parsec/runtime_locking_shard/state_machine.hpp

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// Copyright (c) 2021 MIT Digital Currency Initiative,
//                    Federal Reserve Bank of Boston
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
#ifndef OPENCBDC_TX_SRC_PARSEC_RUNTIME_LOCKING_SHARD_STATE_MACHINE_H_
#define OPENCBDC_TX_SRC_PARSEC_RUNTIME_LOCKING_SHARD_STATE_MACHINE_H_
 
#include "messages.hpp"
#include "replicated_shard.hpp"
#include "util/common/logging.hpp"
 
#include <libnuraft/nuraft.hxx>
 
namespace cbdc::parsec::runtime_locking_shard {
    class state_machine : public nuraft::state_machine {
      public:
        auto commit(uint64_t log_idx, nuraft::buffer& data)
            -> nuraft::ptr<nuraft::buffer> override;
 
        auto apply_snapshot(nuraft::snapshot& /* s */) -> bool override;
 
        auto last_snapshot() -> nuraft::ptr<nuraft::snapshot> override;
 
        auto last_commit_index() -> uint64_t override;
 
        void create_snapshot(
            nuraft::snapshot& /* s */,
            nuraft::async_result<bool>::handler_type& /* when_done */)
            override;
 
        [[nodiscard]] auto get_shard() const
            -> std::shared_ptr<replicated_shard>;
 
      private:
        auto process_request(const rpc::replicated_request& req)
            -> rpc::replicated_response;
 
        std::atomic<uint64_t> m_last_committed_idx{0};
 
        std::shared_ptr<replicated_shard> m_shard{
            std::make_shared<replicated_shard>()};
    };
}
 
#endif