diff options
Diffstat (limited to 'cpp/src/qpid/legacystore/jrnl/txn_rec.cpp')
| -rw-r--r-- | cpp/src/qpid/legacystore/jrnl/txn_rec.cpp | 447 |
1 files changed, 447 insertions, 0 deletions
diff --git a/cpp/src/qpid/legacystore/jrnl/txn_rec.cpp b/cpp/src/qpid/legacystore/jrnl/txn_rec.cpp new file mode 100644 index 0000000000..918a6ce902 --- /dev/null +++ b/cpp/src/qpid/legacystore/jrnl/txn_rec.cpp @@ -0,0 +1,447 @@ +/* + * + * 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.cpp + * + * Qpid asynchronous store plugin library + * + * This file contains the code for the mrg::journal::txn_rec (journal dequeue + * record) class. See comments in file txn_rec.h for details. + * + * \author Kim van der Riet + */ + +#include "qpid/legacystore/jrnl/txn_rec.h" + +#include <cassert> +#include <cerrno> +#include <cstdlib> +#include <cstring> +#include <iomanip> +#include "qpid/legacystore/jrnl/jerrno.h" +#include "qpid/legacystore/jrnl/jexception.h" +#include <sstream> + +namespace mrg +{ +namespace journal +{ + +txn_rec::txn_rec(): + _txn_hdr(), + _xidp(0), + _buff(0), + _txn_tail() +{ + _txn_hdr._version = RHM_JDAT_VERSION; +} + +txn_rec::txn_rec(const u_int32_t magic, const u_int64_t rid, const void* const xidp, + const std::size_t xidlen, const bool owi): + _txn_hdr(magic, RHM_JDAT_VERSION, rid, xidlen, owi), + _xidp(xidp), + _buff(0), + _txn_tail(_txn_hdr) +{} + +txn_rec::~txn_rec() +{ + clean(); +} + +void +txn_rec::reset(const u_int32_t magic) +{ + _txn_hdr._magic = magic; + _txn_hdr._rid = 0; + _txn_hdr._xidsize = 0; + _xidp = 0; + _buff = 0; + _txn_tail._xmagic = ~magic; + _txn_tail._rid = 0; +} + +void +txn_rec::reset(const u_int32_t magic, const u_int64_t rid, const void* const xidp, + const std::size_t xidlen, const bool owi) +{ + _txn_hdr._magic = magic; + _txn_hdr._rid = rid; + _txn_hdr.set_owi(owi); + _txn_hdr._xidsize = xidlen; + _xidp = xidp; + _buff = 0; + _txn_tail._xmagic = ~magic; + _txn_tail._rid = rid; +} + +u_int32_t +txn_rec::encode(void* wptr, u_int32_t rec_offs_dblks, u_int32_t max_size_dblks) +{ + assert(wptr != 0); + assert(max_size_dblks > 0); + assert(_xidp != 0 && _txn_hdr._xidsize > 0); + + std::size_t rec_offs = rec_offs_dblks * JRNL_DBLK_SIZE; + std::size_t rem = max_size_dblks * JRNL_DBLK_SIZE; + std::size_t wr_cnt = 0; + if (rec_offs_dblks) // Continuation of split dequeue record (over 2 or more pages) + { + if (size_dblks(rec_size()) - rec_offs_dblks > max_size_dblks) // Further split required + { + rec_offs -= sizeof(_txn_hdr); + std::size_t wsize = _txn_hdr._xidsize > rec_offs ? _txn_hdr._xidsize - rec_offs : 0; + std::size_t wsize2 = wsize; + if (wsize) + { + if (wsize > rem) + wsize = rem; + std::memcpy(wptr, (const char*)_xidp + rec_offs, wsize); + wr_cnt += wsize; + rem -= wsize; + } + rec_offs -= _txn_hdr._xidsize - wsize2; + if (rem) + { + wsize = sizeof(_txn_tail) > rec_offs ? sizeof(_txn_tail) - rec_offs : 0; + wsize2 = wsize; + if (wsize) + { + if (wsize > rem) + wsize = rem; + std::memcpy((char*)wptr + wr_cnt, (char*)&_txn_tail + rec_offs, wsize); + wr_cnt += wsize; + rem -= wsize; + } + rec_offs -= sizeof(_txn_tail) - wsize2; + } + assert(rem == 0); + assert(rec_offs == 0); + } + else // No further split required + { + rec_offs -= sizeof(_txn_hdr); + std::size_t wsize = _txn_hdr._xidsize > rec_offs ? _txn_hdr._xidsize - rec_offs : 0; + if (wsize) + { + std::memcpy(wptr, (const char*)_xidp + rec_offs, wsize); + wr_cnt += wsize; + } + rec_offs -= _txn_hdr._xidsize - wsize; + wsize = sizeof(_txn_tail) > rec_offs ? sizeof(_txn_tail) - rec_offs : 0; + if (wsize) + { + std::memcpy((char*)wptr + wr_cnt, (char*)&_txn_tail + rec_offs, wsize); + wr_cnt += wsize; +#ifdef RHM_CLEAN + std::size_t rec_offs = rec_offs_dblks * JRNL_DBLK_SIZE; + std::size_t dblk_rec_size = size_dblks(rec_size() - rec_offs) * JRNL_DBLK_SIZE; + std::memset((char*)wptr + wr_cnt, RHM_CLEAN_CHAR, dblk_rec_size - wr_cnt); +#endif + } + rec_offs -= sizeof(_txn_tail) - wsize; + assert(rec_offs == 0); + } + } + else // Start at beginning of data record + { + // Assumption: the header will always fit into the first dblk + std::memcpy(wptr, (void*)&_txn_hdr, sizeof(_txn_hdr)); + wr_cnt = sizeof(_txn_hdr); + if (size_dblks(rec_size()) > max_size_dblks) // Split required + { + std::size_t wsize; + rem -= sizeof(_txn_hdr); + if (rem) + { + wsize = rem >= _txn_hdr._xidsize ? _txn_hdr._xidsize : rem; + std::memcpy((char*)wptr + wr_cnt, _xidp, wsize); + wr_cnt += wsize; + rem -= wsize; + } + if (rem) + { + wsize = rem >= sizeof(_txn_tail) ? sizeof(_txn_tail) : rem; + std::memcpy((char*)wptr + wr_cnt, (void*)&_txn_tail, wsize); + wr_cnt += wsize; + rem -= wsize; + } + assert(rem == 0); + } + else // No split required + { + std::memcpy((char*)wptr + wr_cnt, _xidp, _txn_hdr._xidsize); + wr_cnt += _txn_hdr._xidsize; + std::memcpy((char*)wptr + wr_cnt, (void*)&_txn_tail, sizeof(_txn_tail)); + wr_cnt += sizeof(_txn_tail); +#ifdef RHM_CLEAN + std::size_t dblk_rec_size = size_dblks(rec_size()) * JRNL_DBLK_SIZE; + std::memset((char*)wptr + wr_cnt, RHM_CLEAN_CHAR, dblk_rec_size - wr_cnt); +#endif + } + } + return size_dblks(wr_cnt); +} + +u_int32_t +txn_rec::decode(rec_hdr& h, void* rptr, u_int32_t rec_offs_dblks, u_int32_t max_size_dblks) +{ + assert(rptr != 0); + assert(max_size_dblks > 0); + + std::size_t rd_cnt = 0; + if (rec_offs_dblks) // Continuation of record on new page + { + const u_int32_t hdr_xid_dblks = size_dblks(txn_hdr::size() + _txn_hdr._xidsize); + const u_int32_t hdr_xid_tail_dblks = size_dblks(txn_hdr::size() + _txn_hdr._xidsize + + rec_tail::size()); + const std::size_t rec_offs = rec_offs_dblks * JRNL_DBLK_SIZE; + + if (hdr_xid_tail_dblks - rec_offs_dblks <= max_size_dblks) + { + // Remainder of xid fits within this page + if (rec_offs - txn_hdr::size() < _txn_hdr._xidsize) + { + // Part of xid still outstanding, copy remainder of xid and tail + const std::size_t xid_offs = rec_offs - txn_hdr::size(); + const std::size_t xid_rem = _txn_hdr._xidsize - xid_offs; + std::memcpy((char*)_buff + xid_offs, rptr, xid_rem); + rd_cnt = xid_rem; + std::memcpy((void*)&_txn_tail, ((char*)rptr + rd_cnt), sizeof(_txn_tail)); + chk_tail(); + rd_cnt += sizeof(_txn_tail); + } + else + { + // Tail or part of tail only outstanding, complete tail + const std::size_t tail_offs = rec_offs - txn_hdr::size() - _txn_hdr._xidsize; + const std::size_t tail_rem = rec_tail::size() - tail_offs; + std::memcpy((char*)&_txn_tail + tail_offs, rptr, tail_rem); + chk_tail(); + rd_cnt = tail_rem; + } + } + else if (hdr_xid_dblks - rec_offs_dblks <= max_size_dblks) + { + // Remainder of xid fits within this page, tail split + const std::size_t xid_offs = rec_offs - txn_hdr::size(); + const std::size_t xid_rem = _txn_hdr._xidsize - xid_offs; + std::memcpy((char*)_buff + xid_offs, rptr, xid_rem); + rd_cnt += xid_rem; + const std::size_t tail_rem = (max_size_dblks * JRNL_DBLK_SIZE) - rd_cnt; + if (tail_rem) + { + std::memcpy((void*)&_txn_tail, ((char*)rptr + xid_rem), tail_rem); + rd_cnt += tail_rem; + } + } + else + { + // Remainder of xid split + const std::size_t xid_cp_size = (max_size_dblks * JRNL_DBLK_SIZE); + std::memcpy((char*)_buff + rec_offs - txn_hdr::size(), rptr, xid_cp_size); + rd_cnt += xid_cp_size; + } + } + else // Start of record + { + // Get and check header + _txn_hdr.hdr_copy(h); + rd_cnt = sizeof(rec_hdr); +#if defined(JRNL_BIG_ENDIAN) && defined(JRNL_32_BIT) + rd_cnt += sizeof(u_int32_t); // Filler 0 +#endif + _txn_hdr._xidsize = *(std::size_t*)((char*)rptr + rd_cnt); + rd_cnt = _txn_hdr.size(); + chk_hdr(); + _buff = std::malloc(_txn_hdr._xidsize); + MALLOC_CHK(_buff, "_buff", "txn_rec", "decode"); + const u_int32_t hdr_xid_dblks = size_dblks(txn_hdr::size() + _txn_hdr._xidsize); + const u_int32_t hdr_xid_tail_dblks = size_dblks(txn_hdr::size() + _txn_hdr._xidsize + + rec_tail::size()); + + // Check if record (header + xid + tail) fits within this page, we can check the + // tail before the expense of copying data to memory + if (hdr_xid_tail_dblks <= max_size_dblks) + { + // Entire header, xid and tail fits within this page + std::memcpy(_buff, (char*)rptr + rd_cnt, _txn_hdr._xidsize); + rd_cnt += _txn_hdr._xidsize; + std::memcpy((void*)&_txn_tail, (char*)rptr + rd_cnt, sizeof(_txn_tail)); + rd_cnt += sizeof(_txn_tail); + chk_tail(); + } + else if (hdr_xid_dblks <= max_size_dblks) + { + // Entire header and xid fit within this page, tail split + std::memcpy(_buff, (char*)rptr + rd_cnt, _txn_hdr._xidsize); + rd_cnt += _txn_hdr._xidsize; + const std::size_t tail_rem = (max_size_dblks * JRNL_DBLK_SIZE) - rd_cnt; + if (tail_rem) + { + std::memcpy((void*)&_txn_tail, (char*)rptr + rd_cnt, tail_rem); + rd_cnt += tail_rem; + } + } + else + { + // Header fits within this page, xid split + const std::size_t xid_cp_size = (max_size_dblks * JRNL_DBLK_SIZE) - rd_cnt; + std::memcpy(_buff, (char*)rptr + rd_cnt, xid_cp_size); + rd_cnt += xid_cp_size; + } + } + return size_dblks(rd_cnt); +} + +bool +txn_rec::rcv_decode(rec_hdr h, std::ifstream* ifsp, std::size_t& rec_offs) +{ + if (rec_offs == 0) + { + // Read header, allocate for xid + _txn_hdr.hdr_copy(h); +#if defined(JRNL_BIG_ENDIAN) && defined(JRNL_32_BIT) + ifsp->ignore(sizeof(u_int32_t)); // _filler0 +#endif + ifsp->read((char*)&_txn_hdr._xidsize, sizeof(std::size_t)); +#if