/*
 * Copyright (c) Huawei Technologies Co., Ltd. 2025. All rights reserved.
 * You can use this software according to the terms and conditions of the Mulan PSL v2.
 * You may obtain a copy of Mulan PSL v2 at:
 *          http://license.coscl.org.cn/MulanPSL2
 * THIS SOFTWARE IS PROVIDED ON AN "AS IS" BASIS, WITHOUT WARRANTIES OF ANY KIND,
 * EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO NON-INFRINGEMENT,
 * MERCHANTABILITY OR FIT FOR A PARTICULAR PURPOSE.
 * See the Mulan PSL v2 for more details.
 */
#ifndef OMNISTREAM_WAITINGFORFIRSTBARRIER_H
#define OMNISTREAM_WAITINGFORFIRSTBARRIER_H


#include "runtime/io/checkpointing/BarrierHandlerState.h"
#include "runtime/io/checkpointing/ChannelState.h"

/**
 * Aligned-only checkpoint barrier handler state.
 *
 * In aligned mode, once a barrier is received on an input channel we (optionally)
 * block that channel until barriers from all input channels arrive. only after
 * all barriers are received we trigger the checkpoint, then unblock all channels.
 */

class WaitingForFirstBarrier : public BarrierHandlerState {

public:

    explicit WaitingForFirstBarrier(ChannelState state);

    BarrierHandlerState* BarrierReceived(
        Controller* controller,
        InputChannelInfo channelInfo,
        CheckpointBarrier* barrier,
        bool markChannelBlocked) override;

    BarrierHandlerState* AlignedCheckpointTimeout(
        Controller* controller,
        CheckpointBarrier* barrier) override;

    BarrierHandlerState* FinishCheckpoint() override;

private:
    ChannelState state_;

};


#endif // OMNISTREAM_WAITINGFORFIRSTBARRIER_H