1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
// extsort.h
/**
* 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/>.
*/
#pragma once
#include "../stdafx.h"
#include "jsobj.h"
#include "namespace.h"
#include "curop.h"
#include "../util/array.h"
namespace mongo {
/**
for sorting by BSONObj and attaching a value
*/
class BSONObjExternalSorter : boost::noncopyable {
public:
typedef pair<BSONObj,DiskLoc> Data;
private:
static BSONObj extSortOrder;
static int extSortComp( const void *lv, const void *rv ){
RARELY killCurrentOp.checkForInterrupt();
_compares++;
Data * l = (Data*)lv;
Data * r = (Data*)rv;
int cmp = l->first.woCompare( r->first , extSortOrder );
if ( cmp )
return cmp;
return l->second.compare( r->second );
};
class FileIterator : boost::noncopyable {
public:
FileIterator( string file );
~FileIterator();
bool more();
Data next();
private:
MemoryMappedFile _file;
char * _buf;
char * _end;
};
class MyCmp {
public:
MyCmp( const BSONObj & order = BSONObj() ) : _order( order ){}
bool operator()( const Data &l, const Data &r ) const {
RARELY killCurrentOp.checkForInterrupt();
_compares++;
int x = l.first.woCompare( r.first , _order );
if ( x )
return x < 0;
return l.second.compare( r.second ) < 0;
};
private:
BSONObj _order;
};
public:
typedef FastArray<Data> InMemory;
class Iterator : boost::noncopyable {
public:
Iterator( BSONObjExternalSorter * sorter );
~Iterator();
bool more();
Data next();
private:
MyCmp _cmp;
vector<FileIterator*> _files;
vector< pair<Data,bool> > _stash;
InMemory * _in;
InMemory::iterator _it;
};
BSONObjExternalSorter( const BSONObj & order = BSONObj() , long maxFileSize = 1024 * 1024 * 100 );
~BSONObjExternalSorter();
void add( const BSONObj& o , const DiskLoc & loc );
void add( const BSONObj& o , int a , int b ){
add( o , DiskLoc( a , b ) );
}
/* call after adding values, and before fetching the iterator */
void sort();
auto_ptr<Iterator> iterator(){
uassert( 10052 , "not sorted" , _sorted );
return auto_ptr<Iterator>( new Iterator( this ) );
}
int numFiles(){
return _files.size();
}
long getCurSizeSoFar(){ return _curSizeSoFar; }
void hintNumObjects( long long numObjects ){
if ( numObjects < _arraySize )
_arraySize = (int)(numObjects + 100);
}
private:
void _sortInMem();
void sort( string file );
void finishMap();
BSONObj _order;
long _maxFilesize;
path _root;
int _arraySize;
InMemory * _cur;
long _curSizeSoFar;
list<string> _files;
bool _sorted;
static unsigned long long _compares;
};
}
|
