chromium/content/browser/indexed_db/indexed_db_tombstone_sweeper.h

// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TOMBSTONE_SWEEPER_H_
#define CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TOMBSTONE_SWEEPER_H_

#include <map>
#include <memory>
#include <optional>
#include <vector>

#include "base/feature_list.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "content/browser/indexed_db/indexed_db_leveldb_coding.h"
#include "content/browser/indexed_db/indexed_db_pre_close_task_queue.h"
#include "content/common/content_export.h"
#include "third_party/leveldatabase/src/include/leveldb/status.h"
#include "third_party/leveldatabase/src/include/leveldb/write_batch.h"

namespace blink {
struct IndexedDBDatabaseMetadata;
struct IndexedDBIndexMetadata;
struct IndexedDBObjectStoreMetadata;
}  // namespace blink

namespace leveldb {
class DB;
class Iterator;
}  // namespace leveldb

namespace content {
class IndexedDBBackingStore;

namespace indexed_db_tombstone_sweeper_unittest {
class IndexedDBTombstoneSweeperTest;
}

// Facilitates iterating a whole container with an abnormal starting position.
// If the starting position is not 0, then the iteration will wrap to the
// beginning of the container until the starting position is reached again.
template <typename T>
class WrappingIterator { … };

// Sweeps the IndexedDB leveldb database looking for index tombstones. These
// occur when the indexed fields of rows are modified, and stay around if script
// doesn't do a cursor iteration of the database.
//
// Owned by the IndexedDBBackingStore.
//
// TODO(dmurph) Describe this class in a README.md file.
// See bit.ly/idb-tombstone-sweeper for more information.
class CONTENT_EXPORT IndexedDBTombstoneSweeper
    : public IndexedDBPreCloseTaskQueue::PreCloseTask { … };

}  // namespace content
#endif  // CONTENT_BROWSER_INDEXED_DB_INDEXED_DB_TOMBSTONE_SWEEPER_H_