DefaultHttp2ConnectionEncoder Class — netty Architecture

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/DefaultHttp2ConnectionEncoder.java lines 41–629

public class DefaultHttp2ConnectionEncoder implements Http2ConnectionEncoder, Http2SettingsReceivedConsumer {
    private final Http2FrameWriter frameWriter;
    private final Http2Connection connection;
    private Http2LifecycleManager lifecycleManager;
    // We prefer ArrayDeque to LinkedList because later will produce more GC.
    // This initial capacity is plenty for SETTINGS traffic.
    private final Queue<Http2Settings> outstandingLocalSettingsQueue = new ArrayDeque<Http2Settings>(4);
    private Queue<Http2Settings> outstandingRemoteSettingsQueue;

    public DefaultHttp2ConnectionEncoder(Http2Connection connection, Http2FrameWriter frameWriter) {
        this.connection = checkNotNull(connection, "connection");
        this.frameWriter = checkNotNull(frameWriter, "frameWriter");
        if (connection.remote().flowController() == null) {
            connection.remote().flowController(new DefaultHttp2RemoteFlowController(connection));
        }
    }

    @Override
    public void lifecycleManager(Http2LifecycleManager lifecycleManager) {
        this.lifecycleManager = checkNotNull(lifecycleManager, "lifecycleManager");
    }

    @Override
    public Http2FrameWriter frameWriter() {
        return frameWriter;
    }

    @Override
    public Http2Connection connection() {
        return connection;
    }

    @Override
    public final Http2RemoteFlowController flowController() {
        return connection().remote().flowController();
    }

    @Override
    public void remoteSettings(Http2Settings settings) throws Http2Exception {
        Boolean pushEnabled = settings.pushEnabled();
        Http2FrameWriter.Configuration config = configuration();
        Http2HeadersEncoder.Configuration outboundHeaderConfig = config.headersConfiguration();
        Http2FrameSizePolicy outboundFrameSizePolicy = config.frameSizePolicy();
        if (pushEnabled != null) {
            if (!connection.isServer() && pushEnabled) {
                throw connectionError(PROTOCOL_ERROR,
                    "Client received a value of ENABLE_PUSH specified to other than 0");
            }
            connection.remote().allowPushTo(pushEnabled);
        }

        Long maxConcurrentStreams = settings.maxConcurrentStreams();
        if (maxConcurrentStreams != null) {
            connection.local().maxActiveStreams((int) min(maxConcurrentStreams, MAX_VALUE));
        }

        Long headerTableSize = settings.headerTableSize();
        if (headerTableSize != null) {
            outboundHeaderConfig.maxHeaderTableSize(headerTableSize);
        }

        Long maxHeaderListSize = settings.maxHeaderListSize();
        if (maxHeaderListSize != null) {
            outboundHeaderConfig.maxHeaderListSize(maxHeaderListSize);
        }

        Integer maxFrameSize = settings.maxFrameSize();
        if (maxFrameSize != null) {
            outboundFrameSizePolicy.maxFrameSize(maxFrameSize);
        }

        Integer initialWindowSize = settings.initialWindowSize();
        if (initialWindowSize != null) {
            flowController().initialWindowSize(initialWindowSize);
        }
    }

    @Override
    public ChannelFuture writeData(final ChannelHandlerContext ctx, final int streamId, ByteBuf data, int padding,
            final boolean endOfStream, ChannelPromise promise) {
        promise = promise.unvoid();