io.undertow.protocols.http2.Http2PingStreamSinkChannel Maven / Gradle / Ivy

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This artifact provides a single jar that contains all classes required to use remote EJB and JMS, including all dependencies. It is intended for use by those not using maven, maven users should just import the EJB and JMS BOM's instead (shaded JAR's cause lots of problems with maven, as it is very easy to inadvertently end up with different versions on classes on the class path).

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/*
 * JBoss, Home of Professional Open Source.
 * Copyright 2014 Red Hat, Inc., and individual contributors
 * as indicated by the @author tags.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package io.undertow.protocols.http2;

import static io.undertow.protocols.http2.Http2Channel.PING_FRAME_LENGTH;

import java.nio.ByteBuffer;

import io.undertow.UndertowMessages;
import io.undertow.server.protocol.framed.SendFrameHeader;
import io.undertow.util.ImmediatePooledByteBuffer;

/**
 * @author Stuart Douglas
 */
class Http2PingStreamSinkChannel extends Http2NoDataStreamSinkChannel {

    public static final int HEADER = (PING_FRAME_LENGTH << 8) | (Http2Channel.FRAME_TYPE_PING);
    private final byte[] data;
    private final boolean ack;

    protected Http2PingStreamSinkChannel(Http2Channel channel, byte[] data, boolean ack) {
        super(channel);
        if (data.length != PING_FRAME_LENGTH) {
            throw new IllegalArgumentException(UndertowMessages.MESSAGES.httpPingDataMustBeLength8());
        }
        this.data = data;
        this.ack = ack;
    }

    @Override
    protected SendFrameHeader createFrameHeader() {
        ByteBuffer buf = ByteBuffer.allocate(17);
        Http2ProtocolUtils.putInt(buf, HEADER);
        buf.put((byte) (ack ? Http2Channel.PING_FLAG_ACK : 0));
        Http2ProtocolUtils.putInt(buf, 0); //stream id, must be zero
        for (int i = 0; i < PING_FRAME_LENGTH; ++i) {
            buf.put(data[i]);
        }
        buf.flip();
        return new SendFrameHeader(new ImmediatePooledByteBuffer(buf));
    }

}