(false);
  WeightedFairQueueByteDistributor dist = new WeightedFairQueueByteDistributor(connection);
  dist.allocationQuantum(16 * 1024); // Make benchmarks fast again.
  DefaultHttp2RemoteFlowController controller =
      new DefaultHttp2RemoteFlowController(connection, dist);
  connection.remote().flowController(controller);

  return newHandler(
      connection,
      frameReader,
      frameWriter,
      lifecycleManager,
      keepAliveManager,
      flowControlWindow,
      maxHeaderListSize,
      stopwatchFactory,
      tooManyPingsRunnable,
      transportTracer,
      eagAttributes,
      authority);
}
 

/**
 * Must be called by subclasses to initialize the handler and channel.
 */
protected final void initChannel(Http2HeadersDecoder headersDecoder) throws Exception {
  content = Unpooled.copiedBuffer("hello world", UTF_8);
  frameWriter = mock(Http2FrameWriter.class, delegatesTo(new DefaultHttp2FrameWriter()));
  frameReader = new DefaultHttp2FrameReader(headersDecoder);

  channel = new FakeClockSupportedChanel();
  handler = newHandler();
  channel.pipeline().addLast(handler);
  ctx = channel.pipeline().context(handler);

  writeQueue = initWriteQueue();
}
 

private CapturingGrpcHttp2ConnectionHandler capturingGrpcHandler() {
  // Netty Boilerplate.  We don't really need any of this, but there is a tight coupling
  // between a Http2ConnectionHandler and its dependencies.
  Http2Connection connection = new DefaultHttp2Connection(true);
  Http2FrameWriter frameWriter = new DefaultHttp2FrameWriter();
  Http2FrameReader frameReader = new DefaultHttp2FrameReader(false);
  DefaultHttp2ConnectionEncoder encoder =
      new DefaultHttp2ConnectionEncoder(connection, frameWriter);
  DefaultHttp2ConnectionDecoder decoder =
      new DefaultHttp2ConnectionDecoder(connection, encoder, frameReader);

  return new CapturingGrpcHttp2ConnectionHandler(decoder, encoder, new Http2Settings());
}
 

private Http2FrameWriter frameWriter() {
    // Set initial SETTINGS
    Http2Settings settings = new Http2Settings();
    settings.pushEnabled(false);
    settings.maxConcurrentStreams(100);

    return new Http2OutboundFrameLogger(new CustomHttp2FrameWriter(settings), logger);
}
 

Http2ClientKeepAliveHandler(Channel channel, Http2FrameWriter frameWriter, Timer keepAliveTimer,
                            long idleTimeoutMillis, long pingIntervalMillis) {

    // TODO(ikhoon): Should set maxConnectionAgeMillis by https://github.com/line/armeria/pull/2741
    super(channel, frameWriter, "client", keepAliveTimer,
          idleTimeoutMillis, pingIntervalMillis, /* maxConnectionAgeMillis */ 0);
}
 

protected Http2KeepAliveHandler(Channel channel, Http2FrameWriter frameWriter, String name,
                                Timer keepAliveTimer, long idleTimeoutMillis, long pingIntervalMillis,
                                long maxConnectionAgeMillis) {
    super(channel, name, keepAliveTimer, idleTimeoutMillis, pingIntervalMillis, maxConnectionAgeMillis);
    this.channel = requireNonNull(channel, "channel");
    this.frameWriter = requireNonNull(frameWriter, "frameWriter");
}
 

static NettyClientHandler newHandler(
    ClientTransportLifecycleManager lifecycleManager,
    @Nullable KeepAliveManager keepAliveManager,
    boolean autoFlowControl,
    int flowControlWindow,
    int maxHeaderListSize,
    Supplier<Stopwatch> stopwatchFactory,
    Runnable tooManyPingsRunnable,
    TransportTracer transportTracer,
    Attributes eagAttributes,
    String authority) {
  Preconditions.checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be positive");
  Http2HeadersDecoder headersDecoder = new GrpcHttp2ClientHeadersDecoder(maxHeaderListSize);
  Http2FrameReader frameReader = new DefaultHttp2FrameReader(headersDecoder);
  Http2FrameWriter frameWriter = new DefaultHttp2FrameWriter();
  Http2Connection connection = new DefaultHttp2Connection(false);
  WeightedFairQueueByteDistributor dist = new WeightedFairQueueByteDistributor(connection);
  dist.allocationQuantum(16 * 1024); // Make benchmarks fast again.
  DefaultHttp2RemoteFlowController controller =
      new DefaultHttp2RemoteFlowController(connection, dist);
  connection.remote().flowController(controller);

  return newHandler(
      connection,
      frameReader,
      frameWriter,
      lifecycleManager,
      keepAliveManager,
      autoFlowControl,
      flowControlWindow,
      maxHeaderListSize,
      stopwatchFactory,
      tooManyPingsRunnable,
      transportTracer,
      eagAttributes,
      authority);
}
 

