/**
 * \file src/client.h
 * MegRay is Licensed under the Apache License, Version 2.0 (the "License")
 *
 * Copyright (c) 2014-2020 Megvii Inc. All rights reserved.
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT ARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */

#pragma once

#include <mutex>

#include "common.h"

namespace MegRay {

/*!
 * synchronize meta information with megray server
 */
class Client {
    public:
        Client(uint32_t nranks, uint32_t rank);

        ~Client();

        Status connect(const char* master_ip, int port);

        // block until all ranks reach this barrier
        Status barrier();

        // the length of sendbuff = the length of recvbuff = len
        Status broadcast(const void* sendbuff, void* recvbuff, size_t sendlen, uint32_t root);

        // the length of sendbuff = sendlen
        // the length of recvbuff = sendlen * m_nranks
        Status allgather(const void* sendbuff, void* recvbuff, size_t sendlen);

    private:
        uint32_t m_nranks;
        uint32_t m_rank;
        bool m_connected = false;
        int m_conn;
        std::mutex m_mutex;
};

} // namespace MegRay