mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-12-04 21:42:39 +00:00
43 lines
1.5 KiB
C++
43 lines
1.5 KiB
C++
#pragma once
|
|
#include <memory>
|
|
|
|
namespace DB
|
|
{
|
|
|
|
class Context;
|
|
|
|
class MergeTreeTransaction;
|
|
/// TODO maybe replace with raw pointer? It should not be shared, only MergeTreeTransactionHolder can own a transaction object
|
|
using MergeTreeTransactionPtr = std::shared_ptr<MergeTreeTransaction>;
|
|
|
|
/// Owns a MergeTreeTransactionObject.
|
|
/// Rolls back a transaction in dtor if it was not committed.
|
|
/// If `autocommit` flag is true, then it commits transaction if dtor is called normally
|
|
/// or rolls it back if dtor was called due to an exception.
|
|
class MergeTreeTransactionHolder
|
|
{
|
|
public:
|
|
MergeTreeTransactionHolder() = default;
|
|
MergeTreeTransactionHolder(const MergeTreeTransactionPtr & txn_, bool autocommit_, const Context * owned_by_session_context_ = nullptr);
|
|
MergeTreeTransactionHolder(MergeTreeTransactionHolder && rhs) noexcept;
|
|
MergeTreeTransactionHolder & operator=(MergeTreeTransactionHolder && rhs) noexcept;
|
|
~MergeTreeTransactionHolder();
|
|
|
|
/// NOTE: We cannot make it noncopyable, because we use it as a field of Context.
|
|
/// So the following copy constructor and operator does not copy anything,
|
|
/// they just leave txn nullptr.
|
|
MergeTreeTransactionHolder(const MergeTreeTransactionHolder & rhs);
|
|
MergeTreeTransactionHolder & operator=(const MergeTreeTransactionHolder & rhs);
|
|
|
|
MergeTreeTransactionPtr getTransaction() const { return txn; }
|
|
|
|
private:
|
|
void onDestroy() noexcept;
|
|
|
|
MergeTreeTransactionPtr txn;
|
|
bool autocommit = false;
|
|
const Context * owned_by_session_context = nullptr;
|
|
};
|
|
|
|
}
|