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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.
*
*/
#include <boost/format.hpp>
#include "Frame.h"
#include "qpid/QpidError.h"
#include "AMQRequestBody.h"
#include "AMQResponseBody.h"
namespace qpid {
namespace framing {
namespace {
struct GetBodyVisitor : public NoBlankVisitor<AMQBody*> {
QPID_USING_NOBLANK(AMQBody*);
AMQBody* operator()(MethodHolder& h) const { return h.getMethod(); }
template <class T> AMQBody* operator()(T& t) const { return &t; }
};
}
AMQBody* Frame::getBody() {
return boost::apply_visitor(GetBodyVisitor(), body);
}
const AMQBody* Frame::getBody() const {
return boost::apply_visitor(GetBodyVisitor(), const_cast<Variant&>(body));
}
void Frame::encode(Buffer& buffer)
{
buffer.putOctet(getBody()->type());
buffer.putShort(channel);
buffer.putLong(getBody()->size());
getBody()->encode(buffer);
buffer.putOctet(0xCE);
}
uint32_t Frame::size() const{
return 1/*type*/ + 2/*channel*/ + 4/*body size*/ + getBody()->size()
+ 1/*0xCE*/;
}
bool Frame::decode(Buffer& buffer)
{
if(buffer.available() < 7)
return false;
buffer.record();
uint32_t frameSize = decodeHead(buffer);
if(buffer.available() < frameSize + 1){
buffer.restore();
return false;
}
decodeBody(buffer, frameSize);
uint8_t end = buffer.getOctet();
if(end != 0xCE) THROW_QPID_ERROR(FRAMING_ERROR, "Frame end not found");
return true;
}
uint32_t Frame::decodeHead(Buffer& buffer){
type = buffer.getOctet();
channel = buffer.getShort();
return buffer.getLong();
}
void Frame::decodeBody(Buffer& buffer, uint32_t size)
{
switch(type)
{
case METHOD_BODY:
case REQUEST_BODY:
case RESPONSE_BODY: {
ClassId c=buffer.getShort();
MethodId m=buffer.getShort();
body = MethodHolder(c,m);
break;
}
case HEADER_BODY:
body = AMQHeaderBody();
break;
case CONTENT_BODY:
body = AMQContentBody();
break;
case HEARTBEAT_BODY:
body = AMQHeartbeatBody();
break;
default:
THROW_QPID_ERROR(
FRAMING_ERROR,
boost::format("Unknown frame type %d") % type);
}
getBody()->decode(buffer, size);
}
std::ostream& operator<<(std::ostream& out, const Frame& f)
{
return out << "Frame[channel=" << f.getChannel() << "; " << f.body << "]";
}
}} // namespace qpid::framing
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