chromium/chrome/browser/extensions/activity_log/database_string_table.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_DATABASE_STRING_TABLE_H_
#define CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_DATABASE_STRING_TABLE_H_

#include <stdint.h>

#include <map>
#include <string>

#include "base/gtest_prod_util.h"

namespace sql {
class Database;
}  // namespace sql

namespace extensions {

// A class for maintaining a persistent mapping between strings and integers.
// This is used to help compress the contents of the activity log database on
// disk by replacing repeated strings by smaller integers.
//
// The mapping from integers to strings is maintained in a database table, but
// the mapping is also cached in memory.
//
// The database table used to store the strings is configurable, but its layout
// is fixed: it always consists of just two columns, "id" and "value".
//
// All calls to DatabaseStringTable must occur on the database thread.
class DatabaseStringTable { … };

}  // namespace extensions

#endif  // CHROME_BROWSER_EXTENSIONS_ACTIVITY_LOG_DATABASE_STRING_TABLE_H_