ClickHouse/dbms/include/DB/Storages/MergeTree/MergeList.h

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#pragma once
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#include <DB/Common/Stopwatch.h>
#include <DB/Common/CurrentMetrics.h>
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#include <memory>
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#include <list>
#include <mutex>
#include <atomic>
namespace DB
{
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struct MergeInfo
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{
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const std::string database;
const std::string table;
const std::string result_part_name;
Stopwatch watch;
Float64 progress{};
std::uint64_t num_parts{};
std::uint64_t total_size_bytes_compressed{};
std::uint64_t total_size_marks{};
std::uint64_t bytes_read_uncompressed{};
std::uint64_t rows_read{};
std::uint64_t bytes_written_uncompressed{};
std::uint64_t rows_written{};
MergeInfo(const std::string & database, const std::string & table, const std::string & result_part_name)
: database{database}, table{table}, result_part_name{result_part_name}
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{
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}
};
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class MergeList;
class MergeListEntry
{
MergeList & list;
using container_t = std::list<MergeInfo>;
container_t::iterator it;
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CurrentMetrics::Increment num_merges {CurrentMetrics::Merge};
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public:
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MergeListEntry(const MergeListEntry &) = delete;
MergeListEntry & operator=(const MergeListEntry &) = delete;
MergeListEntry(MergeList & list, const container_t::iterator it) : list(list), it{it} {}
~MergeListEntry();
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MergeInfo * operator->() { return &*it; }
};
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class MergeList
{
friend class MergeListEntry;
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using container_t = std::list<MergeInfo>;
mutable std::mutex mutex;
container_t merges;
public:
using Entry = MergeListEntry;
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using EntryPtr = std::unique_ptr<Entry>;
template <typename... Args>
EntryPtr insert(Args &&... args)
{
std::lock_guard<std::mutex> lock{mutex};
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return std::make_unique<Entry>(*this, merges.emplace(merges.end(), std::forward<Args>(args)...));
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}
container_t get() const
{
std::lock_guard<std::mutex> lock{mutex};
return merges;
}
};
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inline MergeListEntry::~MergeListEntry()
{
std::lock_guard<std::mutex> lock{list.mutex};
list.merges.erase(it);
}
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}