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Diffstat (limited to 'cpp/src/qpid/legacystore/jrnl/deq_rec.h')
| -rw-r--r-- | cpp/src/qpid/legacystore/jrnl/deq_rec.h | 103 |
1 files changed, 103 insertions, 0 deletions
diff --git a/cpp/src/qpid/legacystore/jrnl/deq_rec.h b/cpp/src/qpid/legacystore/jrnl/deq_rec.h new file mode 100644 index 0000000000..d870b658da --- /dev/null +++ b/cpp/src/qpid/legacystore/jrnl/deq_rec.h @@ -0,0 +1,103 @@ +/* + * + * 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 deq_rec.h + * + * Qpid asynchronous store plugin library + * + * This file contains the code for the mrg::journal::deq_rec (journal dequeue + * record) class. See class documentation for details. + * + * \author Kim van der Riet + */ + +#ifndef QPID_LEGACYSTORE_JRNL_DEQ_REQ_H +#define QPID_LEGACYSTORE_JRNL_DEQ_REQ_H + +namespace mrg +{ +namespace journal +{ +class deq_rec; +} +} + +#include <cstddef> +#include "qpid/legacystore/jrnl/deq_hdr.h" +#include "qpid/legacystore/jrnl/jrec.h" + +namespace mrg +{ +namespace journal +{ + + /** + * \class deq_rec + * \brief Class to handle a single journal dequeue record. + */ + class deq_rec : public jrec + { + private: + deq_hdr _deq_hdr; ///< Dequeue header + const void* _xidp; ///< xid pointer for encoding (writing to disk) + void* _buff; ///< Pointer to buffer to receive data read from disk + rec_tail _deq_tail; ///< Record tail, only encoded if XID is present + + public: + // constructor used for read operations and xid will have memory allocated + deq_rec(); + // constructor used for write operations, where xid already exists + deq_rec(const u_int64_t rid, const u_int64_t drid, const void* const xidp, + const std::size_t xidlen, const bool owi, const bool txn_coml_commit); + virtual ~deq_rec(); + + // Prepare instance for use in reading data from journal + void reset(); + // Prepare instance for use in writing data to journal + void reset(const u_int64_t rid, const u_int64_t drid, const void* const xidp, + const std::size_t xidlen, const bool owi, const bool txn_coml_commit); + 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); + + inline bool is_txn_coml_commit() const { return _deq_hdr.is_txn_coml_commit(); } + inline u_int64_t rid() const { return _deq_hdr._rid; } + inline u_int64_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; + + private: + virtual void chk_hdr() const; + virtual void chk_hdr(u_int64_t rid) const; + virtual void chk_tail() const; + virtual void clean(); + }; // class deq_rec + +} // namespace journal +} // namespace mrg + +#endif // ifndef QPID_LEGACYSTORE_JRNL_DEQ_REQ_H |