mirror of
https://github.com/mongodb/mongo.git
synced 2024-11-30 00:56:44 +01:00
87 lines
2.5 KiB
C++
87 lines
2.5 KiB
C++
/**
|
|
* Copyright (C) 2008 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/>.
|
|
*/
|
|
|
|
/* clientcursor.h
|
|
|
|
Cursor -- and its derived classes -- are our internal cursors.
|
|
|
|
ClientCursor is a wrapper that represents a cursorid from our database
|
|
application's perspective.
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include "../stdafx.h"
|
|
|
|
typedef long long CursorId;
|
|
class Cursor;
|
|
class ClientCursor;
|
|
typedef map<CursorId, ClientCursor*> CCById;
|
|
extern CCById clientCursorsById;
|
|
|
|
class ClientCursor {
|
|
friend class CursInspector;
|
|
DiskLoc _lastLoc; // use getter and setter not this.
|
|
static CursorId allocCursorId();
|
|
public:
|
|
ClientCursor() : cursorid( allocCursorId() ), pos(0) {
|
|
clientCursorsById.insert( make_pair(cursorid, this) );
|
|
}
|
|
~ClientCursor();
|
|
const CursorId cursorid;
|
|
string ns;
|
|
//BSONObj pattern; // the query object
|
|
auto_ptr<JSMatcher> matcher;
|
|
auto_ptr<Cursor> c;
|
|
int pos;
|
|
DiskLoc lastLoc() const { return _lastLoc; }
|
|
void setLastLoc(DiskLoc);
|
|
auto_ptr< set<string> > filter; // which fields query wants returned
|
|
Message originalMessage; // this is effectively an auto ptr for data the matcher points to.
|
|
|
|
/* Get rid of cursors for namespaces that begin with nsprefix.
|
|
Used by drop, deleteIndexes, dropDatabase.
|
|
*/
|
|
static void invalidate(const char *nsPrefix);
|
|
|
|
static bool erase(CursorId id) {
|
|
ClientCursor *cc = find(id);
|
|
if( cc ) {
|
|
delete cc;
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
static ClientCursor* find(CursorId id, bool warn = true) {
|
|
CCById::iterator it = clientCursorsById.find(id);
|
|
if( it == clientCursorsById.end() ) {
|
|
if( warn )
|
|
OCCASIONALLY cout << "ClientCursor::find(): cursor not found in map " << id << " (ok after a drop)\n";
|
|
return 0;
|
|
}
|
|
return it->second;
|
|
}
|
|
|
|
/* call when cursor's location changes so that we can update the
|
|
cursorsbylocation map. if you are locked and internally iterating, only
|
|
need to call when you are ready to "unlock".
|
|
*/
|
|
void updateLocation();
|
|
|
|
void cleanupByLocation(DiskLoc loc);
|
|
};
|