mirror of
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150 lines
4.2 KiB
C++
150 lines
4.2 KiB
C++
// config.h
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/**
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* Copyright (C) 2008 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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/* This file is things related to the "grid configuration":
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- what machines make up the db component of our cloud
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- where various ranges of things live
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*/
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#pragma once
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#include "../db/namespace.h"
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#include "../client/dbclient.h"
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#include "../client/model.h"
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#include "shardkey.h"
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namespace mongo {
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class Grid;
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class ConfigServer;
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extern ConfigServer configServer;
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extern Grid grid;
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class ShardManager;
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/**
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top level grid configuration for an entire database
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*/
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class DBConfig : public Model {
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public:
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DBConfig( string name = "" ) : _name( name ) , _primary("") , _partitioned(false){ }
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string getName(){ return _name; };
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/**
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* @return if anything in this db is partitioned or not
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*/
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bool isPartitioned(){
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return _partitioned;
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}
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void turnOnPartitioning();
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ShardManager* turnOnSharding( const string& ns , ShardKeyPattern fieldsAndOrder );
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/**
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* @return whether or not this partition is partitioned
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*/
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bool sharded( const string& ns );
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ShardManager* getShardManager( const string& ns , bool reload = false );
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/**
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* @return the correct for machine for the ns
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* if the namespace is partitioned, will return an empty string
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*/
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string getServer( const string& ns );
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string getPrimary(){
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if ( _primary.size() == 0 )
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throw UserException( (string)"no primary server configured for db: " + _name );
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return _primary;
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}
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void setPrimary( string s ){
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_primary = s;
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}
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virtual void save( bool check=true);
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virtual string modelServer();
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// model stuff
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virtual const char * getNS(){ return "config.databases"; }
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virtual void serialize(BSONObjBuilder& to);
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virtual void unserialize(const BSONObj& from);
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bool loadByName(const char *nm);
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protected:
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string _name; // e.g. "alleyinsider"
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string _primary; // e.g. localhost , mongo.foo.com:9999
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bool _partitioned;
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map<string,ShardKeyPattern> _sharded; // { "alleyinsider.blog.posts" : { ts : 1 } , ... ] - all ns that are sharded
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map<string,ShardManager*> _shards; // this will only have entries for things that have been looked at
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friend class Grid;
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};
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class Grid {
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public:
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/**
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gets the config the db.
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will return an empty DBConfig if not in db already
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*/
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DBConfig * getDBConfig( string ns , bool create=true);
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string pickServerForNewDB();
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bool knowAboutServer( string name ) const;
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unsigned long long getNextOpTime() const;
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private:
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map<string,DBConfig*> _databases;
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};
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class ConfigServer : public DBConfig {
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public:
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enum { Port = 27016 }; /* standard port # for a grid db */
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ConfigServer();
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~ConfigServer();
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bool ok(){
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// TODO: check can connect
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return _primary.size() > 0;
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}
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virtual string modelServer(){
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uassert( "ConfigServer not setup" , _primary.size() );
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return _primary;
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}
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/**
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call at startup, this will initiate connection to the grid db
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*/
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bool init( vector<string> configHosts , bool infer );
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private:
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string getHost( string name , bool withPort );
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};
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} // namespace mongo
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