common/src/org/apache/qpid/framing/HeartbeatBody.java


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/*
 *
 * Copyright (c) 2006 The Apache Software Foundation
 *
 * 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 org.apache.qpid.framing;

import org.apache.mina.common.ByteBuffer;

public class HeartbeatBody extends AMQBody
{
    public static final byte TYPE = 8;
    public static AMQFrame FRAME = new HeartbeatBody().toFrame();

    protected byte getType()
    {
        return TYPE;
    }

    protected int getSize()
    {
        return 0;//heartbeats we generate have no payload
    }

    protected void writePayload(ByteBuffer buffer)
    {
    }

    protected void populateFromBuffer(ByteBuffer buffer, long size) throws AMQFrameDecodingException
    {
        if(size > 0)
        {
            //allow other implementations to have a payload, but ignore it:
            buffer.skip((int) size);
        }
    }

    public AMQFrame toFrame()
    {
        return new AMQFrame(0, this);
    }
}