diff options
Diffstat (limited to 'cpp/src/qpid/legacystore/jrnl/enq_rec.h')
| -rw-r--r-- | cpp/src/qpid/legacystore/jrnl/enq_rec.h | 116 |
1 files changed, 116 insertions, 0 deletions
diff --git a/cpp/src/qpid/legacystore/jrnl/enq_rec.h b/cpp/src/qpid/legacystore/jrnl/enq_rec.h new file mode 100644 index 0000000000..805a96a1aa --- /dev/null +++ b/cpp/src/qpid/legacystore/jrnl/enq_rec.h @@ -0,0 +1,116 @@ +/* + * + * 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 enq_rec.h + * + * Qpid asynchronous store plugin library + * + * This file contains the code for the mrg::journal::enq_rec (journal enqueue + * record) class. See class documentation for details. + */ + +#ifndef QPID_LEGACYSTORE_JRNL_ENQ_REC_H +#define QPID_LEGACYSTORE_JRNL_ENQ_REC_H + +namespace mrg +{ +namespace journal +{ +class enq_rec; +} +} + +#include <cstddef> +#include "qpid/legacystore/jrnl/enq_hdr.h" +#include "qpid/legacystore/jrnl/jrec.h" + +namespace mrg +{ +namespace journal +{ + + /** + * \class enq_rec + * \brief Class to handle a single journal enqueue record. + */ + class enq_rec : public jrec + { + private: + enq_hdr _enq_hdr; + const void* _xidp; ///< xid pointer for encoding (for writing to disk) + const void* _data; ///< Pointer to data to be written to disk + void* _buff; ///< Pointer to buffer to receive data read from disk + rec_tail _enq_tail; + + public: + /** + * \brief Constructor used for read operations. + */ + enq_rec(); + + /** + * \brief Constructor used for write operations, where mbuf contains data to be written. + */ + enq_rec(const u_int64_t rid, const void* const dbuf, const std::size_t dlen, + const void* const xidp, const std::size_t xidlen, const bool owi, const bool transient); + + /** + * \brief Destructor + */ + virtual ~enq_rec(); + + // Prepare instance for use in reading data from journal, xid and data will be allocated + void reset(); + // Prepare instance for use in writing data to journal + void reset(const u_int64_t rid, const void* const dbuf, const std::size_t dlen, + const void* const xidp, const std::size_t xidlen, const bool owi, const bool transient, + const bool external); + + 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::size_t get_data(void** const datapp); + inline bool is_transient() const { return _enq_hdr.is_transient(); } + inline bool is_external() const { return _enq_hdr.is_external(); } + std::string& str(std::string& str) const; + inline std::size_t data_size() const { return _enq_hdr._dsize; } + inline std::size_t xid_size() const { return _enq_hdr._xidsize; } + std::size_t rec_size() const; + static std::size_t rec_size(const std::size_t xidsize, const std::size_t dsize, const bool external); + inline u_int64_t rid() const { return _enq_hdr._rid; } + void set_rid(const u_int64_t rid); + + private: + void chk_hdr() const; + void chk_hdr(u_int64_t rid) const; + void chk_tail() const; + virtual void clean(); + }; // class enq_rec + +} // namespace journal +} // namespace mrg + +#endif // ifndef QPID_LEGACYSTORE_JRNL_ENQ_REC_H |