/**
 * Must be called by subclasses to initialize the handler and channel.
 */
protected final void initChannel(Http2HeadersDecoder headersDecoder) throws Exception {
  content = Unpooled.copiedBuffer("hello world", UTF_8);
  frameWriter = mock(Http2FrameWriter.class, delegatesTo(new DefaultHttp2FrameWriter()));
  frameReader = new DefaultHttp2FrameReader(headersDecoder);

  channel = new FakeClockSupportedChanel();
  handler = newHandler();
  channel.pipeline().addLast(handler);
  ctx = channel.pipeline().context(handler);

  writeQueue = initWriteQueue();
}
 

private CapturingGrpcHttp2ConnectionHandler capturingGrpcHandler() {
  // Netty Boilerplate.  We don't really need any of this, but there is a tight coupling
  // between an Http2ConnectionHandler and its dependencies.
  Http2Connection connection = new DefaultHttp2Connection(true);
  Http2FrameWriter frameWriter = new DefaultHttp2FrameWriter();
  Http2FrameReader frameReader = new DefaultHttp2FrameReader(false);
  DefaultHttp2ConnectionEncoder encoder =
      new DefaultHttp2ConnectionEncoder(connection, frameWriter);
  DefaultHttp2ConnectionDecoder decoder =
      new DefaultHttp2ConnectionDecoder(connection, encoder, frameReader);

  return new CapturingGrpcHttp2ConnectionHandler(decoder, encoder, new Http2Settings());
}
 

static NettyServerHandler newHandler(
    ServerTransportListener transportListener,
    ChannelPromise channelUnused,
    List<ServerStreamTracer.Factory> streamTracerFactories,
    TransportTracer transportTracer,
    int maxStreams,
    int flowControlWindow,
    int maxHeaderListSize,
    int maxMessageSize,
    long keepAliveTimeInNanos,
    long keepAliveTimeoutInNanos,
    long maxConnectionIdleInNanos,
    long maxConnectionAgeInNanos,
    long maxConnectionAgeGraceInNanos,
    boolean permitKeepAliveWithoutCalls,
    long permitKeepAliveTimeInNanos) {
  Preconditions.checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be positive");
  Http2FrameLogger frameLogger = new Http2FrameLogger(LogLevel.DEBUG, NettyServerHandler.class);
  Http2HeadersDecoder headersDecoder = new GrpcHttp2ServerHeadersDecoder(maxHeaderListSize);
  Http2FrameReader frameReader = new Http2InboundFrameLogger(
      new DefaultHttp2FrameReader(headersDecoder), frameLogger);
  Http2FrameWriter frameWriter =
      new Http2OutboundFrameLogger(new DefaultHttp2FrameWriter(), frameLogger);
  return newHandler(
      channelUnused,
      frameReader,
      frameWriter,
      transportListener,
      streamTracerFactories,
      transportTracer,
      maxStreams,
      flowControlWindow,
      maxHeaderListSize,
      maxMessageSize,
      keepAliveTimeInNanos,
      keepAliveTimeoutInNanos,
      maxConnectionIdleInNanos,
      maxConnectionAgeInNanos,
      maxConnectionAgeGraceInNanos,
      permitKeepAliveWithoutCalls,
      permitKeepAliveTimeInNanos);
}
 

@VisibleForTesting
static NettyServerHandler newHandler(
    ChannelPromise channelUnused,
    Http2FrameReader frameReader,
    Http2FrameWriter frameWriter,
    ServerTransportListener transportListener,
    List<ServerStreamTracer.Factory> streamTracerFactories,
    TransportTracer transportTracer,
    int maxStreams,
    int flowControlWindow,
    int maxHeaderListSize,
    int maxMessageSize,
    long keepAliveTimeInNanos,
    long keepAliveTimeoutInNanos,
    long maxConnectionIdleInNanos,
    long maxConnectionAgeInNanos,
    long maxConnectionAgeGraceInNanos,
    boolean permitKeepAliveWithoutCalls,
    long permitKeepAliveTimeInNanos) {
  Preconditions.checkArgument(maxStreams > 0, "maxStreams must be positive");
  Preconditions.checkArgument(flowControlWindow > 0, "flowControlWindow must be positive");
  Preconditions.checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be positive");
  Preconditions.checkArgument(maxMessageSize > 0, "maxMessageSize must be positive");

