mongodb/s/request.h

// request.h

#pragma once

#include "../stdafx.h"
#include "../util/message.h"
#include "../db/dbmessage.h"
#include "config.h"

namespace mongo {
    
    class ClientInfo;
    
    class Request : boost::noncopyable {
    public:
        Request( Message& m, AbstractMessagingPort* p );

        // ---- message info -----


        const char * getns(){
            return _d.getns();
        }
        int op(){
            return _m.data->operation();
        }
        bool expectResponse(){
            return op() == dbQuery || op() == dbGetMore;
        }
        
        MSGID id(){
            return _id;
        }

        DBConfig * getConfig(){
            return _config;
        }
        bool isShardingEnabled(){
            return _config->isShardingEnabled();
        }
        
        ChunkManager * getChunkManager(){
            return _chunkManager;
        }
        
        int getClientId(){
            return _clientId;
        }
        ClientInfo * getClientInfo(){
            return _clientInfo;
        }

        // ---- remote location info -----

        
        string singleServerName();
        
        const char * primaryName(){
            return _config->getPrimary().c_str();
        }

        // ---- low level access ----

        void reply( Message & response ){
            _p->reply( _m , response , _id );
        }
        
        Message& m(){ return _m; }
        DbMessage& d(){ return _d; }
        AbstractMessagingPort* p(){ return _p; }

        void process( int attempt = 0 );
        
    private:
        
        void reset( bool reload=false );
        
        Message& _m;
        DbMessage _d;
        AbstractMessagingPort* _p;
        
        MSGID _id;
        DBConfig * _config;
        ChunkManager * _chunkManager;
        
        int _clientId;
        ClientInfo * _clientInfo;
    };
    
    class StaleConfigException : public std::exception {
    public:
        StaleConfigException( const string& ns , const string& msg){
            stringstream s;
            s << "StaleConfigException ns: " << ns << " " << msg;
            _msg = s.str();
        }

        virtual ~StaleConfigException() throw(){}
        
        virtual const char* what() const throw(){
            return _msg.c_str();
        }
    private:
        string _msg;
    };

    typedef map<int,ClientInfo*> ClientCache;
    
    class ClientInfo {
    public:
        ClientInfo( int clientId );
        ~ClientInfo();
        
        void addShard( const string& shard );
        set<string> * getPrev() const { return _prev; };
        
        void newRequest();
        void disconnect();

        static ClientInfo * get( int clientId = 0 , bool create = true );
        
    private:
        int _id;
        set<string> _a;
        set<string> _b;
        set<string> * _cur;
        set<string> * _prev;
        int _lastAccess;
        
        static boost::mutex _clientsLock;
        static ClientCache _clients;
        static boost::thread_specific_ptr<ClientInfo> _tlInfo;
    };
}

#include "strategy.h"