defined(JRNL_LITTLE_ENDIAN) && defined(JRNL_32_BIT) + ifsp->ignore(sizeof(u_int32_t)); // _filler0 +#endif + rec_offs = sizeof(_txn_hdr); + _buff = std::malloc(_txn_hdr._xidsize); + MALLOC_CHK(_buff, "_buff", "txn_rec", "rcv_decode"); + } + if (rec_offs < sizeof(_txn_hdr) + _txn_hdr._xidsize) + { + // Read xid (or continue reading xid) + std::size_t offs = rec_offs - sizeof(_txn_hdr); + ifsp->read((char*)_buff + offs, _txn_hdr._xidsize - offs); + std::size_t size_read = ifsp->gcount(); + rec_offs += size_read; + if (size_read < _txn_hdr._xidsize - offs) + { + assert(ifsp->eof()); + // As we may have read past eof, turn off fail bit + ifsp->clear(ifsp->rdstate()&(~std::ifstream::failbit)); + assert(!ifsp->fail() && !ifsp->bad()); + return false; + } + } + if (rec_offs < sizeof(_txn_hdr) + _txn_hdr._xidsize + sizeof(rec_tail)) + { + // Read tail (or continue reading tail) + std::size_t offs = rec_offs - sizeof(_txn_hdr) - _txn_hdr._xidsize; + ifsp->read((char*)&_txn_tail + offs, sizeof(rec_tail) - offs); + std::size_t size_read = ifsp->gcount(); + rec_offs += size_read; + if (size_read < sizeof(rec_tail) - offs) + { + assert(ifsp->eof()); + // As we may have read past eof, turn off fail bit + ifsp->clear(ifsp->rdstate()&(~std::ifstream::failbit)); + assert(!ifsp->fail() && !ifsp->bad()); + return false; + } + } + ifsp->ignore(rec_size_dblks() * JRNL_DBLK_SIZE - rec_size()); + chk_tail(); // Throws if tail invalid or record incomplete + assert(!ifsp->fail() && !ifsp->bad()); + return true; +} + +std::size_t +txn_rec::get_xid(void** const xidpp) +{ + if (!_buff) + { + *xidpp = 0; + return 0; + } + *xidpp = _buff; + return _txn_hdr._xidsize; +} + +std::string& +txn_rec::str(std::string& str) const +{ + std::ostringstream oss; + if (_txn_hdr._magic == RHM_JDAT_TXA_MAGIC) + oss << "dtxa_rec: m=" << _txn_hdr._magic; + else + oss << "dtxc_rec: m=" << _txn_hdr._magic; + oss << " v=" << (int)_txn_hdr._version; + oss << " rid=" << _txn_hdr._rid; + oss << " xid=\"" << _xidp << "\""; + str.append(oss.str()); + return str; +} + +std::size_t +txn_rec::xid_size() const +{ + return _txn_hdr._xidsize; +} + +std::size_t +txn_rec::rec_size() const +{ + return txn_hdr::size() + _txn_hdr._xidsize + rec_tail::size(); +} + +void +txn_rec::chk_hdr() const +{ + jrec::chk_hdr(_txn_hdr); + if (_txn_hdr._magic != RHM_JDAT_TXA_MAGIC && _txn_hdr._magic != RHM_JDAT_TXC_MAGIC) + { + std::ostringstream oss; + oss << std::hex << std::setfill('0'); + oss << "dtx magic: rid=0x" << std::setw(16) << _txn_hdr._rid; + oss << ": expected=(0x" << std::setw(8) << RHM_JDAT_TXA_MAGIC; + oss << " or 0x" << RHM_JDAT_TXC_MAGIC; + oss << ") read=0x" << std::setw(2) << (int)_txn_hdr._magic; + throw jexception(jerrno::JERR_JREC_BADRECHDR, oss.str(), "txn_rec", "chk_hdr"); + } +} + +void +txn_rec::chk_hdr(u_int64_t rid) const +{ + chk_hdr(); + jrec::chk_rid(_txn_hdr, rid); +} + +void +txn_rec::chk_tail() const +{ + jrec::chk_tail(_txn_tail, _txn_hdr); +} + +void +txn_rec::clean() +{ + // clean up allocated memory here +} + +} // namespace journal +} // namespace mrg |