| // |
| // ======================================================================== |
| // 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.generator; |
| |
| import java.nio.ByteBuffer; |
| |
| import org.eclipse.jetty.http2.Flags; |
| import org.eclipse.jetty.http2.frames.Frame; |
| import org.eclipse.jetty.http2.frames.FrameType; |
| import org.eclipse.jetty.http2.frames.PriorityFrame; |
| import org.eclipse.jetty.io.ByteBufferPool; |
| import org.eclipse.jetty.util.BufferUtil; |
| |
| public class PriorityGenerator extends FrameGenerator |
| { |
| public PriorityGenerator(HeaderGenerator headerGenerator) |
| { |
| super(headerGenerator); |
| } |
| |
| @Override |
| public int generate(ByteBufferPool.Lease lease, Frame frame) |
| { |
| PriorityFrame priorityFrame = (PriorityFrame)frame; |
| return generatePriority(lease, priorityFrame.getStreamId(), priorityFrame.getParentStreamId(), priorityFrame.getWeight(), priorityFrame.isExclusive()); |
| } |
| |
| public int generatePriority(ByteBufferPool.Lease lease, int streamId, int parentStreamId, int weight, boolean exclusive) |
| { |
| ByteBuffer header = generateHeader(lease, FrameType.PRIORITY, PriorityFrame.PRIORITY_LENGTH, Flags.NONE, streamId); |
| generatePriorityBody(header, streamId, parentStreamId, weight, exclusive); |
| BufferUtil.flipToFlush(header, 0); |
| lease.append(header, true); |
| return Frame.HEADER_LENGTH + PriorityFrame.PRIORITY_LENGTH; |
| } |
| |
| public void generatePriorityBody(ByteBuffer header, int streamId, int parentStreamId, int weight, boolean exclusive) |
| { |
| if (streamId < 0) |
| throw new IllegalArgumentException("Invalid stream id: " + streamId); |
| if (parentStreamId < 0) |
| throw new IllegalArgumentException("Invalid parent stream id: " + parentStreamId); |
| if (parentStreamId == streamId) |
| throw new IllegalArgumentException("Stream " + streamId + " cannot depend on stream " + parentStreamId); |
| if (weight < 1 || weight > 256) |
| throw new IllegalArgumentException("Invalid weight: " + weight); |
| |
| if (exclusive) |
| parentStreamId |= 0x80_00_00_00; |
| header.putInt(parentStreamId); |
| header.put((byte)(weight - 1)); |
| } |
| } |