| // |
| // ======================================================================== |
| // 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.http.MetaData; |
| 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.PushPromiseFrame; |
| import org.eclipse.jetty.http2.hpack.HpackEncoder; |
| import org.eclipse.jetty.io.ByteBufferPool; |
| import org.eclipse.jetty.util.BufferUtil; |
| |
| public class PushPromiseGenerator extends FrameGenerator |
| { |
| private final HpackEncoder encoder; |
| |
| public PushPromiseGenerator(HeaderGenerator headerGenerator, HpackEncoder encoder) |
| { |
| super(headerGenerator); |
| this.encoder = encoder; |
| } |
| |
| @Override |
| public int generate(ByteBufferPool.Lease lease, Frame frame) |
| { |
| PushPromiseFrame pushPromiseFrame = (PushPromiseFrame)frame; |
| return generatePushPromise(lease, pushPromiseFrame.getStreamId(), pushPromiseFrame.getPromisedStreamId(), pushPromiseFrame.getMetaData()); |
| } |
| |
| public int generatePushPromise(ByteBufferPool.Lease lease, int streamId, int promisedStreamId, MetaData metaData) |
| { |
| if (streamId < 0) |
| throw new IllegalArgumentException("Invalid stream id: " + streamId); |
| if (promisedStreamId < 0) |
| throw new IllegalArgumentException("Invalid promised stream id: " + promisedStreamId); |
| |
| int maxFrameSize = getMaxFrameSize(); |
| // The promised streamId space. |
| int extraSpace = 4; |
| maxFrameSize -= extraSpace; |
| |
| ByteBuffer hpacked = lease.acquire(maxFrameSize, false); |
| BufferUtil.clearToFill(hpacked); |
| encoder.encode(hpacked, metaData); |
| int hpackedLength = hpacked.position(); |
| BufferUtil.flipToFlush(hpacked, 0); |
| |
| int length = hpackedLength + extraSpace; |
| int flags = Flags.END_HEADERS; |
| |
| ByteBuffer header = generateHeader(lease, FrameType.PUSH_PROMISE, length, flags, streamId); |
| header.putInt(promisedStreamId); |
| BufferUtil.flipToFlush(header, 0); |
| |
| lease.append(header, true); |
| lease.append(hpacked, true); |
| |
| return Frame.HEADER_LENGTH + length; |
| } |
| } |