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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.
*
*/
/**
* \file txn_rec.h
*
* Qpid asynchronous store plugin library
*
* This file contains the code for the mrg::journal::txn_rec (journal data
* record) class. See class documentation for details.
*
* \author Kim van der Riet
*/
#ifndef QPID_LEGACYSTORE_JRNL_TXN_REC_H
#define QPID_LEGACYSTORE_JRNL_TXN_REC_H
namespace mrg
{
namespace journal
{
class txn_rec;
}
}
#include <cstddef>
#include "qpid/legacystore/jrnl/jrec.h"
#include "qpid/legacystore/jrnl/txn_hdr.h"
namespace mrg
{
namespace journal
{
/**
* \class txn_rec
* \brief Class to handle a single journal DTX commit or abort record.
*/
class txn_rec : public jrec
{
private:
txn_hdr _txn_hdr; ///< transaction header
const void* _xidp; ///< xid pointer for encoding (writing to disk)
void* _buff; ///< Pointer to buffer to receive data read from disk
rec_tail _txn_tail; ///< Record tail
public:
// constructor used for read operations and xid must have memory allocated
txn_rec();
// constructor used for write operations, where xid already exists
txn_rec(const u_int32_t magic, const u_int64_t rid, const void* const xidp,
const std::size_t xidlen, const bool owi);
virtual ~txn_rec();
// Prepare instance for use in reading data from journal
void reset(const u_int32_t magic);
// Prepare instance for use in writing data to journal
void reset(const u_int32_t magic, const u_int64_t rid, const void* const xidp,
const std::size_t xidlen, const bool owi);
u_int32_t encode(void* wptr, u_int32_t rec_offs_dblks, u_int32_t max_size_dblks);
u_int32_t decode(rec_hdr& h, void* rptr, u_int32_t rec_offs_dblks,
u_int32_t max_size_dblks);
// Decode used for recover
bool rcv_decode(rec_hdr h, std::ifstream* ifsp, std::size_t& rec_offs);
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;
inline u_int64_t rid() const { return _txn_hdr._rid; }
private:
void chk_hdr() const;
void chk_hdr(u_int64_t rid) const;
void chk_tail() const;
virtual void clean();
}; // class txn_rec
} // namespace journal
} // namespace mrg
#endif // ifndef QPID_LEGACYSTORE_JRNL_TXN_REC_H
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