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#ifndef QPID_LINEARSTORE_JRNL_UTILS_TXN_HDR_H
#define QPID_LINEARSTORE_JRNL_UTILS_TXN_HDR_H
/*
*
* 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_hdr.h
*
* Qpid asynchronous store plugin library
*
* File containing code for class mrg::journal::txn_hdr (transaction
* record header), used to start a transaction (commit or abort) record.
*
* \author Kim van der Riet
*/
#include "rec_hdr.h"
#pragma pack(1)
/**
* \brief Struct for transaction commit and abort records.
*
* Struct for DTX commit and abort records. Only the magic distinguishes between them. Since
* this record must be used in the context of a valid XID, the xidsize field must not be zero.
* Immediately following this record is the XID itself which is xidsize bytes long, followed by
* a rec_tail.
*
* Note that this record had its own rid distinct from the rids of the record(s) making up the
* transaction it is committing or aborting.
*
* Record header info in binary format (24 bytes):
* <pre>
* 0 7
* +---+---+---+---+---+---+---+---+ -+
* | magic | v | e | flags | |
* +---+---+---+---+---+---+---+---+ | struct hdr
* | rid | |
* +---+---+---+---+---+---+---+---+ -+
* | xidsize |
* +---+---+---+---+---+---+---+---+
* v = file version (If the format or encoding of this file changes, then this
* number should be incremented)
* e = endian flag, false (0x00) for little endian, true (0x01) for big endian
* </pre>
*
* Note that journal files should be transferable between 32- and 64-bit
* hardware of the same endianness, but not between hardware of opposite
* entianness without some sort of binary conversion utility. Thus buffering
* will be needed for types that change size between 32- and 64-bit compiles.
*/
typedef struct txn_hdr_t {
rec_hdr_t _rhdr;
uint64_t _xidsize; ///< XID size
} txn_hdr_t;
#pragma pack()
#endif // ifndef QPID_LINEARSTORE_JRNL_UTILS_TXN_HDR_H
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