| // |
| // ======================================================================== |
| // Copyright (c) 1995-2017 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.http2; |
| |
| import org.eclipse.jetty.http2.frames.Frame; |
| import org.eclipse.jetty.http2.frames.WindowUpdateFrame; |
| import org.eclipse.jetty.util.Callback; |
| |
| public class SimpleFlowControlStrategy extends AbstractFlowControlStrategy |
| { |
| public SimpleFlowControlStrategy() |
| { |
| this(DEFAULT_WINDOW_SIZE); |
| } |
| |
| public SimpleFlowControlStrategy(int initialStreamSendWindow) |
| { |
| super(initialStreamSendWindow); |
| } |
| |
| @Override |
| public void onDataConsumed(ISession session, IStream stream, int length) |
| { |
| if (length <= 0) |
| return; |
| |
| // This is the simple algorithm for flow control. |
| // This method is called when a whole flow controlled frame has been consumed. |
| // We send a WindowUpdate every time, even if the frame was very small. |
| |
| WindowUpdateFrame sessionFrame = new WindowUpdateFrame(0, length); |
| session.updateRecvWindow(length); |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Data consumed, increased session recv window by {} for {}", length, session); |
| |
| Frame[] streamFrame = Frame.EMPTY_ARRAY; |
| if (stream != null) |
| { |
| if (stream.isClosed()) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Data consumed, ignoring update stream recv window by {} for closed {}", length, stream); |
| } |
| else |
| { |
| streamFrame = new Frame[1]; |
| streamFrame[0] = new WindowUpdateFrame(stream.getId(), length); |
| stream.updateRecvWindow(length); |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Data consumed, increased stream recv window by {} for {}", length, stream); |
| } |
| } |
| |
| session.frames(stream, Callback.NOOP, sessionFrame, streamFrame); |
| } |
| } |