mirror of https://gitee.com/bigwinds/arangodb
135 lines
4.7 KiB
C++
135 lines
4.7 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief Write-ahead log logfile
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///
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/// @file
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///
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/// DISCLAIMER
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///
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/// Copyright 2004-2013 triAGENS GmbH, Cologne, Germany
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///
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/// Licensed under the Apache License, Version 2.0 (the "License");
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/// you may not use this file except in compliance with the License.
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/// You may obtain a copy of the License at
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///
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/// http://www.apache.org/licenses/LICENSE-2.0
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///
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/// Unless required by applicable law or agreed to in writing, software
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/// distributed under the License is distributed on an "AS IS" BASIS,
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/// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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/// See the License for the specific language governing permissions and
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/// limitations under the License.
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///
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/// Copyright holder is triAGENS GmbH, Cologne, Germany
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///
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/// @author Jan Steemann
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef TRIAGENS_WAL_LOGFILE_H
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#define TRIAGENS_WAL_LOGFILE_H 1
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#include "Basics/Common.h"
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#include "VocBase/datafile.h"
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namespace triagens {
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namespace wal {
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// -----------------------------------------------------------------------------
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// --SECTION-- class Logfile
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// -----------------------------------------------------------------------------
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class Logfile {
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// -----------------------------------------------------------------------------
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// --SECTION-- typedefs
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// -----------------------------------------------------------------------------
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief typedef for logfile ids
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////////////////////////////////////////////////////////////////////////////////
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typedef TRI_voc_fid_t IdType;
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors and destructors
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief Logfile
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////////////////////////////////////////////////////////////////////////////////
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Logfile (Logfile const&);
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Logfile& operator= (Logfile const&);
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public:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief create a logfile
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////////////////////////////////////////////////////////////////////////////////
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Logfile (TRI_datafile_t*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief destroy a logfile
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////////////////////////////////////////////////////////////////////////////////
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~Logfile ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the allocated size of the logfile
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////////////////////////////////////////////////////////////////////////////////
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uint64_t allocatedSize () const {
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return static_cast<uint64_t>(_df->_maximalSize);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief return the size of the free space in the logfile
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////////////////////////////////////////////////////////////////////////////////
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uint64_t freeSize () const {
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if (_df->_isSealed) {
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return 0;
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}
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return static_cast<uint64_t>(allocatedSize() - _df->_footerSize);
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}
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////////////////////////////////////////////////////////////////////////////////
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/// @brief whether or not the logfile is sealed
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////////////////////////////////////////////////////////////////////////////////
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bool isSealed () const {
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return _df->_isSealed;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- public variables
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// -----------------------------------------------------------------------------
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the datafile entry
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////////////////////////////////////////////////////////////////////////////////
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TRI_datafile_t* _df;
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};
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}
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}
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#endif
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @addtogroup\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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