// Licensed to the Apache Software Foundation (ASF) under one

// or more contributor license agreements.  See the NOTICE file

// distributed with this work for additional information

// regarding copyright ownership.  The ASF licenses this file

// to you under the Apache License, Version 2.0 (the

// "License"); you may not use this file except in compliance

// with the License.  You may obtain a copy of the License at

//

//   http://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing,

// software distributed under the License is distributed on an

// "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY

// KIND, either express or implied.  See the License for the

// specific language governing permissions and limitations

// under the License.

#pragma once

#include <gen_cpp/Types_types.h>

#include <gen_cpp/internal_service.pb.h>

#include <gen_cpp/types.pb.h>

#include <atomic>

#include <cstdint>

#include <memory>

#include <mutex>

#include <random>

#include <vector>

#include "common/status.h"

#include "core/custom_allocator.h"

#include "load/delta_writer/delta_writer_context.h"

#include "load/memtable/memtable.h"

#include "storage/partial_update_info.h"

#include "storage/tablet/tablet.h"

#include "storage/tablet/tablet_schema.h"

namespace doris {

class FlushToken;

class MemTable;

class StorageEngine;

class TupleDescriptor;

class SlotDescriptor;

class OlapTableSchemaParam;

class RowsetWriter;

struct FlushStatistic;

class WorkloadGroup;

class Block;

// Writer for a particular (load, index, tablet).

// This class is NOT thread-safe, external synchronization is required.

class MemTableWriter {

public:

    MemTableWriter(const WriteRequest& req);

    ~MemTableWriter();

    Status init(std::shared_ptr<RowsetWriter> rowset_writer, TabletSchemaSPtr tablet_schema,

                std::shared_ptr<PartialUpdateInfo> partial_update_info,

                std::shared_ptr<WorkloadGroup> wg_sptr, bool unique_key_mow = false);

    Status write(const Block* block, const DorisVector<uint32_t>& row_idxs);

    // flush the last memtable to flush queue, must call it before close_wait()

    Status close();

    // wait for all memtables to be flushed, update profiles if provided.

    // mem_consumption() should be 0 after this function returns.

    Status close_wait(RuntimeProfile* profile = nullptr) {

        RETURN_IF_ERROR(_do_close_wait());

        if (profile != nullptr) {

            _update_profile(profile);

        }

        return Status::OK();

    }

    // abandon current memtable and wait for all pending-flushing memtables to be destructed.

    // mem_consumption() should be 0 after this function returns.

    Status cancel();

    Status cancel_with_status(const Status& st);

    int64_t mem_consumption(MemType mem);

    int64_t active_memtable_mem_consumption();

    // Submit current memtable to flush queue, and return without waiting.

    // This is currently for reducing mem consumption of this memtable writer.

    Status flush_async();

    // Wait all memtable in flush queue to be flushed

    Status wait_flush();

    int64_t tablet_id() const { return _req.tablet_id; }

    int64_t total_received_rows() const { return _total_received_rows; }

    const FlushStatistic& get_flush_token_stats();

    uint64_t flush_running_count() const;

    uint64_t workload_group_id() const {

        auto wg = _resource_ctx->workload_group();

        if (wg != nullptr) {

            return wg->id();

        }

        return 0;

    }

private:

    Status _flush_memtable();

    // push a full memtable to flush executor

    Status _flush_memtable_async();

    void _reset_mem_table();

    Status _do_close_wait();

    void _update_profile(RuntimeProfile* profile);

    std::atomic<bool> _is_init = false;

    bool _is_cancelled = false;

    bool _is_closed = false;

    Status _cancel_status;

    WriteRequest _req;

    std::shared_ptr<RowsetWriter> _rowset_writer;

    std::shared_ptr<MemTable> _mem_table;

    TabletSchemaSPtr _tablet_schema;

    bool _unique_key_mow = false;

    // This variable is accessed from writer thread and token flush thread

    // use a shared ptr to avoid use after free problem.

    std::shared_ptr<FlushToken> _flush_token;

    // Save the not active memtable that is in flush queue or under flushing.

    std::vector<std::weak_ptr<MemTable>> _freezed_mem_tables;

    // The lock to protect _memtable and _freezed_mem_tables structure to avoid concurrency modification or read

    std::mutex _mem_table_ptr_lock;

    std::shared_ptr<ResourceContext> _resource_ctx;

    std::mutex _lock;

    // total rows num written by MemTableWriter

    std::atomic<int64_t> _total_received_rows = 0;

    int64_t _wait_flush_time_ns = 0;

    int64_t _close_wait_time_ns = 0;

    int64_t _segment_num = 0;

    MonotonicStopWatch _lock_watch;

    std::shared_ptr<PartialUpdateInfo> _partial_update_info;

};

} // namespace doris