mirror of https://gitee.com/bigwinds/arangodb
178 lines
6.2 KiB
C++
178 lines
6.2 KiB
C++
////////////////////////////////////////////////////////////////////////////////
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/// @brief primary index
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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 2014 ArangoDB GmbH, Cologne, Germany
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/// Copyright 2004-2014 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 ArangoDB GmbH, Cologne, Germany
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///
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/// @author Dr. Frank Celler
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/// @author Copyright 2014, ArangoDB GmbH, Cologne, Germany
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/// @author Copyright 2011-2013, triAGENS GmbH, Cologne, Germany
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////////////////////////////////////////////////////////////////////////////////
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#ifndef ARANGODB_INDEXES_PRIMARY_INDEX_H
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#define ARANGODB_INDEXES_PRIMARY_INDEX_H 1
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#include "Basics/Common.h"
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#include "Indexes/Index.h"
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#include "VocBase/vocbase.h"
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#include "VocBase/voc-types.h"
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// -----------------------------------------------------------------------------
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// --SECTION-- class PrimaryIndex
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// -----------------------------------------------------------------------------
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namespace triagens {
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namespace arango {
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class PrimaryIndex : public Index {
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// -----------------------------------------------------------------------------
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// --SECTION-- constructors / destructors
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// -----------------------------------------------------------------------------
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public:
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PrimaryIndex () = delete;
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explicit PrimaryIndex (struct TRI_document_collection_t*);
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~PrimaryIndex ();
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// -----------------------------------------------------------------------------
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// --SECTION-- public types
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// -----------------------------------------------------------------------------
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public:
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struct PrimaryIndexType {
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uint64_t _nrAlloc; // the size of the table
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uint64_t _nrUsed; // the number of used entries
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void** _table; // the table itself
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};
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// -----------------------------------------------------------------------------
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// --SECTION-- public methods
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// -----------------------------------------------------------------------------
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public:
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IndexType type () const override final {
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return Index::TRI_IDX_TYPE_PRIMARY_INDEX;
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}
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bool hasSelectivityEstimate () const override final {
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return true;
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}
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double selectivityEstimate () const override final {
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return 1.0;
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}
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bool dumpFields () const override final {
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return true;
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}
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size_t memory () const override final;
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triagens::basics::Json toJson (TRI_memory_zone_t*, bool) const override final;
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triagens::basics::Json toJsonFigures (TRI_memory_zone_t*) const override final;
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int insert (struct TRI_doc_mptr_t const*, bool) override final;
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int remove (struct TRI_doc_mptr_t const*, bool) override final;
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void* lookupKey (char const*) const;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief looks up an element given a key
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/// returns the index position into which a key would belong in the second
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/// parameter. sets position to UINT64_MAX if the position cannot be determined
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////////////////////////////////////////////////////////////////////////////////
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void* lookupKey (char const*, uint64_t&) const;
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int insertKey (struct TRI_doc_mptr_t const*, void const**);
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void insertKey (struct TRI_doc_mptr_t const*);
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////////////////////////////////////////////////////////////////////////////////
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/// @brief adds a key/element to the index
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/// this is a special, optimized version that receives the target slot index
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/// from a previous lookupKey call
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////////////////////////////////////////////////////////////////////////////////
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void insertKey (struct TRI_doc_mptr_t const*, uint64_t);
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void* removeKey (char const*);
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int resize (size_t);
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int resize ();
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static uint64_t calculateHash (char const*);
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static uint64_t calculateHash (char const*, size_t);
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PrimaryIndexType* internals () {
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return &_primaryIndex;
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}
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// -----------------------------------------------------------------------------
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// --SECTION-- private methods
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// -----------------------------------------------------------------------------
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private:
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bool shouldResize () const;
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bool resize (uint64_t, bool);
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// -----------------------------------------------------------------------------
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// --SECTION-- private variables
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// -----------------------------------------------------------------------------
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private:
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////////////////////////////////////////////////////////////////////////////////
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/// @brief the actual index
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////////////////////////////////////////////////////////////////////////////////
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PrimaryIndexType _primaryIndex;
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////////////////////////////////////////////////////////////////////////////////
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/// @brief associative array of pointers
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////////////////////////////////////////////////////////////////////////////////
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static uint64_t const InitialSize;
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};
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}
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}
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#endif
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// -----------------------------------------------------------------------------
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// --SECTION-- END-OF-FILE
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// -----------------------------------------------------------------------------
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// Local Variables:
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// mode: outline-minor
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// outline-regexp: "/// @brief\\|/// {@inheritDoc}\\|/// @page\\|// --SECTION--\\|/// @\\}"
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// End:
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