tryExpandConnectionFlowControlWindow() — netty Function Reference

Source Code

codec-http2/src/main/java/io/netty/handler/codec/http2/Http2FrameCodec.java lines 230–244

    private void tryExpandConnectionFlowControlWindow(Http2Connection connection) throws Http2Exception {
        if (initialFlowControlWindowSize != null) {
            // The window size in the settings explicitly excludes the connection window. So we manually manipulate the
            // connection window to accommodate more concurrent data per connection.
            Http2Stream connectionStream = connection.connectionStream();
            Http2LocalFlowController localFlowController = connection.local().flowController();
            final int delta = initialFlowControlWindowSize - localFlowController.initialWindowSize(connectionStream);
            // Only increase the connection window, don't decrease it.
            if (delta > 0) {
                // Double the delta just so a single stream can't exhaust the connection window.
                localFlowController.incrementWindowSize(connectionStream, Math.max(delta << 1, delta));
                flush(ctx);
            }
        }
    }