ClickHouse/src/Storages/MergeTree/ZeroCopyLock.h

#pragma once
#include <Core/Types.h>
#include <optional>
#include <memory>
#include <Common/ZooKeeper/ZooKeeperLock.h>
#include <Common/ZooKeeper/ZooKeeper.h>

namespace DB
{

/// Very simple wrapper for zookeeper ephemeral lock. It's better to have it
/// because due to bad abstraction we use it in MergeTreeData.
struct ZeroCopyLock
{
    static inline const auto ZERO_COPY_LOCK_NAME = "part_exclusive_lock";

    ZeroCopyLock(const zkutil::ZooKeeperPtr & zookeeper, const std::string & lock_path, const std::string & lock_message);

    bool isLocked() const { return lock->isLocked(); }
    /// Actual lock
    std::unique_ptr<zkutil::ZooKeeperLock> lock;
};

}