stasis-bLSM/logserver.h

#ifndef _LOGSERVER_H_
#define _LOGSERVER_H_


#include <queue>
#include <vector>

//#include "logstore.h"

#include "datatuple.h"



#include <stasis/transactional.h>
#include <pthread.h>

#undef begin
#undef try
#undef end

#define STATS_ENABLED 1

#ifdef STATS_ENABLED
#include <sys/time.h>
#include <time.h>
#include <map>
#endif

class logtable;



struct pthread_item;

struct pthread_data {
    std::queue<pthread_item> *idleth_queue;
    std::queue<int> *ready_queue;
    std::queue<int> *work_queue;
    pthread_mutex_t * qlock;

    pthread_cond_t *selcond;
    
    pthread_cond_t * th_cond;
    pthread_mutex_t * th_mut;
    
    int *workitem; //id of the socket to work

    //pthread_mutex_t * table_lock;
    //rwl *table_lock;
    logtable *ltable;
    bool *sys_alive;

    #ifdef STATS_ENABLED
    int num_reqs;
    struct timeval start_tv, stop_tv;
    double work_time;
    std::map<std::string, int> num_reqsc;
    std::map<std::string, double> work_timec;
    #endif
    
};

struct pthread_item{
    pthread_t * th_handle;
    pthread_data *data;
};


//struct work_item
//{
//    int sockd; //socket id
//    datatuple in_tuple; //request
//    datatuple out_tuple; //response
//};

struct serverth_data
{
    int *server_socket;
    int server_port;
    std::queue<pthread_item> *idleth_queue;
    std::queue<int> *ready_queue;

    pthread_cond_t *selcond;
    
    pthread_mutex_t *qlock;
    
    

};

void * thread_work_fn( void *);    

class logserver
{
public:
    //server codes
    static uint8_t OP_SUCCESS;
    static uint8_t OP_FAIL;
    static uint8_t OP_SENDING_TUPLE;

    //client codes
    static uint8_t OP_FIND;
    static uint8_t OP_INSERT;

    static uint8_t OP_DONE;
    
    static uint8_t OP_INVALID;
    
public:
    logserver(int nthreads, int server_port){
        this->nthreads = nthreads;
        this->server_port = server_port;
        //lsmlock = new pthread_mutex_t;
        //pthread_mutex_init(lsmlock,0);

        //lsmlock = initlock();

        qlock = new pthread_mutex_t;
        pthread_mutex_init(qlock,0);

        ltable = 0;

        #ifdef STATS_ENABLED        
        num_selevents = 0;
        num_selcalls = 0;
        #endif


    }

    ~logserver()
        {
            //delete lsmlock;
            //deletelock(lsmlock);
            delete qlock;
        }
    
    void startserver(logtable *ltable);

    void stopserver();
    
    
public:

    // XXX utility methods, pull out into some other class.

    static inline void readfromsocket(int sockd, byte *buf, int count)
    {

        int n = 0;
        while( n < count )
        {
            n += read( sockd, buf + n, count - n);
        }

    }

    static inline void writetosocket(int sockd, byte *buf, int count)
    {
        int n = 0;
        while( n < count )
        {
            n += write( sockd, buf + n, count - n);
        }
    }


private:

    //main loop of server
    //accept connections, assign jobs to threads
    //void dispatchLoop();

    void eventLoop();
    

private:

    int server_port;
    
    size_t nthreads;

    bool sys_alive;
    
    int serversocket; //server socket file descriptor

    //ccqueue<int> conn_queue; //list of active connections (socket list)

    //ccqueue<pthread_item> idleth_queue; //list of idle threads

    std::queue<int> ready_queue; //connections to go inside select
    std::queue<int> work_queue;  //connections to be processed by worker threads
    std::queue<pthread_item> idleth_queue;
    pthread_mutex_t *qlock;

    pthread_t server_thread;
    serverth_data *sdata;
    pthread_cond_t *selcond; //server loop cond
    
    std::vector<pthread_item *> th_list; // list of threads

    //rwl *lsmlock; //lock for using lsm table

    logtable *ltable;


    #ifdef STATS_ENABLED
    int num_reqs;
    int num_selevents;
    int num_selcalls;
    struct timeval start_tv, stop_tv;
    double tot_threadwork_time;
    double tot_time;
    #endif

    
};


#endif