/* Copyright (C) 2014 InfiniDB, Inc.

   This program is free software; you can redistribute it and/or
   modify it under the terms of the GNU General Public License
   as published by the Free Software Foundation; version 2 of
   the License.

   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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
   MA 02110-1301, USA. */

/***********************************************************************
 *   $Id$
 *
 *
 ***********************************************************************/
/** @file */

#include "batchprimitiveprocessor.h"
#include "umsocketselector.h"
#include <queue>
#include <set>
#include <boost/thread/thread.hpp>
#include <boost/thread/condition.hpp>

#ifndef BPPSENDTHREAD_H
#define BPPSENDTHREAD_H

namespace primitiveprocessor
{

class BPPSendThread
{

public:
    BPPSendThread();   // starts unthrottled
    BPPSendThread(uint32_t initMsgsLeft);   // starts throttled
    virtual ~BPPSendThread();

    struct Msg_t
    {
        messageqcpp::SBS msg;
        SP_UM_IOSOCK sock;
        SP_UM_MUTEX sockLock;
        int sockIndex;			// Socket index for round robin control. Bug 4475
        Msg_t() : sockIndex(0) { }
        Msg_t(const Msg_t& m) : msg(m.msg), sock(m.sock), sockLock(m.sockLock), sockIndex(m.sockIndex) { }
        Msg_t& operator=(const Msg_t& m)
        {
            msg = m.msg;
            sock = m.sock;
            sockLock = m.sockLock;
            sockIndex = m.sockIndex;
            return *this;
        }
        Msg_t(const messageqcpp::SBS& m, const SP_UM_IOSOCK& so, const SP_UM_MUTEX& sl, int si) :
            msg(m), sock(so), sockLock(sl), sockIndex(si) { }
    };

    bool okToProceed();
    void sendMore(int num);
    void sendResults(const std::vector<Msg_t>& msgs, bool newConnection);
    void sendResult(const Msg_t& msg, bool newConnection);
    void mainLoop();
    bool flowControlEnabled();
    void abort();
    inline bool aborted() const
    {
        return die;
    }

private:
    BPPSendThread(const BPPSendThread&);
    BPPSendThread& operator=(const BPPSendThread&);

    struct Runner_t
    {
        BPPSendThread* bppst;
        Runner_t(BPPSendThread* b) : bppst(b) { }
        void operator()()
        {
            bppst->mainLoop();
        }
    };

    boost::thread runner;
    std::queue<Msg_t> msgQueue;
    boost::mutex msgQueueLock;
    boost::condition queueNotEmpty;
    volatile bool die, gotException, mainThreadWaiting;
    std::string exceptionString;
    uint32_t sizeThreshold;
    volatile int32_t msgsLeft;
    bool waiting;
    boost::mutex ackLock;
    boost::condition okToSend;

    /* Load balancing structures */
    struct Connection_t
    {
        Connection_t(const SP_UM_MUTEX& lock, const SP_UM_IOSOCK& so) :
            sockLock(lock), sock(so) { }
        SP_UM_MUTEX sockLock;
        SP_UM_IOSOCK sock;
        bool operator<(const Connection_t& t) const
        {
            return sockLock.get() < t.sockLock.get();
        }
        bool operator==(const Connection_t& t) const
        {
            return sockLock.get() == t.sockLock.get();
        }
    };
    std::set<Connection_t> connections_s;
    std::vector<Connection_t> connections_v;
    bool sawAllConnections;
    volatile bool fcEnabled;

    /* secondary queue size restriction based on byte size */
    volatile uint64_t currentByteSize;
    uint64_t maxByteSize;
};

}

#endif