d_chunk_manager.h

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// @file d_chunk_manager.h

#pragma once

#include "../pch.h"

#include "../db/jsobj.h"
#include "util.h"

namespace mongo {

    class ShardChunkManager : public boost::noncopyable {
    public:

        ShardChunkManager( const string& configServer , const string& ns , const string& shardName );

        ShardChunkManager( const BSONObj& collectionDoc , const BSONArray& chunksDoc );

        ~ShardChunkManager() {}

        ShardChunkManager* cloneMinus( const BSONObj& min , const BSONObj& max , const ShardChunkVersion& version );

        ShardChunkManager* clonePlus( const BSONObj& min , const BSONObj& max , const ShardChunkVersion& version );

        ShardChunkManager* cloneSplit( const BSONObj& min , const BSONObj& max , const vector<BSONObj>& splitKeys ,
                                       const ShardChunkVersion& version );

        bool belongsToMe( const BSONObj& obj ) const;

        bool getNextChunk( const BSONObj& lookupKey, BSONObj* foundMin , BSONObj* foundMax ) const;

        // accessors

        ShardChunkVersion getVersion() const { return _version; }
        BSONObj getKey() const { return _key.getOwned(); }
        unsigned getNumChunks() const { return _chunksMap.size(); }

        string toString() const;
    private:
        // highest ShardChunkVersion for which this ShardChunkManager's information is accurate
        ShardChunkVersion _version;

        // key pattern for chunks under this range
        BSONObj _key;

        // a map from a min key into the chunk's (or range's) max boundary
        typedef map< BSONObj, BSONObj , BSONObjCmp > RangeMap;
        RangeMap _chunksMap;

        // a map from a min key into a range or continguous chunks
        // redundant but we expect high chunk continguity, expecially in small installations
        RangeMap _rangesMap;

        void _fillCollectionKey( const BSONObj& collectionDoc );
        void _fillChunks( DBClientCursorInterface* cursor );
        void _fillRanges();

        void _assertChunkExists( const BSONObj& min , const BSONObj& max ) const;

        ShardChunkManager() {}
    };

    typedef shared_ptr<ShardChunkManager> ShardChunkManagerPtr;

}  // namespace mongo

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mongodb
Author(s): Nate Koenig
autogenerated on Fri Jan 11 12:15:18 2013