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107 lines
2.6 KiB
C++
107 lines
2.6 KiB
C++
// cursors.h
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/*
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* Copyright (C) 2010 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 "../pch.h"
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#include "../db/jsobj.h"
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#include "../db/dbmessage.h"
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#include "../client/dbclient.h"
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#include "../client/parallel.h"
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#include "request.h"
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namespace mongo {
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class ShardedClientCursor : boost::noncopyable {
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public:
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ShardedClientCursor( QueryMessage& q , ClusteredCursor * cursor );
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virtual ~ShardedClientCursor();
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long long getId();
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/**
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* @return whether there is more data left
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*/
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bool sendNextBatch( Request& r ) { return sendNextBatch( r , _ntoreturn ); }
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bool sendNextBatch( Request& r , int ntoreturn );
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void accessed();
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/** @return idle time in ms */
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long long idleTime( long long now );
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protected:
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ClusteredCursor * _cursor;
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int _skip;
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int _ntoreturn;
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int _totalSent;
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bool _done;
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long long _id;
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long long _lastAccessMillis; // 0 means no timeout
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};
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typedef boost::shared_ptr<ShardedClientCursor> ShardedClientCursorPtr;
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class CursorCache {
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public:
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static long long TIMEOUT;
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typedef map<long long,ShardedClientCursorPtr> MapSharded;
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typedef map<long long,string> MapNormal;
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CursorCache();
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~CursorCache();
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ShardedClientCursorPtr get( long long id ) const;
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void store( ShardedClientCursorPtr cursor );
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void remove( long long id );
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void storeRef( const string& server , long long id );
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/** @return the server for id or "" */
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string getRef( long long id ) const ;
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void gotKillCursors(Message& m );
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void appendInfo( BSONObjBuilder& result ) const ;
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long long genId();
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void doTimeouts();
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void startTimeoutThread();
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private:
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mutable mongo::mutex _mutex;
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MapSharded _cursors;
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MapNormal _refs;
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long long _shardedTotal;
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static int _myLogLevel;
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};
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extern CursorCache cursorCache;
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}
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