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/*
*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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;
import org.apache.mina.common.IoSession;
import org.apache.mina.filter.codec.ProtocolDecoderOutput;
import org.apache.qpid.protocol.AMQVersionAwareProtocolSession;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class AMQDataBlockDecoder
{
private static final String SESSION_METHOD_BODY_FACTORY = "QPID_SESSION_METHOD_BODY_FACTORY";
private static final BodyFactory[] _bodiesSupported = new BodyFactory[Byte.MAX_VALUE];
static
{
_bodiesSupported[ContentHeaderBody.TYPE] = ContentHeaderBodyFactory.getInstance();
_bodiesSupported[ContentBody.TYPE] = ContentBodyFactory.getInstance();
_bodiesSupported[HeartbeatBody.TYPE] = new HeartbeatBodyFactory();
}
Logger _logger = LoggerFactory.getLogger(AMQDataBlockDecoder.class);
public AMQDataBlockDecoder()
{ }
public boolean decodable(java.nio.ByteBuffer in) throws AMQFrameDecodingException
{
final int remainingAfterAttributes = in.remaining() - (1 + 2 + 4 + 1);
// type, channel, body length and end byte
if (remainingAfterAttributes < 0)
{
return false;
}
in.position(in.position() + 1 + 2);
// Get an unsigned int, lifted from MINA ByteBuffer getUnsignedInt()
final long bodySize = in.getInt() & 0xffffffffL;
return (remainingAfterAttributes >= bodySize);
}
public AMQFrame createAndPopulateFrame(AMQMethodBodyFactory methodBodyFactory, ByteBuffer in)
throws AMQFrameDecodingException, AMQProtocolVersionException
{
final byte type = in.get();
BodyFactory bodyFactory;
if (type == AMQMethodBody.TYPE)
{
bodyFactory = methodBodyFactory;
}
else
{
bodyFactory = _bodiesSupported[type];
}
if (bodyFactory == null)
{
throw new AMQFrameDecodingException(null, "Unsupported frame type: " + type, null);
}
final int channel = in.getUnsignedShort();
final long bodySize = in.getUnsignedInt();
// bodySize can be zero
if ((channel < 0) || (bodySize < 0))
{
throw new AMQFrameDecodingException(null, "Undecodable frame: type = " + type + " channel = " + channel
+ " bodySize = " + bodySize, null);
}
AMQFrame frame = new AMQFrame(in, channel, bodySize, bodyFactory);
byte marker = in.get();
if ((marker & 0xFF) != 0xCE)
{
throw new AMQFrameDecodingException(null, "End of frame marker not found. Read " + marker + " length=" + bodySize
+ " type=" + type, null);
}
return frame;
}
public void decode(IoSession session, ByteBuffer in, ProtocolDecoderOutput out) throws Exception
{
AMQMethodBodyFactory bodyFactory = (AMQMethodBodyFactory) session.getAttribute(SESSION_METHOD_BODY_FACTORY);
if (bodyFactory == null)
{
AMQVersionAwareProtocolSession protocolSession = (AMQVersionAwareProtocolSession) session.getAttachment();
bodyFactory = new AMQMethodBodyFactory(protocolSession);
session.setAttribute(SESSION_METHOD_BODY_FACTORY, bodyFactory);
}
out.write(createAndPopulateFrame(bodyFactory, in));
}
public boolean decodable(ByteBuffer msg) throws AMQFrameDecodingException
{
return decodable(msg.buf());
}
public AMQDataBlock createAndPopulateFrame(AMQMethodBodyFactory factory, java.nio.ByteBuffer msg) throws AMQProtocolVersionException, AMQFrameDecodingException
{
return createAndPopulateFrame(factory, ByteBuffer.wrap(msg));
}
}
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