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// shard.h
/*
A "shard" is a database (replica pair typically) which represents
one partition of the overall database.
*/
/**
* 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 "../client/dbclient.h"
#include "../client/model.h"
#include "shardkey.h"
#include <boost/utility.hpp>
namespace mongo {
class DBConfig;
class ShardManager;
class ShardObjUnitTest;
typedef unsigned long long ServerShardVersion;
/**
config.shard
{ ns : "alleyinsider.fs.chunks" , min : {} , max : {} , server : "localhost:30001" }
*/
class Shard : public Model , boost::noncopyable {
public:
Shard( ShardManager * info );
BSONObj& getMin(){
return _min;
}
BSONObj& getMax(){
return _max;
}
string getServer(){
return _server;
}
void setServer( string server );
bool contains( const BSONObj& obj );
string toString() const;
operator string() const { return toString(); }
bool operator==(const Shard& s);
bool operator!=(const Shard& s){
return ! ( *this == s );
}
void getFilter( BSONObjBuilder& b );
BSONObj pickSplitPoint();
Shard * split();
Shard * split( const BSONObj& middle );
bool moveAndCommit( const string& to , string& errmsg );
virtual const char * getNS(){ return "config.shard"; }
virtual void serialize(BSONObjBuilder& to);
virtual void unserialize(const BSONObj& from);
virtual string modelServer();
virtual void save( bool check=false );
void ensureIndex();
void _markModified();
private:
ShardManager * _manager;
string _ns;
BSONObj _min;
BSONObj _max;
string _server;
ServerShardVersion _lastmod;
bool _modified;
void _split( BSONObj& middle );
friend class ShardManager;
friend class ShardObjUnitTest;
};
/* config.sharding
{ ns: 'alleyinsider.fs.chunks' ,
key: { ts : 1 } ,
shards: [ { min: 1, max: 100, server: a } , { min: 101, max: 200 , server : b } ]
}
*/
class ShardManager {
public:
ShardManager( DBConfig * config , string ns ,ShardKeyPattern pattern );
virtual ~ShardManager();
string getns(){
return _ns;
}
int numShards(){ return _shards.size(); }
bool hasShardKey( const BSONObj& obj );
Shard& findShard( const BSONObj& obj );
Shard* findShardOnServer( const string& server ) const;
ShardKeyPattern& getShardKey(){ return _key; }
/**
* makes sure the shard index is on all servers
*/
void ensureIndex();
/**
* @return number of shards added to the vector
*/
int getShardsForQuery( vector<Shard*>& shards , const BSONObj& query );
void save();
string toString() const;
operator string() const { return toString(); }
ServerShardVersion getVersion( const string& server ) const;
ServerShardVersion getVersion() const;
/**
* this is just an increasing number of how many shard managers we have so we know if something has been updated
*/
unsigned long long getSequenceNumber(){
return _sequenceNumber;
}
private:
DBConfig * _config;
string _ns;
ShardKeyPattern _key;
vector<Shard*> _shards;
unsigned long long _sequenceNumber;
friend class Shard;
static unsigned long long NextSequenceNumber;
};
} // namespace mongo
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