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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.
*
*/
#ifndef QPID_LINEARSTORE_JOURNAL_DEQ_REQ_H
#define QPID_LINEARSTORE_JOURNAL_DEQ_REQ_H
#include "qpid/linearstore/journal/jrec.h"
#include "qpid/linearstore/journal/utils/deq_hdr.h"
#include "qpid/linearstore/journal/utils/rec_tail.h"
namespace qpid {
namespace linearstore {
namespace journal {
/**
* \class deq_rec
* \brief Class to handle a single journal dequeue record.
*/
class deq_rec : public jrec
{
private:
::deq_hdr_t _deq_hdr; ///< Local instance of dequeue header struct
const void* _xidp; ///< xid pointer for encoding (writing to disk)
void* _xid_buff; ///< Pointer to buffer to receive xid read from disk
::rec_tail_t _deq_tail; ///< Local instance of enqueue tail struct, only encoded if XID is present
public:
deq_rec();
virtual ~deq_rec();
void reset(const uint64_t serial, const uint64_t rid, const uint64_t drid, const void* const xidp,
const std::size_t xidlen, const bool txn_coml_commit);
uint32_t encode(void* wptr, uint32_t rec_offs_dblks, uint32_t max_size_dblks, Checksum& checksum);
bool decode(::rec_hdr_t& h, std::ifstream* ifsp, std::size_t& rec_offs, const std::streampos rec_start);
inline bool is_txn_coml_commit() const { return ::is_txn_coml_commit(&_deq_hdr); }
inline uint64_t rid() const { return _deq_hdr._rhdr._rid; }
inline uint64_t deq_rid() const { return _deq_hdr._deq_rid; }
std::size_t get_xid(void** const xidpp);
std::string& str(std::string& str) const;
inline std::size_t data_size() const { return 0; } // This record never carries data
std::size_t xid_size() const;
std::size_t rec_size() const;
void check_rec_tail(const std::streampos rec_start) const;
private:
virtual void clean();
};
}}}
#endif // ifndef QPID_LINEARSTORE_JOURNAL_DEQ_REQ_H
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