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// cursors.h
/*
* Copyright (C) 2010 10gen Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#pragma once
#include "../pch.h"
#include "../db/jsobj.h"
#include "../db/dbmessage.h"
#include "../client/dbclient.h"
#include "../client/parallel.h"
#include "request.h"
namespace mongo {
class ShardedClientCursor : boost::noncopyable {
public:
ShardedClientCursor( QueryMessage& q , ClusteredCursor * cursor );
virtual ~ShardedClientCursor();
long long getId();
/**
* @return whether there is more data left
*/
bool sendNextBatch( Request& r ) { return sendNextBatch( r , _ntoreturn ); }
bool sendNextBatch( Request& r , int ntoreturn );
void accessed();
/** @return idle time in ms */
long long idleTime( long long now );
protected:
ClusteredCursor * _cursor;
int _skip;
int _ntoreturn;
int _totalSent;
bool _done;
long long _id;
long long _lastAccessMillis; // 0 means no timeout
};
typedef boost::shared_ptr<ShardedClientCursor> ShardedClientCursorPtr;
class CursorCache {
public:
static long long TIMEOUT;
typedef map<long long,ShardedClientCursorPtr> MapSharded;
typedef map<long long,string> MapNormal;
CursorCache();
~CursorCache();
ShardedClientCursorPtr get( long long id ) const;
void store( ShardedClientCursorPtr cursor );
void remove( long long id );
void storeRef( const string& server , long long id );
/** @return the server for id or "" */
string getRef( long long id ) const ;
void gotKillCursors(Message& m );
void appendInfo( BSONObjBuilder& result ) const ;
long long genId();
void doTimeouts();
void startTimeoutThread();
private:
mutable mongo::mutex _mutex;
MapSharded _cursors;
MapNormal _refs;
long long _shardedTotal;
static int _myLogLevel;
};
extern CursorCache cursorCache;
}
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