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#ifndef _AMQFrame_
#define _AMQFrame_
/*
*
* 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 "AMQDataBlock.h"
#include "AMQHeaderBody.h"
#include "AMQContentBody.h"
#include "AMQHeartbeatBody.h"
#include "MethodHolder.h"
#include "ProtocolVersion.h"
#include <boost/cast.hpp>
#include <boost/variant.hpp>
namespace qpid {
namespace framing {
class AMQFrame : public AMQDataBlock
{
public:
AMQFrame() : bof(true), eof(true), bos(true), eos(true), subchannel(0), channel(0) {}
/** Construct a frame with a copy of b */
AMQFrame(ChannelId c, const AMQBody* b) : bof(true), eof(true), bos(true), eos(true), subchannel(0), channel(c) {
setBody(*b);
}
AMQFrame(ChannelId c, const AMQBody& b) : bof(true), eof(true), bos(true), eos(true), subchannel(0), channel(c) {
setBody(b);
}
ChannelId getChannel() const { return channel; }
void setChannel(ChannelId c) { channel = c; }
AMQBody* getBody();
const AMQBody* getBody() const;
AMQMethodBody* getMethod() { return getBody()->getMethod(); }
const AMQMethodBody* getMethod() const { return getBody()->getMethod(); }
/** Copy a body instance to the frame */
void setBody(const AMQBody& b) { CopyVisitor cv(*this); b.accept(cv); }
/** Convenience template to cast the body to an expected type. */
template <class T> T* castBody() {
return boost::polymorphic_downcast<T*>(getBody());
}
template <class T> const T* castBody() const {
return boost::polymorphic_downcast<const T*>(getBody());
}
bool empty() { return boost::get<boost::blank>(&body); }
void encode(Buffer& buffer) const;
bool decode(Buffer& buffer);
uint32_t size() const;
static uint32_t frameOverhead();
private:
struct CopyVisitor : public AMQBodyConstVisitor {
AMQFrame& frame;
CopyVisitor(AMQFrame& f) : frame(f) {}
void visit(const AMQHeaderBody& x) { frame.body=x; }
void visit(const AMQContentBody& x) { frame.body=x; }
void visit(const AMQHeartbeatBody& x) { frame.body=x; }
void visit(const AMQMethodBody& x) { frame.body=MethodHolder(x); }
};
friend struct CopyVisitor;
typedef boost::variant<boost::blank,
AMQHeaderBody,
AMQContentBody,
AMQHeartbeatBody,
MethodHolder> Variant;
void visit(AMQHeaderBody& x) { body=x; }
void decodeBody(Buffer& buffer, uint32_t size, uint8_t type);
bool bof;
bool eof;
bool bos;
bool eos;
uint8_t subchannel;
uint16_t channel;
Variant body;
};
std::ostream& operator<<(std::ostream&, const AMQFrame&);
}} // namespace qpid::framing
#endif
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