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// d_logic.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/>.
*/
#pragma once
#include "../pch.h"
#include "../db/jsobj.h"
namespace mongo {
typedef unsigned long long ConfigVersion;
typedef map<string,ConfigVersion> NSVersionMap;
// --------------
// --- global state ---
// --------------
class ShardingState {
public:
ShardingState();
bool enabled() const { return _enabled; }
const string& getConfigServer() const { return _configServer; }
void enable( const string& server );
bool hasVersion( const string& ns ) const;
bool hasVersion( const string& ns , ConfigVersion& version ) const;
ConfigVersion& getVersion( const string& ns ); // TODO: this is dangeroues
void setVersion( const string& ns , const ConfigVersion& version );
private:
bool _enabled;
string _configServer;
NSVersionMap _versions;
};
extern ShardingState shardingState;
// --------------
// --- per connection ---
// --------------
class ShardedConnectionInfo {
public:
ShardedConnectionInfo();
const OID& getID() const { return _id; }
bool hasID() const { return _id.isSet(); }
void setID( const OID& id );
ConfigVersion& getVersion( const string& ns ); // TODO: this is dangeroues
void setVersion( const string& ns , const ConfigVersion& version );
static ShardedConnectionInfo* get( bool create );
private:
OID _id;
NSVersionMap _versions;
static boost::thread_specific_ptr<ShardedConnectionInfo> _tl;
};
// -----------------
// --- core ---
// -----------------
unsigned long long extractVersion( BSONElement e , string& errmsg );
/**
* @return true if we have any shard info for the ns
*/
bool haveLocalShardingInfo( const string& ns );
/**
* @return true if the current threads shard version is ok, or not in sharded version
*/
bool shardVersionOk( const string& ns , string& errmsg );
/**
* @return true if we took care of the message and nothing else should be done
*/
bool handlePossibleShardedMessage( Message &m, DbResponse &dbresponse );
// -----------------
// --- writeback ---
// -----------------
/* queue a write back on a remote server for a failed write */
void queueWriteBack( const string& remote , const BSONObj& o );
}
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