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// grid.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/>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the GNU Affero General Public License in all respects
* for all of the code used other than as permitted herein. If you modify
* file(s) with this exception, you may extend this exception to your
* version of the file(s), but you are not obligated to do so. If you do not
* wish to do so, delete this exception statement from your version. If you
* delete this exception statement from all source files in the program,
* then also delete it in the license file.
*/
#pragma once
#include <boost/date_time/posix_time/posix_time.hpp>
#include <boost/scoped_ptr.hpp>
#include <boost/shared_ptr.hpp>
#include <string>
#include <vector>
#include "mongo/s/config.h"
namespace mongo {
class CatalogCache;
class CatalogManager;
class DBConfig;
class SettingsType;
template<typename T> class StatusWith;
/**
* Holds the global sharding context. Single instance exists for a running server. Exists on
* both MongoD and MongoS.
*/
class Grid {
public:
Grid();
/**
* Called at startup time so the catalog manager can be set.
*
* Returns whether the catalog manager has been initialized successfully. Must be called
* only once.
*/
bool initCatalogManager(const std::vector<std::string>& configHosts);
/**
* Implicitly creates the specified database as non-sharded.
*/
StatusWith<boost::shared_ptr<DBConfig>> implicitCreateDb(const std::string& dbName);
/**
* @return true if shards and config servers are allowed to use 'localhost' in address
*/
bool allowLocalHost() const;
/**
* @param whether to allow shards and config servers to use 'localhost' in address
*/
void setAllowLocalHost( bool allow );
/**
* @return true if the config database knows about a host 'name'
*/
bool knowAboutShard( const std::string& name ) const;
/**
* Returns true if the balancer should be running. Caller is responsible
* for making sure settings has the balancer key.
*/
bool shouldBalance(const SettingsType& balancerSettings) const;
/**
* Retrieve the balancer settings from the config server. Returns false if an error
* occurred while retrieving the document. If the balancer settings document does not
* exist, it is not considered as an error, but the "key" property of the settings
* output parameter will not be set.
*/
bool getBalancerSettings(SettingsType* settings, std::string* errMsg) const;
/**
* Returns true if the config server settings indicate that the balancer should be active.
*/
bool getConfigShouldBalance() const;
/**
* Returns true if the given collection can be balanced based on the config.collections
* document.
*/
bool getCollShouldBalance(const std::string& ns) const;
CatalogManager* catalogManager() const { return _catalogManager.get(); }
CatalogCache* catalogCache() const { return _catalogCache.get(); }
/**
*
* Obtain grid configuration and settings data.
*
* @param name identifies a particular type of configuration data.
* @return a BSON object containing the requested data.
*/
BSONObj getConfigSetting( const std::string& name ) const;
// exposed methods below are for testing only
/**
* @param balancerDoc bson that may contain a window of time for the balancer to work
* format { ... , activeWindow: { start: "8:30" , stop: "19:00" } , ... }
* @return true if there is no window of time specified for the balancer or it we're currently in it
*/
static bool _inBalancingWindow( const BSONObj& balancerDoc , const boost::posix_time::ptime& now );
private:
boost::scoped_ptr<CatalogManager> _catalogManager;
boost::scoped_ptr<CatalogCache> _catalogCache;
// can 'localhost' be used in shard addresses?
bool _allowLocalShard;
};
extern Grid grid;
} // namespace mongo
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