67 lines
2.0 KiB
C++
67 lines
2.0 KiB
C++
// shardkey.h
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/**
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* Copyright (C) 2008 10gen Inc.
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License, version 3,
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* as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#pragma once
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#include "../client/dbclient.h"
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namespace mongo {
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class Shard;
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/**
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NOTE: the implementation for this is tempoary.
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it only currently works for a single numeric field
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*/
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class ShardKey {
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public:
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ShardKey( BSONObj fieldsAndOrder = emptyObj );
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void init( BSONObj fieldsAndOrder );
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virtual ~ShardKey() {}
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void globalMin( BSONObjBuilder & b );
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BSONObj globalMin(){ BSONObjBuilder b; globalMin( b ); return b.obj(); }
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void globalMax( BSONObjBuilder & b );
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BSONObj globalMax(){ BSONObjBuilder b; globalMax( b ); return b.obj(); }
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void middle( BSONObjBuilder & b , BSONObj & min , BSONObj & max );
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BSONObj middle( BSONObj & min , BSONObj & max ){ BSONObjBuilder b; middle( b , min , max ); return b.obj(); }
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int compare( const BSONObj& l , const BSONObj& r ) const;
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bool hasShardKey( const BSONObj& obj );
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void getFilter( BSONObjBuilder& b , const BSONObj& min, const BSONObj& max );
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bool relevantForQuery( const BSONObj& query , Shard * shard );
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BSONObj& key(){
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return _fieldsAndOrder;
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}
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virtual string toString() const;
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private:
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void _init();
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BSONObj _fieldsAndOrder;
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string _fieldName;
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};
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}
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