chromium/third_party/blink/renderer/modules/indexeddb/idb_request_loader.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 THIRD_PARTY_BLINK_RENDERER_MODULES_INDEXEDDB_IDB_REQUEST_LOADER_H_
#define THIRD_PARTY_BLINK_RENDERER_MODULES_INDEXEDDB_IDB_REQUEST_LOADER_H_

#include <cstdint>
#include <memory>

#include "base/dcheck_is_on.h"
#include "base/functional/callback.h"
#include "base/memory/raw_ref.h"
#include "third_party/blink/renderer/core/fileapi/file_reader_client.h"
#include "third_party/blink/renderer/core/fileapi/file_reader_loader.h"
#include "third_party/blink/renderer/platform/heap/garbage_collected.h"
#include "third_party/blink/renderer/platform/heap/member.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"

namespace blink {

class IDBValue;

// Loads IndexedDB values that have been wrapped in Blobs by IDBValueWrapper.
//
// An IDBRequestLoader unwraps the result of a single IDBRequest. While most
// IndexedDB requests result in a single value, getAll() in IDBObjectStore and
// IDBIndex results in an array of values. In the interest of simplicity,
// IDBRequestLoader only knows how to unwrap an array of values, even though
// most of the time the array will consist of a single element. This design
// assumes that the overhead of creating and destroying a Vector is much smaller
// than the IPC overhead required to load the Blob data into the renderer.
class IDBRequestLoader : public GarbageCollected<IDBRequestLoader>,
                         public FileReaderClient { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_MODULES_INDEXEDDB_IDB_REQUEST_LOADER_H_