  final Http2Connection connection = new DefaultHttp2Connection(true);
  WeightedFairQueueByteDistributor dist = new WeightedFairQueueByteDistributor(connection);
  dist.allocationQuantum(16 * 1024); // Make benchmarks fast again.
  DefaultHttp2RemoteFlowController controller =
      new DefaultHttp2RemoteFlowController(connection, dist);
  connection.remote().flowController(controller);
  final KeepAliveEnforcer keepAliveEnforcer = new KeepAliveEnforcer(
      permitKeepAliveWithoutCalls, permitKeepAliveTimeInNanos, TimeUnit.NANOSECONDS);

  // Create the local flow controller configured to auto-refill the connection window.
  connection.local().flowController(
      new DefaultHttp2LocalFlowController(connection, DEFAULT_WINDOW_UPDATE_RATIO, true));
  frameWriter = new WriteMonitoringFrameWriter(frameWriter, keepAliveEnforcer);
  Http2ConnectionEncoder encoder = new DefaultHttp2ConnectionEncoder(connection, frameWriter);
  Http2ConnectionDecoder decoder = new DefaultHttp2ConnectionDecoder(connection, encoder,
      frameReader);

  Http2Settings settings = new Http2Settings();
  settings.initialWindowSize(flowControlWindow);
  settings.maxConcurrentStreams(maxStreams);
  settings.maxHeaderListSize(maxHeaderListSize);

  return new NettyServerHandler(
      channelUnused,
      connection,
      transportListener,
      streamTracerFactories,
      transportTracer,
      decoder, encoder, settings,
      maxMessageSize,
      keepAliveTimeInNanos, keepAliveTimeoutInNanos,
      maxConnectionIdleInNanos,
      maxConnectionAgeInNanos, maxConnectionAgeGraceInNanos,
      keepAliveEnforcer);
}
 

public WriteMonitoringFrameWriter(Http2FrameWriter delegate,
    KeepAliveEnforcer keepAliveEnforcer) {
  super(delegate);
  this.keepAliveEnforcer = keepAliveEnforcer;
}
 

protected final Http2FrameWriter frameWriter() {
  return frameWriter;
}
 

protected final Http2FrameWriter verifyWrite() {
  return verify(frameWriter);
}
 

protected final Http2FrameWriter verifyWrite(VerificationMode verificationMode) {
  return verify(frameWriter, verificationMode);
}
 

protected final Http2FrameWriter frameWriter() {
    return frameWriter;
}
 

Http2ServerKeepAliveHandler(Channel channel, Http2FrameWriter frameWriter, Timer keepAliveTimer,
                            long idleTimeoutMillis, long pingIntervalMillis, long maxConnectionAgeMillis) {
    super(channel, frameWriter, "server", keepAliveTimer,
          idleTimeoutMillis, pingIntervalMillis, maxConnectionAgeMillis);
}
 

private static Http2FrameWriter frameWriter() {
    return new Http2OutboundFrameLogger(new DefaultHttp2FrameWriter(), logger);
}
 

private HelloWorldHttp2Handler(Http2Connection connection, Http2FrameReader frameReader,
        Http2FrameWriter frameWriter, SimpleHttp2FrameListener listener) {
    super(connection, frameReader, frameWriter, listener);
    listener.encoder(encoder());
}
 

static NettyServerHandler newHandler(
    ServerTransportListener transportListener,
    ChannelPromise channelUnused,
    List<? extends ServerStreamTracer.Factory> streamTracerFactories,
    TransportTracer transportTracer,
    int maxStreams,
    boolean autoFlowControl,
    int flowControlWindow,
    int maxHeaderListSize,
    int maxMessageSize,
    long keepAliveTimeInNanos,
    long keepAliveTimeoutInNanos,
    long maxConnectionIdleInNanos,
    long maxConnectionAgeInNanos,
    long maxConnectionAgeGraceInNanos,
    boolean permitKeepAliveWithoutCalls,
    long permitKeepAliveTimeInNanos) {
  Preconditions.checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be positive: %s",
      maxHeaderListSize);
  Http2FrameLogger frameLogger = new Http2FrameLogger(LogLevel.DEBUG, NettyServerHandler.class);
  Http2HeadersDecoder headersDecoder = new GrpcHttp2ServerHeadersDecoder(maxHeaderListSize);
  Http2FrameReader frameReader = new Http2InboundFrameLogger(
      new DefaultHttp2FrameReader(headersDecoder), frameLogger);
  Http2FrameWriter frameWriter =
      new Http2OutboundFrameLogger(new DefaultHttp2FrameWriter(), frameLogger);
  return newHandler(
      channelUnused,
      frameReader,
      frameWriter,
      transportListener,
      streamTracerFactories,
      transportTracer,
      maxStreams,
      autoFlowControl,
      flowControlWindow,
      maxHeaderListSize,
      maxMessageSize,
      keepAliveTimeInNanos,
      keepAliveTimeoutInNanos,
      maxConnectionIdleInNanos,
      maxConnectionAgeInNanos,
      maxConnectionAgeGraceInNanos,
      permitKeepAliveWithoutCalls,
      permitKeepAliveTimeInNanos);
}
 

