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102 lines
2.3 KiB
C++
102 lines
2.3 KiB
C++
#pragma once
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#include <DB/Core/Defines.h>
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#include <DB/IO/ReadBuffer.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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namespace DB
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{
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/** Progress of query execution.
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* Values, transferred over network are deltas - how much was done after previously sent value.
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* The same struct is also used for summarized values.
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*/
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struct Progress
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{
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std::atomic<size_t> rows {0}; /// Rows (source) processed.
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std::atomic<size_t> bytes {0}; /// Bytes (uncompressed, source) processed.
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/** How much rows must be processed, in total, approximately. Non-zero value is sent when there is information about some new part of job.
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* Received values must be summed to get estimate of total rows to process.
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* Used for rendering progress bar on client.
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*/
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std::atomic<size_t> total_rows {0};
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Progress() {}
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Progress(size_t rows_, size_t bytes_, size_t total_rows_ = 0)
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: rows(rows_), bytes(bytes_), total_rows(total_rows_) {}
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void read(ReadBuffer & in, UInt64 server_revision)
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{
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size_t new_rows = 0;
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size_t new_bytes = 0;
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size_t new_total_rows = 0;
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readVarUInt(new_rows, in);
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readVarUInt(new_bytes, in);
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if (server_revision >= DBMS_MIN_REVISION_WITH_TOTAL_ROWS_IN_PROGRESS)
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readVarUInt(new_total_rows, in);
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rows = new_rows;
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bytes = new_bytes;
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total_rows = new_total_rows;
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}
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void write(WriteBuffer & out, UInt64 client_revision) const
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{
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writeVarUInt(rows, out);
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writeVarUInt(bytes, out);
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if (client_revision >= DBMS_MIN_REVISION_WITH_TOTAL_ROWS_IN_PROGRESS)
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writeVarUInt(total_rows, out);
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}
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/// Each value separately is changed atomically (but not whole object).
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void incrementPiecewiseAtomically(const Progress & rhs)
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{
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rows += rhs.rows;
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bytes += rhs.bytes;
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total_rows += rhs.total_rows;
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}
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void reset()
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{
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rows = 0;
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bytes = 0;
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total_rows = 0;
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}
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Progress fetchAndResetPiecewiseAtomically()
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{
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Progress res;
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res.rows = rows.fetch_and(0);
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res.bytes = bytes.fetch_and(0);
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res.total_rows = total_rows.fetch_and(0);
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return res;
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}
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Progress & operator=(Progress && other)
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{
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rows = other.rows.load(std::memory_order_relaxed);
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bytes = other.bytes.load(std::memory_order_relaxed);
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total_rows = other.total_rows.load(std::memory_order_relaxed);
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return *this;
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}
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Progress(Progress && other)
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{
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*this = std::move(other);
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}
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};
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}
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