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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed 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.
*/
#ifndef SRC_TRACE_PROCESSOR_SQLITE_SQL_STATS_TABLE_H_
#define SRC_TRACE_PROCESSOR_SQLITE_SQL_STATS_TABLE_H_
#include <limits>
#include <memory>
#include "src/trace_processor/sqlite/sqlite_table.h"
namespace perfetto {
namespace trace_processor {
class QueryConstraints;
class TraceStorage;
// A virtual table that allows to introspect performances of the SQL engine
// for the kMaxLogEntries queries.
class SqlStatsTable : public SqliteTable {
public:
enum Column {
kQuery = 0,
kTimeStarted = 1,
kTimeFirstNext = 2,
kTimeEnded = 3,
};
// Implementation of the SQLite cursor interface.
class Cursor : public SqliteTable::Cursor {
public:
Cursor(SqlStatsTable* storage);
~Cursor() override;
// Implementation of SqliteTable::Cursor.
int Filter(const QueryConstraints&,
sqlite3_value**,
FilterHistory) override;
int Next() override;
int Eof() override;
int Column(sqlite3_context*, int N) override;
private:
Cursor(Cursor&) = delete;
Cursor& operator=(const Cursor&) = delete;
Cursor(Cursor&&) noexcept = default;
Cursor& operator=(Cursor&&) = default;
size_t row_ = 0;
size_t num_rows_ = 0;
const TraceStorage* storage_ = nullptr;
SqlStatsTable* table_ = nullptr;
};
SqlStatsTable(sqlite3*, const TraceStorage* storage);
static void RegisterTable(sqlite3* db, const TraceStorage* storage);
// Table implementation.
base::Status Init(int, const char* const*, Schema*) override;
std::unique_ptr<SqliteTable::Cursor> CreateCursor() override;
int BestIndex(const QueryConstraints&, BestIndexInfo*) override;
private:
const TraceStorage* const storage_;
};
} // namespace trace_processor
} // namespace perfetto
#endif // SRC_TRACE_PROCESSOR_SQLITE_SQL_STATS_TABLE_H_
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