@VisibleForTesting
static NettyServerHandler newHandler(
    ChannelPromise channelUnused,
    Http2FrameReader frameReader,
    Http2FrameWriter frameWriter,
    ServerTransportListener transportListener,
    List<? extends ServerStreamTracer.Factory> streamTracerFactories,
    TransportTracer transportTracer,
    int maxStreams,
    boolean autoFlowControl,
    int flowControlWindow,
    int maxHeaderListSize,
    int maxMessageSize,
    long keepAliveTimeInNanos,
    long keepAliveTimeoutInNanos,
    long maxConnectionIdleInNanos,
    long maxConnectionAgeInNanos,
    long maxConnectionAgeGraceInNanos,
    boolean permitKeepAliveWithoutCalls,
    long permitKeepAliveTimeInNanos) {
  Preconditions.checkArgument(maxStreams > 0, "maxStreams must be positive: %s", maxStreams);
  Preconditions.checkArgument(flowControlWindow > 0, "flowControlWindow must be positive: %s",
      flowControlWindow);
  Preconditions.checkArgument(maxHeaderListSize > 0, "maxHeaderListSize must be positive: %s",
      maxHeaderListSize);
  Preconditions.checkArgument(maxMessageSize > 0, "maxMessageSize must be positive: %s",
      maxMessageSize);

  final Http2Connection connection = new DefaultHttp2Connection(true);
  WeightedFairQueueByteDistributor dist = new WeightedFairQueueByteDistributor(connection);
  dist.allocationQuantum(16 * 1024); // Make benchmarks fast again.
  DefaultHttp2RemoteFlowController controller =
      new DefaultHttp2RemoteFlowController(connection, dist);
  connection.remote().flowController(controller);
  final KeepAliveEnforcer keepAliveEnforcer = new KeepAliveEnforcer(
      permitKeepAliveWithoutCalls, permitKeepAliveTimeInNanos, TimeUnit.NANOSECONDS);

  // Create the local flow controller configured to auto-refill the connection window.
  connection.local().flowController(
      new DefaultHttp2LocalFlowController(connection, DEFAULT_WINDOW_UPDATE_RATIO, true));
  frameWriter = new WriteMonitoringFrameWriter(frameWriter, keepAliveEnforcer);
  Http2ConnectionEncoder encoder =
      new ListeningDefaultHttp2ConnectionEncoder(connection, frameWriter);
  encoder = new Http2ControlFrameLimitEncoder(encoder, 10000);
  Http2ConnectionDecoder decoder = new DefaultHttp2ConnectionDecoder(connection, encoder,
      frameReader);

  Http2Settings settings = new Http2Settings();
  settings.initialWindowSize(flowControlWindow);
  settings.maxConcurrentStreams(maxStreams);
  settings.maxHeaderListSize(maxHeaderListSize);

  return new NettyServerHandler(
      channelUnused,
      connection,
      transportListener,
      streamTracerFactories,
      transportTracer,
      decoder, encoder, settings,
      maxMessageSize,
      keepAliveTimeInNanos, keepAliveTimeoutInNanos,
      maxConnectionIdleInNanos,
      maxConnectionAgeInNanos, maxConnectionAgeGraceInNanos,
      keepAliveEnforcer,
      autoFlowControl);
}
 

public WriteMonitoringFrameWriter(Http2FrameWriter delegate,
    KeepAliveEnforcer keepAliveEnforcer) {
  super(delegate);
  this.keepAliveEnforcer = keepAliveEnforcer;
}
 

public ListeningDefaultHttp2ConnectionEncoder(
    Http2Connection connection, Http2FrameWriter frameWriter) {
  super(connection, frameWriter);
}
 

protected final Http2FrameWriter frameWriter() {
  return frameWriter;
}
 

protected final Http2FrameWriter verifyWrite() {
  return verify(frameWriter);
}
 

protected final Http2FrameWriter verifyWrite(VerificationMode verificationMode) {
  return verify(frameWriter, verificationMode);
}